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        4 Part Time API jobs in London + 20 miles

        Backend Engineer (.NET)

        Queen Square Recruitment Limited
        W1, Central London
        Up to £80,000 per annum
        We are looking for a skilled Backend Engineer with strong experience in .NET Core / .NET 6+ to join our team on a part-time basis (4 days per week) in London. You will work alongside AI, ML, and app development teams to build scalable, secure, and intelligent backend services. Key Responsibilities * Design, develop, and maintain scalable backend services using .NET Core / .NET 6+ * Collaborate efficiently on an AI-driven project alongside the customers Lead Backend Engineer * Work closely with ML Engineers, App Developers, and Data teams for integrated feature delivery * Design and build RESTful APIs to expose AI models and LLM prompt-based services * Integrate trained ML models into backend systems supporting real product features * Build and maintain infrastructure for data ingestion, processing, and secure storage
        We are looking for a skilled Backend Engineer with strong experience in .NET Core / .NET 6+ to join our team on a part-time basis (4 days per week) in London. You will work alongside AI, ML, and app development teams to build scalable, secure, and intelligent backend services. Key Responsibilities * Design, develop, and maintain scalable backend services using .NET Core / .NET 6+ * Collaborate efficiently on an AI-driven project alongside the customers Lead Backend Engineer * Work closely with ML Engineers, App Developers, and Data teams for integrated feature delivery * Design and build RESTful APIs to expose AI models and LLM prompt-based services * Integrate trained ML models into backend systems supporting real product features * Build and maintain infrastructure for data ingestion, processing, and secure storage
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        About Dune Dune is on a mission to make crypto data accessible. Were a collaborative multi-chain analytics platform used by thousands of developers, analysts, & investors to understand the on-chain world and the frontiers of finance. Were a team of ~55 employees, working together across Europe and eastern US timezones ?. We believe in our mission, and in building a powerful, open product that allows individuals and communities to do deep research into important ecosystems like Bitcoin, Ethereum, Solana, and many more. Were backed by some of the world's best investors. In February 2022, we announced our Series B funding round led by Coatue and Union Square Ventures, an important milestone that allowed us to double down on our mission. Were using the funds to educate, reward and empower a new generation of onchain analysts aka Wizards
        About Dune Dune is on a mission to make crypto data accessible. Were a collaborative multi-chain analytics platform used by thousands of developers, analysts, & investors to understand the on-chain world and the frontiers of finance. Were a team of ~55 employees, working together across Europe and eastern US timezones ?. We believe in our mission, and in building a powerful, open product that allows individuals and communities to do deep research into important ecosystems like Bitcoin, Ethereum, Solana, and many more. Were backed by some of the world's best investors. In February 2022, we announced our Series B funding round led by Coatue and Union Square Ventures, an important milestone that allowed us to double down on our mission. Were using the funds to educate, reward and empower a new generation of onchain analysts aka Wizards
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        Hours: ~20 hours across 5 days Beauhurst is seeking an experienced Legal Counsel to take full ownership of legal oversight and risk management across the business. This is a newly created role with a wide-ranging remit from data protection and commercial contracts to employment documentation, intellectual property, and governance. No two days will be the same: one moment you'll be steering complex negotiations with clients, the next advising the product team on new features, or ensuring our policies keep pace with legislative changes. You will be a trusted advisor to senior leadership and the commercial team turning legal complexity into clear, practical guidance and helping colleagues navigate high-stakes or sensitive situations.
        Hours: ~20 hours across 5 days Beauhurst is seeking an experienced Legal Counsel to take full ownership of legal oversight and risk management across the business. This is a newly created role with a wide-ranging remit from data protection and commercial contracts to employment documentation, intellectual property, and governance. No two days will be the same: one moment you'll be steering complex negotiations with clients, the next advising the product team on new features, or ensuring our policies keep pace with legislative changes. You will be a trusted advisor to senior leadership and the commercial team turning legal complexity into clear, practical guidance and helping colleagues navigate high-stakes or sensitive situations.
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        Amey are a leading provider of full life-cycle engineering, operations, and decarbonisation solutions, for transport infrastructure and complex facilities. Working for us, youll be delivering sustainable infrastructure solutions that enhance life and protect our shared future. Our people are driven by a set of strong values, based on safety, insight, and collaboration. The Opportunity We have a fantastic opportunity for a Senior Consultant - Full Stack Developer to join our Digital, Data and Technology Team within our Consulting Business Unit. Amey Consulting is a leading consultancy that drives innovation through data and technology, enhancing our clients' business operations and processes.
        Amey are a leading provider of full life-cycle engineering, operations, and decarbonisation solutions, for transport infrastructure and complex facilities. Working for us, youll be delivering sustainable infrastructure solutions that enhance life and protect our shared future. Our people are driven by a set of strong values, based on safety, insight, and collaboration. The Opportunity We have a fantastic opportunity for a Senior Consultant - Full Stack Developer to join our Digital, Data and Technology Team within our Consulting Business Unit. Amey Consulting is a leading consultancy that drives innovation through data and technology, enhancing our clients' business operations and processes.
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        6 exact matches jobs are outside your preferred location

        Division Digital, Technology & Innovation Department Data Strategy & Services Salary National (Edinburgh and Leeds) ranging from £72,100 - £95,000 and London £79,300 - £105,000 per annum (Salary offered will be based on skills and experience) About the FCA The FCA regulates the conduct of 45,000 firms in the UK to ensure our financial markets are honest, fair and competitive. Follow this link to find out more About the FCA. Our Data Strategy & Services department leads bold transformation by unlocking the power of data. Within the Intelligence & Digital division, we work together to deliver smarter, more collaborative regulation using advanced analytics, strong governance, and integrated data solutions. We foster a culture of curiosity, creativity, and continuous learning. We value diverse perspectives and encourage experimentation.
        Division Digital, Technology & Innovation Department Data Strategy & Services Salary National (Edinburgh and Leeds) ranging from £72,100 - £95,000 and London £79,300 - £105,000 per annum (Salary offered will be based on skills and experience) About the FCA The FCA regulates the conduct of 45,000 firms in the UK to ensure our financial markets are honest, fair and competitive. Follow this link to find out more About the FCA. Our Data Strategy & Services department leads bold transformation by unlocking the power of data. Within the Intelligence & Digital division, we work together to deliver smarter, more collaborative regulation using advanced analytics, strong governance, and integrated data solutions. We foster a culture of curiosity, creativity, and continuous learning. We value diverse perspectives and encourage experimentation.
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        Rates & Credit Web Frontend Engineer Position Overview Job Title Rates & Credit Web Frontend Engineer Location London Corporate Title Assistant Vice President Engineer is responsible for managing or performing work across multiple areas of the banks overall IT Platform/Infrastructure including analysis, development, and administration. It may also involve taking functional oversight of engineering delivery for specific departments. This role is a key contributor to the evolution of our Fixed Income trading platforms, helping to deliver a cohesive, web-based, real-time, and data-rich trader desktop. You will work closely with trading teams to build intuitive, high-performance user interfaces that support complex workflows and integrate seamlessly with strategic systems. What well offer you
        Rates & Credit Web Frontend Engineer Position Overview Job Title Rates & Credit Web Frontend Engineer Location London Corporate Title Assistant Vice President Engineer is responsible for managing or performing work across multiple areas of the banks overall IT Platform/Infrastructure including analysis, development, and administration. It may also involve taking functional oversight of engineering delivery for specific departments. This role is a key contributor to the evolution of our Fixed Income trading platforms, helping to deliver a cohesive, web-based, real-time, and data-rich trader desktop. You will work closely with trading teams to build intuitive, high-performance user interfaces that support complex workflows and integrate seamlessly with strategic systems. What well offer you
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        Job Title: Social Media Technology Executive Location: 1HQ Type of contract: full-time, permanent Diageo is the worlds leading premium drinks company, a business built on the principles and foundations laid by the giants of our industry. Arthur Guinness, Alexander Walker, and many other dedicated people that followed in their footsteps, cared deeply about the people and businesses they fostered, and the communities in which they operated. Today we stand on the shoulders of these giants and act with the same entrepreneurial spirit. We are a spirited company born of an incredible entrepreneurial legacy. The success of Guinness, Smirnoff, Johnnie Walker, Tanqueray, Baileys and many more brands led to the formation of our company in 1997. And we only thrive today because of the talent of our people to grow our brands, old and new, and keep them strong.
        Job Title: Social Media Technology Executive Location: 1HQ Type of contract: full-time, permanent Diageo is the worlds leading premium drinks company, a business built on the principles and foundations laid by the giants of our industry. Arthur Guinness, Alexander Walker, and many other dedicated people that followed in their footsteps, cared deeply about the people and businesses they fostered, and the communities in which they operated. Today we stand on the shoulders of these giants and act with the same entrepreneurial spirit. We are a spirited company born of an incredible entrepreneurial legacy. The success of Guinness, Smirnoff, Johnnie Walker, Tanqueray, Baileys and many more brands led to the formation of our company in 1997. And we only thrive today because of the talent of our people to grow our brands, old and new, and keep them strong.
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        Position Overview Job Title Rates and Credit Senior Full-Stack Engineer Location London Corporate Title Vice President You will play a key role in the transformation of Rates and Credit Fixed Income front-office technology landscape. As part of our multi-year platform modernisation project, you will be responsible for building a suite of new, real-time, high-performance React applications supporting various trading workflows for our growing business. You will be involved in architecting solutions across the stack, encouraging best practices and working closely with Business stakeholders to build a maintainable, operationally efficient and scalable platform to last the next decade. What well offer you Hybrid Working We understand that employee expectations and preferences are changing.
        Position Overview Job Title Rates and Credit Senior Full-Stack Engineer Location London Corporate Title Vice President You will play a key role in the transformation of Rates and Credit Fixed Income front-office technology landscape. As part of our multi-year platform modernisation project, you will be responsible for building a suite of new, real-time, high-performance React applications supporting various trading workflows for our growing business. You will be involved in architecting solutions across the stack, encouraging best practices and working closely with Business stakeholders to build a maintainable, operationally efficient and scalable platform to last the next decade. What well offer you Hybrid Working We understand that employee expectations and preferences are changing.
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        Vacancy Information Division / Department - Corporate Development Grade - Level 2 Status - Full Time or Happy to Talk Flexible Working Contract Type - Permanent Salary Grade Range - £54,178 - £62,807 Working Hours - 36.0 Hours per Week Shift Allowance - No Politically Restricted - No Location - Surrey Police Headquarters, Guildford The starting salary for this role will usually be at the bottom of the salary range and will be pro-rata if the working hours are less than full time. Chief Constables' Message We really welcome your interest in joining our Police Force. It is a privilege to lead the teams in Surrey Police who continuously work selflessly and tirelessly in order to keep people in our counties safe. We are looking for talented and inspirational people who put the needs of the public at the heart of everything that they do and who want to make a difference.
        Vacancy Information Division / Department - Corporate Development Grade - Level 2 Status - Full Time or Happy to Talk Flexible Working Contract Type - Permanent Salary Grade Range - £54,178 - £62,807 Working Hours - 36.0 Hours per Week Shift Allowance - No Politically Restricted - No Location - Surrey Police Headquarters, Guildford The starting salary for this role will usually be at the bottom of the salary range and will be pro-rata if the working hours are less than full time. Chief Constables' Message We really welcome your interest in joining our Police Force. It is a privilege to lead the teams in Surrey Police who continuously work selflessly and tirelessly in order to keep people in our counties safe. We are looking for talented and inspirational people who put the needs of the public at the heart of everything that they do and who want to make a difference.
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        Job Description: Junior Frontend Developer ABOUT US Newline Auction Software has been a trusted provider of auction management software for over 40 years, serving leading livestock firms in the UK, Ireland, Canada, and New Zealand. Our solutions streamline live sales, reduce paperwork, and automate administrationbringing speed, accuracy, and efficiency to the auction ring. With a renewed focus on innovation and product development, were growing our R&D team and investing in the future. Were looking for curious, capable people who are excited by practical software challenges and ready to make an impact. Were looking for a motivated and enthusiastic Junior Frontend Developer to join our growing R&D team during an exciting period of transformation and product development.
        Job Description: Junior Frontend Developer ABOUT US Newline Auction Software has been a trusted provider of auction management software for over 40 years, serving leading livestock firms in the UK, Ireland, Canada, and New Zealand. Our solutions streamline live sales, reduce paperwork, and automate administrationbringing speed, accuracy, and efficiency to the auction ring. With a renewed focus on innovation and product development, were growing our R&D team and investing in the future. Were looking for curious, capable people who are excited by practical software challenges and ready to make an impact. Were looking for a motivated and enthusiastic Junior Frontend Developer to join our growing R&D team during an exciting period of transformation and product development.
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        £100000 - £150000 per annum + bonus + benefits
        Senior C# Developer / Software Engineer (C# .Net) London onsite to £150k Opportunity to progress your career in a senior, hands-on C# Developer role at a global Asset Manager with c$3 million under management. As a Senior C# Developer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with he strategy team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on C# .Net backend and API development although you'll also have elements of front end work with JavaScript and React.js. You'll be based in plush City office on a fulltime basis, Monday to Friday. * You have expertise with C# .Net, ASP.Net development * You have a strong knowledge of databases (SQL or Oracle) * You're comfortable with JavaScript / React
        Senior C# Developer / Software Engineer (C# .Net) London onsite to £150k Opportunity to progress your career in a senior, hands-on C# Developer role at a global Asset Manager with c$3 million under management. As a Senior C# Developer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with he strategy team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on C# .Net backend and API development although you'll also have elements of front end work with JavaScript and React.js. You'll be based in plush City office on a fulltime basis, Monday to Friday. * You have expertise with C# .Net, ASP.Net development * You have a strong knowledge of databases (SQL or Oracle) * You're comfortable with JavaScript / React
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        NEWPREMIUM

        Principal Software Engineer

        Hays
        London
        £600.0 - £635.0 per day + up to £635 per day (Inside IR35)
        Up to £635 per day (Inside IR35) London / Remote 6 to 12 Months My client is an instantly recognisable consultancy who require a Principal Software Engineer with Active NPPV3 and Active Security Clearance (SC), to join a business critical programme with an end client. * Proven experience as a Principal Software Engineer * Active NPPV3 and Active Security Clearance (SC) * Proven experience in migration of legacy (Java) to modern versions (EE/EJB to Spring) * Migration from Oracle to PostgreSQL, and from Data Centre to Cloud (AWS) * Understanding of Java Standard Edition 8, Java Enterprise Edition 5, 6 and 11 * Demonstrable experience with PL/SQL development * Some skills in GIS (JavaScript/OpenLayers, TileCache and MapServer) * Experience in platforms / operating systems (Oracle Solis/Red Hat Enterprise Linux 8/Microsoft Windows 2k8,2k16,2k19)
        Up to £635 per day (Inside IR35) London / Remote 6 to 12 Months My client is an instantly recognisable consultancy who require a Principal Software Engineer with Active NPPV3 and Active Security Clearance (SC), to join a business critical programme with an end client. * Proven experience as a Principal Software Engineer * Active NPPV3 and Active Security Clearance (SC) * Proven experience in migration of legacy (Java) to modern versions (EE/EJB to Spring) * Migration from Oracle to PostgreSQL, and from Data Centre to Cloud (AWS) * Understanding of Java Standard Edition 8, Java Enterprise Edition 5, 6 and 11 * Demonstrable experience with PL/SQL development * Some skills in GIS (JavaScript/OpenLayers, TileCache and MapServer) * Experience in platforms / operating systems (Oracle Solis/Red Hat Enterprise Linux 8/Microsoft Windows 2k8,2k16,2k19)
        more
        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 Java Full stack Developer. 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 & Inside 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 Java Full stack Developer. 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 & Inside IR35
        more
        NEW

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        What is the average salary for API in London?

        Average salary per year
        £72,499

        The average salary for a API in London is £72,499. API in London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many part time API jobs are there in London?
        There are 4 part time API jobs within 20 miles of London available on Jobsite right now.

        What other similar jobs are there to part time API jobs in London?
        As well as part time API jobs in London, you can find part time IT, Software Development, Finance, amongst many others.