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        160 Contract API jobs in London + 20 miles

        Senior Full Stack Developer JavaScript Python API

        Client Server
        W6, West London
        £85000 - £100000 per annum
        Senior Full Stack Developer / Engineer (JavaScript Python API) London to £100k Opportunity to progress your career in a senior, hands-on Senior Full Stack Developer 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 Full Stack Developer 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 Full Stack Developer / Engineer (JavaScript Python API) London to £100k Opportunity to progress your career in a senior, hands-on Senior Full Stack Developer 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 Full Stack Developer 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
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
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        NEWPREMIUM
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
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        NEWFEATURED

        Fidessa Developer Java - Capital Markets

        Client Server
        The City, EC3
        £100000 - £135000 per annum + bonus + benefits
        Fidessa Developer (Java Spring Boot API) London to £135k Do you have strong Java coding skills combined with experience of developing on the Fidessa order management system? You could be progressing your career at the Investment Management arm of a global bank, gaining an indepth knowledge of Capital Markets. As a Fidessa Developer you will design and develop new features on the Fidessa order management system, collaborating closely with regional and global business stakeholders to understand their requirements and architect, design and execute technical solutions. You'll be based in the London office and have flexibility to work from home once a week. * You have a deep knowledge of Java including Spring Boot and APIs * You have strong experience of developing on Fidessa * You have an understanding of Capital Markets
        Fidessa Developer (Java Spring Boot API) London to £135k Do you have strong Java coding skills combined with experience of developing on the Fidessa order management system? You could be progressing your career at the Investment Management arm of a global bank, gaining an indepth knowledge of Capital Markets. As a Fidessa Developer you will design and develop new features on the Fidessa order management system, collaborating closely with regional and global business stakeholders to understand their requirements and architect, design and execute technical solutions. You'll be based in the London office and have flexibility to work from home once a week. * You have a deep knowledge of Java including Spring Boot and APIs * You have strong experience of developing on Fidessa * You have an understanding of Capital Markets
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        NEWPREMIUM
        We are AMS. We are a global total workforce solutions firm; we enable organisations to thrive in an age of constant change by building, re-shaping, and optimising workforces. Our Contingent Workforce Solutions (CWS) is one of our service offerings; we act as an extension of our clients' recruitment team and provide professional interim and temporary resources. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for a Software Engineer (AI Prompts) for a 6 month contract based in either the bank's London or Edinburgh office on a remote first working model.
        We are AMS. We are a global total workforce solutions firm; we enable organisations to thrive in an age of constant change by building, re-shaping, and optimising workforces. Our Contingent Workforce Solutions (CWS) is one of our service offerings; we act as an extension of our clients' recruitment team and provide professional interim and temporary resources. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for a Software Engineer (AI Prompts) for a 6 month contract based in either the bank's London or Edinburgh office on a remote first working model.
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        NEWFEATURED
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * Experience in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * Experience in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
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        NEW
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * 5+ years in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
        Up to £515 per day (Inside IR35) Remote / must be UK based 12 months We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * 5+ years in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
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        NEW
        AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking.
        AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking.
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        NEWFEATURED

        Power Platform Developer

        Hays
        London
        £500.0 - £550.0 per day + up to £550 pd (Inside IR35)
        Up to £550 per day (Inside IR35) London / Hybrid 6 months My client is an instantly recognisable consultancy who require a Power Platform Developer with Active Security Clearance (SC) to join a business-critical programme. * Proven experience working as a Power Platform Developer with Active Security Clearance (SC). * Involvement developing solutions, with Power Apps, Power Automate and Dataverse. * Working experience of writing advanced DAX measures, and using Power Query * Strong proficiency in SQL to build complex data models, with a good understanding of data modelling principles and best practices * Must have experience mentoring, guiding and supporting juniors * Awareness of Dataverse API * Some experience with Azure Synapse Analytics, Azure Functions, Logic Apps or Azure SQL Database. * Familiarity with Agile ways of working / Project Management methodologies
        Up to £550 per day (Inside IR35) London / Hybrid 6 months My client is an instantly recognisable consultancy who require a Power Platform Developer with Active Security Clearance (SC) to join a business-critical programme. * Proven experience working as a Power Platform Developer with Active Security Clearance (SC). * Involvement developing solutions, with Power Apps, Power Automate and Dataverse. * Working experience of writing advanced DAX measures, and using Power Query * Strong proficiency in SQL to build complex data models, with a good understanding of data modelling principles and best practices * Must have experience mentoring, guiding and supporting juniors * Awareness of Dataverse API * Some experience with Azure Synapse Analytics, Azure Functions, Logic Apps or Azure SQL Database. * Familiarity with Agile ways of working / Project Management methodologies
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        NEW

        DevSecOps Pentester

        Stackstudio Digital Ltd.
        London
        From £450 to £500 per day
        Role/Job Title: DevSecOps Pentester Work Location: London (2 - 3days) The Role Conducts security assessments and penetration tests across CI/CD pipelines, cloud infrastructure, and application environments. Integrates automated security tools and practices within DevOps workflows to ensure continuous security validation. Identifies and exploits vulnerabilities in code, containers, APIs, and infrastructure-as-code before they reach production. Collaborates with development, security, and operations teams to implement remediation and improve security posture. Stays current with threat landscapes, tools, and methodologies to proactively defend against evolving cyber risks in general and more specific to an airline industry, transportation sector. Your Responsibilities
        Role/Job Title: DevSecOps Pentester Work Location: London (2 - 3days) The Role Conducts security assessments and penetration tests across CI/CD pipelines, cloud infrastructure, and application environments. Integrates automated security tools and practices within DevOps workflows to ensure continuous security validation. Identifies and exploits vulnerabilities in code, containers, APIs, and infrastructure-as-code before they reach production. Collaborates with development, security, and operations teams to implement remediation and improve security posture. Stays current with threat landscapes, tools, and methodologies to proactively defend against evolving cyber risks in general and more specific to an airline industry, transportation sector. Your Responsibilities
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        NEW
        ServiceNow Automation Analyst - SC Cleared Location: London / Gloucester / Warrington (Hybrid) Duration: 6 Months (Contract) Day Rate: £382.50 (Inside IR35) Start Date: ASAP Clearance Required: Security Clearance - Mandatory About the Role We are seeking an experienced ServiceNow Automation Analyst to join our team on a 6-month contract. You will be responsible for analysing, designing, developing, and implementing automation solutions within the ServiceNow platform, enhancing IT service delivery, operational efficiency, and user experience. This is a hands-on technical role requiring strong ServiceNow development skills, automation expertise, and the ability to collaborate effectively with stakeholders across IT and business units. Key Responsibilities Collaborate with IT and business stakeholders to gather and analyse automation requirements.
        ServiceNow Automation Analyst - SC Cleared Location: London / Gloucester / Warrington (Hybrid) Duration: 6 Months (Contract) Day Rate: £382.50 (Inside IR35) Start Date: ASAP Clearance Required: Security Clearance - Mandatory About the Role We are seeking an experienced ServiceNow Automation Analyst to join our team on a 6-month contract. You will be responsible for analysing, designing, developing, and implementing automation solutions within the ServiceNow platform, enhancing IT service delivery, operational efficiency, and user experience. This is a hands-on technical role requiring strong ServiceNow development skills, automation expertise, and the ability to collaborate effectively with stakeholders across IT and business units. Key Responsibilities Collaborate with IT and business stakeholders to gather and analyse automation requirements.
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        NEW
        Job Title: Senior Developer Location:Osterley, UK (Hybrid) Duration: 6 months-Extendable * Architect, develop, and maintain scalable TypeScript/Node.js services and GraphQL APIs. * Write resilient, maintainable code with a strong focus on automated testing (unit, integration, functional, end-to-end, visual regression, Lighthouse). * Collaborate on DevOps practices: CI/CD (Jenkins, Concourse), containerisation, Helm chart authoring, and Kubernetes deployments. * Work within a cross-functional Agile team, contributing to technical direction, code reviews, and process improvements. * Ensure code is performant, secure, observable, and aligned with best practices. * Mentor and support junior developers, fostering a culture of technical excellence. * Extensive experience with TypeScript and Node.js in production environments.
        Job Title: Senior Developer Location:Osterley, UK (Hybrid) Duration: 6 months-Extendable * Architect, develop, and maintain scalable TypeScript/Node.js services and GraphQL APIs. * Write resilient, maintainable code with a strong focus on automated testing (unit, integration, functional, end-to-end, visual regression, Lighthouse). * Collaborate on DevOps practices: CI/CD (Jenkins, Concourse), containerisation, Helm chart authoring, and Kubernetes deployments. * Work within a cross-functional Agile team, contributing to technical direction, code reviews, and process improvements. * Ensure code is performant, secure, observable, and aligned with best practices. * Mentor and support junior developers, fostering a culture of technical excellence. * Extensive experience with TypeScript and Node.js in production environments.
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        Role Title: Security Engineer Duration: 6 Months Location: London (2-3 Days onsite) Rate: £650 Per day - Umbrella only Would you like to join a global leader in consulting, technology services and digital transformation? Our client is at the forefront of innovation to address the entire breadth of opportunities in the evolving world of cloud, digital and platforms. Role purpose / summary * SSPM or CSPM knowledge, policies, and configurations * API knowledge - CSPM integration with other tools using APIs * ServiceNow and/or O365 experience and security aspects of these applications * Docker experience on both windows and Unix * CSPM experience with AppOmni or other native Microsoft tools * SIEM integration * Hands on Unix or Windows skills * Infrastructure as a Code (IaC), ARM, CloudFormation, Terraform, GIT experience * Excellent documentation skills
        Role Title: Security Engineer Duration: 6 Months Location: London (2-3 Days onsite) Rate: £650 Per day - Umbrella only Would you like to join a global leader in consulting, technology services and digital transformation? Our client is at the forefront of innovation to address the entire breadth of opportunities in the evolving world of cloud, digital and platforms. Role purpose / summary * SSPM or CSPM knowledge, policies, and configurations * API knowledge - CSPM integration with other tools using APIs * ServiceNow and/or O365 experience and security aspects of these applications * Docker experience on both windows and Unix * CSPM experience with AppOmni or other native Microsoft tools * SIEM integration * Hands on Unix or Windows skills * Infrastructure as a Code (IaC), ARM, CloudFormation, Terraform, GIT experience * Excellent documentation skills
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        PREMIUM

        Lead AI Engineer

        Change-IT Consulting Ltd
        London
        From £700 to £750 per day
        Lead Applied AI Engineer 6 Months Hybrid between London, Bristol or Manchester INSIDE IR35 £700-£750 per day Change-IT are looking for a Lead AI Engineer to join a large central government organisation based in London. This role is for 6 months initially, with possibility of extension. This role is INSIDE IR35, paying between £700-£750 per day dependent on experience. * Proficiency in Python. * Working in dynamic environments and navigating ambiguity, prioritising ruthlessly where necessary * Have a humble attitude and an eagerness to help others with empathy * Passion for building products that augment human capabilities and improves citizens lives. * Experience with natural language processing, deep learning and generative AI. * Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
        Lead Applied AI Engineer 6 Months Hybrid between London, Bristol or Manchester INSIDE IR35 £700-£750 per day Change-IT are looking for a Lead AI Engineer to join a large central government organisation based in London. This role is for 6 months initially, with possibility of extension. This role is INSIDE IR35, paying between £700-£750 per day dependent on experience. * Proficiency in Python. * Working in dynamic environments and navigating ambiguity, prioritising ruthlessly where necessary * Have a humble attitude and an eagerness to help others with empathy * Passion for building products that augment human capabilities and improves citizens lives. * Experience with natural language processing, deep learning and generative AI. * Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
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        NEW
        6-month contract Outside IR35 - £475 per day Hybrid - 2 days a week in the London Office We are seeking a highly capable, hands-on .NET Contractor to deliver high-quality solutions at pace. You will work with a modern .NET codebase (≥ .NET 8.0), occasionally interpreting Java to support .NET implementations. This role suits someone who is delivery-focused, practical, and confident working across platforms. Key Responsibilities * Deliver clean, maintainable, and testable C#/.NET code to a high standard. * Quickly turn around features and tasks without compromising quality. * Interpret existing Java code where required. * Collaborate with SMEs and the Engineering Lead to align with scope and priorities. * Own tasks end-to-end, from requirements to production release, with minimal supervision. Skills & Experience
        6-month contract Outside IR35 - £475 per day Hybrid - 2 days a week in the London Office We are seeking a highly capable, hands-on .NET Contractor to deliver high-quality solutions at pace. You will work with a modern .NET codebase (≥ .NET 8.0), occasionally interpreting Java to support .NET implementations. This role suits someone who is delivery-focused, practical, and confident working across platforms. Key Responsibilities * Deliver clean, maintainable, and testable C#/.NET code to a high standard. * Quickly turn around features and tasks without compromising quality. * Interpret existing Java code where required. * Collaborate with SMEs and the Engineering Lead to align with scope and priorities. * Own tasks end-to-end, from requirements to production release, with minimal supervision. Skills & Experience
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        NEW
        Permanent Location: UK - Remote Salary: £70,000 - £80,000 (+ benefits) Skills: Team Management, Python, Java, CI/CD, BDD (Cucumber), Energy / Financial Trading experience (desirable) We're recruiting a Lead Automation Tester for a leading software company that develops advanced solutions for trading and risk management across global financial and energy markets. This is a fantastic opportunity for an experienced Automation Engineer with proven team leadership or management experience to take ownership of automation practices and guide a small, skilled team. You'll play a key role in driving an automation-first culture, ensuring quality and scalability across complex, high-volume systems. This is a UK based fully remote role. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban
        Permanent Location: UK - Remote Salary: £70,000 - £80,000 (+ benefits) Skills: Team Management, Python, Java, CI/CD, BDD (Cucumber), Energy / Financial Trading experience (desirable) We're recruiting a Lead Automation Tester for a leading software company that develops advanced solutions for trading and risk management across global financial and energy markets. This is a fantastic opportunity for an experienced Automation Engineer with proven team leadership or management experience to take ownership of automation practices and guide a small, skilled team. You'll play a key role in driving an automation-first culture, ensuring quality and scalability across complex, high-volume systems. This is a UK based fully remote role. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban
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        NEW

        SuiteCRM Developer - Remote - Inside IR35

        The Bridge (IT Recruitment) Limited
        Greenwich, SE10 0AA
        £430 - 450 per day
        This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
        This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
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        NEW
        This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
        This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
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        NEW
        Automation Tester Permanent Location: UK - Remote Salary: £55,000 - £65,000 (+ benefits) Skills: Python, Java, CI/CD, BDD (Cucumber), Energy / Financial Trading experience (desirable) We are looking to recruit an Automation Tester for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. This is a UK based fully remote role. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows * CI/CD pipelines and debugging expertise * BDD frameworks such as Cucumber
        Automation Tester Permanent Location: UK - Remote Salary: £55,000 - £65,000 (+ benefits) Skills: Python, Java, CI/CD, BDD (Cucumber), Energy / Financial Trading experience (desirable) We are looking to recruit an Automation Tester for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. This is a UK based fully remote role. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows * CI/CD pipelines and debugging expertise * BDD frameworks such as Cucumber
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        NEW

        Camunda Developer

        Stott & May Professional Search Limited
        London
        £340 - £382.50 per day
        Location: London (Hybrid - 2-3 days on-site) Duration: Until 31st December 2026 Day Rate: £382.50 (Inside IR35) About the Role We are seeking an experienced Camunda Developer to design, develop, and deploy business process automation solutions using the Camunda BPM platform. This role is pivotal in building scalable, process-driven applications that streamline business workflows and decision-making. You will collaborate closely with business analysts, architects, and developers to deliver high-quality workflow orchestration solutions. This long-term contract offers the opportunity to work on large-scale digital transformation initiatives within a secure environment. Key Responsibilities Design and implement BPMN workflows and DMN decision tables using Camunda. Develop custom Java delegates and external task workers.
        Location: London (Hybrid - 2-3 days on-site) Duration: Until 31st December 2026 Day Rate: £382.50 (Inside IR35) About the Role We are seeking an experienced Camunda Developer to design, develop, and deploy business process automation solutions using the Camunda BPM platform. This role is pivotal in building scalable, process-driven applications that streamline business workflows and decision-making. You will collaborate closely with business analysts, architects, and developers to deliver high-quality workflow orchestration solutions. This long-term contract offers the opportunity to work on large-scale digital transformation initiatives within a secure environment. Key Responsibilities Design and implement BPMN workflows and DMN decision tables using Camunda. Develop custom Java delegates and external task workers.
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        NEW

        Java Developer - Active SC

        Hays
        London
        £600.0 - £640.0 per day + up to £640 pd (Inside IR35)
        Up to £640 per day (Inside IR35) London / Remote 6 months My client is an instantly recognisable consultancy who urgently requires a Lead Full Stack Developer to join a business-critical programme. * Proven experience working as a Lead Java Developer within the public sector * Active Security Clearance (SC) * Java (8/11/17+): Expert-level programming and deep understanding of the language and its core libraries * Spring Boot: Expert in building RESTful APIs and microservices * AWS: Strong experience with core AWS services (EC2, S3, Lambda, IAM, etc.) * Kafka / Messaging Systems: Expertise in building event-driven architectures * SQL: Strong experience with relational databases and query optimization * REST / JSON APIs: Designing, developing, and consuming scalable APIs * Docker: Proficiency in containerizing applications for local and cloud environments
        Up to £640 per day (Inside IR35) London / Remote 6 months My client is an instantly recognisable consultancy who urgently requires a Lead Full Stack Developer to join a business-critical programme. * Proven experience working as a Lead Java Developer within the public sector * Active Security Clearance (SC) * Java (8/11/17+): Expert-level programming and deep understanding of the language and its core libraries * Spring Boot: Expert in building RESTful APIs and microservices * AWS: Strong experience with core AWS services (EC2, S3, Lambda, IAM, etc.) * Kafka / Messaging Systems: Expertise in building event-driven architectures * SQL: Strong experience with relational databases and query optimization * REST / JSON APIs: Designing, developing, and consuming scalable APIs * Docker: Proficiency in containerizing applications for local and cloud environments
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        NEW
        Contract / Outside IR35 A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadmap
        Contract / Outside IR35 A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadmap
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        NEW

        Front End Engineer React - Hedge Fund

        Client Server
        Victoria, SW1
        £60000 - £95000 per annum + bonus + benefits
        Front End Engineer / Developer (React v19 TypeScript) London / WFH to £95k Are you a Front End technologist looking for an opportunity to progress your career in a hands-on role with lots of learning opportunities? You could be joining a Hedge Fund with complex work and substantial bonus earning potential. As a Front End Engineer you'll join a globally distributed team to develop engaging and simple user interfaces across all internal business systems. You'll collaborate with UX and Product teams, actively participating in all stages of a project, through product design, development, implementation, testing and maintenance. You'll join colleagues in the impressive Central London office with flexibility to work from home twice a week. * You have strong Front End development skills with React (they're using v19) and TypeScript
        Front End Engineer / Developer (React v19 TypeScript) London / WFH to £95k Are you a Front End technologist looking for an opportunity to progress your career in a hands-on role with lots of learning opportunities? You could be joining a Hedge Fund with complex work and substantial bonus earning potential. As a Front End Engineer you'll join a globally distributed team to develop engaging and simple user interfaces across all internal business systems. You'll collaborate with UX and Product teams, actively participating in all stages of a project, through product design, development, implementation, testing and maintenance. You'll join colleagues in the impressive Central London office with flexibility to work from home twice a week. * You have strong Front End development skills with React (they're using v19) and TypeScript
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        NEWPREMIUM
        Fully Remote - UK 3 Month Contract Rate: £450 - £500 (Inside IR35) We are looking to recruit a Golang Backend Developer for a global software organisation on an initial 3 month contract. This is an excellent opportunity to contribute to high-performance backend systems in a collaborative environment and make a tangible impact on scalable, secure products. * Write clean, maintainable, and high-quality Go code following best practices. * Design, develop, and maintain large-scale backend systems with a focus on performance, reliability, and scalability. * Build and maintain API-based interfaces, ensuring security and compliance with industry standards. * Collaborate with cross-functional teams to understand requirements and translate them into technical solutions. * Participate in code reviews, provide constructive feedback, and help raise engineering standards.
        Fully Remote - UK 3 Month Contract Rate: £450 - £500 (Inside IR35) We are looking to recruit a Golang Backend Developer for a global software organisation on an initial 3 month contract. This is an excellent opportunity to contribute to high-performance backend systems in a collaborative environment and make a tangible impact on scalable, secure products. * Write clean, maintainable, and high-quality Go code following best practices. * Design, develop, and maintain large-scale backend systems with a focus on performance, reliability, and scalability. * Build and maintain API-based interfaces, ensuring security and compliance with industry standards. * Collaborate with cross-functional teams to understand requirements and translate them into technical solutions. * Participate in code reviews, provide constructive feedback, and help raise engineering standards.
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        Back End Integration Engineer

        I3 Resourcing Limited
        The City, EC3V 3ND
        £70000 - £80000 per annum + + BENS + BONUS
        London (Hybrid) | ?? Full-time | ?? Permanent | ?? Competitive + Excellent Benefits Reports To: Data Engineering Manager?? Join us on Our Digital Transformation Journey! We're building a cutting-edge suite of automation and data services to power the next phase of growth in the insurance market. Now, we're on the hunt for a passionate and highly skilled Back End Integration Engineer to help us reimagine how our business operates. If you're a creative problem solver, excited by innovative technologies, and experienced in integration and automation within a cloud environment - we want to hear from you. What You'll Be Doing You'll be part of our growing Data and Engineering team, working on exciting, high-impact projects across the entire business.
        London (Hybrid) | ?? Full-time | ?? Permanent | ?? Competitive + Excellent Benefits Reports To: Data Engineering Manager?? Join us on Our Digital Transformation Journey! We're building a cutting-edge suite of automation and data services to power the next phase of growth in the insurance market. Now, we're on the hunt for a passionate and highly skilled Back End Integration Engineer to help us reimagine how our business operates. If you're a creative problem solver, excited by innovative technologies, and experienced in integration and automation within a cloud environment - we want to hear from you. What You'll Be Doing You'll be part of our growing Data and Engineering team, working on exciting, high-impact projects across the entire business.
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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 160 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 .NET Developer, IT, Software Development, amongst many others.