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        389 Contract API jobs in South East + 20 miles

        Software Engineer / Python / Rust

        Robert Half
        Oxfordshire
        Negotiable
        Software Engineer / API / Microservices / Outside IR35 Brilliant opportunity available for a Senior Software Engineer, with experience of coding APIs/web services has become available with a business based in Oxfordshire. The role can be largely remote with up to once a week office work in Didcot and ideally starting mid December - early Jan. We need experience of - - Python or Rust are the preferred languages - Coding APIs/web services - Microservices - Ideally experience with Devops/Kubernetes and Azure Interviews can be scheduled right away with a view of starting mid December - early Jan Apply via the link below or email me with your CV (joss. Escott @ Roberthalf. co. uk) Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions. Robert Half is committed to diversity, equity and inclusion.
        Software Engineer / API / Microservices / Outside IR35 Brilliant opportunity available for a Senior Software Engineer, with experience of coding APIs/web services has become available with a business based in Oxfordshire. The role can be largely remote with up to once a week office work in Didcot and ideally starting mid December - early Jan. We need experience of - - Python or Rust are the preferred languages - Coding APIs/web services - Microservices - Ideally experience with Devops/Kubernetes and Azure Interviews can be scheduled right away with a view of starting mid December - early Jan Apply via the link below or email me with your CV (joss. Escott @ Roberthalf. co. uk) Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions. Robert Half is committed to diversity, equity and inclusion.
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        Design and buildnext generation of high-scale SaaS platforms. We're looking for a senior/lead engineering consultant with deep expertise in GraphQL to take a leading role in developing our robust TypeScript/Node.js backend. You will be instrumental in shaping our technical direction, driving the evolution of our APIs, ensuring our services are resilient, scalable and secure within a cutting-edge, cloud-native environment (Helm, Kubernetes). The Deliverables * Design and buildsophisticated, scalable GraphQL APIs and backend services using TypeScript and Node.js. * Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Champion best practicein code quality, automated testing (Vitest, Playwright) and observability to deliver resilient, maintainable, and production-ready business logic.
        Design and buildnext generation of high-scale SaaS platforms. We're looking for a senior/lead engineering consultant with deep expertise in GraphQL to take a leading role in developing our robust TypeScript/Node.js backend. You will be instrumental in shaping our technical direction, driving the evolution of our APIs, ensuring our services are resilient, scalable and secure within a cutting-edge, cloud-native environment (Helm, Kubernetes). The Deliverables * Design and buildsophisticated, scalable GraphQL APIs and backend services using TypeScript and Node.js. * Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Champion best practicein code quality, automated testing (Vitest, Playwright) and observability to deliver resilient, maintainable, and production-ready business logic.
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        Cloud Solution Architect

        International Business Solutions Consulting Limited
        Soho, Central London (W1), W1D
        £500 per day
        Cloud Platform Engineering Lead My client, a large consultancy, is in need of a Cloud Platform Engineering Lead for a 6 month contract inside IR35 based in London offering 2 days per week remote but requiring 3 days per week on-site. The ideal candidate will have strong experience in delivering large-scale, fault-tolerant systems; setting SLOs/SLIs, Terraform and modern CI/CD tools (Azure DevOps, GitHub Actions, Harness, Jenkins, Spinnaker), Containers & orchestration (Kubernetes) and service mesh (eg, Istio), API design & security (REST/OpenAPI, mTLS, authN/Z), Scripting in Bash, PowerShell, or Python, Cloud Expertise (Depth in One, Ready to Cross-Train), Azure: ARM/Bicep, AKS, Application Gateway, API Management, Azure Storage, GCP: GKE, Cloud Load Balancing, Cloud Armor, Istio, Stackdriver, Jenkins, Apigee.
        Cloud Platform Engineering Lead My client, a large consultancy, is in need of a Cloud Platform Engineering Lead for a 6 month contract inside IR35 based in London offering 2 days per week remote but requiring 3 days per week on-site. The ideal candidate will have strong experience in delivering large-scale, fault-tolerant systems; setting SLOs/SLIs, Terraform and modern CI/CD tools (Azure DevOps, GitHub Actions, Harness, Jenkins, Spinnaker), Containers & orchestration (Kubernetes) and service mesh (eg, Istio), API design & security (REST/OpenAPI, mTLS, authN/Z), Scripting in Bash, PowerShell, or Python, Cloud Expertise (Depth in One, Ready to Cross-Train), Azure: ARM/Bicep, AKS, Application Gateway, API Management, Azure Storage, GCP: GKE, Cloud Load Balancing, Cloud Armor, Istio, Stackdriver, Jenkins, Apigee.
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        Full-Stack Software Developer

        Sanderson Government and Defence
        City of London (EC1), EC1
        Up to £520 per day
        Role: Software Developer Day Rate: £520p/d Inside IR35 Location: Central London (hybrid up to 2 days a week) Clearance required: ACTIVE SC & NPPV3 clearance. Duration: initial work package until March 2026 (scope for extension as a long-term programme) We're looking for an expert Full-Stack Java Engineer to join a high-profile, fast-moving government programme with a fixed deadline. You'll work in a large team building microservices, scalable APIs, optimised SQL, and fully containerised deployments on AWS. You'll also collaborate directly with senior stakeholders, turning complex problems into tested, working solutions. What You'll Do * Build and deploy backend services with Java & Spring Boot * Develop scalable APIs * Optimise SQL for large datasets * Work with DevOps on Docker and AWS deployments * Shape architecture and technical direction
        Role: Software Developer Day Rate: £520p/d Inside IR35 Location: Central London (hybrid up to 2 days a week) Clearance required: ACTIVE SC & NPPV3 clearance. Duration: initial work package until March 2026 (scope for extension as a long-term programme) We're looking for an expert Full-Stack Java Engineer to join a high-profile, fast-moving government programme with a fixed deadline. You'll work in a large team building microservices, scalable APIs, optimised SQL, and fully containerised deployments on AWS. You'll also collaborate directly with senior stakeholders, turning complex problems into tested, working solutions. What You'll Do * Build and deploy backend services with Java & Spring Boot * Develop scalable APIs * Optimise SQL for large datasets * Work with DevOps on Docker and AWS deployments * Shape architecture and technical direction
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        FEATURED
        Rate - £600 - 650 Inside IR35 Duration - 6 months Location - Canary Wharf - twice a week on site A client of ours is going through a major IT modernisation. The ongoing programmes of work include improvements to business processes, generating staff capacity creation, IT transformation and embedding agile delivery methodologies. A key strategic focus of the IT modernisation is to replace outdated technology and introduce new technology in the Treasury and Operations capability. * Work with their IT Architecture Team aligned to an IT Delivery Capability that delivers the transformation agenda and outcomes across multiple projects within the Treasury, Risk and Finance delivery capability. Participate in workshops, providing quality assurance and gathering requirements to shape project deliverables.
        Rate - £600 - 650 Inside IR35 Duration - 6 months Location - Canary Wharf - twice a week on site A client of ours is going through a major IT modernisation. The ongoing programmes of work include improvements to business processes, generating staff capacity creation, IT transformation and embedding agile delivery methodologies. A key strategic focus of the IT modernisation is to replace outdated technology and introduce new technology in the Treasury and Operations capability. * Work with their IT Architecture Team aligned to an IT Delivery Capability that delivers the transformation agenda and outcomes across multiple projects within the Treasury, Risk and Finance delivery capability. Participate in workshops, providing quality assurance and gathering requirements to shape project deliverables.
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        FEATURED
        10+ years in enterprise engineering, ideally in AI-driven environments. Expertise in a range of programming languages, tools, and technologies. Hands-on experience with cloud platforms (AWS preferred). Strong knowledge of API integration. Track record of delivering high-value products in large, complex organizations, ideally FTSE100 Group enterprises or similar Proven experience in developing, testing, and deploying data solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. Familiarity with airline or logistics data domains is a plus. Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value. Initial co-location with BA teams in London is essential to ensure close collaboration.
        10+ years in enterprise engineering, ideally in AI-driven environments. Expertise in a range of programming languages, tools, and technologies. Hands-on experience with cloud platforms (AWS preferred). Strong knowledge of API integration. Track record of delivering high-value products in large, complex organizations, ideally FTSE100 Group enterprises or similar Proven experience in developing, testing, and deploying data solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. Familiarity with airline or logistics data domains is a plus. Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value. Initial co-location with BA teams in London is essential to ensure close collaboration.
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        Front End Engineer

        InfinityQuest Ltd,
        Harmondsworth, West Drayton (UB7)
        Unspecified
        Required Skills & Experience * 10+ years in enterprise frontend engineering in AI/data environments. * Expertise in Tableau and/or PowerBI for rapid prototyping and stakeholder engagement * Deep hands-on experience with modern frontend frameworks (React, Typescript, etc) * Hands-on experience with cloud platforms (AWS preferred); familiarity with scalable deployment and integration * Strong knowledge of API integration. * Proven experience in developing, testing, and deploying robust frontend solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. * Familiarity with airline or logistics data domains is a plus. * Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value.
        Required Skills & Experience * 10+ years in enterprise frontend engineering in AI/data environments. * Expertise in Tableau and/or PowerBI for rapid prototyping and stakeholder engagement * Deep hands-on experience with modern frontend frameworks (React, Typescript, etc) * Hands-on experience with cloud platforms (AWS preferred); familiarity with scalable deployment and integration * Strong knowledge of API integration. * Proven experience in developing, testing, and deploying robust frontend solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. * Familiarity with airline or logistics data domains is a plus. * Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value.
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        Payment Architect

        Stackstudio Digital Ltd.
        Milton Keynes (MK1)
        Unspecified
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
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        A leading financial services client in London is seeking a talented AI Automation Engineer to join their team on a contract basis. Please see below for key details. Role Overview: Analyse and optimise business processes for automation whilst designing, building, and deploying intelligent automation solutions using BPA platforms (Appian), Machine Learning, and Generative AI to drive operational efficiency and innovation. 1. Process Analysis & Optimisation - Expert in analysing existing business processes through stakeholder interviews, process mapping, and workflow documentation to identify automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. 2.
        A leading financial services client in London is seeking a talented AI Automation Engineer to join their team on a contract basis. Please see below for key details. Role Overview: Analyse and optimise business processes for automation whilst designing, building, and deploying intelligent automation solutions using BPA platforms (Appian), Machine Learning, and Generative AI to drive operational efficiency and innovation. 1. Process Analysis & Optimisation - Expert in analysing existing business processes through stakeholder interviews, process mapping, and workflow documentation to identify automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. 2.
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        Greetings We are Hiring . Onsite: 3 days per week at Waterside office. Travel: EU travel (Barcelona/Madrid) approximately once in 3/4 weeks Contract 6 Months Role Purpose The Frontend Engineer will design and build enterprise-grade visualisations that deliver actionable insights at speed for British Airways initially, whilst ensuring frameworks can scale across all OpCos. This role demands consultancy-level frontend engineering expertise and the ability to balance velocity with strong engineering standards and discipline. Key Responsibilities Rapid prototyping: Deliver initial dashboards and visualisations in Tableau to meet urgent business needs Robust engineering: Architect and build production-grade, reusable dashboard solutions using modern frontend technologies, integrating with enterprise APIs and data sources
        Greetings We are Hiring . Onsite: 3 days per week at Waterside office. Travel: EU travel (Barcelona/Madrid) approximately once in 3/4 weeks Contract 6 Months Role Purpose The Frontend Engineer will design and build enterprise-grade visualisations that deliver actionable insights at speed for British Airways initially, whilst ensuring frameworks can scale across all OpCos. This role demands consultancy-level frontend engineering expertise and the ability to balance velocity with strong engineering standards and discipline. Key Responsibilities Rapid prototyping: Deliver initial dashboards and visualisations in Tableau to meet urgent business needs Robust engineering: Architect and build production-grade, reusable dashboard solutions using modern frontend technologies, integrating with enterprise APIs and data sources
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        Contract DevOps Engineers (x5) - SC Cleared Location: Remote (occasional London travel - max 1 day/week) Rate: Up to £475/day Duration: 6 months (likely extension) IR35: Inside Clearance: SC Cleared required Deadline for CV submission: Monday 15th We're looking for five experienced DevOps Engineers to join a major transformation project. These roles are AWS-heavy and require a solid development background. You don't need to be a superstar-just strong, reliable, and experienced in the right tech stack. Tech Stack * Cloud: AWS * Messaging: Kafka * Languages: Java, NodeJS * Frameworks: Spring Boot/Data, React * Containers: Docker, Kubernetes, Helm * Frontend: Typescript / JavaScript * Databases: Postgres * Search: OpenSearch / ElasticSearch * Testing: Playwright, Wiremock * Monitoring: Grafana, Prometheus, Dynatrace * Version Control: Git * APIs: REST API
        Contract DevOps Engineers (x5) - SC Cleared Location: Remote (occasional London travel - max 1 day/week) Rate: Up to £475/day Duration: 6 months (likely extension) IR35: Inside Clearance: SC Cleared required Deadline for CV submission: Monday 15th We're looking for five experienced DevOps Engineers to join a major transformation project. These roles are AWS-heavy and require a solid development background. You don't need to be a superstar-just strong, reliable, and experienced in the right tech stack. Tech Stack * Cloud: AWS * Messaging: Kafka * Languages: Java, NodeJS * Frameworks: Spring Boot/Data, React * Containers: Docker, Kubernetes, Helm * Frontend: Typescript / JavaScript * Databases: Postgres * Search: OpenSearch / ElasticSearch * Testing: Playwright, Wiremock * Monitoring: Grafana, Prometheus, Dynatrace * Version Control: Git * APIs: REST API
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        FEATURED

        Senior Java Software Engineer (Urgent)

        Morson Edge
        Tower Hill, City of London (EC3), E1W 1WY
        £500 - 600 per day
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
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        Python Engineer

        Bloc Recruitment
        The City, City of London (EC4), EC2R
        £475 per day
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
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        Role - .Net Engineer Location - Hybrid, Home and twice a month onsite (multiple locations) Contract - Initial 3 months, high probability of extension to 2027 Rate - £475 to £525 per day Start - ASAP This role has been deemed Inside IR35. You must hold active SC Clearance to be eligible for this role. The Opportunity We are working in partnership with a leading defence systems integrator to recruit a .Net Engineer for a major long-term programme of work. This is an exciting opportunity to join a highly capable engineering team delivering innovative software solutions across complex and mission-critical environments. If you’re looking to broaden your technical exposure; particularly across modern data platforms and integration technologies—this role offers the chance to grow within a dynamic, fast-moving setting where no two challenges are the same. The Role
        Role - .Net Engineer Location - Hybrid, Home and twice a month onsite (multiple locations) Contract - Initial 3 months, high probability of extension to 2027 Rate - £475 to £525 per day Start - ASAP This role has been deemed Inside IR35. You must hold active SC Clearance to be eligible for this role. The Opportunity We are working in partnership with a leading defence systems integrator to recruit a .Net Engineer for a major long-term programme of work. This is an exciting opportunity to join a highly capable engineering team delivering innovative software solutions across complex and mission-critical environments. If you’re looking to broaden your technical exposure; particularly across modern data platforms and integration technologies—this role offers the chance to grow within a dynamic, fast-moving setting where no two challenges are the same. The Role
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        Day Rate: Circa £500 per day (Outside IR35) Location: Hybrid/London Contract: Initial 3 month contract About the Role A major UK public sector organisation is seeking an experienced Technical Business Analyst to support a high-profile digital transformation programme delivering fixed outcomes to challenging timelines. This role is ideal for a detail-driven analyst with strong technical capability, excellent stakeholder management, and a passion for data-led problem-solving. Key Responsibilities * Gather, validate, and document detailed business and technical requirements * Translate business objectives into technical specifications aligned with fixed deliverables and fixed outcomes * Conduct in-depth analysis of existing systems, data flows, integrations, and processes * Work closely with engineering, product, architecture, and delivery teams to shape solution options
        Day Rate: Circa £500 per day (Outside IR35) Location: Hybrid/London Contract: Initial 3 month contract About the Role A major UK public sector organisation is seeking an experienced Technical Business Analyst to support a high-profile digital transformation programme delivering fixed outcomes to challenging timelines. This role is ideal for a detail-driven analyst with strong technical capability, excellent stakeholder management, and a passion for data-led problem-solving. Key Responsibilities * Gather, validate, and document detailed business and technical requirements * Translate business objectives into technical specifications aligned with fixed deliverables and fixed outcomes * Conduct in-depth analysis of existing systems, data flows, integrations, and processes * Work closely with engineering, product, architecture, and delivery teams to shape solution options
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        FEATURED

        Software Engineer (Hardware Integration with .NET)

        IO Associates
        City of London (EC1)
        £600 - £800 per day + Outside IR35 and Hybrid
        Role: Staff Software Engineer Sector: Life Sciences Location: London Days Onsite: 3 per week Day Rate: £800 Outside IR35 Duration: 4 Months then to extend or go Permanent iO Associates have partnered with Life Science Manufacturing company on their search for a Staff Software Engineer who has a strong background in integrating Medical Devices. This role will give you the opportunity to make a real impact in Healthcare and Life Sciences. Essential Requirements * Strong .NET / C# background * Significant experience integrating and communicating with hardware devices * Ability to handle Windows devices, drivers, and communication layers * 8+ years of experience at a staff-level, capable of working autonomously * Not a web-focused developer; needs to be fully hardware-integration oriented Beneficial Experience * gRPC, REST APIs, HTTP * Integrating devices in Life Sciences
        Role: Staff Software Engineer Sector: Life Sciences Location: London Days Onsite: 3 per week Day Rate: £800 Outside IR35 Duration: 4 Months then to extend or go Permanent iO Associates have partnered with Life Science Manufacturing company on their search for a Staff Software Engineer who has a strong background in integrating Medical Devices. This role will give you the opportunity to make a real impact in Healthcare and Life Sciences. Essential Requirements * Strong .NET / C# background * Significant experience integrating and communicating with hardware devices * Ability to handle Windows devices, drivers, and communication layers * 8+ years of experience at a staff-level, capable of working autonomously * Not a web-focused developer; needs to be fully hardware-integration oriented Beneficial Experience * gRPC, REST APIs, HTTP * Integrating devices in Life Sciences
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        FEATURED

        ServiceNow Architect

        Syntax Consultancy Limited
        Reading, Berkshire, RG1 1LZ
        500-525/day (Outside IR35)
        6 Month Contract Reading (Hybrid) £500-525/day (Outside IR35) Start ideally in Dec 2025 / Jan 2026. A chance to work with a global IT Consultancy on a ServiceNow design + integration project for an external client. Hybrid Working - 2 days/week working remotely (WFH) + 3 days/week working from the office in Reading. Paying up to £525/day (Outside IR35). * In-depth hands-on ServiceNow Architecture expertise including design, configuration + implementation. * Deep ServiceNow modules + workflows experience including: ITSM, ITOM, Discovery, ITAM, CSM, HRSD, SecOps, GRC). * Managing integrations between ServiceNow and other systems (via REST, SOAP APIs, IntegrationHub, MID Server, custom integrations), ensuring reliability, security, latency, error handling, monitoring. * Defining + implementing technical governance, architecture operating models, and instance strategy.
        6 Month Contract Reading (Hybrid) £500-525/day (Outside IR35) Start ideally in Dec 2025 / Jan 2026. A chance to work with a global IT Consultancy on a ServiceNow design + integration project for an external client. Hybrid Working - 2 days/week working remotely (WFH) + 3 days/week working from the office in Reading. Paying up to £525/day (Outside IR35). * In-depth hands-on ServiceNow Architecture expertise including design, configuration + implementation. * Deep ServiceNow modules + workflows experience including: ITSM, ITOM, Discovery, ITAM, CSM, HRSD, SecOps, GRC). * Managing integrations between ServiceNow and other systems (via REST, SOAP APIs, IntegrationHub, MID Server, custom integrations), ensuring reliability, security, latency, error handling, monitoring. * Defining + implementing technical governance, architecture operating models, and instance strategy.
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        AI/ML Principal Engineer

        Velocity Talent Ltd
        Central London (WC1)
        £400 per day £400 a day inside IR35
        Urgent 12-month Hybrid AI/Machine Learning (ML) engineer role paying £400 a day inside IR35 in central London with 2-3 days in the office a week. Start before Christmas, I need to send candidates today for this to be possible. Interviews next week apply asap/Today Build and optimize AI/ML pipelines for predictive modelling, NLP, and generative AI applications. Perform Exploratory Data Analysis (EDA), data mining, and visualization to extract insights. Design and implement Big Data solutions using Hadoop, Spark, PySpark, and Data Lake architectures. Develop and deploy ML models (supervised, unsupervised, tree-based, ensemble methods). Implement deep learning architectures (CNN, RNN, LSTM) using TensorFlow, PyTorch, and Keras. Work on NLP and Generative AI tasks including embeddings, transformers (BERT, GPT), and OpenAI APIs.
        Urgent 12-month Hybrid AI/Machine Learning (ML) engineer role paying £400 a day inside IR35 in central London with 2-3 days in the office a week. Start before Christmas, I need to send candidates today for this to be possible. Interviews next week apply asap/Today Build and optimize AI/ML pipelines for predictive modelling, NLP, and generative AI applications. Perform Exploratory Data Analysis (EDA), data mining, and visualization to extract insights. Design and implement Big Data solutions using Hadoop, Spark, PySpark, and Data Lake architectures. Develop and deploy ML models (supervised, unsupervised, tree-based, ensemble methods). Implement deep learning architectures (CNN, RNN, LSTM) using TensorFlow, PyTorch, and Keras. Work on NLP and Generative AI tasks including embeddings, transformers (BERT, GPT), and OpenAI APIs.
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        C# Developer

        VIQU IT Recruitment
        The City, City of London (EC4), EC4M 7JH
        £300 - 400 per day
        A client is seeking an experienced C# Developer to join their development team and support a key internal initiative. In this role, you'll also play a major part in configuring, enhancing, and integrating Microsoft Dynamics 365 within the business. As a Software Developer, you’ll collaborate closely with senior stakeholders to deliver clean, efficient, and reliable code that underpins critical business applications. * Produce well-structured and clearly documented C# / .NET code. * Configure, customise, and maintain Microsoft Dynamics 365. * Build and support integrations across Dynamics 365 and other systems. * Develop plugins, workflows, and bespoke components within the Dynamics ecosystem. * Work seamlessly with cross-functional teams in a fully remote setting. * Take part in code reviews and contribute to help define best practices.
        A client is seeking an experienced C# Developer to join their development team and support a key internal initiative. In this role, you'll also play a major part in configuring, enhancing, and integrating Microsoft Dynamics 365 within the business. As a Software Developer, you’ll collaborate closely with senior stakeholders to deliver clean, efficient, and reliable code that underpins critical business applications. * Produce well-structured and clearly documented C# / .NET code. * Configure, customise, and maintain Microsoft Dynamics 365. * Build and support integrations across Dynamics 365 and other systems. * Develop plugins, workflows, and bespoke components within the Dynamics ecosystem. * Work seamlessly with cross-functional teams in a fully remote setting. * Take part in code reviews and contribute to help define best practices.
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        1-2 year Fixed-Term Contract £40-£50k South-East England iO Associates is supporting a large public sector organisation, and we are looking for an experienced Azure Data Factory (ADF) Integration Developer to join a collaborative Integration team responsible for designing, building, and maintaining secure, scalable, and resilient data integration solutions. You will work across a wide portfolio of systems and services to enable reliable data movement, API-based integration, and modern cloud-driven workflows. This role is ideal for a proactive integration specialist who enjoys solving complex data engineering challenges, working in Agile environments, and contributing to continuous improvement. Key Responsibilities * Develop, enhance and support Azure Data Factory (ADF) pipelines and dataflows.
        1-2 year Fixed-Term Contract £40-£50k South-East England iO Associates is supporting a large public sector organisation, and we are looking for an experienced Azure Data Factory (ADF) Integration Developer to join a collaborative Integration team responsible for designing, building, and maintaining secure, scalable, and resilient data integration solutions. You will work across a wide portfolio of systems and services to enable reliable data movement, API-based integration, and modern cloud-driven workflows. This role is ideal for a proactive integration specialist who enjoys solving complex data engineering challenges, working in Agile environments, and contributing to continuous improvement. Key Responsibilities * Develop, enhance and support Azure Data Factory (ADF) pipelines and dataflows.
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        FEATURED
        Role:Oracle Fusion Cloud Sr. Technical Integration Manager Location:London, UK Hybrid ( 23 days per week on-site) RoleType:3+months and extendable Salary:Depends on experience echnical expertise in Oracle Integration Cloud (OIC), Oracle Service Oriented Architecture (SOA), and Oracle Service Bus (OSB) * Knowledge of Oracle ERP, HCM, and EPM Cloud integrations will be highly desirable * Good/strong understanding of oracle fusion cloud implementation * Seven or more years of experience in integration development, with at least Five or more years demonstrated experience with OIC * Excellent communication and leadership skills * Strong problem-solving and analytical skills * Proven hands-on expertise designing and building integrations using OIC adapters, REST/SOAP APIs, XML, XSD, XSLT, and JSON, and file-based orchestrations
        Role:Oracle Fusion Cloud Sr. Technical Integration Manager Location:London, UK Hybrid ( 23 days per week on-site) RoleType:3+months and extendable Salary:Depends on experience echnical expertise in Oracle Integration Cloud (OIC), Oracle Service Oriented Architecture (SOA), and Oracle Service Bus (OSB) * Knowledge of Oracle ERP, HCM, and EPM Cloud integrations will be highly desirable * Good/strong understanding of oracle fusion cloud implementation * Seven or more years of experience in integration development, with at least Five or more years demonstrated experience with OIC * Excellent communication and leadership skills * Strong problem-solving and analytical skills * Proven hands-on expertise designing and building integrations using OIC adapters, REST/SOAP APIs, XML, XSD, XSLT, and JSON, and file-based orchestrations
        more
        London, UK Up to £60/hour Outside IR35 Active SC Clearance required iO Associates have aligned exclusively with a multi-nation defence alliance to find an MS Dynamics Developer. The ideal candidate would have extensive hands-on experience across the full Dynamics 365 F&O lifecycle, with strong skills in customisation, integrations, automation, Power Platform development, AI-led enhancements, and stakeholder engagement. * Lead customisation, configuration, and enhancement of Dynamics 365 F&O, ensuring scalable, maintainable solutions. * Drive end-to-end delivery across the full ERP lifecycle, including development, integrations, testing, deployment, and post-go-live support. * Build automated workflows and integrations using Power Platform, REST APIs, and low-code tools to improve business processes.
        London, UK Up to £60/hour Outside IR35 Active SC Clearance required iO Associates have aligned exclusively with a multi-nation defence alliance to find an MS Dynamics Developer. The ideal candidate would have extensive hands-on experience across the full Dynamics 365 F&O lifecycle, with strong skills in customisation, integrations, automation, Power Platform development, AI-led enhancements, and stakeholder engagement. * Lead customisation, configuration, and enhancement of Dynamics 365 F&O, ensuring scalable, maintainable solutions. * Drive end-to-end delivery across the full ERP lifecycle, including development, integrations, testing, deployment, and post-go-live support. * Build automated workflows and integrations using Power Platform, REST APIs, and low-code tools to improve business processes.
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        FEATURED

        Java Developer

        TEKsystems
        Central London, London
        400.00 - 550.00 GBP/Salary
        Description 1. Consumes existing messages from the AMP bus (AMPS is a product from 60East) containing Json messages. 2. Transforms and Routes messages to Dynatrace ingest endpoints. 3. Publishes metrics/dimensions via Dynatrace v2 APIs. 4. Enriches records with required Dynatrace metadata (e.g., dt.entity.host) to correctly bind data to hosts/entitiesmethod for building/maintaining the metadata mapping table to be agreed during design. Key Responsibilities * Design and implement the message consumer and router for Application to Dynatracetarget processor. * Publish metrics/dimensions to Dynatrace v2 APIs correctly and efficiently. * Create and manage metadata enrichment to bind data to hosts/entities (e.g., dt.entity.host). * Ensure security, reliability, and observability of the integration.
        Description 1. Consumes existing messages from the AMP bus (AMPS is a product from 60East) containing Json messages. 2. Transforms and Routes messages to Dynatrace ingest endpoints. 3. Publishes metrics/dimensions via Dynatrace v2 APIs. 4. Enriches records with required Dynatrace metadata (e.g., dt.entity.host) to correctly bind data to hosts/entitiesmethod for building/maintaining the metadata mapping table to be agreed during design. Key Responsibilities * Design and implement the message consumer and router for Application to Dynatracetarget processor. * Publish metrics/dimensions to Dynatrace v2 APIs correctly and efficiently. * Create and manage metadata enrichment to bind data to hosts/entities (e.g., dt.entity.host). * Ensure security, reliability, and observability of the integration.
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        PREMIUM
        Braze Platform Administrator / Braze Campaign Builder Contract Length: 3 Months (w/ Potential Extension) Umbrella Rate: £430 PD (Inside IR35) Location: London Working Pattern: Hybrid (2 Days on Site PW) We are recruiting multiple Braze-certified Platform Administrators / Campaign Builders for a leading, mass-media and telecommunications company. You will configure, maintain, and optimise the Braze Customer Engagement Platform, working within cross-functional squads to build campaign journeys. This is a technical, hands-on role focused on turning marketing strategy into high-quality Braze builds. Key Responsibilities * Configure Braze settings, integrations, APIs, SDKs * Manage user roles, permissions, and workspaces * Support marketing teams with journey planning and campaign execution * Ensure data accuracy, governance, and compliance
        Braze Platform Administrator / Braze Campaign Builder Contract Length: 3 Months (w/ Potential Extension) Umbrella Rate: £430 PD (Inside IR35) Location: London Working Pattern: Hybrid (2 Days on Site PW) We are recruiting multiple Braze-certified Platform Administrators / Campaign Builders for a leading, mass-media and telecommunications company. You will configure, maintain, and optimise the Braze Customer Engagement Platform, working within cross-functional squads to build campaign journeys. This is a technical, hands-on role focused on turning marketing strategy into high-quality Braze builds. Key Responsibilities * Configure Braze settings, integrations, APIs, SDKs * Manage user roles, permissions, and workspaces * Support marketing teams with journey planning and campaign execution * Ensure data accuracy, governance, and compliance
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        Adobe AEM QA Automation

        Vallum Associates Limited
        City of London, London, EC2M 2QS
        £600 per day
        Job Title:Adobe AEM QA Automation Location: London- 3Days/week Onsite Duration: 6months+ Contract Inside IR35 We are seeking a highly skilled QA Automation Engineerwith proven expertise in Java-based test automationand deep working knowledge of the Adobe Experience Manager (AEM)platform. The ideal candidate will be instrumental in designing, building, and maintaining robust, scalable automation frameworks to ensure the quality, performance, and reliability of our digital customer experiences built on AEM. This role requires a strong focus on CI/CD integration and BDD/TDD principles within an Agile/Scrum environment. Key Responsibilities * AEM Test Strategy:Design and implement comprehensive Test Plansand Test Strategiesspecifically for AEM components, templates, workflows, and content authoring functionalities.
        Job Title:Adobe AEM QA Automation Location: London- 3Days/week Onsite Duration: 6months+ Contract Inside IR35 We are seeking a highly skilled QA Automation Engineerwith proven expertise in Java-based test automationand deep working knowledge of the Adobe Experience Manager (AEM)platform. The ideal candidate will be instrumental in designing, building, and maintaining robust, scalable automation frameworks to ensure the quality, performance, and reliability of our digital customer experiences built on AEM. This role requires a strong focus on CI/CD integration and BDD/TDD principles within an Agile/Scrum environment. Key Responsibilities * AEM Test Strategy:Design and implement comprehensive Test Plansand Test Strategiesspecifically for AEM components, templates, workflows, and content authoring functionalities.
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        What is the average salary for API in South East?

        Average salary per year
        £67,499

        The average salary for a API in South East is £67,499. API in South East salaries range from £52,499 to £82,499.

        Frequently Asked Questions

        How many contract API jobs are there in South East?
        There are 389 contract API jobs within 20 miles of South East available on Jobsite right now.

        Where in South East are these contract jobs?
        You can find contract jobs in London, Berkshire, Oxfordshire.

        What other similar jobs are there to contract API jobs in South East?
        As well as contract API jobs in South East, you can find contract IT, Software Development, Management, amongst many others.