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        Last 14 days
        479

        90 Contract API jobs in Central London + 20 miles

        389 exact matches jobs are outside your preferred location

        AI Engineer

        Circle Group
        London
        £700 - £850 per day
        Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
        Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
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        NEW
        We employ a micro front-end (MFE) architecture on the web, and agentic workflows with API-first services behind it, to integrate risk insights seamlessly across workflows and surfaces. * Design, develop, and operate secure, scalable APIs/microservices in Python (FastAPI) or Java (Spring Boot), following API-first principles * Experience building and consuming APIs; strong grasp of REST/gRPC and API
        We employ a micro front-end (MFE) architecture on the web, and agentic workflows with API-first services behind it, to integrate risk insights seamlessly across workflows and surfaces. * Design, develop, and operate secure, scalable APIs/microservices in Python (FastAPI) or Java (Spring Boot), following API-first principles * Experience building and consuming APIs; strong grasp of REST/gRPC and API
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        NEW
        Experience in data engineering, modelling and API design, ensuring scalable and reusable data structures * Experience creating and contributing to key data architecture artefacts, including ERDs, semantic layer designs, data flow documentation, API specs and metadata management
        Experience in data engineering, modelling and API design, ensuring scalable and reusable data structures * Experience creating and contributing to key data architecture artefacts, including ERDs, semantic layer designs, data flow documentation, API specs and metadata management
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        NEW
        Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
        Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
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        NEW
        Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months - Start: ASAP - Hybrid: 3 days on site per week - My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and delivery of Gen AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams, and AI specialists to develop LLM AI-powered applications, ensuring their scalability, security, observability and performance.
        Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months - Start: ASAP - Hybrid: 3 days on site per week - My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and delivery of Gen AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams, and AI specialists to develop LLM AI-powered applications, ensuring their scalability, security, observability and performance.
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        Support an API-FIRST Analytics business strategy to design and build SaaS and PaaS solutions, including analytics data solutions, quantitative models, risk analytics and customized reporting tools, and other sophisticated analytical tools. * Experience leading/designing/delivering API service-based product solutions
        Support an API-FIRST Analytics business strategy to design and build SaaS and PaaS solutions, including analytics data solutions, quantitative models, risk analytics and customized reporting tools, and other sophisticated analytical tools. * Experience leading/designing/delivering API service-based product solutions
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        Senior Data Architect

        Cambridge University Press & Assessment
        CB2, Cambridge, CB2 8BS
        From £70,400 to £94,100 per annum
        Job Title:Senior Data Architect - Salary:£70,400 - £94,100 - Location:Cambridge/Hybrid with office attendance for an average of 2 days a week - Contract:Permanent - Shape the future of data and AI at Cambridge University Press & Assessment - We are Cambridge University Press & Assessment, a world-leading academic publisher and assessment organisation and a proud part of the University of Cambridge. About the role - As a SeniorData Architect, you will play a pivotal role in delivering a coherent and scalable data framework aligned with our enterprise data strategy. You'll advance key architectural principles such as data mesh, data products, and data contracts, while enabling the strategic use of Artificial Intelligence (AI) and Generative AI (GenAI) across the organisation. You'll beresponsible for promoting the data strategy, securing stakeholder buy-in, and defining
        Job Title:Senior Data Architect - Salary:£70,400 - £94,100 - Location:Cambridge/Hybrid with office attendance for an average of 2 days a week - Contract:Permanent - Shape the future of data and AI at Cambridge University Press & Assessment - We are Cambridge University Press & Assessment, a world-leading academic publisher and assessment organisation and a proud part of the University of Cambridge. About the role - As a SeniorData Architect, you will play a pivotal role in delivering a coherent and scalable data framework aligned with our enterprise data strategy. You'll advance key architectural principles such as data mesh, data products, and data contracts, while enabling the strategic use of Artificial Intelligence (AI) and Generative AI (GenAI) across the organisation. You'll beresponsible for promoting the data strategy, securing stakeholder buy-in, and defining
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        NEWFEATURED
        Join Us as a Software Development Engineer in Test (SDET)! Overview - We are looking for a Software Development Engineer in Test (SDET) or automation tester who comes from a Java Software Development background. The role is to assist in the development of the new Index platform for the FTSE-Russell Index business of the London Stock Exchange Group (LSEG). The Index Platform team performs the calculation, maintenance and distribution of Index products. You will be working on innovative technologies with a team of engineers to implement solutions which support the strategic growth of the Index business. You will be involved in the development of complex test tools and solutions as well as new test frameworks, starting from a blank slate in some cases, to help ensure the quality of a greenfield application build.
        Join Us as a Software Development Engineer in Test (SDET)! Overview - We are looking for a Software Development Engineer in Test (SDET) or automation tester who comes from a Java Software Development background. The role is to assist in the development of the new Index platform for the FTSE-Russell Index business of the London Stock Exchange Group (LSEG). The Index Platform team performs the calculation, maintenance and distribution of Index products. You will be working on innovative technologies with a team of engineers to implement solutions which support the strategic growth of the Index business. You will be involved in the development of complex test tools and solutions as well as new test frameworks, starting from a blank slate in some cases, to help ensure the quality of a greenfield application build.
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        MERITUS are working with a large consulting organisation looking for a Senior Java Developer on a project working into a UK Central Government client. You'll play a key role in designing, coding, reviewing, and testing solutions within the Java stack, collaborating with developers, testers, and DevOps engineers. The position also involves working on automated tests, infrastructure updates, and maintaining high-quality standards across all stages of development. The role is remote with monthly visits into the London office on an initial 6 Month contract. * Design, code, review, and unit test applications using the Java stack. * Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. * Support and enhance legacy systems currently in maintenance mode. * Contribute to automated testing (C#) and infrastructure improvements (Docker, Ans
        MERITUS are working with a large consulting organisation looking for a Senior Java Developer on a project working into a UK Central Government client. You'll play a key role in designing, coding, reviewing, and testing solutions within the Java stack, collaborating with developers, testers, and DevOps engineers. The position also involves working on automated tests, infrastructure updates, and maintaining high-quality standards across all stages of development. The role is remote with monthly visits into the London office on an initial 6 Month contract. * Design, code, review, and unit test applications using the Java stack. * Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. * Support and enhance legacy systems currently in maintenance mode. * Contribute to automated testing (C#) and infrastructure improvements (Docker, Ans
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        Position: AI Engineer / AI Agent / Backend AI Engineer - Location: Remote - Work Type: Contract - We're looking for an AI Engineer to design and deliver scalable AI/ML systems and agentic applications. You'll work on LLMs, RAG pipelines, model deployment, and cloud-native solutions that drive real-world impact. * Strong coding skills in Java / TypeScript /Python * Experience with LLMs, NLP, and ML frameworks (Hugging Face, PyTorch, TensorFlow, LangChain) * Cloud & DevOps expertise (AWS/Azure, Docker, Kubernetes, CI/CD pipelines) * Knowledge of microservices, APIs, distributed systems - Why join us? * Work on cutting-edge AI innovation * Collaborative, cross-functional environment * Competitive salary + growth opportunities - We encourage you to apply or send me your updated resume to nandiraju . b @ randstad . co. uk
        Position: AI Engineer / AI Agent / Backend AI Engineer - Location: Remote - Work Type: Contract - We're looking for an AI Engineer to design and deliver scalable AI/ML systems and agentic applications. You'll work on LLMs, RAG pipelines, model deployment, and cloud-native solutions that drive real-world impact. * Strong coding skills in Java / TypeScript /Python * Experience with LLMs, NLP, and ML frameworks (Hugging Face, PyTorch, TensorFlow, LangChain) * Cloud & DevOps expertise (AWS/Azure, Docker, Kubernetes, CI/CD pipelines) * Knowledge of microservices, APIs, distributed systems - Why join us? * Work on cutting-edge AI innovation * Collaborative, cross-functional environment * Competitive salary + growth opportunities - We encourage you to apply or send me your updated resume to nandiraju . b @ randstad . co. uk
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        NEWFEATURED
        we are hiring forTechnical Data Architect - location: Central London - Type : Permanent - Hybrid role (2-3 days from client location) We are seeking a highly skilled TechnicalData Architect- with expertise in Databricks, PySpark, and modern data engineering practices. The ideal candidate will lead the design, development, and optimization of scalable data pipelines, while ensuring data accuracy, consistency, and performance across the enterprise Lakehouse platform. This role requires strong leadership, technical depth, and the ability to collaborate with cross-functional teams. Key Responsibilities - Lead the design, development, and maintenance of scalable, high-performance data pipelines on Databricks. Architect and implement data ingestion, transformation, and integration workflows using PySpark, SQL, and Delta Lake.
        we are hiring forTechnical Data Architect - location: Central London - Type : Permanent - Hybrid role (2-3 days from client location) We are seeking a highly skilled TechnicalData Architect- with expertise in Databricks, PySpark, and modern data engineering practices. The ideal candidate will lead the design, development, and optimization of scalable data pipelines, while ensuring data accuracy, consistency, and performance across the enterprise Lakehouse platform. This role requires strong leadership, technical depth, and the ability to collaborate with cross-functional teams. Key Responsibilities - Lead the design, development, and maintenance of scalable, high-performance data pipelines on Databricks. Architect and implement data ingestion, transformation, and integration workflows using PySpark, SQL, and Delta Lake.
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        NEWFEATURED

        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
        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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        NEWFEATURED

        Software Developer C#

        Platform Recruitment Limited
        Reading, Berkshire
        Unspecified
        Title:Software Developer - Location:Berkshire - Work Model:Hybrid - Were partnering with a European technology company that provides secure connectivity and data solutions across multiple sectors. Theyre looking to bring a Software Developer into their expanding team. Youll work closely with other developers and support staff, helping to develop and support a new C# communications platform. This platform is responsible for the aggregation, transformation, and delivery of critical alarm signals. Key Responsibilities - Create and maintain APIs for platform management -Actively participate in an Agile development team -Conduct testing, verification, and troubleshooting -Provide 3rd-line support to 1st-line support teams -Ensure compliance with industry standards and regulations in software designs -Document design specifications, test procedures, and project updates - Ke
        Title:Software Developer - Location:Berkshire - Work Model:Hybrid - Were partnering with a European technology company that provides secure connectivity and data solutions across multiple sectors. Theyre looking to bring a Software Developer into their expanding team. Youll work closely with other developers and support staff, helping to develop and support a new C# communications platform. This platform is responsible for the aggregation, transformation, and delivery of critical alarm signals. Key Responsibilities - Create and maintain APIs for platform management -Actively participate in an Agile development team -Conduct testing, verification, and troubleshooting -Provide 3rd-line support to 1st-line support teams -Ensure compliance with industry standards and regulations in software designs -Document design specifications, test procedures, and project updates - Ke
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        Lead Backend Developer - Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
        Lead Backend Developer - Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
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        .NET Developer

        IMPACTIVE IT RECRUITMENT LTD
        London
        From £55,000 to £85,000 per annum
        Impactive ITare currently working with a fantastic organisation with big growth targets to hit before the end of the year. We are on the hunt for a AI .NET Developer who will be playing a key role in designing, developing innovate solutions leveraging the use of AI. Core Skills and Experience - Strong commercial experience in .NET development and implementing AI-based applications. - Comfortable using AI and automation frameworks to improve developer productivity. - Experienced in code reviews, quality checks, and pull requests within collaborative projects. - Able to contribute across the full software development lifecycle, from concept and design to delivery and support. - Skilled at translating business requirements into scalable and efficient technical solutions. - Capable of estimating workload and development effort for new builds and enhancements.
        Impactive ITare currently working with a fantastic organisation with big growth targets to hit before the end of the year. We are on the hunt for a AI .NET Developer who will be playing a key role in designing, developing innovate solutions leveraging the use of AI. Core Skills and Experience - Strong commercial experience in .NET development and implementing AI-based applications. - Comfortable using AI and automation frameworks to improve developer productivity. - Experienced in code reviews, quality checks, and pull requests within collaborative projects. - Able to contribute across the full software development lifecycle, from concept and design to delivery and support. - Skilled at translating business requirements into scalable and efficient technical solutions. - Capable of estimating workload and development effort for new builds and enhancements.
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        NEW
        We are looking for a motivated and detail-oriented Software Engineer to join our development team. You will have hands-on experience with Java development, Spring framework, relational databases, and a strong desire to grow their technical skills while contributing to Cegeka software solutions. Responsibilities * Design, develop, test, and maintain Java-based applications using the Spring framework. * Write efficient, reliable, and maintainable code that adheres to best practices. * Work with SQL databases (e.g., MySQL, PostgreSQL, Oracle) to design schemas, write queries, and optimise performance. * Collaborate with senior engineers to implement new features and fix bugs. * Participate in code reviews and contribute to improving coding standards. * Assist in troubleshooting, debugging, and performance tuning of applications.
        We are looking for a motivated and detail-oriented Software Engineer to join our development team. You will have hands-on experience with Java development, Spring framework, relational databases, and a strong desire to grow their technical skills while contributing to Cegeka software solutions. Responsibilities * Design, develop, test, and maintain Java-based applications using the Spring framework. * Write efficient, reliable, and maintainable code that adheres to best practices. * Work with SQL databases (e.g., MySQL, PostgreSQL, Oracle) to design schemas, write queries, and optimise performance. * Collaborate with senior engineers to implement new features and fix bugs. * Participate in code reviews and contribute to improving coding standards. * Assist in troubleshooting, debugging, and performance tuning of applications.
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        NEW
        Happy to look at European relocators - An Edtech Start-up in London are building something transformative in the education space using cutting-edge machine learning. We're looking for aLead ML Engineerto take ownership of the machine learning strategy, build out the team, and help shape the future of AI in education. * Build and lead a new ML team from the ground up. * Define the tech stack for data pipelines and ML models. * Develop generative models using diverse datasets (text, audio, video, test results). * Design and deploy data integration and analysis pipelines. * Collaborate with engineers and product managers to bring ML features to life. * Create innovative language assessments and predictive models. * Optimize models for performance, scalability, and accuracy. * Deep knowledge of neural networks (CNNs, RNNs, LSTMs, Transformers).
        Happy to look at European relocators - An Edtech Start-up in London are building something transformative in the education space using cutting-edge machine learning. We're looking for aLead ML Engineerto take ownership of the machine learning strategy, build out the team, and help shape the future of AI in education. * Build and lead a new ML team from the ground up. * Define the tech stack for data pipelines and ML models. * Develop generative models using diverse datasets (text, audio, video, test results). * Design and deploy data integration and analysis pipelines. * Collaborate with engineers and product managers to bring ML features to life. * Create innovative language assessments and predictive models. * Optimize models for performance, scalability, and accuracy. * Deep knowledge of neural networks (CNNs, RNNs, LSTMs, Transformers).
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        NEW
        World Wide Technology (WWT), a global technology integrator and IT solutions provider. World Wide Technology, established in 1990 in St. Louis, Missouri, collaborates with OEMs like Cisco and Dell EMC to offer infrastructure security and custom app development services to Fortune 500 companies in various sectors. With over 10,000 employees globally, we generate $17 billion in annual revenue and operate in regions including the US, UK, Canada, Europe, Costa Rica, APAC, and Middle East. We're proud to be consistently recognized as a top employer by Fortune and Glassdoor for over 13 years. World Wide Technology Holding Co, LLC (WWT) has an opportunity for a AI Platform Operations Manager. Below is the JD for the role. Please help me with the information needed to process your application, and I will contact you to discuss the role. This is a contract Role & Outside IR35
        World Wide Technology (WWT), a global technology integrator and IT solutions provider. World Wide Technology, established in 1990 in St. Louis, Missouri, collaborates with OEMs like Cisco and Dell EMC to offer infrastructure security and custom app development services to Fortune 500 companies in various sectors. With over 10,000 employees globally, we generate $17 billion in annual revenue and operate in regions including the US, UK, Canada, Europe, Costa Rica, APAC, and Middle East. We're proud to be consistently recognized as a top employer by Fortune and Glassdoor for over 13 years. World Wide Technology Holding Co, LLC (WWT) has an opportunity for a AI Platform Operations Manager. Below is the JD for the role. Please help me with the information needed to process your application, and I will contact you to discuss the role. This is a contract Role & Outside IR35
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        NEW

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        show more

        What is the average salary for API in Central London?

        Average salary per year
        £77,499

        The average salary for a API in Central London is £77,499. API in Central London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many contract API jobs are there in Central London?
        There are 90 contract API jobs within 20 miles of Central London available on CWJobs right now.

        Where in Central London are these contract jobs?
        You can find contract jobs in Charing Cross, Holborn, Mayfair.

        What other similar jobs are there to contract API jobs in Central London?
        As well as contract API jobs in Central London, you can find contract Cyber Security, Implementation, IT, amongst many others.