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102 Contract API jobs in The City, City of London + 20 miles
Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
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6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
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Backend Software Engineer Java Kotlin AWS
Backend Software Engineer Java Kotlin AWS
Client Server
Shoreditch, EC2A 2AP
£100000 - £120000 per annum
Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
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Solution Architect | IoT | Market Leaders | Watford | Hybrid | Centre of Excellence | £85-95,000 | Cloud Solution Architect Watford (Hybrid) Method Resourcing are proud to be partnering with a fast-growing, international technology business delivering critical services across multiple high-reliability sectors. Utilising IoT devices and custom built solutions, they are dominating their industry and you could be a part of their ambitious growth trajectory. They're seeking a Solutions Architect to integrate and consolidate processes across the business. We're looking for an experienced Solution Architect to design scalable, secure, and efficient technology solutions. You'll need to assess the current state across the business and design the best solution to unify all areas of the business without system downtime.
Solution Architect | IoT | Market Leaders | Watford | Hybrid | Centre of Excellence | £85-95,000 | Cloud Solution Architect Watford (Hybrid) Method Resourcing are proud to be partnering with a fast-growing, international technology business delivering critical services across multiple high-reliability sectors. Utilising IoT devices and custom built solutions, they are dominating their industry and you could be a part of their ambitious growth trajectory. They're seeking a Solutions Architect to integrate and consolidate processes across the business. We're looking for an experienced Solution Architect to design scalable, secure, and efficient technology solutions. You'll need to assess the current state across the business and design the best solution to unify all areas of the business without system downtime.
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Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
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Integration Architect
Integration Architect
Lynx Recruitment Limited
SW1W, South West London
From £85,000 to £100,000 per annum
Lynx Recruitment is currently working with an Award-Winning Tech consultancy who are looking for an Integration Architect to join their talented team. Provide expert advice on Integration Strategy, Architecture, and Design Assess client needs to recommend optimal integration approaches Lead design and implementation of integration solutions and technical blueprints Define and enforce integration standards and best practices Offer technical leadership to Integration Designers and Developers Serve as the primary technical contact for clients Deliver high-level integration designs and architectural documentation Champion integration strategy and thought leadership across clients Manage technology risks to ensure successful delivery Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design
Lynx Recruitment is currently working with an Award-Winning Tech consultancy who are looking for an Integration Architect to join their talented team. Provide expert advice on Integration Strategy, Architecture, and Design Assess client needs to recommend optimal integration approaches Lead design and implementation of integration solutions and technical blueprints Define and enforce integration standards and best practices Offer technical leadership to Integration Designers and Developers Serve as the primary technical contact for clients Deliver high-level integration designs and architectural documentation Champion integration strategy and thought leadership across clients Manage technology risks to ensure successful delivery Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design
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What We Do We're fixing time-off management. The Role We're looking for a bright graduate software engineer to join our team and help build the future of workplace tools. This is a genuine opportunity to work on real products, learn from experienced developers, and make meaningful contributions from day one. Remote-friendly with occasional in-person collaboration. What You'll Do * Build features for our time-off management platform * Work across our full stack: backend APIs to frontend interfaces * Learn modern development practices in a real-world environment * Collaborate with our team to solve actual customer problems * Take ownership of projects and see your code go live What We're Looking For * Degree in Computer Science, Engineering, or related field * Must have right to work in the UK * ASP.NET Web API * Next JS * Postgres * React * Containerized deployments
What We Do We're fixing time-off management. The Role We're looking for a bright graduate software engineer to join our team and help build the future of workplace tools. This is a genuine opportunity to work on real products, learn from experienced developers, and make meaningful contributions from day one. Remote-friendly with occasional in-person collaboration. What You'll Do * Build features for our time-off management platform * Work across our full stack: backend APIs to frontend interfaces * Learn modern development practices in a real-world environment * Collaborate with our team to solve actual customer problems * Take ownership of projects and see your code go live What We're Looking For * Degree in Computer Science, Engineering, or related field * Must have right to work in the UK * ASP.NET Web API * Next JS * Postgres * React * Containerized deployments
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About the Role We are looking for an experienced Senior Microsoft Dynamics 365 CRM Developer with strong expertise in MS Dynamics 365, Azure, and CRM customizations. The ideal candidate will have a proven track record of delivering end-to-end CRM solutions, leading teams, and driving best practices in CRM implementation and support. Key Responsibilities * Design, develop, and implement Microsoft Dynamics 365 CE Online solutions (Sales, Marketing, Service modules). * Develop and customize CRM plugins, workflows, Power Automate flows, and BPFs to support business processes. * Work with Azure Functions and integrate Dynamics CRM with third-party systems via Web APIs. * Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * Build, test, and maintain C# .NET components using TDD approach.
About the Role We are looking for an experienced Senior Microsoft Dynamics 365 CRM Developer with strong expertise in MS Dynamics 365, Azure, and CRM customizations. The ideal candidate will have a proven track record of delivering end-to-end CRM solutions, leading teams, and driving best practices in CRM implementation and support. Key Responsibilities * Design, develop, and implement Microsoft Dynamics 365 CE Online solutions (Sales, Marketing, Service modules). * Develop and customize CRM plugins, workflows, Power Automate flows, and BPFs to support business processes. * Work with Azure Functions and integrate Dynamics CRM with third-party systems via Web APIs. * Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * Build, test, and maintain C# .NET components using TDD approach.
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Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
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About the Company You'll be joining a global leader in real estate services and technology solutions. Known for combining deep market expertise with cutting-edge innovation, this business is committed to modernising how property and investment decisions are made. You'll be part of a collaborative, forward-thinking environment that values creativity, accountability, and growth-where your contributions will directly shape the future of real estate technology. Role Responsibilities * Architect, build, and optimise scalable ETL pipelines for diverse datasets. * Onboard, document, and curate external datasets for internal use. * Perform data validation, forensic analysis, and troubleshooting. * Deliver high-quality, maintainable Python code and participate in peer reviews. * Collaborate with stakeholders and researchers to support analytics and product development.
About the Company You'll be joining a global leader in real estate services and technology solutions. Known for combining deep market expertise with cutting-edge innovation, this business is committed to modernising how property and investment decisions are made. You'll be part of a collaborative, forward-thinking environment that values creativity, accountability, and growth-where your contributions will directly shape the future of real estate technology. Role Responsibilities * Architect, build, and optimise scalable ETL pipelines for diverse datasets. * Onboard, document, and curate external datasets for internal use. * Perform data validation, forensic analysis, and troubleshooting. * Deliver high-quality, maintainable Python code and participate in peer reviews. * Collaborate with stakeholders and researchers to support analytics and product development.
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Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
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Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
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Senior Node.js Developer
Senior Node.js Developer
ARC IT Recruitment Ltd
SW1V, South West London, SW1W 9SJ
Up to £100,000 per annum
West London (Hybrid - 3 days in office) You will play a key role in shaping and expanding our cutting-edge technology stack. As a key player in our tech team, you'll help us scale and innovate, building on top of robust back-end servers and back-office systems. Gain full exposure to the entire development lifecycle, from planning and design to architecture, back-end, and front-end development. Working in a motivated, energetic team thats always learning and growing, you will be given career growth opportunities in a company which has the backing of a market-leading travel brand. * Collaborate closely with our systems architecture team to refine and enhance our technology infrastructure. * Get familiar with our current architecture and scaling technologies. * Build and implement new API systems integrating with ferry operators, third-party service providers, and more.
West London (Hybrid - 3 days in office) You will play a key role in shaping and expanding our cutting-edge technology stack. As a key player in our tech team, you'll help us scale and innovate, building on top of robust back-end servers and back-office systems. Gain full exposure to the entire development lifecycle, from planning and design to architecture, back-end, and front-end development. Working in a motivated, energetic team thats always learning and growing, you will be given career growth opportunities in a company which has the backing of a market-leading travel brand. * Collaborate closely with our systems architecture team to refine and enhance our technology infrastructure. * Get familiar with our current architecture and scaling technologies. * Build and implement new API systems integrating with ferry operators, third-party service providers, and more.
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Fullstack Engineer (Vue. Js & .Net) London hybrid working 2 days per week - Contract Opportunity We are seeking a talented Full Stack Developer with strong skills in Vue.js for front-end development and C# .NET for backend services, along with some knowledge or experience in SQL. You will be designing, building, and maintaining scalable web applications that integrate seamlessly with backend APIs and databases. Minimum Requirements * 5+ years of full stack development experience with Vue, TypeScript and C# .NET. * Strong understanding of Vue 3, Composition API, Pinia. * Proficiency in building RESTful APIs and integrating them with Vue applications. * Knowledge of Vitest (front-end), MSTest or xUnit (.NET) for unit testing and test-driven development practices. * Basic to intermediate SQL skills (queries, stored procedures, indexing).
Fullstack Engineer (Vue. Js & .Net) London hybrid working 2 days per week - Contract Opportunity We are seeking a talented Full Stack Developer with strong skills in Vue.js for front-end development and C# .NET for backend services, along with some knowledge or experience in SQL. You will be designing, building, and maintaining scalable web applications that integrate seamlessly with backend APIs and databases. Minimum Requirements * 5+ years of full stack development experience with Vue, TypeScript and C# .NET. * Strong understanding of Vue 3, Composition API, Pinia. * Proficiency in building RESTful APIs and integrating them with Vue applications. * Knowledge of Vitest (front-end), MSTest or xUnit (.NET) for unit testing and test-driven development practices. * Basic to intermediate SQL skills (queries, stored procedures, indexing).
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Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
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Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
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My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring o Drive best practices in coding, architecture, design patterns, and DevOps o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability
My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring o Drive best practices in coding, architecture, design patterns, and DevOps o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability
5 Days in office Cambridge Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
5 Days in office Cambridge Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
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An opportunity has arisen for an experienced Microsoft .Net Software Developer to join this organisation, and contribute to the development of its suite of systems, which are central to how they engage with their clients. Develop business applications for use within the business or by their clients. Provide technical enhancement for existing and new applications The successful candidate will have 3 or more years experience of application development. They will be well versed in structured programming, software testing and database optimisation. The candidate will have proven ability to understand a business requirement or process, and turn it into well written, well tested, documented and maintainable code.
An opportunity has arisen for an experienced Microsoft .Net Software Developer to join this organisation, and contribute to the development of its suite of systems, which are central to how they engage with their clients. Develop business applications for use within the business or by their clients. Provide technical enhancement for existing and new applications The successful candidate will have 3 or more years experience of application development. They will be well versed in structured programming, software testing and database optimisation. The candidate will have proven ability to understand a business requirement or process, and turn it into well written, well tested, documented and maintainable code.
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GraphQL Specialist – TypeScript | Cloud-Native | Contract (Outside)
GraphQL Specialist – TypeScript | Cloud-Native | Contract (Outside)
Staffworx Limited
Heathrow, TW5
market rates, outside IR35
Location:West London (Hybrid 2 days/week on site, hear Heathrow) Contract:6 months initial (extensions highly likely) Start:ASAP Eligibility:UK-based candidates only Rate:Market rates We re seeking aGraphQL-focused Software Engineerwho can design, implement and evolve high-performing APIs that scale. If crafting elegant GraphQL schemas, building robust TypeScript/Node.js services, and deploying to cloud-native environments is your idea of fun, this is your next project. What You ll Do * Design & developGraphQL APIs from schema design to production integration, ensuring performance, flexibility, and maintainability. * Buildscalable TypeScript/Node.js servicesthat integrate seamlessly with modern frontends and data sources. * ApplyDevOps best practicesto deliver through CI/CD pipelines (Jenkins, Concourse), Docker, Helm, and Kubernetes.
Location:West London (Hybrid 2 days/week on site, hear Heathrow) Contract:6 months initial (extensions highly likely) Start:ASAP Eligibility:UK-based candidates only Rate:Market rates We re seeking aGraphQL-focused Software Engineerwho can design, implement and evolve high-performing APIs that scale. If crafting elegant GraphQL schemas, building robust TypeScript/Node.js services, and deploying to cloud-native environments is your idea of fun, this is your next project. What You ll Do * Design & developGraphQL APIs from schema design to production integration, ensuring performance, flexibility, and maintainability. * Buildscalable TypeScript/Node.js servicesthat integrate seamlessly with modern frontends and data sources. * ApplyDevOps best practicesto deliver through CI/CD pipelines (Jenkins, Concourse), Docker, Helm, and Kubernetes.
Lynx are looking for an Enterprise Platform Architect for a 6-month contract with a leading organisation in Stratford, East London (2 days/week on-site). * Lead the application and integration architecture strategy * Define enterprise roadmaps, patterns, and governance processes * Provide architectural leadership across business and technology teams * Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices * Apply architectural frameworks (TOGAF/Zachman) to deliver strategic value Rate: £540/day Inside IR35 client runs payroll & covers employers NI Location: Stratford, East London (2 days/week on-site) If youre an experienced architect with a strategic mindset, please apply!
Lynx are looking for an Enterprise Platform Architect for a 6-month contract with a leading organisation in Stratford, East London (2 days/week on-site). * Lead the application and integration architecture strategy * Define enterprise roadmaps, patterns, and governance processes * Provide architectural leadership across business and technology teams * Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices * Apply architectural frameworks (TOGAF/Zachman) to deliver strategic value Rate: £540/day Inside IR35 client runs payroll & covers employers NI Location: Stratford, East London (2 days/week on-site) If youre an experienced architect with a strategic mindset, please apply!
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Full Stack Developer - React / Python London | Hybrid (2 days office and 3 days from home) £60K-£70K + Equity | Full-Time | Start-up We're a high-growth start-up building a leading healthcare! Looking for a Full Stack developer who loves working across the stack - React on the front end, Python on the back end. * Build responsive UIs in React * Develop APIs & services in Python (either Django/Flask/FastAPI) * Own features end-to-end * Help shape our tech stack * Strong React & Python skills * API & database experience * A proactive, problem-solving mindset * Ideally start-up or scale-up experience Why us? * Big impact from day one * Technical ownership & flexibility * Career growth + equity options Apply with your CV + GitHub Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions.
Full Stack Developer - React / Python London | Hybrid (2 days office and 3 days from home) £60K-£70K + Equity | Full-Time | Start-up We're a high-growth start-up building a leading healthcare! Looking for a Full Stack developer who loves working across the stack - React on the front end, Python on the back end. * Build responsive UIs in React * Develop APIs & services in Python (either Django/Flask/FastAPI) * Own features end-to-end * Help shape our tech stack * Strong React & Python skills * API & database experience * A proactive, problem-solving mindset * Ideally start-up or scale-up experience Why us? * Big impact from day one * Technical ownership & flexibility * Career growth + equity options Apply with your CV + GitHub Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions.
Backend Software Engineer C# .Net - Asset Management
Backend Software Engineer C# .Net - Asset Management
Client Server
The City, EC4
£100000 - £150000 per annum + bonus + benefits
Backend Software Engineer / Developer (C# .Net) London onsite to £150k Are you an experienced C#, backend focussed Software Engineer? You could be progressing your career in a senior, hands-on role at a global Asset Manager with c$3 million under management, earning substantial bonuses. As a Backend Software Engineer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with he strategy team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. You'll be based in plush City office on a fulltime basis, Monday to Friday. * You have expertise with C# .Net, ASP.Net development * You have a strong knowledge of databases (SQL or Oracle)
Backend Software Engineer / Developer (C# .Net) London onsite to £150k Are you an experienced C#, backend focussed Software Engineer? You could be progressing your career in a senior, hands-on role at a global Asset Manager with c$3 million under management, earning substantial bonuses. As a Backend Software Engineer within the trading engine team you'll collaborate to design and develop real-time trading systems, you'll often be collaborating with he strategy team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. You'll be based in plush City office on a fulltime basis, Monday to Friday. * You have expertise with C# .Net, ASP.Net development * You have a strong knowledge of databases (SQL or Oracle)
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Investran Application Specialist
Investran Application Specialist
Cobalt Recruitment.
City of London, London
£75000.00 - £95000 per annum
About the Company You'll be joining a global fund administrator with deep roots in private equity and a culture grounded in collaboration, integrity, and professional growth. Their technology function is embedded in strategic decision-making, and you'll have the autonomy and visibility to truly influence outcomes. * Maintain and enhance the Investran platform to support day-to-day operations and long-term scalability. * Build and manage integrations between Investran and other enterprise tools to ensure data accuracy and automation. * Lead technical troubleshooting, upgrades, and documentation to reduce downtime and support business continuity. * Translate operational needs into system improvements by working directly with internal stakeholders. * Extract and prepare data for analysis, reporting, and audits, driving better business decisions.
About the Company You'll be joining a global fund administrator with deep roots in private equity and a culture grounded in collaboration, integrity, and professional growth. Their technology function is embedded in strategic decision-making, and you'll have the autonomy and visibility to truly influence outcomes. * Maintain and enhance the Investran platform to support day-to-day operations and long-term scalability. * Build and manage integrations between Investran and other enterprise tools to ensure data accuracy and automation. * Lead technical troubleshooting, upgrades, and documentation to reduce downtime and support business continuity. * Translate operational needs into system improvements by working directly with internal stakeholders. * Extract and prepare data for analysis, reporting, and audits, driving better business decisions.
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Remote £100k - £130k Plexus has another great opportunity with one of our long-term clients. They believe that using crypto can enable a more equitable system for creators, fundamentally rediscovering the power of the internet. They are looking for a Backend Engineer to join one of their core product engineering teams with the ability to directly impact millions of user experiences in how they interactive with our products. * Work with team to build out new features in the product. * Build and maintain an API used by the product as well as external partners. * Communicate status, updates, blockers, etc., to cross functional stakeholders. * Participate in RFC and code review. * 3+ years of experience as an engineer. * Technical background in Python, GraphQL, and MongoDB. * Comfortable in moving across the stack when needed (Typescript/React/Next/Solidity)
Remote £100k - £130k Plexus has another great opportunity with one of our long-term clients. They believe that using crypto can enable a more equitable system for creators, fundamentally rediscovering the power of the internet. They are looking for a Backend Engineer to join one of their core product engineering teams with the ability to directly impact millions of user experiences in how they interactive with our products. * Work with team to build out new features in the product. * Build and maintain an API used by the product as well as external partners. * Communicate status, updates, blockers, etc., to cross functional stakeholders. * Participate in RFC and code review. * 3+ years of experience as an engineer. * Technical background in Python, GraphQL, and MongoDB. * Comfortable in moving across the stack when needed (Typescript/React/Next/Solidity)
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