26 to 39 of 39 API Design Jobs in London

as a Lead Full Stack Develope r What you’ll do: • Craft sleek, responsive UIs with React • Build robust APIs & backend services in Python (FastAPI or Django/Flask) • Design, develop, and own features end-to-end • Influence the evolution of our tech stack • Work with cutting-edge tools: GCP/AWS/Azure, MySQL, Firestore, Docker/Kubernetes … security best practices in a regulated space • Explore AI & machine learning (LLMs, LangChain, TensorFlow, PyTorch) What you’ll bring: • Strong React & Python (FastAPI/Django/Flask) experience • Solid API design & database skills • Start-up or scale-up mindset, adaptable and hands-on • Passion for AI and innovation in healthcare Why join? • Build something that genuinely changes lives More ❯

greenfield, lab-first environment, you will prototype, iterate, and deploy solutions that adhere to the highest standards of performance, security, and compliance in a regulated financial setting. Key Responsibilities: Design and develop modern, responsive front-end applications from the ground up using React, TypeScript, and Next.js. Build secure, performant user interfaces that integrate with LLM APIs (e.g., Gemini, Azure … systems. Implement advanced front-end security features, including token handling, session management, data masking, and audit logging. Translate UX/UI designs into modular, reusable components aligned with enterprise design systems. Integrate front-end applications with REST/GraphQL APIs, WebSockets, and backend services. Collaborate closely with AI engineers, backend developers, and cloud architects to deliver end-to-end … regular code reviews. Deploy applications to GCP (Firebase, Cloud Run) and Azure App Services using CI/CD pipelines hardened for security and compliance. Participate in code reviews, technical design discussions, and architecture planning sessions. Required Skills & Experience: Proven experience building secure, production-grade front-end applications in regulated environments (e.g., finance, healthcare, government). Strong proficiency in modern More ❯

will play a crucial role in the development of integrations that will have a real impact on the business and its customers. Responsibilities: Collaborate with cross-functional teams to design, develop, and implement Go-based integrations. Ensure the stability, scalability, and security of integration solutions. Troubleshoot and resolve integration issues in a timely manner. Maintain and support existing integrations … as needed. Essential Skills & Experience: Strong experience in software development using Go programming language. Proficiency in API design and development. Familiarity with cloud services and microservices architecture. Solid understanding of data structures and algorithms. Excellent problem-solving skills and attention to detail. Desirable Skills & Experience: Previous experience with Docker and Kubernetes. Knowledge of message queuing systems like Kafka More ❯

you will become part of a small, accomplished team with a proven track record of successfully building companies from the ground up. They are now seeking a developer to design the architecture and lead the development of back-end services and web applications.The ideal candidate will have a robust background in AWS, Node.js, and React, along with expertise in … NoSQL databases, RESTful API design and development, product development, and deployment of applications on both iOS and Android platforms. A strong business orientation and pragmatic approach are essential, with a demonstrated ability to align deliverables with corporate vision while understanding and maximizing their business value.This is an excellent opportunity for a Full Stack Developer to join a company More ❯

you will become part of a small, accomplished team with a proven track record of successfully building companies from the ground up. They are now seeking a developer to design the architecture and lead the development of back-end services and web applications. The ideal candidate will have a robust background in AWS, Node.js, and React, along with expertise … in NoSQL databases, RESTful API design and development, product development, and deployment of applications on both iOS and Android platforms. A strong business orientation and pragmatic approach are essential, with a demonstrated ability to align deliverables with corporate vision while understanding and maximizing their business value. This is an excellent opportunity for a Full Stack Developer to join More ❯

Experience working closely with product teams and designing for real users Strong frontend skills (JavaScript/Typescript, React/Angular, HTML) and backend expertise (Node.js, Python) Proven experience in API design and system integration Proficiency with Microsoft Azure and familiarity with databases, IAM, containers, and deployment tools Comfortable with rapid prototyping tools (e.g., Figma) Solid understanding of the … platforms Support low-code solutions, especially within Power Platform Agile & Iterative Development Work within a modern agile framework Participate in backlog grooming, technical scoping, and story writing Engage in design sessions, code reviews, and retrospectives Security, Quality & Operations Ensure compliance with security, privacy, and operational standards Monitor and improve the health of production code Enhance testing and deployment pipelines More ❯

debugging. Familiarity with clean code practices. Proficient in working with relational databases such as MySQL and Microsoft SQL Server, as well as non-relational databases like MongoDB. Ability to design, implement, and optimize database schemas and queries. Understanding of CI/CD pipelines and tools such as GitLab CI/CD, Jenkins, or CircleCI. Nice-to-Haves Experience in … API design and development using REST, GraphQL, or SOAP. Experience with Progressive Web Applications. More ❯

debugging. Familiarity with clean code practices. Proficient in working with relational databases such as MySQL and Microsoft SQL Server, as well as non-relational databases like MongoDB. Ability to design, implement, and optimize database schemas and queries. Understanding of CI/CD pipelines and tools such as GitLab CI/CD, Jenkins, or CircleCI. Nice-to-Haves Experience in … API design and development using REST, GraphQL, or SOAP. Experience with Progressive Web Applications. More ❯

Backend Engineer (Python/Django) | Hybrid 1 | Full-time We're looking for a Mid-Level Backend Engineer to join a fast-growing tech team. You'll design, build, and maintain scalable Back End services and APIs, contributing to high-performing, secure, and user-friendly applications. What you'll bring: 3+ years Back End development in production Strong Python … Django (4+ years) SQL database expertise & optimisation skills REST API design experience CI/CD, Git, and testing familiarity Strong collaboration and time management skills Nice to have: Fintech, payments, E-commerce, or AI coding assistant experience. Role responsibilities: Collaborate with all relevant departments to deliver end to end features Design, build and maintain scalable Back End More ❯

financial services. We're looking for an experienced eFX Software Engineer to build secure, high-performance trading systems in a collaborative, inclusive, and agile environment. What you'll do: Design and develop low-latency, fault-tolerant trading architectures Lead complex software initiatives using modern Java patterns (low-GC, lock-free) Collaborate across teams to deliver robust trading platforms and … optimisation, and CPU/memory management In-depth knowledge of networking protocols (TCP, UDP, Multicast, FIX) Experience in electronic/algorithmic trading and FX products Background in automated testing, API design, and DevOps workflows Ability to translate business needs into scalable technical solutions Flexible working options available. This is your chance to work on impactful projects and shape More ❯

s APIs and SDKs, ensuring they empower customers to programmatically interact with our platform in scalable, secure, and developer-friendly ways. Shape the developer experience: Partner with engineering and design to ensure our APIs and SDKs are consistent, intuitive, well-documented, and performant. Interoperate with the modern data stack: Ensure first-class integration with data warehouses, lakes, and real … time streaming platforms Support enterprise scale: Design for performance, reliability, security, and compliance requirements of large enterprises. Engage with customers and partners: Gather feedback from data engineers, architects, and developers from both our customer base and partner ecosystem to ensure our APIs and SDKs solve real-world problems that fit naturally into enterprise data ecosystems. Establish success measures: Define … and track adoption metrics, usage analytics, and developer satisfaction scores to ensure continuous improvement. Stay ahead of industry trends: Monitor advancements in data integration, streaming, and SDK/API design to keep Ataccama competitive and developer-friendly. Is This You? Industry experience: Experience in B2B and SaaS product companies is a must Proven experience: 5-7+ years More ❯

maintainable code. Hands-on experience building backend services with Node.js. Knowledge of contemporary frontend and backend frameworks, with the ability to adapt to new technologies. Strong grasp of RESTful API design and efficient mobile-to-server communication practices. The salary for this Full Stack Developer role will be up to £80,000 per annum. The company are rapidly More ❯

work history as an MS Solutions Architect + Experience with SolarWinds & ServiceNow highly desirable Overview We're looking for 2 Solution Architects to join a major customer engagement, providing design and assurance across multiple technology workstreams. This is a hands-on role where you'll bring technical depth, architectural oversight, and the ability to challenge and shape solutions that … deliver lasting value. Key Responsibilities Lead design and assurance activities across cloud and on-premise environments. Work closely with stakeholders to define solution architectures that align with business objectives. Provide technical governance and assurance across project delivery. Evaluate and recommend technologies, ensuring scalable, secure, and cost-effective designs. Collaborate with engineering teams to ensure solutions are implemented to specification. … Produce high-quality architectural documentation, design patterns, and roadmaps. Core Skills & Experience Proven background as a Solution Architect within enterprise-scale environments. Strong expertise in Microsoft technologies (cloud and on-premise). Experience in hybrid cloud architectures (Azure preferred). Knowledge of infrastructure monitoring (e.g., SolarWinds). Familiarity with ITSM platforms such as ServiceNow. Strong stakeholder management and communication More ❯

work history as an MS Solutions Architect + Experience with SolarWinds & ServiceNow highly desirable Overview We're looking for 2 Solution Architects to join a major customer engagement, providing design and assurance across multiple technology workstreams. This is a hands-on role where you'll bring technical depth, architectural oversight, and the ability to challenge and shape solutions that … deliver lasting value. Key Responsibilities Lead design and assurance activities across cloud and on-premise environments. Work closely with stakeholders to define solution architectures that align with business objectives. Provide technical governance and assurance across project delivery. Evaluate and recommend technologies, ensuring scalable, secure, and cost-effective designs. Collaborate with engineering teams to ensure solutions are implemented to specification. … Produce high-quality architectural documentation, design patterns, and roadmaps. Core Skills & Experience Proven background as a Solution Architect within enterprise-scale environments. Strong expertise in Microsoft technologies (cloud and on-premise). Experience in hybrid cloud architectures (Azure preferred). Knowledge of infrastructure monitoring (e.g., SolarWinds). Familiarity with ITSM platforms such as ServiceNow. Strong stakeholder management and communication More ❯