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        51 Contract API jobs in Chertsey + 20 miles

        505 exact matches jobs are outside your preferred location

        Solution Architect - (HCM) SC Cleared

        Henderson Scott
        London
        £700 - £800 per day + Umbrella rate (inside IR35)
        Solution Architect - Active SC Cleared - Location: Hybrid (20% in London or Glasgow) | Engagement: Contract - Inside IR35 | Duration: Initial 6 Months | Clearance: SC Clearance Essential - Our client requires a high-calibre Solution Architect with extensive HCM (Workday / Oracle HCM / Successfactors) experince to establish and deliver the integrations sub-workstream from the ground up. This role is critical for technical readiness, involving the design of integration patterns that will connect the new HCM with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery - You will report directly to the Senior Technical Delivery Manager, acting as the primary authority for all Workday integration design and delivery. * Integration Strategy: Define, develop, and own the Workday integration strategy and road
        Solution Architect - Active SC Cleared - Location: Hybrid (20% in London or Glasgow) | Engagement: Contract - Inside IR35 | Duration: Initial 6 Months | Clearance: SC Clearance Essential - Our client requires a high-calibre Solution Architect with extensive HCM (Workday / Oracle HCM / Successfactors) experince to establish and deliver the integrations sub-workstream from the ground up. This role is critical for technical readiness, involving the design of integration patterns that will connect the new HCM with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery - You will report directly to the Senior Technical Delivery Manager, acting as the primary authority for all Workday integration design and delivery. * Integration Strategy: Define, develop, and own the Workday integration strategy and road
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        FEATURED
        API Development & Integration - Proficient in designing and building RESTful APIs using FastAPI, Flask, or Django REST Framework for exposing AI models and automation services. Experience with API authentication (OAuth, JWT), rate limiting, error handling, API documentation (Swagger/OpenAPI), webhooks, and integrating disparate systems to create seamless automated workflows. Ability to assess when RPA vs. API integration vs. AI solutions are most appropriate, and experience building hybrid automation solutions combining multiple technologies.
        API Development & Integration - Proficient in designing and building RESTful APIs using FastAPI, Flask, or Django REST Framework for exposing AI models and automation services. Experience with API authentication (OAuth, JWT), rate limiting, error handling, API documentation (Swagger/OpenAPI), webhooks, and integrating disparate systems to create seamless automated workflows. Ability to assess when RPA vs. API integration vs. AI solutions are most appropriate, and experience building hybrid automation solutions combining multiple technologies.
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        Senior Backend Engineer (Telco Integration Lead) Golang

        Ventula Consulting Limited
        The City, City of London (EC3), EC3V 9DU
        Up to £160,000 per annum
        We are seeking a foundational engineer to own our single greatest strategic asset: our unique, privileged access to network-level intelligence via the GSMA CAMARA API standard. Own and build the Security Signal Ingestion path, the secure, low-latency, and out-of-band data channel connecting to our founding members' network API gateways. Ensure all network API integrations meet the stringent P99 latency budgets (e.g., < 150ms) required to support our sub-500ms Time-to-Trust product goal. Collaborate with the platform team to build a parallel development path using mocked data to mitigate risks of network API delays. Deep understanding of API design (REST, gRPC, Webhooks) and API security (OAuth 2.0, mTLS, JWTs).
        We are seeking a foundational engineer to own our single greatest strategic asset: our unique, privileged access to network-level intelligence via the GSMA CAMARA API standard. Own and build the Security Signal Ingestion path, the secure, low-latency, and out-of-band data channel connecting to our founding members' network API gateways. Ensure all network API integrations meet the stringent P99 latency budgets (e.g., < 150ms) required to support our sub-500ms Time-to-Trust product goal. Collaborate with the platform team to build a parallel development path using mocked data to mitigate risks of network API delays. Deep understanding of API design (REST, gRPC, Webhooks) and API security (OAuth 2.0, mTLS, JWTs).
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        NEW

        Solutions Architect

        Deerfoot Recruitment Solutions
        City of London (EC2), EC2Y 9AE
        £70000 - £80000 per annum + + Benefits + Bonus + Hybrid Working
        Anti-Money Laundering / Financial Crime - Hybrid - 3 days per week in London (near Moorgate) Up to £80,000 + bonus + benefits - Banking / Financial Services - Are you ready to shape the next generation of AML and sanctions technology across the EMEA region of an international banking group? In this techno-functional role (60% technical, 40% functional), you will own the design and evolution of key Anti-Money Laundering and Sanction Screening platforms, working at the heart of Compliance Technology. You will turn complex regulatory requirements into scalable, secure solutions that protect the organisation and its clients. Working hybrid from the banks' London office near Moorgate, you will partner with Compliance, FinCrime, Risk and Technology teams to define the technical roadmap, drive best practice and ensure the platforms can handle massive volumes of transaction a
        Anti-Money Laundering / Financial Crime - Hybrid - 3 days per week in London (near Moorgate) Up to £80,000 + bonus + benefits - Banking / Financial Services - Are you ready to shape the next generation of AML and sanctions technology across the EMEA region of an international banking group? In this techno-functional role (60% technical, 40% functional), you will own the design and evolution of key Anti-Money Laundering and Sanction Screening platforms, working at the heart of Compliance Technology. You will turn complex regulatory requirements into scalable, secure solutions that protect the organisation and its clients. Working hybrid from the banks' London office near Moorgate, you will partner with Compliance, FinCrime, Risk and Technology teams to define the technical roadmap, drive best practice and ensure the platforms can handle massive volumes of transaction a
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        FEATURED
        We are looking for Salesforce Architects (Solution and Technical) to help deliver next-gen solutions across Insurance & Financial Services. If you thrive on complex architecture, hands-on design, and steering clients toward best-practice cloud solutions we want to talk! Lead end-to-end Salesforce & SFI Insurance Cloud architecture Drive discovery sessions, technical design, and delivery excellence Guide dev teams, review code, and ensure solution quality Work across OmniStudio, Insurance Cloud, Health Cloud, FSC & Experience Cloud 8+ yrs technical leadership 5+ yrs Salesforce dev (Apex, LWC, APIs) Strong SFI Insurance Cloud experience (Quoting, Policy Admin, FNOL, Claims, etc.) Salesforce/SFI certifications This is a Hybrid contract inside IR 35 Apply now and architect the future!
        We are looking for Salesforce Architects (Solution and Technical) to help deliver next-gen solutions across Insurance & Financial Services. If you thrive on complex architecture, hands-on design, and steering clients toward best-practice cloud solutions we want to talk! Lead end-to-end Salesforce & SFI Insurance Cloud architecture Drive discovery sessions, technical design, and delivery excellence Guide dev teams, review code, and ensure solution quality Work across OmniStudio, Insurance Cloud, Health Cloud, FSC & Experience Cloud 8+ yrs technical leadership 5+ yrs Salesforce dev (Apex, LWC, APIs) Strong SFI Insurance Cloud experience (Quoting, Policy Admin, FNOL, Claims, etc.) Salesforce/SFI certifications This is a Hybrid contract inside IR 35 Apply now and architect the future!
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        Software Engineering Lead Java AI - FinTech

        Client Server
        Shoreditch, East London (E1), EC2A
        £120000 - £140000 per annum + bonus + benefits
        Software Engineering Lead (Java AI) London / WFH to £140k - Are you a technical leader with a strong knowledge of AI and its practical uses within software engineering? You could be progressing your career in a senior, hands-on Engineering Manager role at a global FinTech / CFD trading company that has been consistently voted as one of the UKs top employers. As a Software Engineering Lead you'll head up a team of nine Software Engineers whilst remaining hands-on with coding. Your primary focus will be on using Claude code (and other AI tools and frameworks) throughout the development lifecycle from initial requirements shaping through to deployment to improve speed and efficiency of software development and release. This is an influential role where you and your team will work across product engineering teams to showcase processes and procedures with AI without cuttin
        Software Engineering Lead (Java AI) London / WFH to £140k - Are you a technical leader with a strong knowledge of AI and its practical uses within software engineering? You could be progressing your career in a senior, hands-on Engineering Manager role at a global FinTech / CFD trading company that has been consistently voted as one of the UKs top employers. As a Software Engineering Lead you'll head up a team of nine Software Engineers whilst remaining hands-on with coding. Your primary focus will be on using Claude code (and other AI tools and frameworks) throughout the development lifecycle from initial requirements shaping through to deployment to improve speed and efficiency of software development and release. This is an influential role where you and your team will work across product engineering teams to showcase processes and procedures with AI without cuttin
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        PREMIUM
        In-depth understanding of data structures, system architecture, API development for microservices frameworks, distributed systems and other backend-related concepts and best practices
        In-depth understanding of data structures, system architecture, API development for microservices frameworks, distributed systems and other backend-related concepts and best practices
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        Senior Python Developer - Team Leader

        Transforming Learning Group
        City of London, London
        £55000 - £62000 per annum
        Senior Python Developer Team Lead - Location-Remote (UK-based) Salary - £55,000 £62,000 - Transforming Learning Groupis a forward-thinking education technology group working with over 5,000 schools across the UK. Our mission is simple: to help schools harness technology and data to improve outcomes for every learner. Through our brands including turn IT on, School ICT Services, SalamanderSoft and more we deliver solutions that make schools more efficient, effective and innovative. Were looking for aSenior Python Developer Team Leadto join our growing engineering team. This is a hands-on leadership role where youll set standards, mentor developers, and help shape the future of our cloud-native learning products. If youre passionate about building scalable solutions and leading technical teams, this could be the perfect opportunity. What youll be doing
        Senior Python Developer Team Lead - Location-Remote (UK-based) Salary - £55,000 £62,000 - Transforming Learning Groupis a forward-thinking education technology group working with over 5,000 schools across the UK. Our mission is simple: to help schools harness technology and data to improve outcomes for every learner. Through our brands including turn IT on, School ICT Services, SalamanderSoft and more we deliver solutions that make schools more efficient, effective and innovative. Were looking for aSenior Python Developer Team Leadto join our growing engineering team. This is a hands-on leadership role where youll set standards, mentor developers, and help shape the future of our cloud-native learning products. If youre passionate about building scalable solutions and leading technical teams, this could be the perfect opportunity. What youll be doing
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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. You will be expected to employ best design and development practices, solve technical challenges, and contribute to high-quality system analysis and developme
        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. You will be expected to employ best design and development practices, solve technical challenges, and contribute to high-quality system analysis and developme
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        NEW
        Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
        Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
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        FEATURED

        Principal Java Engineer

        Franklin Bates Limited
        London
        From £125,000 to £140,000 per annum
        Principal Engineer FinTech SaaS - Location: Hybrid, UK-based (no visa sponsorship) Contract: Permanent - About - Our client is an innovative B2B FinTech company transforming the SME lending market. Their SaaS solutions help banks and lenders make decisions using live transactional data. Trusted by a wide range of financial institutions, they are scaling rapidly and looking for a senior technical leader to join their journey. The Role - We are seeking a Principal Engineer to act as a trusted technical authority. Youll guide technical direction, mentor engineers, and collaborate with stakeholders to deliver scalable, commercially valuable solutions. This is a hands-on leadership role across multiple product teams. Key Responsibilities * Lead architecture and technical strategy across product teams. * Design and build robust platform functionality (APIs, integrations, da
        Principal Engineer FinTech SaaS - Location: Hybrid, UK-based (no visa sponsorship) Contract: Permanent - About - Our client is an innovative B2B FinTech company transforming the SME lending market. Their SaaS solutions help banks and lenders make decisions using live transactional data. Trusted by a wide range of financial institutions, they are scaling rapidly and looking for a senior technical leader to join their journey. The Role - We are seeking a Principal Engineer to act as a trusted technical authority. Youll guide technical direction, mentor engineers, and collaborate with stakeholders to deliver scalable, commercially valuable solutions. This is a hands-on leadership role across multiple product teams. Key Responsibilities * Lead architecture and technical strategy across product teams. * Design and build robust platform functionality (APIs, integrations, da
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        NEWFEATURED

        Data Engineer

        TALENT INTERNATIONAL UK LTD
        The City, City of London (EC3), EC3M
        £490.00 per day
        1 year Contract. Remote £490 per day. Inside IR35 - Our Central Government client is looking for an experienced Data Engineer to work on a brand new AI-focused Digital project in a GDS environment. Technical Responsibilities * Build and maintain data pipelines in Azure (ADF, Databricks, Key Vault). * Develop ingestion workflows for APIs, structured data, and CSV sources. * Implement Infrastructure as Code (Bicep) for Dev/Test environments. * Deliver Bronze and Silver layer transformations using Python and SQL. * Create data validation and data quality reporting processes. * Support integration across systems (IDS/Postgres, Dataverse CRM, Web App platform). * Implement secure, role-based data access controls. * Ensure code quality, scalability, and compliance with DfE technical and security standards. Delivery and Collaboration
        1 year Contract. Remote £490 per day. Inside IR35 - Our Central Government client is looking for an experienced Data Engineer to work on a brand new AI-focused Digital project in a GDS environment. Technical Responsibilities * Build and maintain data pipelines in Azure (ADF, Databricks, Key Vault). * Develop ingestion workflows for APIs, structured data, and CSV sources. * Implement Infrastructure as Code (Bicep) for Dev/Test environments. * Deliver Bronze and Silver layer transformations using Python and SQL. * Create data validation and data quality reporting processes. * Support integration across systems (IDS/Postgres, Dataverse CRM, Web App platform). * Implement secure, role-based data access controls. * Ensure code quality, scalability, and compliance with DfE technical and security standards. Delivery and Collaboration
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        NEW

        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
        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
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        FEATURED
        Location/s: London - Recruiter contact: Nikki George - Mott MacDonald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices. We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve. Our people power our performance we succeed when they do. With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual. Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, youre surrounded by global specialists who want to combine their expertise and champion you to be your best. As a proudly employee-owned business, we benefit our clients, our communities, a
        Location/s: London - Recruiter contact: Nikki George - Mott MacDonald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices. We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve. Our people power our performance we succeed when they do. With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual. Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, youre surrounded by global specialists who want to combine their expertise and champion you to be your best. As a proudly employee-owned business, we benefit our clients, our communities, a
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        Senior Full Stack .Net Developer

        Hays
        Gatwick (RH6)
        £65000 - £75000 per annum + £65-75k + Benefits
        Gatwick (1-2 days per week in office) £65-75k + Benefits. Your new company - This leading financial and consulting business are looking to bolster their engineering team with a Senior Full Stack .Net Developer to join their core team of 16 Devs. You will be working in their state-of-the-art offices near to Gatwick/Crawley and will be required to work 1-2 days per week in the office. Your new role - This is a full-stack, full software lifecycle role where Devs are encouraged to bring ideas to the table and challenge the status quo. From architecture and development through to deployment you'll play a key role in building cutting-edge solutions by developing .NET microservices and dynamic Angular front-end applications (we can consider React cross-training to Angular). Working in a collaborative Agile environment, you'll partner with product owners, QA engineers, and fe
        Gatwick (1-2 days per week in office) £65-75k + Benefits. Your new company - This leading financial and consulting business are looking to bolster their engineering team with a Senior Full Stack .Net Developer to join their core team of 16 Devs. You will be working in their state-of-the-art offices near to Gatwick/Crawley and will be required to work 1-2 days per week in the office. Your new role - This is a full-stack, full software lifecycle role where Devs are encouraged to bring ideas to the table and challenge the status quo. From architecture and development through to deployment you'll play a key role in building cutting-edge solutions by developing .NET microservices and dynamic Angular front-end applications (we can consider React cross-training to Angular). Working in a collaborative Agile environment, you'll partner with product owners, QA engineers, and fe
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        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

        Backend Software Engineer TypeScript Node AWS

        Client Server
        Shoreditch, East London (E1), EC2A
        £75000 - £85000 per annum + benefits
        Backend Software Engineer / Developer (TypeScript Node AWS) Remote to £85k - Are you a backend focussed Software Engineer looking for an opportunity to progress your career, whilst working remotely on a modern tech stack? You could be joining a scaling AI software solutions provider in a senior, hands-on role. As a Backend Software Engineer you will build new features with a focus on backend services and APIs using TypeScript, Node and AWS, also with some Python work for LLM integration. You'll take ownership of projects, working across the full development lifecycle from requirements through to delivery and help to drive the adoption of AI within the development lifecycle. There's a remote first policy so you can work from home on a fulltime basis with the caveat that you'll meet up with the team in London once a month (expenses paid); there's also flexible working h
        Backend Software Engineer / Developer (TypeScript Node AWS) Remote to £85k - Are you a backend focussed Software Engineer looking for an opportunity to progress your career, whilst working remotely on a modern tech stack? You could be joining a scaling AI software solutions provider in a senior, hands-on role. As a Backend Software Engineer you will build new features with a focus on backend services and APIs using TypeScript, Node and AWS, also with some Python work for LLM integration. You'll take ownership of projects, working across the full development lifecycle from requirements through to delivery and help to drive the adoption of AI within the development lifecycle. There's a remote first policy so you can work from home on a fulltime basis with the caveat that you'll meet up with the team in London once a month (expenses paid); there's also flexible working h
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        Frequently Asked Questions

        How many contract API jobs are there in Chertsey?
        There are 51 contract API jobs within 20 miles of Chertsey available on CWJobs right now.

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