51 to 75 of 91 API Design Jobs in Central London

are pleased to announce we're recruiting for a talented Senior Back End Developer to join our excellent team, based in Bank, London. The Senior Back End Developer will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team. About us SThree is the … markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future. What are the day-to-day tasks? Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines. Work with business stakeholders to understand opportunities and to design solutions that deliver the … required outcomes. Work with other technology teams to design and deliver end-to-end capabilities. Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems. Provide support to users and resolve systems issues. Configure CICD pipelines to support continuous delivery. Maintain infrastructure-as-code to build environments and applications. Focus on automation across More ❯

the order and risk management systems Collaborate with cross-functional teams on end-to-end features Mentor junior developers through code reviews and guidance Enhance UX and maintain consistent design principles across the platform Participate in Agile ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help … state management libraries (e.g., Zustand) Proficiency in writing clean, testable code with solid test coverage Experience with testing frameworks such as Vitest and Playwright Familiarity with REST or GraphQL API design Ability to write high-quality CSS Independent ownership of deliverables and strong communication skills in a collaborative environment Preferred Qualifications: Experience working on financial risk management software More ❯

the order and risk management systems Collaborate with cross-functional teams on end-to-end features Mentor junior developers through code reviews and guidance Enhance UX and maintain consistent design principles across the platform Participate in Agile ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help … state management libraries (e.g., Zustand) Proficiency in writing clean, testable code with solid test coverage Experience with testing frameworks such as Vitest and Playwright Familiarity with REST or GraphQL API design Ability to write high-quality CSS Independent ownership of deliverables and strong communication skills in a collaborative environment Preferred Qualifications: Experience working on financial risk management software More ❯

the order and risk management systems Collaborate with cross-functional teams on end-to-end features Mentor junior developers through code reviews and guidance Enhance UX and maintain consistent design principles across the platform Participate in Agile ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help … state management libraries (e.g., Zustand) Proficiency in writing clean, testable code with solid test coverage Experience with testing frameworks such as Vitest and Playwright Familiarity with REST or GraphQL API design Ability to write high-quality CSS Independent ownership of deliverables and strong communication skills in a collaborative environment Preferred Qualifications: Experience working on financial risk management software More ❯

the order and risk management systems Collaborate with cross-functional teams on end-to-end features Mentor junior developers through code reviews and guidance Enhance UX and maintain consistent design principles across the platform Participate in Agile ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help … state management libraries (e.g., Zustand) Proficiency in writing clean, testable code with solid test coverage Experience with testing frameworks such as Vitest and Playwright Familiarity with REST or GraphQL API design Ability to write high-quality CSS Independent ownership of deliverables and strong communication skills in a collaborative environment Preferred Qualifications: Experience working on financial risk management software More ❯

the order and risk management systems Collaborate with cross-functional teams on end-to-end features Mentor junior developers through code reviews and guidance Enhance UX and maintain consistent design principles across the platform Participate in Agile ceremonies including stand-ups, backlog refinement, and retrospectives Evaluate and improve the frontend architecture, including state management and API integrations Help … state management libraries (e.g., Zustand) Proficiency in writing clean, testable code with solid test coverage Experience with testing frameworks such as Vitest and Playwright Familiarity with REST or GraphQL API design Ability to write high-quality CSS Independent ownership of deliverables and strong communication skills in a collaborative environment Preferred Qualifications: Experience working on financial risk management software More ❯

Leadership in Scalable Systems Are you a technical leader ready to guide a high-performing engineering team? Do you enjoy mentoring others while staying close to architecture and system design? Interested in shaping tools that support real-world infrastructure at scale? We’re recruiting for a Lead Software Engineer on behalf of a fast-growing technology company whose platform … others grow. Why This Role is Great Lead a talented team delivering software that supports the installation, configuration and maintenance of distributed systems at scale Balance hands-on technical design with mentoring and team development Collaborate across product, cloud, QA and systems engineering to deliver robust solutions Contribute to technical strategy, system architecture and future roadmaps Create real value … backend software projects TypeScript or Node.js development, or similar backend technologies Designing and deploying services in a modern cloud environment Working with databases (SQL or NoSQL) and scalable system design Agile delivery and team collaboration Building for maintainability, performance and clear documentation Experience or interest in the following would also be valuable: Managing or supporting connected devices or remote More ❯

Leadership in Scalable Systems Are you a technical leader ready to guide a high-performing engineering team? Do you enjoy mentoring others while staying close to architecture and system design? Interested in shaping tools that support real-world infrastructure at scale? We’re recruiting for a Lead Software Engineer on behalf of a fast-growing technology company whose platform … others grow. Why This Role is Great Lead a talented team delivering software that supports the installation, configuration and maintenance of distributed systems at scale Balance hands-on technical design with mentoring and team development Collaborate across product, cloud, QA and systems engineering to deliver robust solutions Contribute to technical strategy, system architecture and future roadmaps Create real value … backend software projects TypeScript or Node.js development, or similar backend technologies Designing and deploying services in a modern cloud environment Working with databases (SQL or NoSQL) and scalable system design Agile delivery and team collaboration Building for maintainability, performance and clear documentation Experience or interest in the following would also be valuable: Managing or supporting connected devices or remote More ❯

Leadership in Scalable Systems Are you a technical leader ready to guide a high-performing engineering team? Do you enjoy mentoring others while staying close to architecture and system design? Interested in shaping tools that support real-world infrastructure at scale? We’re recruiting for a Lead Software Engineer on behalf of a fast-growing technology company whose platform … others grow. Why This Role is Great Lead a talented team delivering software that supports the installation, configuration and maintenance of distributed systems at scale Balance hands-on technical design with mentoring and team development Collaborate across product, cloud, QA and systems engineering to deliver robust solutions Contribute to technical strategy, system architecture and future roadmaps Create real value … backend software projects TypeScript or Node.js development, or similar backend technologies Designing and deploying services in a modern cloud environment Working with databases (SQL or NoSQL) and scalable system design Agile delivery and team collaboration Building for maintainability, performance and clear documentation Experience or interest in the following would also be valuable: Managing or supporting connected devices or remote More ❯

Leadership in Scalable Systems Are you a technical leader ready to guide a high-performing engineering team? Do you enjoy mentoring others while staying close to architecture and system design? Interested in shaping tools that support real-world infrastructure at scale? We’re recruiting for a Lead Software Engineer on behalf of a fast-growing technology company whose platform … others grow. Why This Role is Great Lead a talented team delivering software that supports the installation, configuration and maintenance of distributed systems at scale Balance hands-on technical design with mentoring and team development Collaborate across product, cloud, QA and systems engineering to deliver robust solutions Contribute to technical strategy, system architecture and future roadmaps Create real value … backend software projects TypeScript or Node.js development, or similar backend technologies Designing and deploying services in a modern cloud environment Working with databases (SQL or NoSQL) and scalable system design Agile delivery and team collaboration Building for maintainability, performance and clear documentation Experience or interest in the following would also be valuable: Managing or supporting connected devices or remote More ❯

Leadership in Scalable Systems Are you a technical leader ready to guide a high-performing engineering team? Do you enjoy mentoring others while staying close to architecture and system design? Interested in shaping tools that support real-world infrastructure at scale? We’re recruiting for a Lead Software Engineer on behalf of a fast-growing technology company whose platform … others grow. Why This Role is Great Lead a talented team delivering software that supports the installation, configuration and maintenance of distributed systems at scale Balance hands-on technical design with mentoring and team development Collaborate across product, cloud, QA and systems engineering to deliver robust solutions Contribute to technical strategy, system architecture and future roadmaps Create real value … backend software projects TypeScript or Node.js development, or similar backend technologies Designing and deploying services in a modern cloud environment Working with databases (SQL or NoSQL) and scalable system design Agile delivery and team collaboration Building for maintainability, performance and clear documentation Experience or interest in the following would also be valuable: Managing or supporting connected devices or remote More ❯

a fit. You’ll be working closely with infrastructure, architecture, and infosec teams to support high-availability production systems. The role also involves guiding CI/CD improvements, REST API design, and steering collaborative technical decisions across squads. What they’re looking for: Proven experience supporting large-scale, business-critical systems in the finance industry (all areas of … Comfortable working with legacy systems and large enterprise environments Confident in leading technical conversations across multiple engineering disciplines Experience with CI/CD pipelines and modern deployment practices REST API design This is a great opportunity for an experienced Java Developer to join a prestigious financial player. If you’re someone who thrives in complex environments and enjoys More ❯

a fit. You’ll be working closely with infrastructure, architecture, and infosec teams to support high-availability production systems. The role also involves guiding CI/CD improvements, REST API design, and steering collaborative technical decisions across squads. What they’re looking for: Proven experience supporting large-scale, business-critical systems in the finance industry (all areas of … Comfortable working with legacy systems and large enterprise environments Confident in leading technical conversations across multiple engineering disciplines Experience with CI/CD pipelines and modern deployment practices REST API design This is a great opportunity for an experienced Java Developer to join a prestigious financial player. If you’re someone who thrives in complex environments and enjoys More ❯

Architect joint solutions and conduct technical audits Build applications, prototypes, and POCs Create enablement content: code samples, documentation, tutorials Provide ongoing support including bug resolution and performance optimization Influence API design and contribute feedback to product roadmaps Requirements: BS/MS in Computer Science or equivalent work experience 5+ years in web, software, or mobile app development Proficiency More ❯

higher in Computer Science or related discipline Experienced full-stack engineer (5+ years) with strong Python backend skills and modern frontend framework expertise, particularly React. Solid database knowledge RESTful API design experience Familiarity with cloud platforms Docker containerisation What's In It For Me? Salary of £70,000 - £90,000 dependent on experience Hybrid Work - 2/ More ❯

higher in Computer Science or related discipline Experienced full-stack engineer (5+ years) with strong Python backend skills and modern frontend framework expertise, particularly React. Solid database knowledge RESTful API design experience Familiarity with cloud platforms Docker containerisation What's In It For Me? Salary of £70,000 - £90,000 dependent on experience Hybrid Work - 2/ More ❯

Java Solution Technical Architect to join their growing team in the healthcare sector. In this role, you will take a high-level strategic approach to architecture, ensuring the overall design of complex systems is optimized for scalability, security, and performance. You will collaborate closely with stakeholders, engineers, and product owners, acting as a technical thought leader and guiding the … Key Responsibilities: Architectural Leadership: Define and lead the architecture of complex, large-scale systems using modern Java technologies, ensuring alignment with the businesss strategic goals. Provide high-level architecture design decisions for microservices, APIs, and cloud solutions, ensuring adherence to best practices and industry standards. This role will be largely hands-off, however liaising and communicating with engineers within … mentor to senior developers and engineers, fostering a culture of learning and continuous improvement. Guide and collaborate with product owners to ensure that technical decisions align with business objectives. Design and Strategy: Design scalable, efficient, and secure microservices-based architectures that can scale with business needs. Develop strategies for integrating with existing systems, and ensure APIs are designed More ❯

impact how users interact with AI in a professional capacity. ✅ We're Looking For: 3+ years experience with Node.js and TypeScript Solid understanding of backend architecture , databases (PostgreSQL), and API design Exposure to React on the front end (bonus for design system knowledge) Experience with cloud infrastructure (preferably AWS) A builder’s mindset: you're curious, autonomous More ❯

be considered Deep familiarity with AWS (Lambda, DynamoDB, SQS, SNS, ECS) Proven ability to take product requirements and deliver production-ready systems Background in event-driven architecture and RESTful API design 🌍 Location: London (Hybrid flexibility available) If you’re passionate about building high-impact systems and want to be part of a mission-driven, product-focused team, we More ❯

be considered Deep familiarity with AWS (Lambda, DynamoDB, SQS, SNS, ECS) Proven ability to take product requirements and deliver production-ready systems Background in event-driven architecture and RESTful API design 🌍 Location: London (Hybrid flexibility available) If you’re passionate about building high-impact systems and want to be part of a mission-driven, product-focused team, we More ❯

This is a critical opportunity to lead the implementation of a brand-new system and ensure its seamless integration across the business. You will be responsible for leading the design and implementation of Azure solutions, with a strong focus on API integration, Azure Integration Services, and Infrastructure as Code using Bicep. Proficiency in C#/.NET is essential … p/d. Hybrid role in London office. Key Responsibilities: Lead the implementation of Azure cloud platform Develop robust APIs using OpenAPI, JSON, and Azure Integration Services (Logic Apps, API Management, Service Bus) Write clean, maintainable code in C#/.NET for cloud-native applications and integrations Define and implement Infrastructure as Code using Bicep Collaborate with architects, DevOps … the engineering team Requirements: Extensive hands-on experience with Microsoft Azure, particularly Azure integration services Proven track record of leading Azure solution implementations in enterprise environments Strong expertise in API design and integration, including OpenAPI/Swagger, JSON, and RESTful services Solid experience with C#/.NET for backend development and integration Deep understanding of Infrastructure as Code More ❯

This is a critical opportunity to lead the implementation of a brand-new system and ensure its seamless integration across the business. You will be responsible for leading the design and implementation of Azure solutions, with a strong focus on API integration, Azure Integration Services, and Infrastructure as Code using Bicep. Proficiency in C#/.NET is essential … p/d. Hybrid role in London office. Key Responsibilities: Lead the implementation of Azure cloud platform Develop robust APIs using OpenAPI, JSON, and Azure Integration Services (Logic Apps, API Management, Service Bus). Write clean, maintainable code in C#/.NET for cloud-native applications and integrations. Define and implement Infrastructure as Code using Bicep. Collaborate with architects … the engineering team. Requirements: Extensive hands-on experience with Microsoft Azure, particularly Azure integration services Proven track record of leading Azure solution implementations in enterprise environments. Strong expertise in API design and integration, including OpenAPI/Swagger, JSON, and RESTful services. Solid experience with C#/.NET for backend development and integration. Deep understanding of Infrastructure as Code More ❯

As Co-founder & CTO , you’ll work side-by-side with the Founder & CEO to bring Tetto from concept to product-market fit and beyond. You’ll lead the design and build of our MVP, data infrastructure, and API-first architecture, setting the foundation for how we acquire, underwrite, and serve customers in a way that’s 10x … platform from day one Build and launch the MVP using lean, modern technologies (utilising low/no-code, AI-powered IDEs, external APIs, pre-built insurance tools where useful) Design, integrate, and manage data pipelines across property data, IoT, geospatial risk, customer behavior, and third-party APIs Build Tetto’s own API layer , allowing seamless embedding into distribution … staff-level engineer in a startup or fast-scaling tech company Proven ability to ship MVPs fast , with a pragmatic approach to technical debt and iteration Deep understanding of API design and integration , including building API endpoints that can embed into third-party platforms Experience with data architecture and enrichment , particularly around consumer profiling, risk modeling, or More ❯

and cloud architecture, combined with the vision to build scalable, secure, and performant systems. Key Responsibilities Architect and lead the development of modern web applications using React and TypeScript Design scalable, secure, and resilient systems on AWS Collaborate closely with product, design, and data teams to deliver high-quality user experiences Mentor and guide a small team of … scale-up or tech-forward company Deep expertise in React , TypeScript , and modern JavaScript frameworks Strong experience designing and deploying web applications on AWS Excellent understanding of application architecture, API design, and cloud-native best practices Comfortable working autonomously and making strategic technical decisions Based in the UK and eligible to work without sponsorship Bonus Skills Experience building More ❯

and cloud architecture, combined with the vision to build scalable, secure, and performant systems. Key Responsibilities Architect and lead the development of modern web applications using React and TypeScript Design scalable, secure, and resilient systems on AWS Collaborate closely with product, design, and data teams to deliver high-quality user experiences Mentor and guide a small team of … scale-up or tech-forward company Deep expertise in React , TypeScript , and modern JavaScript frameworks Strong experience designing and deploying web applications on AWS Excellent understanding of application architecture, API design, and cloud-native best practices Comfortable working autonomously and making strategic technical decisions Based in the UK and eligible to work without sponsorship Bonus Skills Experience building More ❯