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83 Contract API jobs in Croxley Green + 20 miles
378 exact matches jobs are outside your preferred location
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Intricately collaborate with technical product managers and engineering leads in driving an API-first solution focusing on ledger management, FX conversion, wallets, reconciliation and payouts - Provide track record in API and payments product management ideally within Fintech, financial services and/or related B2B sectors
Intricately collaborate with technical product managers and engineering leads in driving an API-first solution focusing on ledger management, FX conversion, wallets, reconciliation and payouts - Provide track record in API and payments product management ideally within Fintech, financial services and/or related B2B sectors
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Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
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API development using technologies and standards like REST/GraphQL/gRPC or similar.
API development using technologies and standards like REST/GraphQL/gRPC or similar.
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Experience with API development and integration
Experience with API development and integration
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Responsibilities include API development, system integration, dataoptimization, and performance tuning.
Responsibilities include API development, system integration, dataoptimization, and performance tuning.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
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Principal Software Engineer - Unified Client Experience (UCX)
Principal Software Engineer - Unified Client Experience (UCX)
Hargreaves Lansdown
London
£11500 - £90000 per annum + Generous bonus, pension, PMI & more
Deep expertise in React or React Native, with hands-on experience in secure API integration, authentication flows, and frontend architecture.
Deep expertise in React or React Native, with hands-on experience in secure API integration, authentication flows, and frontend architecture.
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Software Engineering Manager - Unified Client Experience (UCX)
Software Engineering Manager - Unified Client Experience (UCX)
Hargreaves Lansdown
London
£90000 - £115000 per annum + Generous bonus, pension, PMI and more
Strong understanding of secure API integration, authentication flows, and modern UI/UX architecture.
Strong understanding of secure API integration, authentication flows, and modern UI/UX architecture.
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Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
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Strong experience with React (including Hooks, Redux, or Context API) to build dynamic and responsive user interfaces.
Strong experience with React (including Hooks, Redux, or Context API) to build dynamic and responsive user interfaces.
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Familiarity with automation, API protection, or security orchestration. * Experience with API security or microservices identity patterns!
Familiarity with automation, API protection, or security orchestration. * Experience with API security or microservices identity patterns!
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Experience developing a commercial/external software product with external API consumers
Experience developing a commercial/external software product with external API consumers
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Senior JavaScript Developer Vue 3
Senior JavaScript Developer Vue 3
Client Server
Arundel Heights, Billericay (CM12), CM12 0EQ
£65000 - £75000 per annum
Senior JavaScript Developer / front End Engineer (Vue 3) Billericay / WFH to £75k - Are you a JavaScript web technologist seeking an opportunity to work with a modern tech stack on Greenfield projects? You could be progressing your career in a senior, hands-on role at an eCommerce payments solutions provider that has experienced great success in the last year and is growing as a result. * Salary (to £75k) * Bonus * 25 days holiday * Pension * Life assurance * Private medical care * Pizza days and other social events * Hybrid working with flexible hours - As a Senior JavaScript Developer you will take ownership of projects within an Agile development environment, with a focus on Vue 3 front end development to help evolve and scale the existing platforms as well as working on new Greenfield projects; you'll be able to take project ownership and manage all aspects of the
Senior JavaScript Developer / front End Engineer (Vue 3) Billericay / WFH to £75k - Are you a JavaScript web technologist seeking an opportunity to work with a modern tech stack on Greenfield projects? You could be progressing your career in a senior, hands-on role at an eCommerce payments solutions provider that has experienced great success in the last year and is growing as a result. * Salary (to £75k) * Bonus * 25 days holiday * Pension * Life assurance * Private medical care * Pizza days and other social events * Hybrid working with flexible hours - As a Senior JavaScript Developer you will take ownership of projects within an Agile development environment, with a focus on Vue 3 front end development to help evolve and scale the existing platforms as well as working on new Greenfield projects; you'll be able to take project ownership and manage all aspects of the
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MS Power Platform Developer with AI Chatbot - Location: Esher (two days WFH) Salary: c.£50K - £60K - This person will contribute directly to the organisations digital transformation roadmap by embedding automation and AI into our operations and business. This will involve building AI-powered conversational agents and automating business processes using Microsoft Power Platform tools like Power Apps, Power Automate, and Power Virtual Agents (part of Microsoft Copilot Studio). * Chatbot Development: Design, build, and implement AI chatbots using Power Virtual Agents/Copilot Studio to streamline interactions and automate tasks. * Process Automation: Create automated workflows and processes using Power Automate to improve efficiency and reduce manual tasks, often incorporating AI capabilities. * Application Development: Develop intelligent business applications with Power
MS Power Platform Developer with AI Chatbot - Location: Esher (two days WFH) Salary: c.£50K - £60K - This person will contribute directly to the organisations digital transformation roadmap by embedding automation and AI into our operations and business. This will involve building AI-powered conversational agents and automating business processes using Microsoft Power Platform tools like Power Apps, Power Automate, and Power Virtual Agents (part of Microsoft Copilot Studio). * Chatbot Development: Design, build, and implement AI chatbots using Power Virtual Agents/Copilot Studio to streamline interactions and automate tasks. * Process Automation: Create automated workflows and processes using Power Automate to improve efficiency and reduce manual tasks, often incorporating AI capabilities. * Application Development: Develop intelligent business applications with Power
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In-depth understanding of data structures, system architecture, API development for microservices frameworks, distributed systems and other backend-related concepts and best practices
In-depth understanding of data structures, system architecture, API development for microservices frameworks, distributed systems and other backend-related concepts and best practices
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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Senior Software Developer
Senior Software Developer
Rise Technical
Guildford, Surrey
£55000 - £65000 per annum + Private Healthcare + Pension + Holiday
Guildford/Remote - 1 day a month on-site £55,000 - £65,000 + Remote + Private Medical Insurance + Life Insurance + Other Benefits - This is an excellent opportunity for a Software Engineer with a deep understanding of SIP, VoIP and Python to join a forward-thinking development team where you can further your skills and grow with an award-winning technology business. This company is an established technology partner and managed service provider, specialising in unified communications and cloud contact centre solutions. They help public and private sector organisations modernise their digital infrastructure with a focus on improving customer experience and operational efficiency through system integration and digital transformation. In this varied role you will take a lead in the development of an existing SIP platform.
Guildford/Remote - 1 day a month on-site £55,000 - £65,000 + Remote + Private Medical Insurance + Life Insurance + Other Benefits - This is an excellent opportunity for a Software Engineer with a deep understanding of SIP, VoIP and Python to join a forward-thinking development team where you can further your skills and grow with an award-winning technology business. This company is an established technology partner and managed service provider, specialising in unified communications and cloud contact centre solutions. They help public and private sector organisations modernise their digital infrastructure with a focus on improving customer experience and operational efficiency through system integration and digital transformation. In this varied role you will take a lead in the development of an existing SIP platform.
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Senior Python Developer – Team Lead - Remote
Senior Python Developer – Team Lead - Remote
XACT PLACEMENTS LIMITED
London
From £55,000 to £62,000 per annum
Senior Python Developer Team Lead - Location:Remote (UK-based) Salary:£55,000 £62,000 per annum - Were recruiting on behalf of our client who are in EdTech supporting schools across the UK. The business develops cloud-based solutions that help schools use technology and data to improve outcomes. They are looking for aSenior Python Developerwith Team Lead experience to join their engineering team. Youll lead development, set technical standards and support the delivery of scalable, cloud-native products. Main Duties of the Role * Lead the design and development of scalable Python applications * Provide technical leadership within an Agile environment * Design and maintain AWS-based systems using Infrastructure-as-Code * Set best practices across development, testing and deployment * Mentor developers and contribute to technical innovation - Your Skills and Experience
Senior Python Developer Team Lead - Location:Remote (UK-based) Salary:£55,000 £62,000 per annum - Were recruiting on behalf of our client who are in EdTech supporting schools across the UK. The business develops cloud-based solutions that help schools use technology and data to improve outcomes. They are looking for aSenior Python Developerwith Team Lead experience to join their engineering team. Youll lead development, set technical standards and support the delivery of scalable, cloud-native products. Main Duties of the Role * Lead the design and development of scalable Python applications * Provide technical leadership within an Agile environment * Design and maintain AWS-based systems using Infrastructure-as-Code * Set best practices across development, testing and deployment * Mentor developers and contribute to technical innovation - Your Skills and Experience
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AVEVA is creating software trusted by over 90% of leading industrial companies. Job Description - Job Title: Senior Software Developer - Location: Cambridge, United Kingdom Hybrid (3 days at the office) Employment Type: Full-time regular (flexible working options available) The job - As part of our Industrial Platform Group, you will join a talented team of software engineers dedicated to designing, developing, and evolving CONNECT - the core industrial intelligence platform at AVEVA. CONNECT powers a diverse range of digital solutions deployed across global industries by AVEVA and our partners. In this role, youll work closely with internal stakeholders and engineering teams to understand requirements, shape system architecture, and deliver scalable platform capabilities. Your contributions will directly impact how CONNECT supports our customers digital transformatio
AVEVA is creating software trusted by over 90% of leading industrial companies. Job Description - Job Title: Senior Software Developer - Location: Cambridge, United Kingdom Hybrid (3 days at the office) Employment Type: Full-time regular (flexible working options available) The job - As part of our Industrial Platform Group, you will join a talented team of software engineers dedicated to designing, developing, and evolving CONNECT - the core industrial intelligence platform at AVEVA. CONNECT powers a diverse range of digital solutions deployed across global industries by AVEVA and our partners. In this role, youll work closely with internal stakeholders and engineering teams to understand requirements, shape system architecture, and deliver scalable platform capabilities. Your contributions will directly impact how CONNECT supports our customers digital transformatio
AVEVA is creating software trusted by over 90% of leading industrial companies. Job Title: Senior Software Developer - Location: Cambridge, United Kingdom (Hybrid) Employment Type: Full-time - The job - As part of our Industrial Platform Group, you will join a talented team of software engineers dedicated to designing, developing, and evolving CONNECT - the core industrial intelligence platform at AVEVA. CONNECT powers a diverse range of digital solutions deployed across global industries by AVEVA and our partners. In this role, youll work closely with internal stakeholders and engineering teams to understand requirements, shape system architecture, and deliver scalable platform capabilities. Your contributions will directly impact how CONNECT supports our customers digital transformation journeys and ensures long-term value for partners and the wider AVEVA ecosystem.
AVEVA is creating software trusted by over 90% of leading industrial companies. Job Title: Senior Software Developer - Location: Cambridge, United Kingdom (Hybrid) Employment Type: Full-time - The job - As part of our Industrial Platform Group, you will join a talented team of software engineers dedicated to designing, developing, and evolving CONNECT - the core industrial intelligence platform at AVEVA. CONNECT powers a diverse range of digital solutions deployed across global industries by AVEVA and our partners. In this role, youll work closely with internal stakeholders and engineering teams to understand requirements, shape system architecture, and deliver scalable platform capabilities. Your contributions will directly impact how CONNECT supports our customers digital transformation journeys and ensures long-term value for partners and the wider AVEVA ecosystem.
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Software Developer, C#, .NET Core, SQL Server, COR7417
Software Developer, C#, .NET Core, SQL Server, COR7417
Corriculo Ltd
Rackend, Witney (OX28), OX28
£40k - 50k per year + Benefits
This is a great time for a talented full-stack C# Software Developer, with skills in both web and desktop development to join an established, niche software house, based just outside Witney, West Oxfordshire. The Role - The C# Software Developer will be joining a company that is well-established with a strong product range (mission-critical, browser and desktop-based software developed predominantly in C#, ASP.NET MVC, .NET Core, JavaScript and SQL Server) used by market leading companies across the globe. In addition to adding new functionality, the C# Software Developer will design, build, and maintain production-grade services, including defining APIs, implementing business logic, managing data access, and ensuring reliability through monitoring, logging, testing, and deployment. Working fully onsite in beautiful offices in the heart of the countryside, the C# Soft
This is a great time for a talented full-stack C# Software Developer, with skills in both web and desktop development to join an established, niche software house, based just outside Witney, West Oxfordshire. The Role - The C# Software Developer will be joining a company that is well-established with a strong product range (mission-critical, browser and desktop-based software developed predominantly in C#, ASP.NET MVC, .NET Core, JavaScript and SQL Server) used by market leading companies across the globe. In addition to adding new functionality, the C# Software Developer will design, build, and maintain production-grade services, including defining APIs, implementing business logic, managing data access, and ensuring reliability through monitoring, logging, testing, and deployment. Working fully onsite in beautiful offices in the heart of the countryside, the C# Soft
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Senior Software Developer
Senior Software Developer
Rise Technical Recruitment Limited
Guildford (GU1)
£55000 - £65000 per annum + Private Healthcare + Pension + Holiday
Guildford/Remote - 1 day a month on-site £55,000 - £65,000 + Remote + Private Medical Insurance + Life Insurance + Other Benefits - This is an excellent opportunity for a Software Engineer with a deep understanding of SIP, VoIP and Python to join a forward-thinking development team where you can further your skills and grow with an award-winning technology business. This company is an established technology partner and managed service provider, specialising in unified communications and cloud contact centre solutions. They help public and private sector organisations modernise their digital infrastructure with a focus on improving customer experience and operational efficiency through system integration and digital transformation. In this varied role you will take a lead in the development of an existing SIP platform.
Guildford/Remote - 1 day a month on-site £55,000 - £65,000 + Remote + Private Medical Insurance + Life Insurance + Other Benefits - This is an excellent opportunity for a Software Engineer with a deep understanding of SIP, VoIP and Python to join a forward-thinking development team where you can further your skills and grow with an award-winning technology business. This company is an established technology partner and managed service provider, specialising in unified communications and cloud contact centre solutions. They help public and private sector organisations modernise their digital infrastructure with a focus on improving customer experience and operational efficiency through system integration and digital transformation. In this varied role you will take a lead in the development of an existing SIP platform.
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About Revolut - People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products including spending, saving, investing, exchanging, travelling, and more help our 65+ million customers get more from their money every day. As we continue our lightning-fast growth,? 2 things are essential to our success: our people and our culture. In recognition of our outstanding employee experience, we've been certified as a Great Place to Work. So far, we have 10,000+ people working around the world, from our offices and remotely, to help us achieve our mission. And we're looking for more brilliant people. People who love building great products, redefining success, and turning the complexity of a chaotic world into the simplicity of a beautiful solution. About the role
About Revolut - People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products including spending, saving, investing, exchanging, travelling, and more help our 65+ million customers get more from their money every day. As we continue our lightning-fast growth,? 2 things are essential to our success: our people and our culture. In recognition of our outstanding employee experience, we've been certified as a Great Place to Work. So far, we have 10,000+ people working around the world, from our offices and remotely, to help us achieve our mission. And we're looking for more brilliant people. People who love building great products, redefining success, and turning the complexity of a chaotic world into the simplicity of a beautiful solution. About the role
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Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
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A leading retailer are looking for a Senior iOS App Developer to join their Mobile Team to contribute to the development and evolution of their Mobile App. As the Senior iOS App Developer, you will be responsible for building and maintaining the iOS version of the app, ensuring it delivers a pixel-perfect, performant, and luxury-aligned experience for customers. You will be a high-performing developer who thrives on clean architecture, elegant code collaborative delivery whilst working as part of an Agile cross-functional team. Skills and Experience * Strong proficiency in Swift and iOS SDKs, with a deep understanding of UIKit, SwiftUI, Combine, and Core frameworks. * Experience with RESTful APIs, JSON, and mobile architecture patterns (MVVM, Clean Architecture). * Familiarity with Xcode, GitHub, mobile CI/CD tools, automated testing frameworks and the app store deplo
A leading retailer are looking for a Senior iOS App Developer to join their Mobile Team to contribute to the development and evolution of their Mobile App. As the Senior iOS App Developer, you will be responsible for building and maintaining the iOS version of the app, ensuring it delivers a pixel-perfect, performant, and luxury-aligned experience for customers. You will be a high-performing developer who thrives on clean architecture, elegant code collaborative delivery whilst working as part of an Agile cross-functional team. Skills and Experience * Strong proficiency in Swift and iOS SDKs, with a deep understanding of UIKit, SwiftUI, Combine, and Core frameworks. * Experience with RESTful APIs, JSON, and mobile architecture patterns (MVVM, Clean Architecture). * Familiarity with Xcode, GitHub, mobile CI/CD tools, automated testing frameworks and the app store deplo
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