1 to 25 of 64 API Design Jobs in London

API Platform Architect – Azure, Kubernetes, Terraform, API Management (Hands-On Role) Overview We are seeking an experienced and highly technical API Platform Architect to lead the architecture, engineering, and continuous evolution of our enterprise API Platform. This role is fully hands-on , combining deep expertise … Azure cloud services, Kubernetes, Terraform, API security, and distributed systems with the ability to guide, review, and contribute to .NET Core API development practices . The architect will define and maintain the vision and standards for the platform while actively engaging in coding, troubleshooting, design reviews ...

Solutions Architect - API Integration - Financial Services - FinTech Excellent opportunity opens for a hands on Solutions Architect to join a fast growing FinTech organisation and play a pivotal role in designing, implementing, and governing modern API-led and integration-driven solutions. You will work closely with product, engineering … understand requirements, define scalable architectures, and enable seamless connectivity between internal platforms, third-party providers, and external ecosystems. The ideal candidate will bring strong API and integration expertise, a modern cloud mindset, and the strategic vision required to support high-growth, technology-led financial services environments. Key Responsibilities: Solution ...

London. 12+mths contract, 2 days onsite/3 days remote, PAYE/Umbrella options. Salesforce & ReactNative - Salesforce and .or ReactNative (Web), Java, TDD, RESTful API design & build, OAS/YAML, Unit Testing, GitLab, CI/CD Pipelines, SonarQube, Veracode, Jira, Confluence Open Stack BA - Salesforce, ReactNative (Web), Java … RESTful API design & build, OAS/YAML, Unit Testing, GitLab, CI/CD Pipelines, Jira, Confluence API Developer - Java, TDD, RESTful API design & build, OAS/YAML, GitLab, CI/CD Pipelines, Java Database-Hibernate/JPA, SonarQube, Veracode, Jira, Confluence Click Apply ...

12+mths contract, 2 days onsite/3 days remote, PAYE/Umbrella options. Open Stack/Salesforce & ReactNative - Salesforce, ReactNative (Web), Java, TDD, RESTful API design & build, OAS/YAML, Unit Testing, GitLab, CI/CD Pipelines, SonarQube, Veracode, Jira, Confluence Open Stack BA - Salesforce, ReactNative (Web), Java … RESTful API design & build, OAS/YAML, Unit Testing, GitLab, CI/CD Pipelines, Jira, Confluence API Developer - Java, TDD, RESTful API design & build, OAS/YAML, GitLab, CI/CD Pipelines, Java Database-Hibernate/JPA, SonarQube, Veracode, Jira, Confluence Click Apply ...

Java/Microservices/API design/LLMs/AI/Claude Code/Copilot Role: Senior Software Engineer Company: Financial Services Location: London - Hybrid 3 days per week Salary: up to £120,000 Join a Service Modernisation team driving AI-first software development in financial services. This … development tools (e.g. Claude Code, GitHub Copilot, LLMs) Experience with MCP, AI automation, or agentic AI systems Strong understanding of microservices and API design Java/Microservices/API design/LLMs/AI/Claude Code/Copilot ...

Java/Microservices/API design/LLMs/AI/Claude Code/Copilot Role: Senior Software Engineer Company: Financial Services Location: London - Hybrid 3 days per week Salary: up to £120,000 Join a Service Modernisation team driving AI-first software development in financial services. This … development tools (e.g. Claude Code, GitHub Copilot, LLMs) Experience with MCP, AI automation, or agentic AI systems Strong understanding of microservices and API design Java/Microservices/API design/LLMs/AI/Claude Code/Copilot ...

seen as the technical leader within a high-performing team, and will work closely with the overall solution architect and lead developers to design, deliver, govern, and ensure quality of new solutions built on or integrated into the BigCommerce platform. The candidate will be required to work closely with … delivered to our principles, standards, and best practices. The candidate should be business focused and have a proven track record of successful technical design and delivery using BigCommerce as the cornerstone of the solution. What You'll Be Doing Producing and owning innovative and well-engineered technical solutions ...

Senior Azure API Engineer Outside IR35 | £(Apply online only)/day | Remote/Hybrid UK The Role Lead the design and delivery of enterprise-grade API solutions on Azure. You'll architect scalable, secure API platforms that unlock business value from data and drive monetization opportunities. … Platform team, you'll build the critical integration layer connecting internal teams and external customers to consistent, reliable data services. What You'll Do Design and operationalise a lean, zero-trust API platform on Azure API Management Architect microservices and event-driven integration flows at scale Define ...

Senior Azure API Engineer Outside IR35 | £550-750/day | Remote/Hybrid UK You must have the right to work in the UK The Role Lead the design and delivery of enterprise-grade API solutions on Azure. You'll architect scalable, secure API platforms that … Platform team, you'll build the critical integration layer connecting internal teams and external customers to consistent, reliable data services. What You'll Do Design and operationalise a lean, zero-trust API platform on Azure API Management Architect microservices and event-driven integration flows at scale Define ...

pressure; make frame-time and latency predictable across device classes Define and monitor SDK health metrics at scale (crashes, ANRs, error rates, perf envelopes) API design and developer experience Design clear, stable, Kotlin-first public APIs (versioned, well-documented, testable) Implement best practices for networking, auth … fixes and verify via dashboards Provide concise developer-facing change notes/migration snippets to the Solutions Engineer for release notes Roadmap contribution Co-design the next generation of the Android Captur SDK for release at the end of Q2 Champion performance budgets and device-class targets during planning ...

shaping Meteor's digital future. Key Responsibilities Lead, mentor, and inspire a team of developers, fostering a culture of technical excellence and continuous improvement Design, develop, and maintain high-quality software solutions across the full stack Architect and implement systems using .NET, JavaScript, SQL, and modern frontend frameworks Oversee … API design and integrations, ensuring secure and efficient data exchange Translate business and stakeholder requirements into clear technical solutions Conduct code reviews and ensure adherence to coding, security, and quality standards Drive continuous improvement in development workflows, testing, and deployment practices Support the professional development of team members ...

Role We’re hiring a Backend Engineer to build the core infrastructure behind Revax’s AI-native platform for professional services. You’ll design, optimise, and scale the systems that power multi-agent drafting, knowledge graphs, and auditable AI workflows used by accountants, tax advisors, and consultants at leading … graphs, and real-world enterprise workflows. What You’ll Do Build & own core backend systems · Build and optimise databases for complex, real-world data · Design and implement APIs using FastAPI for AI workflows and product features · Build and scale LangGraph-based multi-agent systems with checkpointing, retries, and observability ...

API Developer - London Atrium EMEA are looking for several API Developers to support the Development teams onsite with a client in London. 12+mths contract, 2 days onsite/3 days remote, PAYE/Umbrella options. - API Developer - Java, TDD, RESTful API design & build, OAS/…/CD Pipelines, Java Database-Hibernate/JPA, SonarQube, Veracode, Jira, Confluence Click Apply now or contact Lianne to be considered for the API Developer - London role ...

Ireland providing specialist services to a wide range of blue-chip clients. The role We are seeking technical polyglots who enjoy both technical architectural design, hands-on coding and peer reviews, though also like the idea of the equally important social/client-facing aspect of the role. … solution architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority (TDA) for delivery of technical stories and produce technical documentation artefacts to support the delivery process. Main Responsibilities Duties will include: The design ...

looking for an experienced Developer with strong computer vision experience to design, build, and maintain a high-performance Software Development Kit (SDK) used in security-critical mobile applications. This role sits at the intersection of mobile engineering, applied computer vision, and SDK architecture , and will play a key role … delivering reusable, secure, and developer-friendly components used by third-party teams and partners. Key Responsibilities SDK Design & Development Design and develop a cross-platform mobile SDK (iOS & Android) using Swift and Kotlin Create clean, modular, well-documented SDK APIs for external developers Ensure the SDK is easy ...

will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important. Responsibilities Working in a team of Front-End engineers Writing clear & concise code Working closely with Back-End engineers Participate … architecture design code reviews API design with the Back-End engineers and other team members to establish more functional, cohesive code Create, maintain documentation while implementing the best coding practices standards Hands-on approach Participation in sprint rituals What you’ll need 6+ years experience developing large ...

Months London Onboarding after BGV completion We are looking for an experienced Infrastructure Engineer with deep Google Cloud Platform (GCP) networking expertise to design, build, automate, and operate cloud network services at scale. The role includes DNS as a Service offering, IP Address Management (IPAM), integrations with ServiceNow, FinOps … compliance. Youll partner with Operations, Security, FinOps, and Platform Engineering to deliver reliable, compliant, and cost-optimized cloud networking services. Key Responsibilities Network Design & Operations (GCP) Design, implement, and operate GCP networking: VPCs, subnets, routing (Cloud Router/BGP), VPC peering, Private Service Connect, Cloud NAT, Cloud Firewall ...

core stack includes: The Engine: Expert-level C# and .NET Core mastery. Architecture: Deep understanding of SOA (Service Oriented Architecture) and complex Object-Oriented design patterns. System Dynamics: Specialized knowledge of concurrency, asynchrony, and parallelism —essential for real-time transactional processing. Data & Web: High proficiency in SQL Server … API design, and modern front-end fundamentals (HTML/CSS/JS). Reliability: A strict practitioner of TDD (Test Driven Development) and robust CI/CD processes. Desired Innovations Our client is actively modernizing. Exposure to the following is highly valued: Cloud & Orchestration: Azure ecosystems, Docker ...

practice methodologies, designing and delivering innovative, automated solutions to complex challenges. Interpret and apply security policies, ensuring all implemented solutions meet required security standards. Design and implement highly available, scalable, and resilient systems. Desirable Skills and Technologies Proven experience with cloud platforms, including AWS, Azure, and Azure Virtual Desktop. … Experience deploying applications within cloud architectures, Hands-on experience with web application services. Familiarity with Test-Driven Development and Behaviour-Driven Development Experience in API design, development, and integration. Knowledge of monitoring and observability systems. Understanding of modern digital delivery processes and agile methodologies. Working knowledge ...

practice methodologies, designing and delivering innovative, automated solutions to complex challenges. Interpret and apply security policies, ensuring all implemented solutions meet required security standards. Design and implement highly available, scalable, and resilient systems. Desirable Skills and Technologies Proven experience with cloud platforms, including AWS, Azure, and Azure Virtual Desktop. … Experience deploying applications within cloud architectures, Hands-on experience with web application services. Familiarity with Test-Driven Development and Behaviour-Driven Development Experience in API design, development, and integration. Knowledge of monitoring and observability systems. Understanding of modern digital delivery processes and agile methodologies. Working knowledge ...

work across frontend and backend systems, help shape technical solutions, and ensure best practices are followed throughout the development lifecycle. Key Responsibilities Design, develop, and maintain high-quality software solutions across the full stack Build and integrate APIs, ensuring secure and efficient data exchange Develop user interfaces using modern … Requirements Proven experience as a full-stack developer Strong proficiency in .NET (C#), JavaScript, and modern frontend frameworks Solid experience with SQL databases and API design and integration Excellent problem-solving, communication, and organisational skills Ability to work proactively on independent projects and collaboratively within a team Familiarity ...

journey. Engineering at Duffel We're building tools to simplify travel distribution, search, and booking through one seamless API. The technical challenge? Design a beautiful API, then integrate it with hundreds of travel providers - each with different systems and requirements - whilst delivering a fantastic developer experience. We work … Thrive Here If: ✅ You're passionate about designing beautiful APIs and creating great developer experiences ✅ You have a high bar for code quality and API design ✅ You have opinions on good engineering standards and processes as we define ours at Duffel ✅ You think big picture - making tradeoffs between ...

APIs that transform patient data into actionable health recommendations. This role offers the opportunity to shape the full mobile experience while collaborating with product, design, and clinical teams to deliver features that meaningfully improve patient outcomes. What You'll Do Build and ship features for iOS and Android mobile … Connect, enabling seamless data synchronization from digital scales, blood pressure cuffs, activity trackers, and continuous glucose monitors (CGMs) Partner with machine learning engineers to design and implement client-side integrations with internal AI APIs for data analysis, personalization, and clinical decision support Drive end-to-end feature delivery ...

addition to contributing to feature development, you will play a role in shaping the technology and process strategies, and occasionally lead innovation or software design initiatives. Key Responsibilities: Develop new features with a strong focus on high-quality code. Conduct peer code reviews to ensure quality and adherence … with tech leads, engineers, testers, and other personnel to deliver high-quality products. Take ownership of initiatives related to innovation or addressing technical debt. Design, document, and communicate system solutions with a balanced focus on time, quality, cost, and performance. Collaborate with colleagues across the organization to gain ...

journey. Engineering at Duffel We're building tools to simplify travel distribution, search, and booking through one seamless API. The technical challenge? Design a beautiful API, then integrate it with hundreds of airlines - each with different systems and requirements - whilst delivering a fantastic developer experience. We work with … working with Elixir (previous experience not required—we value strong engineering fundamentals over specific languages) ✅ You have a high bar for code quality and API design ✅ You have opinions on good engineering standards and processes as we define ours at Duffel ✅ You think big picture - making tradeoffs between ...