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        474 Contract API jobs in London + 20 miles

        API Developer (APIGEE)

        IO Associates
        London
        £500 - £600 per day
        Title: API Developer (APIGEE) Location: London 4- days per week Contract Length: 6 months (Initially) Day Rate: up to £600 per day (Outside IR35) iO Associates is working with a cloud integration consultancy, who are looking for an experienced API Developer to join them on a year-long contract. * Strong experience with SQL * Expertise in APIGEE * Solid background in C# development * Ability to design, develop, and support APIs for scalable integration projects The role offers the chance to work on impactful projects within a collaborative team, with a focus on delivering scalable and efficient API solutions. Our client is looking to fill this role URGENTLY, and for the right candidate they'll interview early next week! If this sounds of interest, I'd be happy to share more details about the role and the team.
        Title: API Developer (APIGEE) Location: London 4- days per week Contract Length: 6 months (Initially) Day Rate: up to £600 per day (Outside IR35) iO Associates is working with a cloud integration consultancy, who are looking for an experienced API Developer to join them on a year-long contract. * Strong experience with SQL * Expertise in APIGEE * Solid background in C# development * Ability to design, develop, and support APIs for scalable integration projects The role offers the chance to work on impactful projects within a collaborative team, with a focus on delivering scalable and efficient API solutions. Our client is looking to fill this role URGENTLY, and for the right candidate they'll interview early next week! If this sounds of interest, I'd be happy to share more details about the role and the team.
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        NEWFEATURED
        Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
        Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
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        NEWPREMIUM
        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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        Axway API Developer

        Randstad Digital
        EC1, City of London
        £500 - £650 per day
        6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
        6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
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        NEWFEATURED

        Senior Integration Developer

        Hays
        London
        £500.0 - £515.0 per day + up to £515 pd (InsideIR35)
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months My client is an instantly recognisable consultancy who seek a Senior Integration Developer, with active SC clearance and experience in Microsoft Dynamics 365 Finance, to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Active Security Clearance (SC) * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics.
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months My client is an instantly recognisable consultancy who seek a Senior Integration Developer, with active SC clearance and experience in Microsoft Dynamics 365 Finance, to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Active Security Clearance (SC) * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics.
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        NEW

        Senior Integration Developer

        Hays
        London
        £500.0 - £515.0 per day + up to £515 pd (InsideIR35)
        Up to £515 per day (Inside IR35) Remote / must be UK based 3 months initially (open to extension) My client is an instantly recognisable consultancy who seek a to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics. * Industry experience within financial services
        Up to £515 per day (Inside IR35) Remote / must be UK based 3 months initially (open to extension) My client is an instantly recognisable consultancy who seek a to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics. * Industry experience within financial services
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        NEW
        Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
        Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
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        NEWPREMIUM

        Mulesoft Technical Lead

        LA International Computer Consultants Ltd
        Lambeth, SE1 7ND
        £700 - £765 per day
        Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
        Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
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        NEW
        Integration Developer with experience of working on large enterprise-scale programmes, ideally in Higher Education, is needed to support a Salesforce Education Cloud, for our higher education client. The role will focus on the integration development using Microsoft Azure PaaS, and support the interim and long-term transition from legacy systems (such as SITS) to cloud-native platforms. Essential Experience * Proven experience as an Integration Developer on enterprise-scale programmes, preferably in Higher Education. * Excellent skills in designing and delivering integrations using Microsoft Azure PaaS (Functions, Logic Apps, API Management, Service Bus,) * Expertise in integration strategy, API management, and canonical data models. * Experience of integrating with Salesforce (REST/SOAP APIs, platform events) and Canvas LMS or similar SaaS platforms.
        Integration Developer with experience of working on large enterprise-scale programmes, ideally in Higher Education, is needed to support a Salesforce Education Cloud, for our higher education client. The role will focus on the integration development using Microsoft Azure PaaS, and support the interim and long-term transition from legacy systems (such as SITS) to cloud-native platforms. Essential Experience * Proven experience as an Integration Developer on enterprise-scale programmes, preferably in Higher Education. * Excellent skills in designing and delivering integrations using Microsoft Azure PaaS (Functions, Logic Apps, API Management, Service Bus,) * Expertise in integration strategy, API management, and canonical data models. * Experience of integrating with Salesforce (REST/SOAP APIs, platform events) and Canvas LMS or similar SaaS platforms.
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        NEW
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
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        FEATURED
        Your new company An opportunity has arisen to join a company that build platforms for mental health professionals and gives employers clear insights into engagement and outcomes. They are looking to expand globally and supporting more time zones and languages. They partner closely with an engineering partner and are now looking for a Technical Business Analyst/ Product Engineer to join the organisation as they part of their growth plans. Your new role They are looking to bring in a Technical BA/ Product Engineer to help them to provide the bridge between product strategy and technical execution, ensuring clear requirements, crisp acceptance criteria and zero ambiguity in hand-offs. The Technical BA/ Product Engineer will also help to reduce dependency risk by capturing and sharing system knowledge as the organisation migrate and scale.
        Your new company An opportunity has arisen to join a company that build platforms for mental health professionals and gives employers clear insights into engagement and outcomes. They are looking to expand globally and supporting more time zones and languages. They partner closely with an engineering partner and are now looking for a Technical Business Analyst/ Product Engineer to join the organisation as they part of their growth plans. Your new role They are looking to bring in a Technical BA/ Product Engineer to help them to provide the bridge between product strategy and technical execution, ensuring clear requirements, crisp acceptance criteria and zero ambiguity in hand-offs. The Technical BA/ Product Engineer will also help to reduce dependency risk by capturing and sharing system knowledge as the organisation migrate and scale.
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        NEW
        Your new role We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Alongside this, you will configure authentication (eg OAuth with Entra ID) and monitor integration jobs for status and failures as well as integrating with Azure services (Logic Apps, Blob Storage) for file-based or hybrid flows if needed. Finally, you will be testing end-to-end scenarios, optimise for high-volume data and ensure audit compliance. What you'll need to succeed Solid D365 Finance integrations, with hands-on use of REST APIs, DMF packages, and OData endpoints.
        Your new role We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Alongside this, you will configure authentication (eg OAuth with Entra ID) and monitor integration jobs for status and failures as well as integrating with Azure services (Logic Apps, Blob Storage) for file-based or hybrid flows if needed. Finally, you will be testing end-to-end scenarios, optimise for high-volume data and ensure audit compliance. What you'll need to succeed Solid D365 Finance integrations, with hands-on use of REST APIs, DMF packages, and OData endpoints.
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        NEW
        Location: UK-wide - Remote based. Employment Type: Permanent Salary: £75,000 - £85,000 per annum, dependent on experience Context Recruitment is working in partnership with a leading IT Services provider to appoint a skilled Full Stack Python Developer with demonstrable experience in data engineering. This role offers the opportunity to contribute to innovative cloud and data-driven projects within a collaborative and forward-thinking technical environment. * Design, build and maintain full-stack applications using Python (Django, Flask or FastAPI) and modern JavaScript frameworks (such as React, Vue or Angular) * Develop and optimise ETL pipelines, data workflows and API integrations * Collaborate with data engineers and analysts to ensure efficient data architecture and accessibility * Work with relational and non-relational databases (e.g. PostgreSQL, MongoDB)
        Location: UK-wide - Remote based. Employment Type: Permanent Salary: £75,000 - £85,000 per annum, dependent on experience Context Recruitment is working in partnership with a leading IT Services provider to appoint a skilled Full Stack Python Developer with demonstrable experience in data engineering. This role offers the opportunity to contribute to innovative cloud and data-driven projects within a collaborative and forward-thinking technical environment. * Design, build and maintain full-stack applications using Python (Django, Flask or FastAPI) and modern JavaScript frameworks (such as React, Vue or Angular) * Develop and optimise ETL pipelines, data workflows and API integrations * Collaborate with data engineers and analysts to ensure efficient data architecture and accessibility * Work with relational and non-relational databases (e.g. PostgreSQL, MongoDB)
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        Data Engineer - AI Projects

        Henderson Scott
        Stevenage, Hertfordshire, SG1 2DA
        £50000.00 - £55000.00 per annum + Bonus, + Substantial Benefits
        Data Engineer - Generative AI Projects?? Hybrid | 2-3 Days On-Site | Up to £55,000 + Bonus + Package?? British Citizens Only | BPSS Clearance Required We're hiring a Data Engineer with a passion for automation, clean pipelines, and the future of AI. This is your chance to shape how data powers Generative AI and NLP tools in a secure, high-tech organisation working on projects that matter. If you're keen to work on innovative internal use-cases - from AI assistants to intelligent search and document automation - this is the perfect next step. What You'll Be Doing * Building and maintaining data pipelines across structured & unstructured sources * Collaborating with internal teams to support Generative AI and NLP projects * Ensuring data is secure, compliant, high-quality, and easy to access * Bringing your ideas to the table as we explore new tools and technologies
        Data Engineer - Generative AI Projects?? Hybrid | 2-3 Days On-Site | Up to £55,000 + Bonus + Package?? British Citizens Only | BPSS Clearance Required We're hiring a Data Engineer with a passion for automation, clean pipelines, and the future of AI. This is your chance to shape how data powers Generative AI and NLP tools in a secure, high-tech organisation working on projects that matter. If you're keen to work on innovative internal use-cases - from AI assistants to intelligent search and document automation - this is the perfect next step. What You'll Be Doing * Building and maintaining data pipelines across structured & unstructured sources * Collaborating with internal teams to support Generative AI and NLP projects * Ensuring data is secure, compliant, high-quality, and easy to access * Bringing your ideas to the table as we explore new tools and technologies
        more
        NEWFEATURED
        PowerBI Specialist (Contract) | £350-£450 p/day (Outside IR35) | 3 Months (strong possibility of extension) | ASAP We're hiring on behalf of a fast-growing SaaS company that's looking for an experienced Power BI Specialist to take ownership of their reporting environment. This is a fully remote contract role, starting immediately. The client has a strong BI foundation in place, but they're now looking for someone who can streamline reporting, reduce maintenance, and optimise their use of Power BI at scale. Right now, customer-specific reports are managed individually (e.g. 45+ reports needing updates when a change is made). They want to consolidate, automate, and improve efficiency across their reporting suite.
        PowerBI Specialist (Contract) | £350-£450 p/day (Outside IR35) | 3 Months (strong possibility of extension) | ASAP We're hiring on behalf of a fast-growing SaaS company that's looking for an experienced Power BI Specialist to take ownership of their reporting environment. This is a fully remote contract role, starting immediately. The client has a strong BI foundation in place, but they're now looking for someone who can streamline reporting, reduce maintenance, and optimise their use of Power BI at scale. Right now, customer-specific reports are managed individually (e.g. 45+ reports needing updates when a change is made). They want to consolidate, automate, and improve efficiency across their reporting suite.
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        NEWFEATURED
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months Security Clearance: NPPV2 / NPPV3 We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks.
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months Security Clearance: NPPV2 / NPPV3 We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks.
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        NEWFEATURED

        Senior .NET Integration Developer

        Oscar Associates (UK) Limited
        SL6, Maidenhead
        £50000 - £65000 per annum
        We have partnered with an exciting SaaS company who are looking for a Senior .NET Integration Developer to join their growing team. You will be developing and maintaining robust integrations with third party systems such as financial services, telematics platforms and mapping APIs. * Develop and maintain secure, well-documented financial and third-party integrations. * Enhance the integration framework for scalability, performance, and industry alignment. * Assist customers and partners in integration setup and API/gateway usage. * Support and expand integrations for features like event tracking and CO2 reporting. * Ensure integration development aligns with modern security and GDPR standards. * Implement structured logging, monitoring, and documentation. * Contribute to internal knowledge bases and explore automation tools (Power Automate, Zapier).
        We have partnered with an exciting SaaS company who are looking for a Senior .NET Integration Developer to join their growing team. You will be developing and maintaining robust integrations with third party systems such as financial services, telematics platforms and mapping APIs. * Develop and maintain secure, well-documented financial and third-party integrations. * Enhance the integration framework for scalability, performance, and industry alignment. * Assist customers and partners in integration setup and API/gateway usage. * Support and expand integrations for features like event tracking and CO2 reporting. * Ensure integration development aligns with modern security and GDPR standards. * Implement structured logging, monitoring, and documentation. * Contribute to internal knowledge bases and explore automation tools (Power Automate, Zapier).
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        FEATURED
        SC Cleared ServiceNow/SNOW Developer - 3-6 months - £400-480pd Inside IR35 - London (Hybrid) My client are a Global Consultancy who are looking for a ServiceNow Developer to design, develop, and maintain solutions on the ServiceNow platform. You will work closely with business analysts, architects, and stakeholders to deliver high-quality applications and workflows that support business objectives and improve service delivery. Key Responsibilities * Develop and configure ServiceNow's SPM suite, applications, modules, and workflows across ITSM, ITOM, HRSD, and other areas. * Create and maintain business rules, client scripts, UI policies, flows, and integrations. * Collaborate with stakeholders to gather requirements and translate them into technical solutions. * Participate in Agile development cycles, including sprint planning, reviews, and retrospectives.
        SC Cleared ServiceNow/SNOW Developer - 3-6 months - £400-480pd Inside IR35 - London (Hybrid) My client are a Global Consultancy who are looking for a ServiceNow Developer to design, develop, and maintain solutions on the ServiceNow platform. You will work closely with business analysts, architects, and stakeholders to deliver high-quality applications and workflows that support business objectives and improve service delivery. Key Responsibilities * Develop and configure ServiceNow's SPM suite, applications, modules, and workflows across ITSM, ITOM, HRSD, and other areas. * Create and maintain business rules, client scripts, UI policies, flows, and integrations. * Collaborate with stakeholders to gather requirements and translate them into technical solutions. * Participate in Agile development cycles, including sprint planning, reviews, and retrospectives.
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        Rate - £500 per day Inside IR35 Duration - 1 month initial Location - Remote with occasional visits into London We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
        Rate - £500 per day Inside IR35 Duration - 1 month initial Location - Remote with occasional visits into London We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
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        FEATURED

        Dynatrace Engineer - SC Cleared

        Stott & May Professional Search Limited
        London
        £350 - £425 per day
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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        NEW
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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        Senior Software Engineer

        Spectrum It Recruitment Limited
        TW18, Staines
        £70000 - £75000 per annum
        Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
        Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
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        NEW
        Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
        Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
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        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
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        NEWPREMIUM
        Solution Architect role - Contract, Inside IR35 - London - Hybrid I am working on an exciting opportunity with a leading insurer operating in the Specialty Markets. They are urgently seeking a highly experienced Solution Architect to join their dynamic on a day-rate contract basis. As a Solution Architect, you will play a pivotal role in shaping the technical direction of innovative digital products, driving architectural excellence across complex insurance solutions. Candidates must have prior experience as a Solution Architect within the Specialty Insurance and/or London Market sector. This domain expertise is critical to understanding the unique challenges and regulatory landscape of the industry. * Translate product vision and business outcomes into technical enablers and architectural building blocks.
        Solution Architect role - Contract, Inside IR35 - London - Hybrid I am working on an exciting opportunity with a leading insurer operating in the Specialty Markets. They are urgently seeking a highly experienced Solution Architect to join their dynamic on a day-rate contract basis. As a Solution Architect, you will play a pivotal role in shaping the technical direction of innovative digital products, driving architectural excellence across complex insurance solutions. Candidates must have prior experience as a Solution Architect within the Specialty Insurance and/or London Market sector. This domain expertise is critical to understanding the unique challenges and regulatory landscape of the industry. * Translate product vision and business outcomes into technical enablers and architectural building blocks.
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        What is the average salary for API in London?

        Average salary per year
        £72,499

        The average salary for a API in London is £72,499. API in London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many contract API jobs are there in London?
        There are 474 contract API jobs within 20 miles of London available on Jobsite right now.

        Where in London are these contract jobs?
        You can find contract jobs in City of London, South East London, Central London.

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