26 to 50 of 60 API Design Jobs in London

Position: Java Tech Lead Location: London, UK (Hybrid 2 days onsite a week) Duration: Full Time Job Description: Key Responsibilities Design, develop, and maintain robust, scalable, and high-performance web applications. Build responsive and dynamic user interfaces using React.js. Develop Back End services and APIs using Java (Spring Boot … Mandatory hands-on experience with React.js, Redux (or similar state management libraries). Solid understanding of HTML5, CSS3, JavaScript (ES6+). Experience with RESTful API design and integration. Familiarity with databases such as MySQL, PostgreSQL, or MongoDB. Experience with version control systems like Git. Strong understanding of object ...

full-stack architecture—understanding patterns, quality standards, and modern best practices for both client and server-side development. Collaborate cross-functionally with Product Management, Design, QA, and Customer Success to understand requirements and deliver features in iterative cycles. Contribute to designing and implementing products that are easily monitored, maintained … backend, integrating quality into every build. Participate in discovery and experimentation, using insights from Product and Customer Success to understand customer needs. Contribute to API design, database schema development, and server-side logic implementation. What You Bring 5+ years building modern web applications with Angular for the frontend. ...

GlobalLogic, a Hitachi Group Company and a leader in digital engineering. We help brands across the globe design and build innovative products, platforms, and digital experiences for the modern world. By integrating experience design, complex engineering, and data expertise - we help our clients imagine what’s possible … working. Initially 6-9 months About the role: Experience with C#/.NET Additional languages highly desirable ie Java, Python React/TypeScript RESTful API design Apache Kafka PostgreSQL Git/GitHub workflows Experience with Kubernetes deployments; able to build CI/CD pipelines About you (ideally ...

people actually love to use? We are representing a globally recognized digital product studio that sits at the sweet spot of high-end aesthetic design and hardcore engineering. They're looking for a Senior & Lead Full-stack Engineer to join the growing function. This isn't a "ticket-taking … robust, scalable backend. What You Bring to the Table React Node/TypeScript/JavaScript Cloud: AWS, Azure, or GCP. APIs: API design and integration (REST & GraphQL). AI Tooling: Confident using AI-boosted environments to ensure quality (Claude or similar). The Cherry ...

execution. Requirements: Proven experience managing engineering teams in a product-focused environment (startups or scale-ups preferred). Leading cross-functional teams (Product, Design, Engineering, Operations). Full-stack technical proficiency: able to review, unblock, and guide frontend and backend development. Strong software engineering fundamentals, including API design ...

Stack) | Financial Services Location : London (Hybdrid) Salary : Up to £130,000 + Equity + Private Health Python | Full Stack (React/Typescript | Distributed Systems | API Architecture | Cloud | Microservices I’m currently looking for: Lead Software Engineer (Python, APIs, React, Typescript) Our client builds high-scale, high-performance platforms used … define technical vision, lead critical backend projects, and act as a trusted engineering voice in product and platform discussions - shaping everything from API design and system architecture to performance, resilience, and scalability. What You’ll Bring 🔥 Expert-level Python & Front End engineering skills - clean, scalable, production-grade code ...

spend; Brands using our platform to drive customer acquisition and retention through targeted incentives; and Strategic Partners (fintechs and banks) who integrate Verve's API to power or enhance their own loyalty propositions. We closed 2025 with strong growth across our core KPIs and have a significant partnership with … Strong collaboration and support of product, data, operational and commercial teams. Further details on responsibilities: Own and evolve the end-to-end technical design of our cashback rewards SaaS platform, defining architecture across microservices, data pipelines, and event-driven components Lead design reviews, code quality initiatives, and engineering ...

Align data architecture with security, compliance, and data governance requirements Lead the evolution of technical architecture documentation, models, and decision records Conduct architecture and design reviews with cross-functional teams Guide teams in the adoption of best practices in API design, modularity, cloud-native patterns, and event … driven systems Recommend data management best practices, covering data flows, architecture patterns, retention, archival, and purging strategies Coach and mentor engineers on data design, refactoring, and architectural reasoning Essential skills and experience: Proven experience designing and scaling enterprise-grade cloud data platforms (AWS preferred) Deep experience with AWS, Databricks ...

data synchronisation strategies. * Ensure front-end performance is optimised through techniques such as code splitting, virtualisation, bundle optimisation, and rendering efficiency improvements. * Collaborate on API design through a Backend-for-Frontend (BFF) approach, ensuring clean, predictable data contracts. * Embed security-by-design principles into all front … delivering complex, enterprise-grade front-end applications from build through to production. * Strong understanding of front-end architecture, including scalable project structure, reusable component design, and maintainable code patterns. * Advanced TypeScript skills, including typing API responses, shared models, and robust component interfaces. * Experience working with modern state management ...

agility with the backing of a well-established business. The Senior Back End Developer will... take ownership of backend engineering for a new API-first data intelligence platform. Role Highlights Design and build scalable backend systems from a true greenfield starting point Define architecture, balancing rapid delivery with … long-term scalability Develop API-first services for data-heavy, enterprise-grade applications Embed observability, metrics, and performance tracking from day one Collaborate within a small, high-autonomy team shaping a new product You Will Need Extensive backend development experience within data-driven B2B environments Strong programming skills ...

create the world’s leading, commercially scalable, safe, and advanced humanoid robots that seamlessly integrate into daily life and amplify human capacity. Responsibilities Design and implement a centralized cloud-based platform for managing a fleet of humanoid robots, monitoring system health, and visualizing fleet-level KPIs Develop robust backend … Expertise Proficiency in one of Python, Javascript, Golang or Rust Familiarity with React (or similar frameworks) for creating user-friendly web applications. Expertise in API design, data modeling, and distributed architectures Proficiency with CI/CD pipelines, containerization (e.g., Docker, Kubernetes), and workflow automation. Proficiency in infrastructure ...

deployment, Azure Service Bus, Blob Storage SQL Server T-SQL, EF Core migrations, query optimisation Azure DevOps Repos, Boards, Pipelines, Test Plans REST API design and OpenAPI/Swagger documentation This is an exciting time to be joining our client with salary will be based on experience ...

technical initiatives across multiple teams Experience designing scalable, high-performance systems Experience working with legacy or monolithic systems and modernising them Strong understanding of API design and distributed systems Knowledge of modern engineering practices, including CI/CD and DevSecOps Understanding of secure development practices such as OWASP ...

This role is designed for engineers who have built and operated large-scale systems end-to-end, not those with superficial exposure or purely design-focused experience. Candidates must have strong experience of Java Full Stack, React, Kubernetes & Docker. Experience in building responsive, component based user interfaces using modern … front end frameworks. Hands on expertise in API design and development (REST/JSON), including versioning and backward compatibility. Experience with UI testing, component testing, and front end build tooling. Experience in CI/CD pipelines, GitOps workflows, A/B testing strategies and also automating the workflows ...

Java development skills Proven experience building resilient high availability and high-performance applications Deep understanding of microservices architecture and distributed systems Strong expertise in API design and implementation Extensive experience with container orchestration platforms Kubernetes In-depth knowledge of messaging systems Apache Kafka RabbitMQ Proficient with MongoDB ...

Trading (Oil, Gas, or Power). Technology Stack : Deep Mastery: Gresham Asset Control (legacy) and Prime EDM. Architecture : Cloud-native migrations (AWS/Azure), API design, and SQL/NoSQL performance tuning. Scripting : Python (preferred) or Java for custom business logic and automation. Pricing Logic : Strong understanding ...

Great Fit If You: Have 4+ years’ experience building production-grade web apps with React + TypeScript Are comfortable across the stack - API design through to front-end polish Have experience with AWS or similar cloud infrastructure Care about ownership, quality, and impact Are curious about AI, automation ...

architecture Extensive experience with PostgreSQL, including performance tuning and complex queries. Experience with background job processing using Sidekiq and Redis. Solid understanding of RESTful API design, JSON serialization, and authentication (e.g., JWT, SSO). Hands-on experience with AWS services and containerised deployments (Docker). Experience troubleshooting ...

owning the cloud-native platform that underpins conversational AI and generative AI products at scale. Sitting at the core of AI delivery, you will design, build, and operate the runtime, infrastructure, and operational layers supporting RAG pipelines, LLM orchestration, vector search, and evaluation workflows across AWS and Databricks. Working … platform powering conversational assistants and generative AI products. Build, operate, and optimise RAG and LLM-backed services, improving latency, reliability, and cost. Design and run cloud-native AI services across AWS and Databricks, including ingestion and embedding pipelines. Scale and operate vector search infrastructure (Weaviate, OpenSearch, Algolia, AWS Bedrock ...

full-stack product delivery, from infrastructure and AI integrations through to React/React Native interfaces, collaborating closely with founders, creators, product, and design to turn lean specs into scalable, user-loved software. We’re looking for a strong generalist with backend depth and real mobile experience. Responsibilities Implement … mobile + web frontend → APIs → data models → integrations) while maintaining quality and velocity. Build React Native mobile apps and shared component systems across products. Design and ship scalable backend services (APIs, integrations, AI workflows). Run tight build → test → iterate → ship loops; provide realistic estimates and surface blockers early. ...

engineering hires, you will play a key role in building and scaling the core platform , working closely with the CTO and senior engineers to design, develop and deploy new features. This is a hands-on role with real ownership and impact on product direction. Requirements 2+ years of commercial … production web applications (not just data science scripts) Experience with Docker and containerised applications Experience working with relational databases (e.g. PostgreSQL) Good understanding of API design and backend architecture Proficiency with Git Willingness to work 2 days per week onsite in London Nice to have Exposure ...

following key skills: - At least three years commercial scala programming - Strong framework experience (Akka, Play etc) - Relational database experience - PostgreSQL - MongoDB, NoSQL - RESTful API design and integration experience - Solid unit test understanding - Spec2, scalaTest etc - Experience working in a TDD/BDD driven environment - Containerization experience - Docker, Kubernetes … well-established friendly team then please apply now to be considered and for further details. Scala Developer Up to £80,000 Scala, REST Api, NoSQL, TDD/BDD, functional programming, CI/CD, Play, Akka JBRP1_UKTJ ...

direction. Clear communication skills are a must, as well as an ability to operate in ambiguity. Non-Negotiables Python FastAPI – or adjacent Python frameworks API design and backend architecture fundamentals PostgreSQL and/or MongoDB experience Strong React or React Native experience AWS serverless infrastructure and Docker experience ...

senior individual-contributor role within a high-performing engineering team, building asynchronous, message-driven systems designed for scale, resilience, and near-zero downtime. Design and implement high-throughput, low-latency systems processing millions of real-time payment events Build event-driven architectures using modern Java and reactive frameworks Work … extensively with non-blocking I/O, asynchronous flows, back-pressure, and concurrency Contribute to system and API design, focusing on scalability, fault tolerance, and observability Collaborate closely with architects, engineers, and client teams across Europe Operate in Agile environments (Scrum/Kanban) with a strong engineering culture ...

evolution of core Ruby on Rails operational platforms. Optimise PostgreSQL performance and Sidekiq background job efficiency. Manage secure third-party integrations and RESTful API design. Partner with Platform teams on AWS and CI/CD reliability. The Person: Deep experience with Ruby on Rails and OOP. Expert in PostgreSQL ...