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        13 API jobs in Mayfair + 20 miles

        GraphQL Engineer

        Staffworx Limited
        W10, West London
        market rates, outside IR35, 6 months initial, long term extensions
        Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
        Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
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        Microsoft Power Platform / Agentic AI Engineer

        cer Financial
        EC2M, City of London
        £705 per day £705 per day (via Umbrella)
        Microsoft 365 & Graph API Integration * Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
        Microsoft 365 & Graph API Integration * Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
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        FEATURED
        Adopt a "shift-left" approachby designing and implementing performance tests at the API, component, and integration levels, not just at the UI/E2E level.
        Adopt a "shift-left" approachby designing and implementing performance tests at the API, component, and integration levels, not just at the UI/E2E level.
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        NEWFEATURED
        API & Backend Integration: Partner with our backend (Application & AI Orchestration) engineers to define and integrate the client-side APIs and data models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries.
        API & Backend Integration: Partner with our backend (Application & AI Orchestration) engineers to define and integrate the client-side APIs and data models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries.
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        AI Solutions Engineer

        McGregor Boyall Associates Limited
        Mayfair, W1H 6DU
        £50000 - £75000 per annum
        £50,000 - £75,000 DOE | Full-time, on-site | Start: ASAP - Join a global logistics company that's embracing the power of AI to transform the way it operates. This is an opportunity to be part of a forward-thinking team that's leveraging the latest in Large Language Models (LLMs) and automation to drive real business value. As an AI Solutions Engineer, you'll design, build, and implement intelligent automation solutions using cutting-edge AI technologies. Working closely with business stakeholders, you'll identify opportunities for innovation, prototype new ideas, and deliver scalable AI-driven systems that make a measurable impact. * Collaborating with business teams to uncover and define AI/automation opportunities. * Engineering and optimising prompts to ensure consistent, high-quality LLM outputs.
        £50,000 - £75,000 DOE | Full-time, on-site | Start: ASAP - Join a global logistics company that's embracing the power of AI to transform the way it operates. This is an opportunity to be part of a forward-thinking team that's leveraging the latest in Large Language Models (LLMs) and automation to drive real business value. As an AI Solutions Engineer, you'll design, build, and implement intelligent automation solutions using cutting-edge AI technologies. Working closely with business stakeholders, you'll identify opportunities for innovation, prototype new ideas, and deliver scalable AI-driven systems that make a measurable impact. * Collaborating with business teams to uncover and define AI/automation opportunities. * Engineering and optimising prompts to ensure consistent, high-quality LLM outputs.
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        NEW
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for job seekers and companies around the world to find a perfect match, in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job-tech platform. Your benefits - Were a community here that cares as much about your life outside work as how you feel when youre with us. Because your job shouldnt take over your life, it should enrich it. * 29 days holiday allowance + bank holidays * Private medical and dental healthcare * Pension contribution up to 10% * Training and development opportunities * Cycle to work scheme * In house Bari
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for job seekers and companies around the world to find a perfect match, in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job-tech platform. Your benefits - Were a community here that cares as much about your life outside work as how you feel when youre with us. Because your job shouldnt take over your life, it should enrich it. * 29 days holiday allowance + bank holidays * Private medical and dental healthcare * Pension contribution up to 10% * Training and development opportunities * Cycle to work scheme * In house Bari
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        NEW

        Salesforce QA Engineer

        Yolk Recruitment
        SM4, Morden
        £50000.00 - £60000.00 per annum + + excellent benefits
        Yolk Recruitment are working with a leading global organisation that continues to grow and invest in its Salesforce capability. Known for its collaborative culture and commitment to continuous improvement, this is an excellent opportunity for a Salesforce QA Tester to make a real impact within a forward-thinking technology team. We're looking for someone who's passionate about quality and experienced in ensuring Salesforce solutions meet the highest standards of reliability and performance. You'll work closely with cross-functional teams to test, validate, and optimise Salesforce functionality, integrations, and custom developments. * Collaborate with developers, business analysts, and project teams to understand requirements and define effective test strategies. * Perform thorough manual testing of Salesforce applications, identifying and documenting defects for ...
        Yolk Recruitment are working with a leading global organisation that continues to grow and invest in its Salesforce capability. Known for its collaborative culture and commitment to continuous improvement, this is an excellent opportunity for a Salesforce QA Tester to make a real impact within a forward-thinking technology team. We're looking for someone who's passionate about quality and experienced in ensuring Salesforce solutions meet the highest standards of reliability and performance. You'll work closely with cross-functional teams to test, validate, and optimise Salesforce functionality, integrations, and custom developments. * Collaborate with developers, business analysts, and project teams to understand requirements and define effective test strategies. * Perform thorough manual testing of Salesforce applications, identifying and documenting defects for ...
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        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description - Join our team and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with ov
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description - Join our team and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with ov
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        PREMIUM
        Position Overview - We are seeking a skilled Service Engineer to provide comprehensive production support for Oracle Revenue Management, Receivables, and Intercompany processes. This role requires both financial accounting expertise and technical troubleshooting capabilities to ensure revenue recognition compliance and seamless system operations. Key Responsibilities - Revenue Recognition & Compliance - Support ASC 606/IFRS 15 revenue recognition principles in production systems - Troubleshoot and maintain Revenue Contracts, Performance Obligations, and Standalone Selling Price (SSP) calculations - Resolve issues with Revenue Deferrals, Revenue Allocations, and Adjustments - Ensure revenue compliance through Multi-Currency and Multi-GAAP Reporting - Assist with Deferred Revenue and Unbilled Revenue Accruals processing - Receive, analyze, and prioritize related support
        Position Overview - We are seeking a skilled Service Engineer to provide comprehensive production support for Oracle Revenue Management, Receivables, and Intercompany processes. This role requires both financial accounting expertise and technical troubleshooting capabilities to ensure revenue recognition compliance and seamless system operations. Key Responsibilities - Revenue Recognition & Compliance - Support ASC 606/IFRS 15 revenue recognition principles in production systems - Troubleshoot and maintain Revenue Contracts, Performance Obligations, and Standalone Selling Price (SSP) calculations - Resolve issues with Revenue Deferrals, Revenue Allocations, and Adjustments - Ensure revenue compliance through Multi-Currency and Multi-GAAP Reporting - Assist with Deferred Revenue and Unbilled Revenue Accruals processing - Receive, analyze, and prioritize related support
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        Solutions Engineer

        Anson Mccade
        EC2, City of London, EC2V 6AA
        50,000 to 60,000 Annual
        £50,000 to 60,000 GBP - Bonus - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Location: London (Hybrid - 3 days in office: Tue/Wed/Thu) Salary: £50,000 to £60,000 + bonus and benefits - Type: Full-time, Permanent - Do you want to design and deliver solutions using the latest cloud services, AI, and emerging technologies to solve real-world challenges? This is a fantastic opportunity for an experienced engineer with a cloud-first mindset who thrives on creating innovative prototypes and scalable solutions. What you'll be doing * Designing and developing prototypes and Proof of Concepts using cloud services, AI, VR/AR, Edge AI, and more. * Supporting the delivery of group-wide digital initiatives, including in-house Generative AI solutions. * Collaborating with technical teams to promote best practices in modern software en
        £50,000 to 60,000 GBP - Bonus - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Location: London (Hybrid - 3 days in office: Tue/Wed/Thu) Salary: £50,000 to £60,000 + bonus and benefits - Type: Full-time, Permanent - Do you want to design and deliver solutions using the latest cloud services, AI, and emerging technologies to solve real-world challenges? This is a fantastic opportunity for an experienced engineer with a cloud-first mindset who thrives on creating innovative prototypes and scalable solutions. What you'll be doing * Designing and developing prototypes and Proof of Concepts using cloud services, AI, VR/AR, Edge AI, and more. * Supporting the delivery of group-wide digital initiatives, including in-house Generative AI solutions. * Collaborating with technical teams to promote best practices in modern software en
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        PREMIUM

        101 exact matches jobs are outside your preferred location

        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
        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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        About Revolut - People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products including spending, saving, investing, exchanging, travelling, and more help our 65+ million customers get more from their money every day. As we continue our lightning-fast growth,? 2 things are essential to our success: our people and our culture. In recognition of our outstanding employee experience, we've been certified as a Great Place to Work. So far, we have 10,000+ people working around the world, from our offices and remotely, to help us achieve our mission. And we're looking for more brilliant people. People who love building great products, redefining success, and turning the complexity of a chaotic world into the simplicity of a beautiful solution.
        About Revolut - People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products including spending, saving, investing, exchanging, travelling, and more help our 65+ million customers get more from their money every day. As we continue our lightning-fast growth,? 2 things are essential to our success: our people and our culture. In recognition of our outstanding employee experience, we've been certified as a Great Place to Work. So far, we have 10,000+ people working around the world, from our offices and remotely, to help us achieve our mission. And we're looking for more brilliant people. People who love building great products, redefining success, and turning the complexity of a chaotic world into the simplicity of a beautiful solution.
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        NEW
        Implement and champion advanced integration patterns, including microservices, API-led connectivity, event-driven architectures, and pub/sub models, to deliver resilient, future-proof solutions. * Proficiency in Azure Integration Services: Logic Apps, API Management, Service Bus, Event Grid. * Solid understanding of integration patterns: pub/sub, event-driven, API-led connectivity, request/response, batch. * Awareness of security best practices: OAuth2, JWT, TLS, API security.
        Implement and champion advanced integration patterns, including microservices, API-led connectivity, event-driven architectures, and pub/sub models, to deliver resilient, future-proof solutions. * Proficiency in Azure Integration Services: Logic Apps, API Management, Service Bus, Event Grid. * Solid understanding of integration patterns: pub/sub, event-driven, API-led connectivity, request/response, batch. * Awareness of security best practices: OAuth2, JWT, TLS, API security.
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        NEW
        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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        About Us - Graphcore is one of the worlds leading innovators in Artificial Intelligence compute. It is developing hardware, software and systems infrastructure that will unlock the next generation of AI breakthroughs and power the widespread adoption of AI solutions across every industry. As part of the SoftBank Group, Graphcore is a member of an elite family of companies responsible for some of the worlds most transformative technologies. Together, they share a bold vision: to enable Artificial Super Intelligence and ensure its benefits are accessible to everyone. Graphcores teams are drawn from diverse backgrounds and bring a broad range of skills and perspectives. A melting pot of AI research specialists, silicon designers, software engineers and systems architects, Graphcore enjoys a culture of continuous learning and constant innovation. Job Summary
        About Us - Graphcore is one of the worlds leading innovators in Artificial Intelligence compute. It is developing hardware, software and systems infrastructure that will unlock the next generation of AI breakthroughs and power the widespread adoption of AI solutions across every industry. As part of the SoftBank Group, Graphcore is a member of an elite family of companies responsible for some of the worlds most transformative technologies. Together, they share a bold vision: to enable Artificial Super Intelligence and ensure its benefits are accessible to everyone. Graphcores teams are drawn from diverse backgrounds and bring a broad range of skills and perspectives. A melting pot of AI research specialists, silicon designers, software engineers and systems architects, Graphcore enjoys a culture of continuous learning and constant innovation. Job Summary
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        NEW

        Staff Engineer Full Stack - Start-up

        Client Server
        Milton, CB24
        £60000 - £70000 per annum + equity + benefits
        Staff Engineer / Developer (Full Stack Python React) Cambridge to £70k - Do you enjoy taking ownership and working with a range of technology across the full stack on greenfield projects? You could be progressing your career as a founding member of a growing 'tech for good' start-up that is using AI technology to ensure compliance and efficiencies within the NHS and Health sector, with plans to expand to other regulated industries. As a Staff Engineer you'll work closely with the founders and a small technology team to design and develop scalable end-to-end solutions working across the full software development lifecycle through to CI/CD and deployment to Azure. You'll be mainly working with Python and TypeScript, collaboratively problem solving and promoting best practices. You'll join the team in Cambridge three days a week with flexibility to work from home the oth
        Staff Engineer / Developer (Full Stack Python React) Cambridge to £70k - Do you enjoy taking ownership and working with a range of technology across the full stack on greenfield projects? You could be progressing your career as a founding member of a growing 'tech for good' start-up that is using AI technology to ensure compliance and efficiencies within the NHS and Health sector, with plans to expand to other regulated industries. As a Staff Engineer you'll work closely with the founders and a small technology team to design and develop scalable end-to-end solutions working across the full software development lifecycle through to CI/CD and deployment to Azure. You'll be mainly working with Python and TypeScript, collaboratively problem solving and promoting best practices. You'll join the team in Cambridge three days a week with flexibility to work from home the oth
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        NEWPREMIUM
        Our Purpose - Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary - Mastercard is a global technology company in the payments industry, connecting billions of consumers, financial institutions, merchants, governments, and businesses worldwide. We are driving the future of commerce by enabling secure, simple, and smart transactions. Artificial Intelligence is at the core of our strategy to make Mastercard stronger an
        Our Purpose - Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary - Mastercard is a global technology company in the payments industry, connecting billions of consumers, financial institutions, merchants, governments, and businesses worldwide. We are driving the future of commerce by enabling secure, simple, and smart transactions. Artificial Intelligence is at the core of our strategy to make Mastercard stronger an
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        NEW
        Project Title: ??AI-Powered CCS Compliance Reporting System? We are a global technology company, driving energy innovation for a balanced planet. At SLB we create amazing technology that unlocks access to energy for the benefit of all. That is our purpose. As innovators, that has been our mission for 100 years. We are facing the worlds greatest balancing act- how to simultaneously reduce emissions and meet the worlds growing energy demands. Were working on that answer. Every day, a step closer. Our collective future depends on decarbonizing the fossil fuel industry, while innovating a new energy landscape. Its what drives us. Ensuring progress for people and the planet, on the journey to net zero and beyond. For a balanced planet. Our purpose: Together, we create amazing technology that unlocks access to energy for the benefit of all.
        Project Title: ??AI-Powered CCS Compliance Reporting System? We are a global technology company, driving energy innovation for a balanced planet. At SLB we create amazing technology that unlocks access to energy for the benefit of all. That is our purpose. As innovators, that has been our mission for 100 years. We are facing the worlds greatest balancing act- how to simultaneously reduce emissions and meet the worlds growing energy demands. Were working on that answer. Every day, a step closer. Our collective future depends on decarbonizing the fossil fuel industry, while innovating a new energy landscape. Its what drives us. Ensuring progress for people and the planet, on the journey to net zero and beyond. For a balanced planet. Our purpose: Together, we create amazing technology that unlocks access to energy for the benefit of all.
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        NEW

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        Frequently Asked Questions

        How many API jobs are there in Mayfair?
        There are 13 API jobs within 20 miles of Mayfair available on JustEngineers right now.

        Where in Mayfair are these jobs?
        You can find jobs in Milton, Southwark, Lambeth.

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

        How many temporary and part-time API jobs are available in Mayfair?
        There are 1 temporary API jobs and 1 part-time API jobs available in Mayfair at the moment.