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        83 Permanent API jobs in Mayfair + 20 miles

        PowerBI Developer

        Halian Technology Limited
        W1, Central London
        From £70,000 to £75,000 per annum Plus bonus and benefits
        My client is an award-winning and market-leading insights and solutions provider across pensions and financial services, energy, health, and analytics. The Opportunity - We're looking for an experienced and innovativePower Platform Developerto join my clients growing team. Youll play a key role in designing, developing, and supporting scalable, user-friendly business applications, automation workflows, and analytics solutions using Microsoft Power Platform. This is a fantastic opportunity to work across a diverse range of business areas, collaborating closely with stakeholders to drive digital transformation and operational efficiency. Key Responsibilities * Design, build, and maintain custom business applications usingPower Apps * Develop and enhance workflows and automations withPower Automate * Create interactive dashboards and data visualisations usingPower BI
        My client is an award-winning and market-leading insights and solutions provider across pensions and financial services, energy, health, and analytics. The Opportunity - We're looking for an experienced and innovativePower Platform Developerto join my clients growing team. Youll play a key role in designing, developing, and supporting scalable, user-friendly business applications, automation workflows, and analytics solutions using Microsoft Power Platform. This is a fantastic opportunity to work across a diverse range of business areas, collaborating closely with stakeholders to drive digital transformation and operational efficiency. Key Responsibilities * Design, build, and maintain custom business applications usingPower Apps * Develop and enhance workflows and automations withPower Automate * Create interactive dashboards and data visualisations usingPower BI
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        NEW
        Espire Infolabs is hiring for MS Power Platform Engineer for London, UK location. Job Title: MS Power Platform Engineer - Job Type: Permanent - Job Location: London (3 Days/week onsite) We are seeking a skilled Power Platform Engineer with deep insurance industry expertise to design, develop, and implement automation solutions using Microsoft Power Platform technologies. The successful candidate will serve as a technical expert in Power Automate and broader Power Platform capabilities while effectively managing stakeholder relationships and driving digital transformation initiatives within the insurance and re-insurance domain. Key Responsibilities - Technical Development * Design and develop complex automation workflows using Power Automate (formerly Microsoft Flow) * Microsoft Copilot Studio * Build custom applications using Power Apps to meet specific business requ
        Espire Infolabs is hiring for MS Power Platform Engineer for London, UK location. Job Title: MS Power Platform Engineer - Job Type: Permanent - Job Location: London (3 Days/week onsite) We are seeking a skilled Power Platform Engineer with deep insurance industry expertise to design, develop, and implement automation solutions using Microsoft Power Platform technologies. The successful candidate will serve as a technical expert in Power Automate and broader Power Platform capabilities while effectively managing stakeholder relationships and driving digital transformation initiatives within the insurance and re-insurance domain. Key Responsibilities - Technical Development * Design and develop complex automation workflows using Power Automate (formerly Microsoft Flow) * Microsoft Copilot Studio * Build custom applications using Power Apps to meet specific business requ
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        NEWFEATURED

        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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        NEW

        AI Engineer

        Oscar Associates (UK) Limited
        EC1, City of London
        £55000 - £75000 per annum + benefits
        Job Title: AI Engineer (Media) Location: London (Farringdon - 3 days a week onsite) Salary: £55,000 - £70,000 - About Us - We are more than just a media agency; we are people people. At our core lies a commitment to understanding, trust, integrity, and delivering results. With a focus on data-driven decision-making, we have built a reputation for driving tangible outcomes for our clients. As an employee-owned organisation, we value our team members' contributions and provide them with opportunities to shape the company's future. Join us, and let's create meaningful change together. The Role - As an AI Engineer, you will head up the design, build, and optimisation of our data infrastructure, automation solutions, and AI-driven tools. Leading Data Architecture, MarTech, AI & Automation, you will ensure that data flows seamlessly across the business and is harnessed effe
        Job Title: AI Engineer (Media) Location: London (Farringdon - 3 days a week onsite) Salary: £55,000 - £70,000 - About Us - We are more than just a media agency; we are people people. At our core lies a commitment to understanding, trust, integrity, and delivering results. With a focus on data-driven decision-making, we have built a reputation for driving tangible outcomes for our clients. As an employee-owned organisation, we value our team members' contributions and provide them with opportunities to shape the company's future. Join us, and let's create meaningful change together. The Role - As an AI Engineer, you will head up the design, build, and optimisation of our data infrastructure, automation solutions, and AI-driven tools. Leading Data Architecture, MarTech, AI & Automation, you will ensure that data flows seamlessly across the business and is harnessed effe
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        Senior C# .NET Developer (Hybrid)

        Get Staffed Online Recruitment
        W1B, West London
        £68 000 - £72 000 per annum
        Senior C# .NET Developer - Mayfair, London - Hybrid (1 - 2 days per week in the office) £68,000 - £72,000 per annum - The Role - Our client is hiring a backend C# .NET Developer to join their engineering team in a hybrid role (1 - 2 days per week in the office). You'll help build and maintain high-performance backend systems that support searching, order processing, and background processes with a strong focus on both application logic and data access. This role is ideal for someone confident in both C#/.NET development and SQL, and who enjoys working on clean, maintainable code and performance-optimised database logic. * Designing and building backend services in C#. * Building secure, well-structured APIs with throttling and versioning. * Developing durable workflows. * Writing efficient and scalable SQL queries, stored procedures, and scripts.
        Senior C# .NET Developer - Mayfair, London - Hybrid (1 - 2 days per week in the office) £68,000 - £72,000 per annum - The Role - Our client is hiring a backend C# .NET Developer to join their engineering team in a hybrid role (1 - 2 days per week in the office). You'll help build and maintain high-performance backend systems that support searching, order processing, and background processes with a strong focus on both application logic and data access. This role is ideal for someone confident in both C#/.NET development and SQL, and who enjoys working on clean, maintainable code and performance-optimised database logic. * Designing and building backend services in C#. * Building secure, well-structured APIs with throttling and versioning. * Developing durable workflows. * Writing efficient and scalable SQL queries, stored procedures, and scripts.
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        Backend Developer

        Lynx Recruitment Limited
        SW1W, South West London
        From £60,000 to £70,000 per annum
        Node Developer Remote Working - Lynx are currently working with a large IT consultancy to help them source a Node Developer. Our client is large global Consultancy who work with enterprise clients, solving their business and technology problems using cutting edge Solutions. Design, implement, and manage backend applications and APIs using Node.js - Work with RESTful APIs and external services to enhance system capabilities and connectivity - Perform unit and integration testing, troubleshoot issues, and maintain high code reliability - Collaborating with stakeholders and leadership to understand and refine project requirements - Working on diverse projects and challenges in a consultancy capacity - Advocating for and contributing to best practices in software engineering across teams and projects - Previous experience working within a consulting organisation is essent
        Node Developer Remote Working - Lynx are currently working with a large IT consultancy to help them source a Node Developer. Our client is large global Consultancy who work with enterprise clients, solving their business and technology problems using cutting edge Solutions. Design, implement, and manage backend applications and APIs using Node.js - Work with RESTful APIs and external services to enhance system capabilities and connectivity - Perform unit and integration testing, troubleshoot issues, and maintain high code reliability - Collaborating with stakeholders and leadership to understand and refine project requirements - Working on diverse projects and challenges in a consultancy capacity - Advocating for and contributing to best practices in software engineering across teams and projects - Previous experience working within a consulting organisation is essent
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        Backend Developer

        Lynx Recruitment Limited
        SW1W, South West London
        From £45,000 to £60,000 per annum
        Node Developer Remote Working - Lynx are currently working with a large IT consultancy to help them source a Node Developer. Our client is large global Consultancy who work with enterprise clients, solving their business and technology problems using cutting edge Solutions. Design, implement, and manage backend applications and APIs using Node.js - Work with RESTful APIs and external services to enhance system capabilities and connectivity - Perform unit and integration testing, troubleshoot issues, and maintain high code reliability - Collaborating with stakeholders and leadership to understand and refine project requirements - Working on diverse projects and challenges in a consultancy capacity - Advocating for and contributing to best practices in software engineering across teams and projects - Previous experience working within a consulting organisation is essent
        Node Developer Remote Working - Lynx are currently working with a large IT consultancy to help them source a Node Developer. Our client is large global Consultancy who work with enterprise clients, solving their business and technology problems using cutting edge Solutions. Design, implement, and manage backend applications and APIs using Node.js - Work with RESTful APIs and external services to enhance system capabilities and connectivity - Perform unit and integration testing, troubleshoot issues, and maintain high code reliability - Collaborating with stakeholders and leadership to understand and refine project requirements - Working on diverse projects and challenges in a consultancy capacity - Advocating for and contributing to best practices in software engineering across teams and projects - Previous experience working within a consulting organisation is essent
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        Full-Stack Developer (Python/Django) PropTech Start-up - Location:London Area (Shoreditch) Work Model:Hybrid 3 days in office - Job Type:Full-Time - Salary: £70k - £80k - About Us - We are working with a fast-growing Prop-Tech start-up on a mission to revolutionise the property rental market by putting power into the hands of tenants. Backed by investors but already very profitable with a solid client-base, they're building cutting-edge solutions that blend technology with the property sector to create seamless, data-driven experiences. Were looking for aFull-Stack Developer (Python / Django / React)with3-5 years of experienceto join their small team. If you thrive in a fast-paced start-up environment and love building scalable, high-performance applications, wed love to hear from you. Key Responsibilities * Design, develop, and maintain full-stack applications usingP
        Full-Stack Developer (Python/Django) PropTech Start-up - Location:London Area (Shoreditch) Work Model:Hybrid 3 days in office - Job Type:Full-Time - Salary: £70k - £80k - About Us - We are working with a fast-growing Prop-Tech start-up on a mission to revolutionise the property rental market by putting power into the hands of tenants. Backed by investors but already very profitable with a solid client-base, they're building cutting-edge solutions that blend technology with the property sector to create seamless, data-driven experiences. Were looking for aFull-Stack Developer (Python / Django / React)with3-5 years of experienceto join their small team. If you thrive in a fast-paced start-up environment and love building scalable, high-performance applications, wed love to hear from you. Key Responsibilities * Design, develop, and maintain full-stack applications usingP
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        Business Analyst - IT Software Consultancy

        Octad Recruitment Consultants (Octad Ltd )
        BR1, Bromley
        From £40,000 to £60,000 per annum Good Benefits
        ThisvibrantandexpandingcompanyarelookingforaBusinessAnalysttoworkcloselywiththeCEOinthisexcitingphaseoftheirexpansion.,TheCompanyisanend-to-enddigitalsolutionorganisation. TheyarelookingforanexperiencedBusinessAnalysttojointheirteam. Inthisrole,youllbethebridgebetweenbusinessneedsandtechnicalsolutions-gatheringrequirements,analysingprocesses,anddeliveringactionableinsightsthathelpguideproductdevelopmentandbusinessstrategy. ThedevelopmentteamarebasedoverseasinSouthAfricaandThailand,withtheCTOandasystemsmanager/UATpersonbeingtheonlyUKbasedpartoftheteam. Thisroleiskeyinthatitwillbeaseniorandkeymemberofthedevelopmentteamwhichwillincludearchitectureandstrategydecisions. Collaboratewithstakeholderstogatheranddefinebusinessrequirements - Translatebusinessneedsintofunctionalandtechnicalspecifications - Analyseexistingprocessesandrecommendimprovementstoincreaseefficiencyandsca
        ThisvibrantandexpandingcompanyarelookingforaBusinessAnalysttoworkcloselywiththeCEOinthisexcitingphaseoftheirexpansion.,TheCompanyisanend-to-enddigitalsolutionorganisation. TheyarelookingforanexperiencedBusinessAnalysttojointheirteam. Inthisrole,youllbethebridgebetweenbusinessneedsandtechnicalsolutions-gatheringrequirements,analysingprocesses,anddeliveringactionableinsightsthathelpguideproductdevelopmentandbusinessstrategy. ThedevelopmentteamarebasedoverseasinSouthAfricaandThailand,withtheCTOandasystemsmanager/UATpersonbeingtheonlyUKbasedpartoftheteam. Thisroleiskeyinthatitwillbeaseniorandkeymemberofthedevelopmentteamwhichwillincludearchitectureandstrategydecisions. Collaboratewithstakeholderstogatheranddefinebusinessrequirements - Translatebusinessneedsintofunctionalandtechnicalspecifications - Analyseexistingprocessesandrecommendimprovementstoincreaseefficiencyandsca
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        Senior Backend Engineer

        Ncounter LTD
        SW1, South West 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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        We're looking for an experienced Senior Application Support Engineer to join a growing IT team and play a key role in supporting critical business applications across a modern and complex technology stack. * Investigating and resolving technical incidents, ensuring minimal downtime and effective root cause analysis * Proactively maintaining and optimising applications, performing upgrades and configuration changes * Monitoring system performance, defining service-level objectives, and addressing bottlenecks before they impact users * Collaborating closely with engineering and business teams to drive operational excellence * Enhancing processes, documentation, and tooling to support continuous improvement * Proven experience in an application support or support engineering role, within financial services ideally, or another regulated environment
        We're looking for an experienced Senior Application Support Engineer to join a growing IT team and play a key role in supporting critical business applications across a modern and complex technology stack. * Investigating and resolving technical incidents, ensuring minimal downtime and effective root cause analysis * Proactively maintaining and optimising applications, performing upgrades and configuration changes * Monitoring system performance, defining service-level objectives, and addressing bottlenecks before they impact users * Collaborating closely with engineering and business teams to drive operational excellence * Enhancing processes, documentation, and tooling to support continuous improvement * Proven experience in an application support or support engineering role, within financial services ideally, or another regulated environment
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        We are looking for an enthusiastic and proactive Automation Test Engineer who boasts experience with Python and Pytest to join our fantastic London based fintech client, working largely remote with monthly get togethers. This Automation Tester will be backend-focused, testing the server-side components, ensuring that the database (SQL), APIs, and business logic function correctly and efficiently. * Backend Automation testing skills with Python and Pytest. * Solid SQL skills and experience with relational databases. * Solid experience in automation testing using tools such as Selenium and Appium. * Batch processing experience. * Financial services / fintech experience. If you're passionate about testing, automation, and continuous learning, we would love to hear from you!
        We are looking for an enthusiastic and proactive Automation Test Engineer who boasts experience with Python and Pytest to join our fantastic London based fintech client, working largely remote with monthly get togethers. This Automation Tester will be backend-focused, testing the server-side components, ensuring that the database (SQL), APIs, and business logic function correctly and efficiently. * Backend Automation testing skills with Python and Pytest. * Solid SQL skills and experience with relational databases. * Solid experience in automation testing using tools such as Selenium and Appium. * Batch processing experience. * Financial services / fintech experience. If you're passionate about testing, automation, and continuous learning, we would love to hear from you!
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        Technical Architect

        Career Legal Ltd
        EC1M, City of London
        From £85,000 to £100,000 per annum
        Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
        Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
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        NEW
        Configure and support Axway solutions, including API management and B2B gateway. * Working knowledge of Axway technologies, particularly API management and B2B gateway.
        Configure and support Axway solutions, including API management and B2B gateway. * Working knowledge of Axway technologies, particularly API management and B2B gateway.
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        FEATURED

        SharePoint Developer

        PPF (Pension Protection Fund)
        CR0, Croydon
        From £56,000 to £61,500 per annum plus Civil Service pension and other
        You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
        You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
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        NEWFEATURED
        You'll also ensure alignment with enterprise-grade security practices, including zero trust principles, identity-aware routing, and integration with Azure API Management and Application Gateway. * API Gateway, Azure API Management (APIM), Azure Application Gateway
        You'll also ensure alignment with enterprise-grade security practices, including zero trust principles, identity-aware routing, and integration with Azure API Management and Application Gateway. * API Gateway, Azure API Management (APIM), Azure Application Gateway
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        Frequently Asked Questions

        How many permanent API jobs are there in Mayfair?
        There are 83 permanent API jobs within 20 miles of Mayfair available on CWJobs right now.

        Where in Mayfair are these permanent jobs?
        You can find permanent jobs in Southwark, The City, City (EC4), The City, City (EC3).

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