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- The City, City (EC3)
- Southwark
- The City, City (EC4)
- West Fields
- Euston
- The Borough
- Datchet Common
- Frimley
- Holborn
- Ireland
- City of London
- South East London
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17 Contract API jobs in Chapel Green, Wokingham + 20 miles
189 exact matches jobs are outside your preferred location
Full time - Experienced (relevant combo of work and education) Bachelor of Computer Science - Are you curious, motivated, and forward-thinking? At FIS youll have the opportunity to work on some of the most challenging and relevant issues in financial services and technology. Our talented people empower us, and we believe in being part of a team that is open, collaborative, entrepreneurial, passionate and above all fun. Youll join a dynamic, cross-functional team of engineers, analysts, and product experts focused on delivering high-performance financial solutions. Our teams operate in agile environments, embracing DevOps practices, continuous integration, and cloud-native architectures to accelerate delivery and maximize impact. What you will be doing * Designing and developing robust, scalable program logic for new applications and enhancing existing systems.
Full time - Experienced (relevant combo of work and education) Bachelor of Computer Science - Are you curious, motivated, and forward-thinking? At FIS youll have the opportunity to work on some of the most challenging and relevant issues in financial services and technology. Our talented people empower us, and we believe in being part of a team that is open, collaborative, entrepreneurial, passionate and above all fun. Youll join a dynamic, cross-functional team of engineers, analysts, and product experts focused on delivering high-performance financial solutions. Our teams operate in agile environments, embracing DevOps practices, continuous integration, and cloud-native architectures to accelerate delivery and maximize impact. What you will be doing * Designing and developing robust, scalable program logic for new applications and enhancing existing systems.
C# .NET Software Developer (Full time or Part time)
C# .NET Software Developer (Full time or Part time)
Gas Management Services Limited
Epping, Essex
Competitive
We have a great opportunity for a C# .NET Software Developer (Full time or Part time) to join our team in Cambridge. Apply with your CV and covering letter - Opportunity - We have a great opportunity for a C# .NET Software Developer to join our fantastic software development team based in Cambridge. This is an ideal role for someone who wants to join a friendly, small and highly technical team where you can have a real impact. The role - You will be embedded as a full-stack developer in one of our small agile development teams. You will collaborate alongside product owners, testers and other developers to develop features for our power-scheduling software product. Our view of agile software development is inspired by eXtreme Programming rather than Scrum. We focus more on the technical practices that enable agility, such as TDD, Pair Programming, SOLID, Simple Design
We have a great opportunity for a C# .NET Software Developer (Full time or Part time) to join our team in Cambridge. Apply with your CV and covering letter - Opportunity - We have a great opportunity for a C# .NET Software Developer to join our fantastic software development team based in Cambridge. This is an ideal role for someone who wants to join a friendly, small and highly technical team where you can have a real impact. The role - You will be embedded as a full-stack developer in one of our small agile development teams. You will collaborate alongside product owners, testers and other developers to develop features for our power-scheduling software product. Our view of agile software development is inspired by eXtreme Programming rather than Scrum. We focus more on the technical practices that enable agility, such as TDD, Pair Programming, SOLID, Simple Design
Were Gravita: the accountants fuelling ambitious businesses. Were a full service, tech-enabled firm, working with entrepreneurs and businesses to help them achieve their goals, and make an impact in the world. Were growing fast and are bringing like-minded advisors together to form a full-service tech-enabled accounting partner for thousands of SMEs. Our team use their incredible expertise alongside intuitive technology to help businesses and entrepreneurs plan better and grow faster. Our mission is to become the UKs leading tech-enabled accounting firm for SMEs. We have ambitious goals and our high-calibre team work hard to achieve them. We are one team with one agenda, working collaboratively in a respectful environment to deliver a great service to our clients. So if you join us, youll not only be working on exciting client challenges, youll also be helping us shap
Were Gravita: the accountants fuelling ambitious businesses. Were a full service, tech-enabled firm, working with entrepreneurs and businesses to help them achieve their goals, and make an impact in the world. Were growing fast and are bringing like-minded advisors together to form a full-service tech-enabled accounting partner for thousands of SMEs. Our team use their incredible expertise alongside intuitive technology to help businesses and entrepreneurs plan better and grow faster. Our mission is to become the UKs leading tech-enabled accounting firm for SMEs. We have ambitious goals and our high-calibre team work hard to achieve them. We are one team with one agenda, working collaboratively in a respectful environment to deliver a great service to our clients. So if you join us, youll not only be working on exciting client challenges, youll also be helping us shap
As a Data Analyst, specialising in Marketing you will be responsible for collecting, analysing, and interpreting marketing data to support decision-making across campaigns, channels, and customer segments. This role requires strong technical skills in Python and SQL to automate data pipelines, build analytical models, and generate actionable insights that drive growth, optimize ROI, and improve marketing performance. While the role is primarily focused around Marketing Data, there will be scope for involvement in wider Data Projects around Trading, Client Analytics, Sales, Compliance, Risk. Who we are - We are Trade Nation. We help our customers power up their trading through killer insights, transparent costs, and fairer ways to trade. Were innovators, and proud of it. And weve grown a lot in our decade as a market-leading low-cost trading powerhouse.
As a Data Analyst, specialising in Marketing you will be responsible for collecting, analysing, and interpreting marketing data to support decision-making across campaigns, channels, and customer segments. This role requires strong technical skills in Python and SQL to automate data pipelines, build analytical models, and generate actionable insights that drive growth, optimize ROI, and improve marketing performance. While the role is primarily focused around Marketing Data, there will be scope for involvement in wider Data Projects around Trading, Client Analytics, Sales, Compliance, Risk. Who we are - We are Trade Nation. We help our customers power up their trading through killer insights, transparent costs, and fairer ways to trade. Were innovators, and proud of it. And weve grown a lot in our decade as a market-leading low-cost trading powerhouse.
At Bluecrest, were more than a health assessment provider - were the health intelligence company. Since our founding in 2012, weve been on a mission to make high-quality, affordable health monitoring accessible to everyone across the UK and Ireland. Serving both individual customers and businesses, we empower people to take control of their wellbeing through early detection and long-term health insights. Our purpose is simple yet powerful: to give everyone confidence in their health. By 2028, our vision is to be the UKs leading health intelligence company, delivering vital health insights to over a million people every single day. Were proud to help people live healthier for longer, and we do it by making personal health monitoring easy, affordable, and impactful. Join us in shaping the future of health intelligence, where your work makes a real difference, every day.
At Bluecrest, were more than a health assessment provider - were the health intelligence company. Since our founding in 2012, weve been on a mission to make high-quality, affordable health monitoring accessible to everyone across the UK and Ireland. Serving both individual customers and businesses, we empower people to take control of their wellbeing through early detection and long-term health insights. Our purpose is simple yet powerful: to give everyone confidence in their health. By 2028, our vision is to be the UKs leading health intelligence company, delivering vital health insights to over a million people every single day. Were proud to help people live healthier for longer, and we do it by making personal health monitoring easy, affordable, and impactful. Join us in shaping the future of health intelligence, where your work makes a real difference, every day.
Job title: Senior Oracle Fusion Analyst - Location: London, Manchester, or Dublin - hybrid working arrangements with 2/3 days per week in the office. Package: Base salary, Company Bonus Plan, Pension plan, Private Medical, Generous leave allowance, Life Insurance, Income Protection. About iNIZIO - At Inizio, we're a global team driven by a shared purpose: to reimagine health. Formed in 2022 through the coming together of Ashfield and Huntsworth, we unite decades of experience with cutting-edge capabilities to deliver impactful solutions across the commercialization journey - from discovery to post-launch. Our global network of over 10,000 experts operates across 50 countries, supporting clients with strategic insight, medical excellence, creative engagement, and real-world delivery. We work with the world's leading health and life sciences businesses to solve complex
Job title: Senior Oracle Fusion Analyst - Location: London, Manchester, or Dublin - hybrid working arrangements with 2/3 days per week in the office. Package: Base salary, Company Bonus Plan, Pension plan, Private Medical, Generous leave allowance, Life Insurance, Income Protection. About iNIZIO - At Inizio, we're a global team driven by a shared purpose: to reimagine health. Formed in 2022 through the coming together of Ashfield and Huntsworth, we unite decades of experience with cutting-edge capabilities to deliver impactful solutions across the commercialization journey - from discovery to post-launch. Our global network of over 10,000 experts operates across 50 countries, supporting clients with strategic insight, medical excellence, creative engagement, and real-world delivery. We work with the world's leading health and life sciences businesses to solve complex
About us - At Xelix, we work with some of the worlds largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows. Xelix is a fast-paced scale-up - things move fast and expectations are high. We raised our Series B with Insight Partners in June 2025 and are expanding aggressively, whilst remaining profitable. We have over 100 talented people pulling together to achieve our goals. Everyone is trusted to take ownership, move fast and have a meaningful impact. We prioritise personal and professional growth, keep things fun & we love to celebrate a milestone together. In this role youll grow, be challenged and help shape the future of Xelix. If youre excited about building something special with us, wed love to hear from you. About the
About us - At Xelix, we work with some of the worlds largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows. Xelix is a fast-paced scale-up - things move fast and expectations are high. We raised our Series B with Insight Partners in June 2025 and are expanding aggressively, whilst remaining profitable. We have over 100 talented people pulling together to achieve our goals. Everyone is trusted to take ownership, move fast and have a meaningful impact. We prioritise personal and professional growth, keep things fun & we love to celebrate a milestone together. In this role youll grow, be challenged and help shape the future of Xelix. If youre excited about building something special with us, wed love to hear from you. About the
Department: Technology Team: AI Location: London with hybrid ways of working Position type: Short Term Contract (Inside IR35) until the end of Dec 2026 What the hiring manager says - As an AI Data Engineer, youll be at the heart of our efforts to build open telco models and advance AI in the telecom sector. This is a unique opportunity to work with cutting-edge data engineering pipelines, collaborate with academic and industry partners, and contribute to the development of synthetic data and knowledge resources that will shape the future of telecom AI. About the Team Youll join a dynamic, cross-functional team dedicated to advancing AI capabilities in the telecom sector. Our team is growing rapidly, with a culture of collaboration and technical excellence. We value curiosity, initiative, and a drive to set new benchmarks for the industry.
Department: Technology Team: AI Location: London with hybrid ways of working Position type: Short Term Contract (Inside IR35) until the end of Dec 2026 What the hiring manager says - As an AI Data Engineer, youll be at the heart of our efforts to build open telco models and advance AI in the telecom sector. This is a unique opportunity to work with cutting-edge data engineering pipelines, collaborate with academic and industry partners, and contribute to the development of synthetic data and knowledge resources that will shape the future of telecom AI. About the Team Youll join a dynamic, cross-functional team dedicated to advancing AI capabilities in the telecom sector. Our team is growing rapidly, with a culture of collaboration and technical excellence. We value curiosity, initiative, and a drive to set new benchmarks for the industry.
M365/Azure API integrations.
M365/Azure API integrations.
Upvests Investment API is easy to integrate so that fintechs and enterprises alike can save resources and fully focus on their core business.? Our Marketing team ensures Upvests Investment API is widely recognised as the best on the market. * 5+ years of product marketing experience in B2B SaaS, ideally within fintech, investments, or API-driven infrastructure.
Upvests Investment API is easy to integrate so that fintechs and enterprises alike can save resources and fully focus on their core business.? Our Marketing team ensures Upvests Investment API is widely recognised as the best on the market. * 5+ years of product marketing experience in B2B SaaS, ideally within fintech, investments, or API-driven infrastructure.
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
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Software Engineer - (Machine Learning Experience a plus) - hybrid
Software Engineer - (Machine Learning Experience a plus) - hybrid
FactSet Europe Ltd
London
Competitive
Proficiency with API design
Proficiency with API design
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
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Understanding of SQL, API
Understanding of SQL, API
Modern tech stack experience - Demonstrable experience with cloud platforms (preferably AWS), containerisation (Docker, Kubernetes), and API design (gRPC, REST).
Modern tech stack experience - Demonstrable experience with cloud platforms (preferably AWS), containerisation (Docker, Kubernetes), and API design (gRPC, REST).
Experience developing and integrating with Azure Services (e.g. Azure Functions, App Services, Entra ID, Cosmos DB, API Management, Redis, App Configuration).
Experience developing and integrating with Azure Services (e.g. Azure Functions, App Services, Entra ID, Cosmos DB, API Management, Redis, App Configuration).
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In this critical role, youll develop and maintain REST API over serverless functions using TypeScript; youll also design and implement scalable PostgreSQL schemas and data models. Other organisations may call this role Software Engineer, Software Developer, Back End Software Engineer, Server-Side Developer, Full Stack Developer, or API Developer.
In this critical role, youll develop and maintain REST API over serverless functions using TypeScript; youll also design and implement scalable PostgreSQL schemas and data models. Other organisations may call this role Software Engineer, Software Developer, Back End Software Engineer, Server-Side Developer, Full Stack Developer, or API Developer.
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Strong experience in Bash scripting and API scripting.
Strong experience in Bash scripting and API scripting.
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Thales people architect identity management and data protection solutions at the heart of digital security. Business and governments rely on us to bring trust to the billons of digital interactions they have with people. Our technologies and services help banks exchange funds, people cross borders, energy become smarter and much more. More than 30,000 organizations already rely on us to verify the identities of people and things, grant access to digital services, analyze vast quantities of information and encrypt data to make the connected world more secure. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer.
Thales people architect identity management and data protection solutions at the heart of digital security. Business and governments rely on us to bring trust to the billons of digital interactions they have with people. Our technologies and services help banks exchange funds, people cross borders, energy become smarter and much more. More than 30,000 organizations already rely on us to verify the identities of people and things, grant access to digital services, analyze vast quantities of information and encrypt data to make the connected world more secure. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer.
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Expertise in JavaScript and/or TypeScript and modern React, including Hooks, Context API, Server and Client Components
Expertise in JavaScript and/or TypeScript and modern React, including Hooks, Context API, Server and Client Components
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Extensive Salesforce development experience (including Apex triggers, classes, asynchronous Apex, API Integrations, Platform Events, LWCs and Sites)
Extensive Salesforce development experience (including Apex triggers, classes, asynchronous Apex, API Integrations, Platform Events, LWCs and Sites)
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AWS for underlying infrastructure (Aurora, Redis, Dynamo, S3, SNS, SQS, CloudFront, API Gateway, etc.)
AWS for underlying infrastructure (Aurora, Redis, Dynamo, S3, SNS, SQS, CloudFront, API Gateway, etc.)
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We serve millions of API requests with a 99.5% availability SLA. * Familiarity with API design and experience with at least one web framework
We serve millions of API requests with a 99.5% availability SLA. * Familiarity with API design and experience with at least one web framework
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Role/Job Title: Software Engineer C++, C# .Net - Work Location: Edinburgh - Role type Permanent/Fixed Term/Contracting: Contracting - Mode of working Hybrid/Office based: Office Based - The Role - We are seeking an experienced and hands-on Software Engineer with skills in developing applications on C++, C# .Net and with a Utilities background. Your Responsibilities * Development of applications using C++, C# .Net for power utilities products - Your Profile * In-depth knowledge of C# .NET languages * Design, develop, and manage high-performance software applications using C# * Implement and optimize code for performance, security, and memory efficiency * Test and debug various .NET applications * Monitor and optimize the performance and responsiveness of .NET applications across multiple platforms and environments * Integrate third-party libraries, tools, and APIs into
Role/Job Title: Software Engineer C++, C# .Net - Work Location: Edinburgh - Role type Permanent/Fixed Term/Contracting: Contracting - Mode of working Hybrid/Office based: Office Based - The Role - We are seeking an experienced and hands-on Software Engineer with skills in developing applications on C++, C# .Net and with a Utilities background. Your Responsibilities * Development of applications using C++, C# .Net for power utilities products - Your Profile * In-depth knowledge of C# .NET languages * Design, develop, and manage high-performance software applications using C# * Implement and optimize code for performance, security, and memory efficiency * Test and debug various .NET applications * Monitor and optimize the performance and responsiveness of .NET applications across multiple platforms and environments * Integrate third-party libraries, tools, and APIs into
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Join the team shaping the future of automotive intelligence - At Brego, were redefining how data powers the automotive industry. From cutting-edge vehicle valuations to advanced analytics, we build the technology behind smarter, faster, more transparent decisions for dealers, lenders, and partners across the UK and beyond. Were growing fast and were looking for an experienced Full Stack Developer with strong NodeJS and TypeScript skills to help us take our platform to the next level. What Youll Do * Design, build, and scale high-performance web applications using Next.js, TypeScript, and Node.js on AWS. * Deliver elegant, maintainable code and new product features that delight our users. * Collaborate with product, design, and data teams to translate ideas into real-world solutions. * Integrate with RESTful APIs and third-party services to expand our platforms capabil
Join the team shaping the future of automotive intelligence - At Brego, were redefining how data powers the automotive industry. From cutting-edge vehicle valuations to advanced analytics, we build the technology behind smarter, faster, more transparent decisions for dealers, lenders, and partners across the UK and beyond. Were growing fast and were looking for an experienced Full Stack Developer with strong NodeJS and TypeScript skills to help us take our platform to the next level. What Youll Do * Design, build, and scale high-performance web applications using Next.js, TypeScript, and Node.js on AWS. * Deliver elegant, maintainable code and new product features that delight our users. * Collaborate with product, design, and data teams to translate ideas into real-world solutions. * Integrate with RESTful APIs and third-party services to expand our platforms capabil
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Locations
- The City, City (EC3)
- Southwark
- The City, City (EC4)
- West Fields
- Euston
- The Borough
- Datchet Common
- Frimley
- Holborn
- Ireland
- City of London
- South East London
- Reading
- Central London
- Milton Keynes
- Newbury
- North West London
- South West London
- West End
- North London
- London
- Berkshire
- Hampshire
- Buckinghamshire
- Surrey
- Bedfordshire
- Hertfordshire
- Oxfordshire
- Wiltshire
- East Sussex
- South East
- South West