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        101 Contract API jobs in Mayfair + 20 miles

        Senior Salesforce Developer

        167 Solutions Ltd
        SW1, South West London
        From £75,000 to £90,000 per annum
        Senior Salesforce Consultant / Senior Salesforce Developer / Senior Salesforce Programmer - Location: Hybrid (London / UK 23 days onsite) Salary: £75,000 - £90,000 Plus Benefits - We are hiring on behalf of our client for a Senior Salesforce Consultant to play a key role in an exciting organisation-wide Salesforce transformation. This role offers the opportunity to work across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud in a collaborative hybrid environment. Key Responsibilities * Lead end-to-end delivery across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud, from requirements gathering and solution design to configuration, development, testing, and deployment. * Deliver technical solutions in Salesforce including custom metadata, Lightning components, Apex code, APIs, and declarative automation.
        Senior Salesforce Consultant / Senior Salesforce Developer / Senior Salesforce Programmer - Location: Hybrid (London / UK 23 days onsite) Salary: £75,000 - £90,000 Plus Benefits - We are hiring on behalf of our client for a Senior Salesforce Consultant to play a key role in an exciting organisation-wide Salesforce transformation. This role offers the opportunity to work across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud in a collaborative hybrid environment. Key Responsibilities * Lead end-to-end delivery across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud, from requirements gathering and solution design to configuration, development, testing, and deployment. * Deliver technical solutions in Salesforce including custom metadata, Lightning components, Apex code, APIs, and declarative automation.
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        Senior Backend Engineer

        Ncounter LTD
        W1, Central London
        From £120,000 to £160,000 per annum Equity and package
        Product-Focused Backend Engineer Functional Programming & Distributed Systems - London (Hybrid) | £120,000£160,000 + Equity - At Ncounter, were partnering with a cutting-edge AI company on a mission to redefine how professionals in highly regulated industries interact with complex, multi-modal data. Their platform empowers users to deploy custom no-code AI agents that produce verifiable outputs with full transparency - ensuring trust, compliance, and control remain central to every decision. As a Backend Engineer, youll join a growing team working at the forefront of AI infrastructure. This isnt just about clean code or strong delivery - its about ownership, product intuition, and building for scale. Youll be part of a lean, high-calibre engineering function where every member contributes to planning, testing, analysis, and execution.
        Product-Focused Backend Engineer Functional Programming & Distributed Systems - London (Hybrid) | £120,000£160,000 + Equity - At Ncounter, were partnering with a cutting-edge AI company on a mission to redefine how professionals in highly regulated industries interact with complex, multi-modal data. Their platform empowers users to deploy custom no-code AI agents that produce verifiable outputs with full transparency - ensuring trust, compliance, and control remain central to every decision. As a Backend Engineer, youll join a growing team working at the forefront of AI infrastructure. This isnt just about clean code or strong delivery - its about ownership, product intuition, and building for scale. Youll be part of a lean, high-calibre engineering function where every member contributes to planning, testing, analysis, and execution.
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        IT Business Analyst

        Octad Recruitment Consultants (Octad Ltd )
        BR1, Bromley
        From £40,000 to £60,000 per annum Good Benefits
        This vibrant and expanding company are looking for a Business Analyst to work closely with the CEO in this exciting phase of their expansion. , The Company is an end-to-end digital solution organisation. They are looking for an experienced Business Analyst to join theirteam. In this role, youll be the bridge between business needs and technical solutions - gathering requirements, analyzing processes, and delivering actionable insights that help guide product development and business strategy. The development team are based overseas in South Africa and Thailand, with the CTO and a systems manager/UAT person being the only UK based part of the team. This role is key in that it will be a senior and key member of the development team which will include architecture and strategy decisions. Collaborate with stakeholders to gather and define business requirements
        This vibrant and expanding company are looking for a Business Analyst to work closely with the CEO in this exciting phase of their expansion. , The Company is an end-to-end digital solution organisation. They are looking for an experienced Business Analyst to join theirteam. In this role, youll be the bridge between business needs and technical solutions - gathering requirements, analyzing processes, and delivering actionable insights that help guide product development and business strategy. The development team are based overseas in South Africa and Thailand, with the CTO and a systems manager/UAT person being the only UK based part of the team. This role is key in that it will be a senior and key member of the development team which will include architecture and strategy decisions. Collaborate with stakeholders to gather and define business requirements
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        Technical Business Analyst

        Ncounter LTD
        EC1, City of London
        From £120,000 to £150,000 per annum Bonus and package
        Ncounter is hiring a hybrid Technical Business Analyst / Project Manager to join a high-performance technology team delivering complex trading solutions across global markets. Youll play a pivotal role in shaping products that underpin real-time financial decision-making, working across engineering, research, and infrastructure groups. Whether your strengths lie in requirements analysis or delivery management, this role offers the chance to influence business-critical systems in a high-frequency trading environment. Where youll make an impact - Youll either join the analysis team, acting as the key translator between business goals and technical implementation, or take the reins on end-to-end project deliverydepending on your expertise and focus. * Capture and refine detailed business and technical requirements * Translate complex problems into structured, executable
        Ncounter is hiring a hybrid Technical Business Analyst / Project Manager to join a high-performance technology team delivering complex trading solutions across global markets. Youll play a pivotal role in shaping products that underpin real-time financial decision-making, working across engineering, research, and infrastructure groups. Whether your strengths lie in requirements analysis or delivery management, this role offers the chance to influence business-critical systems in a high-frequency trading environment. Where youll make an impact - Youll either join the analysis team, acting as the key translator between business goals and technical implementation, or take the reins on end-to-end project deliverydepending on your expertise and focus. * Capture and refine detailed business and technical requirements * Translate complex problems into structured, executable
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        Full Stack Developer Node.Js / React

        Halian Technology Limited
        W1, Central London
        From £60,000 to £65,000 per annum Plus bonus and benefits
        My client specialises in digital payments across the UK and Europe. Their platform enables seamless real-time transactions for consumers and businesses, with a focus on security, scalability, and user experience. Backed by top-tier investors and used by thousands daily, were scaling up and looking for passionate engineers to help us build the future of payments. We are seeking a talented and driven Mid-Level Full Stack Engineer with strong skills in Node.js, React, and AWS cloud infrastructure. Youll play a key role in designing, developing, and maintaining scalable microservices and user interfaces for our core payments platform. Youll work in a cross-functional agile team alongside product managers, designers, and fellow engineers to deliver features that directly impact our customers and partners. * Develop backend microservices using Node.js (Express/Nest.js prefe
        My client specialises in digital payments across the UK and Europe. Their platform enables seamless real-time transactions for consumers and businesses, with a focus on security, scalability, and user experience. Backed by top-tier investors and used by thousands daily, were scaling up and looking for passionate engineers to help us build the future of payments. We are seeking a talented and driven Mid-Level Full Stack Engineer with strong skills in Node.js, React, and AWS cloud infrastructure. Youll play a key role in designing, developing, and maintaining scalable microservices and user interfaces for our core payments platform. Youll work in a cross-functional agile team alongside product managers, designers, and fellow engineers to deliver features that directly impact our customers and partners. * Develop backend microservices using Node.js (Express/Nest.js prefe
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        Product Manager - Post Trade

        SG Technology
        EC1A, City of London
        £90,000 per annum Plus Bonus & Benefits
        My client, a leading global investment bank, is seeking an experienced Product Manager to - position technology as a strategic asset and to shape how a growing product organisation - supports worldwide business growth. Reporting to the Lead Product Manager for Investments, the successful candidate will own the alignment and product development of the banks - investment-operations proposition, covering custody, IBOR, ABOR, trade capture, dealing and - settlements across multiple asset classes. Working within a long-standing Agile team, the - Product Manager will integrate and modernise critical post-trade platforms, delivering innovative, scalable solutions while cultivating a strong partnership between technology and the global - business. Key Responsibilities * Serve as subject-matter expert for engineering teams and third-party vendors, ensuringclarity around delive
        My client, a leading global investment bank, is seeking an experienced Product Manager to - position technology as a strategic asset and to shape how a growing product organisation - supports worldwide business growth. Reporting to the Lead Product Manager for Investments, the successful candidate will own the alignment and product development of the banks - investment-operations proposition, covering custody, IBOR, ABOR, trade capture, dealing and - settlements across multiple asset classes. Working within a long-standing Agile team, the - Product Manager will integrate and modernise critical post-trade platforms, delivering innovative, scalable solutions while cultivating a strong partnership between technology and the global - business. Key Responsibilities * Serve as subject-matter expert for engineering teams and third-party vendors, ensuringclarity around delive
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        .Net Developer - Hybrid Remote

        VERTECH GROUP (UK) LTD
        KT14, West Byfleet
        From £55,000 to £65,000 per annum + Benefits
        .Net Developer Location: Flexible Hybrid Home / Byfleet Salary: Circa 55k 65k + Benefits .Net Developer required by fast-growing, technology-led company! This is a diverse, challenging role in a talented team where youll be responsible for developing a variety of complex projects * At least 3yrs development experience * Skills in C#, VB.Net * ASP.Net, Blazor, WPF * RESTful APIs Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to keep up to date with emerging technologies and enjoy a healthy work/life balance! Apply now for FULL details!
        .Net Developer Location: Flexible Hybrid Home / Byfleet Salary: Circa 55k 65k + Benefits .Net Developer required by fast-growing, technology-led company! This is a diverse, challenging role in a talented team where youll be responsible for developing a variety of complex projects * At least 3yrs development experience * Skills in C#, VB.Net * ASP.Net, Blazor, WPF * RESTful APIs Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to keep up to date with emerging technologies and enjoy a healthy work/life balance! Apply now for FULL details!
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        FEATURED

        Business Analyst

        OpenSourced Ltd
        SW1, South West London
        From £40,000 to £55,000 per annum
        Are you a skilled Business Analyst with eCommerce experience looking to make a real impact? Want to work with big-name fashion, luxury, and homeware brands on cutting-edge digital projects? This leading London-based digital agency is growing fast and theyre looking for a talented Business Analyst to join their collaborative and forward-thinking team. This is your opportunity to shape the future of award-winning eCommerce websites. What Youll Be Doing - As a Business Analyst, youll help deliver high-performing eCommerce platforms by working across the full project lifecycle. Youll work alongside Project Managers, developers, designers, and Senior Business Analysts to define and deliver solutions that delight clients. * Gathering and refining client business requirements * Translating briefs into user stories with clear acceptance criteria
        Are you a skilled Business Analyst with eCommerce experience looking to make a real impact? Want to work with big-name fashion, luxury, and homeware brands on cutting-edge digital projects? This leading London-based digital agency is growing fast and theyre looking for a talented Business Analyst to join their collaborative and forward-thinking team. This is your opportunity to shape the future of award-winning eCommerce websites. What Youll Be Doing - As a Business Analyst, youll help deliver high-performing eCommerce platforms by working across the full project lifecycle. Youll work alongside Project Managers, developers, designers, and Senior Business Analysts to define and deliver solutions that delight clients. * Gathering and refining client business requirements * Translating briefs into user stories with clear acceptance criteria
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        Golang Engineer

        Ncounter LTD
        SE1, South East London
        From £700 to £800 per day Inside IR35
        Contract Golang Engineer AI for Defence £700800/day | Inside IR35 | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Initial 3-month contract (extensions expected up to 12 months) Join a ground-breaking AI programme delivering national security impact. Were working with a leading UK AI firm on a mission-critical Defence deployment. This greenfield build calls for a Golang specialist to help deliver backend systems that support real-time inference, transcription pipelines, and natural language interaction all under tight performance and security constraints. * Build high-performance services using Golang in secure environments * Develop ingestion and processing pipelines for transcription and structured/unstructured data * Contribute to intelligent data flows including graph-based and RAG inference pipelines
        Contract Golang Engineer AI for Defence £700800/day | Inside IR35 | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Initial 3-month contract (extensions expected up to 12 months) Join a ground-breaking AI programme delivering national security impact. Were working with a leading UK AI firm on a mission-critical Defence deployment. This greenfield build calls for a Golang specialist to help deliver backend systems that support real-time inference, transcription pipelines, and natural language interaction all under tight performance and security constraints. * Build high-performance services using Golang in secure environments * Develop ingestion and processing pipelines for transcription and structured/unstructured data * Contribute to intelligent data flows including graph-based and RAG inference pipelines
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        Guidewire Developer

        Pioneer Search
        City of London, London
        £55000.00 - £65000.00 per annum
        Location: London / Hybrid (2 days in the office, 3 days from home) Salary: £55,000 - £65,000 - A Guidewire developer is required for a leading Lloyd's of London Insurance organisation, implementing a Guidewire Claims system. This is to join a brand-new team onboarding and implementing a Guidewire Claims system. You will have experience working with Guidewire, across either PolicyCenter BillingCenter or ClaimsCenter. As this is an initial migration and implementation you will be essential in assisting the organisation migrate from their existing claims platform to Claims Center which will be hosted in Guidewires Cloud. Ability to interact with stakeholders and to be involved in decisions affecting the implementation due to go live in 2026 is essential. You will have experience customising Guidewire in Gosu.
        Location: London / Hybrid (2 days in the office, 3 days from home) Salary: £55,000 - £65,000 - A Guidewire developer is required for a leading Lloyd's of London Insurance organisation, implementing a Guidewire Claims system. This is to join a brand-new team onboarding and implementing a Guidewire Claims system. You will have experience working with Guidewire, across either PolicyCenter BillingCenter or ClaimsCenter. As this is an initial migration and implementation you will be essential in assisting the organisation migrate from their existing claims platform to Claims Center which will be hosted in Guidewires Cloud. Ability to interact with stakeholders and to be involved in decisions affecting the implementation due to go live in 2026 is essential. You will have experience customising Guidewire in Gosu.
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        Senior Software Engineer C# .Net - Asset Manager

        Client Server
        The City, EC4
        £100000 - £150000 per annum + bonus + benefits
        There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js.
        There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js.
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        NEWPREMIUM
        5+ years experience in working with the .NET framework, particularly with ASP.NET Core, React/React Native, C#, Web API Experience developing REST API-driven mobile first web applications
        5+ years experience in working with the .NET framework, particularly with ASP.NET Core, React/React Native, C#, Web API Experience developing REST API-driven mobile first web applications
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        NEW

        Full Stack Lead Engineer

        Hunter Selection
        Soho, W1
        £60000 - £85000 per annum + health insurance life insurance
        Restful API development - React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code | React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code | React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code
        Restful API development - React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code | React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code | React | TypeScript | NodeJS | AWS | Event driven Architecture | CDK | Lambda | Cognito | S3 | SQS | Eventbridge | Restful API | API | SQL | NoSQL | messaging queues | WebSockets | DevOps | CI/CD | GitHub | WebAssembly | Infrastructure as Code
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        NEWFEATURED
        About Us - With Intelligence is a leading provider of data and insights for the global asset management industry. We are scaling up our technological capabilities, harnessing the power of advanced data systems, AI, and modern cloud-based infrastructure to build a flexible, event-driven platform that supports our growing suite of digital products. We're assembling a top-tier London-based engineering team to lead this transformation. This role offers the opportunity to be a key contributor to our technology evolution, leveraging your deep .NET experience to influence product direction, mentor teams, and ensure our systems are robust, scalable, and modern. Role Overview - As a .Net Specialist you will be leading teams in the design, development, and implementation of software solutions using the .NET framework. You will act as a technical authority across multiple produc
        About Us - With Intelligence is a leading provider of data and insights for the global asset management industry. We are scaling up our technological capabilities, harnessing the power of advanced data systems, AI, and modern cloud-based infrastructure to build a flexible, event-driven platform that supports our growing suite of digital products. We're assembling a top-tier London-based engineering team to lead this transformation. This role offers the opportunity to be a key contributor to our technology evolution, leveraging your deep .NET experience to influence product direction, mentor teams, and ensure our systems are robust, scalable, and modern. Role Overview - As a .Net Specialist you will be leading teams in the design, development, and implementation of software solutions using the .NET framework. You will act as a technical authority across multiple produc
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        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
        more
        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. Gravitee.io is taking APIs to the next level we are the premier, open source API platform and we want everyone to know how amazing our software is. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. Gravitee.io is taking APIs to the next level we are the premier, open source API platform and we want everyone to know how amazing our software is. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
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        This is your opportunity to join AXIS Capital a trusted global provider of specialty lines insurance and reinsurance. We stand apart for our outstanding client service, intelligent risk taking and superior risk adjusted returns for our shareholders. We also proudly maintain an entrepreneurial, disciplined and ethical corporate culture. As a member of AXIS, you join a team that is among the best in the industry. At AXIS, we believe that we are only as strong as our people. We strive to create an inclusive and welcoming culture where employees of all backgrounds and from all walks of life feel comfortable and empowered to be themselves. This means that we bring our whole selves to work. All qualified applicants will receive consideration for employment without regard to race, color, religion or creed, sex, pregnancy, sexual orientation, gender identity or expression, na
        This is your opportunity to join AXIS Capital a trusted global provider of specialty lines insurance and reinsurance. We stand apart for our outstanding client service, intelligent risk taking and superior risk adjusted returns for our shareholders. We also proudly maintain an entrepreneurial, disciplined and ethical corporate culture. As a member of AXIS, you join a team that is among the best in the industry. At AXIS, we believe that we are only as strong as our people. We strive to create an inclusive and welcoming culture where employees of all backgrounds and from all walks of life feel comfortable and empowered to be themselves. This means that we bring our whole selves to work. All qualified applicants will receive consideration for employment without regard to race, color, religion or creed, sex, pregnancy, sexual orientation, gender identity or expression, na
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        MMC Corporate - We are looking for a talented and motivated individual to join our Cloud Platforms team at Marsh McLennan, based in Liverpool, United Kingdom. This is a hybrid role, requiring a minimum of three days per week in the office. * Operational Support for public cloud technology solutions, primarily focused on the AWS or Azure cloud platforms. * Obtain and maintain an in-depth understanding of AWS and Azure public cloud technologies to ensure all appropriate options are considered to support business initiatives. * Act as a consultant and subject matter expert for Project Managers, Developers, and Engineering teams, to resolve technical obstacles and improve the product's vision. * Work closely with multiple Project Management and Software Engineering teams on understanding ways to improve IaaS and PaaS service offerings.
        MMC Corporate - We are looking for a talented and motivated individual to join our Cloud Platforms team at Marsh McLennan, based in Liverpool, United Kingdom. This is a hybrid role, requiring a minimum of three days per week in the office. * Operational Support for public cloud technology solutions, primarily focused on the AWS or Azure cloud platforms. * Obtain and maintain an in-depth understanding of AWS and Azure public cloud technologies to ensure all appropriate options are considered to support business initiatives. * Act as a consultant and subject matter expert for Project Managers, Developers, and Engineering teams, to resolve technical obstacles and improve the product's vision. * Work closely with multiple Project Management and Software Engineering teams on understanding ways to improve IaaS and PaaS service offerings.
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        Frequently Asked Questions

        How many contract API jobs are there in Mayfair?
        There are 101 contract API jobs within 20 miles of Mayfair available on CWJobs right now.

        Where in Mayfair are these contract jobs?
        You can find contract jobs in Shadwell, The City, City (EC3), Frimley.

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