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        The City, City (EC4)
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        82 API jobs in City of London + 20 miles

        Senior Backend Engineer TypeScript Node API

        Client Server
        The City, City of London (EC4), EC2V
        £85000 - £100000 per annum + shares + benefits
        Senior Backend Engineer / Developer (TypeScript Node API) London / WFH to £100k Are you a senior technologist looking for an opportunity to progress your career in a hands-on role where you can make an impact? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically - improving liquidity and efficiency for all participants as the platform scales. As a Senior Backend Engineer you will collaborate with a small team of technologists and successful entrepreneurs to design and implement intelligent solutions to business needs, with a focus on TypeScript and Node backend systems but also with exposure to and occasional frontend work.
        Senior Backend Engineer / Developer (TypeScript Node API) London / WFH to £100k Are you a senior technologist looking for an opportunity to progress your career in a hands-on role where you can make an impact? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically - improving liquidity and efficiency for all participants as the platform scales. As a Senior Backend Engineer you will collaborate with a small team of technologists and successful entrepreneurs to design and implement intelligent solutions to business needs, with a focus on TypeScript and Node backend systems but also with exposure to and occasional frontend work.
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        NEWPREMIUM

        C# Developer .Net SQL API

        Client Server
        The City, City of London (EC4), EC4R
        £75000 - £90000 per annum + benefits
        C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k Are you an ambitious and motivated C# Developer looking for an opportunity to progress your career, working on complex and interesting systems? You could joining a global sports trading firm, earning substantial bonuses. * Salary to £90k * Bonus paid every six months based on personal performance (10-25%) * Professional development * Pension * Health Insurance * Gym membership * Social events, free fruit, snacks, coffee etc. As a C# Developer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with the strategy team on Greenfield projects which you'll take ownership of and will see the business impact of.
        C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k Are you an ambitious and motivated C# Developer looking for an opportunity to progress your career, working on complex and interesting systems? You could joining a global sports trading firm, earning substantial bonuses. * Salary to £90k * Bonus paid every six months based on personal performance (10-25%) * Professional development * Pension * Health Insurance * Gym membership * Social events, free fruit, snacks, coffee etc. As a C# Developer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with the strategy team on Greenfield projects which you'll take ownership of and will see the business impact of.
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        PREMIUM

        C++ Developer MacOS API

        Client Server
        The City, City of London (EC4), EC2V
        £65000 - £80000 per annum + benefits
        C++ Developer / Engineer (C++ Mac Extensions) WFH / London to £80k Do you have C++ coding skills combined with experience of developing Mac Extensions? You could be progressing your career at a rapidly expanding scale-up software house that is developing a highly complex network cyber security platform; the platform monitors network protocols in real-time, parses the commands and data structures to extract key metadata which is then analysed by in-house algorithms and allows customers to detect hackers, malware, data leakage and other malicious activity. As a C++ Developer you will focus on enabling the core product, written in C / C++ for Windows and Linux to run on Apple Mac software, using the latest Extensions, tools and API integrations. You can work from home most of the time, meeting up with colleagues in the London office once or twice a month.
        C++ Developer / Engineer (C++ Mac Extensions) WFH / London to £80k Do you have C++ coding skills combined with experience of developing Mac Extensions? You could be progressing your career at a rapidly expanding scale-up software house that is developing a highly complex network cyber security platform; the platform monitors network protocols in real-time, parses the commands and data structures to extract key metadata which is then analysed by in-house algorithms and allows customers to detect hackers, malware, data leakage and other malicious activity. As a C++ Developer you will focus on enabling the core product, written in C / C++ for Windows and Linux to run on Apple Mac software, using the latest Extensions, tools and API integrations. You can work from home most of the time, meeting up with colleagues in the London office once or twice a month.
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        NEWPREMIUM
        A fantastic opportunity has arisen for a Head of Integrations to join a pioneering software company that is transforming how global enterprises leverage cutting-edge technologies. This innovative business, backed by top-tier investors and recognised among the worlds most promising AI companies, is expanding their technical team to support continued growth and success. They are looking for an experienced technical leader to take full ownership of integrations with third-party systems. This is a hands-on, client-facing role ideal for someone who can combine deep technical knowledge with excellent communication and leadership skills to optimise client implementations. Note this is an individual contributor role leading clients opposed to team leadersership. Location:London office (3 days in office) or option to be based from the Cambridge office
        A fantastic opportunity has arisen for a Head of Integrations to join a pioneering software company that is transforming how global enterprises leverage cutting-edge technologies. This innovative business, backed by top-tier investors and recognised among the worlds most promising AI companies, is expanding their technical team to support continued growth and success. They are looking for an experienced technical leader to take full ownership of integrations with third-party systems. This is a hands-on, client-facing role ideal for someone who can combine deep technical knowledge with excellent communication and leadership skills to optimise client implementations. Note this is an individual contributor role leading clients opposed to team leadersership. Location:London office (3 days in office) or option to be based from the Cambridge office
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        A brilliant opportunity for an experienced Technical Presales professional to join a rapidly scaling AI software company who are transforming how global enterprises operate. This senior role will see you both leading and growing the pre-sales function while remaining hands-on with major strategic opportunities. Youll ensure that every engagement with prospective customers highlights the technical excellence, scalability, and enterprise readiness of their cutting-edge AI platform. Location:Central London Hybrid Salary:Competitive package with performance incentives + annual L&D budget + excellent benefits * Strong track record in presales or solutions engineering within a SaaS business, ideally with exposure to AI, cybersecurity, or enterprise-scale platforms * Proven experience building and leading high-performing technical presales or sales engineering teams
        A brilliant opportunity for an experienced Technical Presales professional to join a rapidly scaling AI software company who are transforming how global enterprises operate. This senior role will see you both leading and growing the pre-sales function while remaining hands-on with major strategic opportunities. Youll ensure that every engagement with prospective customers highlights the technical excellence, scalability, and enterprise readiness of their cutting-edge AI platform. Location:Central London Hybrid Salary:Competitive package with performance incentives + annual L&D budget + excellent benefits * Strong track record in presales or solutions engineering within a SaaS business, ideally with exposure to AI, cybersecurity, or enterprise-scale platforms * Proven experience building and leading high-performing technical presales or sales engineering teams
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        Role Overview 6 months London - Hybrid Inside IR35 - Umbrella Only The Qualtrics Developer will be responsible for designing, configuring, and deploying advanced survey solutions using the Qualtrics platform as part of Toyota Financial Services' Customer Experience Discovery initiative. This role is critical in enabling data driven insights through seamless survey integration, analytics, and reporting. Key Responsibilities * Build branded Qualtrics survey themes aligned with Toyota FS identity. * Develop dynamic, multi-channel surveys (email, portal intercepts, exit intent). * Implement advanced branching logic and variation frameworks for A/B testing. * Configure API connections to CRM systems and Power BI for real-time dashboards. * Ensure secure data handling and compliance with GDPR and Toyota FS standards.
        Role Overview 6 months London - Hybrid Inside IR35 - Umbrella Only The Qualtrics Developer will be responsible for designing, configuring, and deploying advanced survey solutions using the Qualtrics platform as part of Toyota Financial Services' Customer Experience Discovery initiative. This role is critical in enabling data driven insights through seamless survey integration, analytics, and reporting. Key Responsibilities * Build branded Qualtrics survey themes aligned with Toyota FS identity. * Develop dynamic, multi-channel surveys (email, portal intercepts, exit intent). * Implement advanced branching logic and variation frameworks for A/B testing. * Configure API connections to CRM systems and Power BI for real-time dashboards. * Ensure secure data handling and compliance with GDPR and Toyota FS standards.
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        FEATURED
        Description Job Description a. Manage complex FIX implementations and upgrades. c. Diagnose software and connection issues and recommend the appropriate solution. d. Analyze problems, answer questions, and provide training related to the software. e. Identify and test workarounds for bugs or deficiencies in the software and/or associated FIX infrastructure. f. Research issues dealing with third party software. g. Follow a standard set of procedure and methods when responding to customer requests or inquiries. h. Conduct research on questions and issues using available information resources and other FIX Analysts. i. Keep a detailed log of all customer interactions and prepares resolution reports for issues reported by the customer. j. Maintain Best Practices for FIX Onboarding and Integrations. Requirements
        Description Job Description a. Manage complex FIX implementations and upgrades. c. Diagnose software and connection issues and recommend the appropriate solution. d. Analyze problems, answer questions, and provide training related to the software. e. Identify and test workarounds for bugs or deficiencies in the software and/or associated FIX infrastructure. f. Research issues dealing with third party software. g. Follow a standard set of procedure and methods when responding to customer requests or inquiries. h. Conduct research on questions and issues using available information resources and other FIX Analysts. i. Keep a detailed log of all customer interactions and prepares resolution reports for issues reported by the customer. j. Maintain Best Practices for FIX Onboarding and Integrations. Requirements
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        NEW
        Description Job Description a. Manage complex FIX implementations and upgrades. c. Diagnose software and connection issues and recommend the appropriate solution. d. Analyze problems, answer questions, and provide training related to the software. e. Identify and test workarounds for bugs or deficiencies in the software and/or associated FIX infrastructure. f. Research issues dealing with third party software. g. Follow a standard set of procedure and methods when responding to customer requests or inquiries. h. Conduct research on questions and issues using available information resources and other FIX Analysts. i. Keep a detailed log of all customer interactions and prepares resolution reports for issues reported by the customer. j. Maintain Best Practices for FIX Onboarding and Integrations. Requirements
        Description Job Description a. Manage complex FIX implementations and upgrades. c. Diagnose software and connection issues and recommend the appropriate solution. d. Analyze problems, answer questions, and provide training related to the software. e. Identify and test workarounds for bugs or deficiencies in the software and/or associated FIX infrastructure. f. Research issues dealing with third party software. g. Follow a standard set of procedure and methods when responding to customer requests or inquiries. h. Conduct research on questions and issues using available information resources and other FIX Analysts. i. Keep a detailed log of all customer interactions and prepares resolution reports for issues reported by the customer. j. Maintain Best Practices for FIX Onboarding and Integrations. Requirements
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        NEWPREMIUM
        We need talented engineers with a strong low-level graphics and GPU development background on the Android platform, ideally with experience of working in the consumer electronics industry. This contract will be hybrid (3 days a week onsite, 2 remote), based near Egham. Its within IR35 but offering a good rate to offset that! The successful candidate will contribute to new, high-performance graphics solutions, integrate our solutions with new hardware platforms, optimise the Android OS graphics stack, benchmark our systems against competitors, work with 3rd party software developers and generally ensure that we have the best possible graphics experience on the market. Role and Responsibilities Develop innovations to optimise real-time rendering pipelines and deliver class-leading performance
        We need talented engineers with a strong low-level graphics and GPU development background on the Android platform, ideally with experience of working in the consumer electronics industry. This contract will be hybrid (3 days a week onsite, 2 remote), based near Egham. Its within IR35 but offering a good rate to offset that! The successful candidate will contribute to new, high-performance graphics solutions, integrate our solutions with new hardware platforms, optimise the Android OS graphics stack, benchmark our systems against competitors, work with 3rd party software developers and generally ensure that we have the best possible graphics experience on the market. Role and Responsibilities Develop innovations to optimise real-time rendering pipelines and deliver class-leading performance
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        NEW

        Senior Azure Developer (Azure, SDK, Node)

        MS Talent Ltd
        The City, City of London (EC2), EC2M
        £400 - £450 per day, Benefits Outside IR35
        Senior / Lead Azure Developer (Azure Developer, Microsoft Azure, Node.js, Microsoft SDK, Graph API) Bring a new custom application to the market! Location no issue - work from home! 6 month contract, £400 - £450 per day OUTSIDE IR35. Remote role in the UK. We are looking for a Senior Azure Developer / Lead Azure Developerwho specialises in building custom M365 applications that sit on Microsoft Azure. This role is for an Azure Developerwith deep experience using Microsoft SDKs, Graph API and enterprise integrations, not just front-end frameworks. You will be the hands-on technical ownerof a bespoke Microsoft Azure application, built using Node.jsand integrated with Microsoft enterprise services. * Proven experience as a Senior Azure Developerbuilding custom Microsoft Azure applications * Strong Node.js developmentexperience in an Azure Developerenvironment
        Senior / Lead Azure Developer (Azure Developer, Microsoft Azure, Node.js, Microsoft SDK, Graph API) Bring a new custom application to the market! Location no issue - work from home! 6 month contract, £400 - £450 per day OUTSIDE IR35. Remote role in the UK. We are looking for a Senior Azure Developer / Lead Azure Developerwho specialises in building custom M365 applications that sit on Microsoft Azure. This role is for an Azure Developerwith deep experience using Microsoft SDKs, Graph API and enterprise integrations, not just front-end frameworks. You will be the hands-on technical ownerof a bespoke Microsoft Azure application, built using Node.jsand integrated with Microsoft enterprise services. * Proven experience as a Senior Azure Developerbuilding custom Microsoft Azure applications * Strong Node.js developmentexperience in an Azure Developerenvironment
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        Payment Architect

        Stackstudio Digital Ltd.
        Watford, Hertfordshire
        Unspecified
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
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        The salary on offer for this role is £65,000 - £80,000 per annum Enfield, London - On-site We're seeking a Technical Development Lead to join our client's team to act as the subject matter expert and hands-on leader for their entire technology ecosystem. This pivotal role in a dynamic business environment requires someone capable of managing architecture, complex implementations, team leadership, and compliance oversight simultaneously. You will be responsible for ensuring the reliability, security, and scalability of all core systems across e-commerce, retail, and hospitality operations, translating strategic objectives into high-quality technical solutions with immediate impact. Responsibilities & Skills * Lead hands-on development and architecture, coding complex components and managing integrations across all platforms.
        The salary on offer for this role is £65,000 - £80,000 per annum Enfield, London - On-site We're seeking a Technical Development Lead to join our client's team to act as the subject matter expert and hands-on leader for their entire technology ecosystem. This pivotal role in a dynamic business environment requires someone capable of managing architecture, complex implementations, team leadership, and compliance oversight simultaneously. You will be responsible for ensuring the reliability, security, and scalability of all core systems across e-commerce, retail, and hospitality operations, translating strategic objectives into high-quality technical solutions with immediate impact. Responsibilities & Skills * Lead hands-on development and architecture, coding complex components and managing integrations across all platforms.
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        The salary on offer for this role is £65,000 - £80,000 per annum Enfield, London - On-site We're seeking a Technical Development Lead to join our client's team to act as the subject matter expert and hands-on leader for their entire technology ecosystem. This pivotal role in a dynamic business environment requires someone capable of managing architecture, complex implementations, team leadership, and compliance oversight simultaneously. You will be responsible for ensuring the reliability, security, and scalability of all core systems across e-commerce, retail, and hospitality operations, translating strategic objectives into high-quality technical solutions with immediate impact. Responsibilities & Skills * Lead hands-on development and architecture, coding complex components and managing integrations across all platforms.
        The salary on offer for this role is £65,000 - £80,000 per annum Enfield, London - On-site We're seeking a Technical Development Lead to join our client's team to act as the subject matter expert and hands-on leader for their entire technology ecosystem. This pivotal role in a dynamic business environment requires someone capable of managing architecture, complex implementations, team leadership, and compliance oversight simultaneously. You will be responsible for ensuring the reliability, security, and scalability of all core systems across e-commerce, retail, and hospitality operations, translating strategic objectives into high-quality technical solutions with immediate impact. Responsibilities & Skills * Lead hands-on development and architecture, coding complex components and managing integrations across all platforms.
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        Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build asustainableeconomy where everyone can prosper. We support a wide range of digital payments choices, making transactionssecure, 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 Overview We are looking for a software engineer to join an award winning team with a proven track record of combining data science techniques with an intimate knowledge of payments data to aid Financial Institutions in their fight against money laundering and fraud.
        Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build asustainableeconomy where everyone can prosper. We support a wide range of digital payments choices, making transactionssecure, 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 Overview We are looking for a software engineer to join an award winning team with a proven track record of combining data science techniques with an intimate knowledge of payments data to aid Financial Institutions in their fight against money laundering and fraud.
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        Quant Developer

        TEKsystems
        City of London, London
        800.00 - 800.00 GBP/Daily
        Were looking for a highly skilled Quantitative Developer to join our dynamic team. This is an opportunity to work on cutting-edge financial products and deliver robust, production-quality code that powers critical trading and risk systems. Youll collaborate closely with quants and traders to design and implement solutions that make a real impact. What Youll Do * Develop high-performance applications in C# or C++, with code deployed in production environments. * Design and implement system architecture and APIs for complex financial workflows. * Apply strong quantitative and mathematical skills to model and solve challenging problems. * Work with a broad range of financial products, including rates, FX, inflation, and credit. What Were Looking For * Proven experience in high-level programming (C# or C++). * Strong background in system/API design.
        Were looking for a highly skilled Quantitative Developer to join our dynamic team. This is an opportunity to work on cutting-edge financial products and deliver robust, production-quality code that powers critical trading and risk systems. Youll collaborate closely with quants and traders to design and implement solutions that make a real impact. What Youll Do * Develop high-performance applications in C# or C++, with code deployed in production environments. * Design and implement system architecture and APIs for complex financial workflows. * Apply strong quantitative and mathematical skills to model and solve challenging problems. * Work with a broad range of financial products, including rates, FX, inflation, and credit. What Were Looking For * Proven experience in high-level programming (C# or C++). * Strong background in system/API design.
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        PREMIUM
        Were looking for an experienced SDET to join a high-performing engineering team working on a high traffic, large-scale e-commerce platform. Youll play a key role in building and evolving a scalable, fully automated testing framework, helping ensure fast, safe and high-quality software delivery. Working closely with engineers, product and stakeholders, youll drive quality across web applications and APIs while tackling interesting technical challenges. * Designing and maintaining test automation frameworks (JavaScript/TypeScript) * Automated and manual testing of web applications and APIs * Test planning, estimation, execution and defect management * Integrating automated tests into CI/CD pipelines * Collaborating across teams to improve quality and close requirement gaps * Proven experience in SDET or test automation roles
        Were looking for an experienced SDET to join a high-performing engineering team working on a high traffic, large-scale e-commerce platform. Youll play a key role in building and evolving a scalable, fully automated testing framework, helping ensure fast, safe and high-quality software delivery. Working closely with engineers, product and stakeholders, youll drive quality across web applications and APIs while tackling interesting technical challenges. * Designing and maintaining test automation frameworks (JavaScript/TypeScript) * Automated and manual testing of web applications and APIs * Test planning, estimation, execution and defect management * Integrating automated tests into CI/CD pipelines * Collaborating across teams to improve quality and close requirement gaps * Proven experience in SDET or test automation roles
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        Permanent Location: London / Home (Hybrid) Salary: £70,000 - £90,000 (+ benefits) Skills: ETRM platform experience, (Openlink Endur, Findur etc.), Automation testing Python, Java etc. We are looking to recruit an Automation Tester, with trading platform experience, for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. This is a hybrid role and you will be required to work on client site in London 2 / 3 days a week. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows
        Permanent Location: London / Home (Hybrid) Salary: £70,000 - £90,000 (+ benefits) Skills: ETRM platform experience, (Openlink Endur, Findur etc.), Automation testing Python, Java etc. We are looking to recruit an Automation Tester, with trading platform experience, for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. This is a hybrid role and you will be required to work on client site in London 2 / 3 days a week. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows
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        Description ADP is hiring a Business Resiliency Planner Are you looking to build a career in Business Resiliency in a global company that offers career advancement opportunities throughout your career journey? Are you looking to join a global company with a culture of inclusion, collaboration and belonging? Well, this may be the right fit for you. Ready to make your mark? In this role, you will be responsible for protecting the organizations business assets through a Global Business Resiliency Program that establishes a single framework for how ADP manages, and controls risks associated with the recovery from business disruptions and disaster events. You will be involved in providing insight, guidance, and direction on the continued development and effectiveness of the global Business Resiliency Program.
        Description ADP is hiring a Business Resiliency Planner Are you looking to build a career in Business Resiliency in a global company that offers career advancement opportunities throughout your career journey? Are you looking to join a global company with a culture of inclusion, collaboration and belonging? Well, this may be the right fit for you. Ready to make your mark? In this role, you will be responsible for protecting the organizations business assets through a Global Business Resiliency Program that establishes a single framework for how ADP manages, and controls risks associated with the recovery from business disruptions and disaster events. You will be involved in providing insight, guidance, and direction on the continued development and effectiveness of the global Business Resiliency Program.
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        Appian Developer

        VIQU IT Recruitment
        Central London, London, WC2N 5DS
        £400 - 550 per day
        We are looking for an experienced Appian Developer to support integration and automation initiatives within a leading financial services organisation. This role focuses on connecting systems, automating complex business processes, and improving operational efficiency. * Design, develop, and maintain Appian applications to support fraud and spam prevention workflows. * Build and manage system integrations (APIs, web services, and third-party platforms) * Automate business processes to improve accuracy, speed, and resilience. * Working with offshore teams to complete end-to-end delivery, from requirements gathering to deployment * Ensure solutions meet security, compliance, and performance standards expected in financial services. * Must have proven experience as an Appian Developer. * Must have a strong background in system integration, process automation and APIs.
        We are looking for an experienced Appian Developer to support integration and automation initiatives within a leading financial services organisation. This role focuses on connecting systems, automating complex business processes, and improving operational efficiency. * Design, develop, and maintain Appian applications to support fraud and spam prevention workflows. * Build and manage system integrations (APIs, web services, and third-party platforms) * Automate business processes to improve accuracy, speed, and resilience. * Working with offshore teams to complete end-to-end delivery, from requirements gathering to deployment * Ensure solutions meet security, compliance, and performance standards expected in financial services. * Must have proven experience as an Appian Developer. * Must have a strong background in system integration, process automation and APIs.
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        Solutions Engineer

        Anson Mccade
        City of London (EC2A), EC2A
        From £60,000 to £65,000 per annum
        Im working with a global, purpose-driven technology group thats hiring a Solutions Engineer to support large-scale digital transformation across a diverse portfolio of innovative businesses. This Solutions Engineer role sits within a central Digital Solutions team and offers the chance to work with cloud, AI and emerging technologies to build scalable, real-world solutions used across multiple industries. As a Solutions Engineer, youll be hands-on designing and prototyping modern platforms, influencing engineering best practice, and creating reusable technical assets. Its a great opportunity for engineers who want exposure to cloud services, Generative AI, VR/AR and edge technologies in a highly collaborative environment. * Designing and developing cloud-native solutions and proof-of-concepts * Working with modern cloud services, APIs and microservices
        Im working with a global, purpose-driven technology group thats hiring a Solutions Engineer to support large-scale digital transformation across a diverse portfolio of innovative businesses. This Solutions Engineer role sits within a central Digital Solutions team and offers the chance to work with cloud, AI and emerging technologies to build scalable, real-world solutions used across multiple industries. As a Solutions Engineer, youll be hands-on designing and prototyping modern platforms, influencing engineering best practice, and creating reusable technical assets. Its a great opportunity for engineers who want exposure to cloud services, Generative AI, VR/AR and edge technologies in a highly collaborative environment. * Designing and developing cloud-native solutions and proof-of-concepts * Working with modern cloud services, APIs and microservices
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        PREMIUM
        Description and requirements Skanska, one of the worlds leading project development and construction groups, is an inclusive and responsible business that is helping to build a better society. We are looking for a Head of Data & Analytics to join our Technology & Sustainability team in Leavesden (Watford). The Head of Data Analytics will be responsible for setting the strategic direction, governance, and delivery of data capabilities across the organisation. * Be accountable for defining and executing the organisations data and analytics strategy, aligning it with business priorities and regulatory requirements. * Lead the Data Analytics and Engineering function, ensuring seamless collaboration across Analysts, Engineers, Architects, and Governance specialists, and preparing for the future integration of Data Science.
        Description and requirements Skanska, one of the worlds leading project development and construction groups, is an inclusive and responsible business that is helping to build a better society. We are looking for a Head of Data & Analytics to join our Technology & Sustainability team in Leavesden (Watford). The Head of Data Analytics will be responsible for setting the strategic direction, governance, and delivery of data capabilities across the organisation. * Be accountable for defining and executing the organisations data and analytics strategy, aligning it with business priorities and regulatory requirements. * Lead the Data Analytics and Engineering function, ensuring seamless collaboration across Analysts, Engineers, Architects, and Governance specialists, and preparing for the future integration of Data Science.
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        Lead Product Designer

        Halian Technology Limited
        Central London (W1)
        From £100,000 to £115,000 per annum Plus bonus and benefits
        Were looking for a passionate and pragmaticProductDesign Leadto build and shape the design function of my fintech clients product within the payments space. This is a rare opportunity to define my clients design culture from the ground upspanning UI/UX, API documentation, and visual identity across the organisation. Customer-centric simplicitysits at the heart of their product philosophy. As their first in-house design leadership hire, youll have a pivotal role in making design a strategic force across the business. Youll lead by examplesetting direction, creating scalable design systems, leveraging AI tools, and contributing directly with hands-on work across product and marketing design. Key Responsibilities * Report regularly to the Product Director and keep leadership informed.
        Were looking for a passionate and pragmaticProductDesign Leadto build and shape the design function of my fintech clients product within the payments space. This is a rare opportunity to define my clients design culture from the ground upspanning UI/UX, API documentation, and visual identity across the organisation. Customer-centric simplicitysits at the heart of their product philosophy. As their first in-house design leadership hire, youll have a pivotal role in making design a strategic force across the business. Youll lead by examplesetting direction, creating scalable design systems, leveraging AI tools, and contributing directly with hands-on work across product and marketing design. Key Responsibilities * Report regularly to the Product Director and keep leadership informed.
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        Business Analyst

        REC SOLUTIONS LIMITED
        The City, City of London (EC4), EC4N
        Competitive base salary plus bonus and benefits
        ***Hybrid, 3 days a week in the office 2 days remote*** An excellent opportunity has arisen for a Business Analyst to join a forward thinking, innovative exchange based in the City, London working with some cutting edge technologies. Benefits (not exhaustive list) - Business Analyst (FinTech, Financial Services, Trading, Equities, Equity) * Competitive salary * 25 days annual leave - not including bank holidays * Can opt to join Private Medical insurance scheme * Hybrid working * Flexible working hours * Company pension * Group Policies Life Assurance, Income Protection and Critical Illness * Discretionary bonus * Can opt to join Electric Car Scheme * Enhanced Maternity and Paternity Policy * Can opt to join Workplace Nursery Scheme * Length of service holiday entitlement
        ***Hybrid, 3 days a week in the office 2 days remote*** An excellent opportunity has arisen for a Business Analyst to join a forward thinking, innovative exchange based in the City, London working with some cutting edge technologies. Benefits (not exhaustive list) - Business Analyst (FinTech, Financial Services, Trading, Equities, Equity) * Competitive salary * 25 days annual leave - not including bank holidays * Can opt to join Private Medical insurance scheme * Hybrid working * Flexible working hours * Company pension * Group Policies Life Assurance, Income Protection and Critical Illness * Discretionary bonus * Can opt to join Electric Car Scheme * Enhanced Maternity and Paternity Policy * Can opt to join Workplace Nursery Scheme * Length of service holiday entitlement
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        Python Engineer

        Bloc Recruitment
        The City, City of London (EC4), EC2R
        £475 per day
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
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        Senior Java Software Engineer (Urgent)

        Morson Edge
        Tower Hill, City of London (EC3), E1W 1WY
        £500 - 600 per day
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
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        What is the average salary for API in City of London?

        Average salary per year
        £82,499

        The average salary for a API in City of London is £82,499. API in City of London salaries range from £64,999 to £92,499.

        Frequently Asked Questions

        How many API jobs are there in City of London?
        There are 82 API jobs within 20 miles of City of London available on Jobsite right now.

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

        How many temporary and part-time API jobs are available in City of London?
        There are 1 temporary API jobs and 7 part-time API jobs available in City of London at the moment.