26 to 50 of 53 API Design Jobs in London

creates real customer value, prototype the hardest bets yourself, and bring the team with you. Own delivery end-to-end. Pick up a problem, design the solution, ship the work wherever the feature lives, and see it through to production. Own on-call. Be on the rotation, and stand … just code. You measure your work by what changed for the customer, not the lines of code shipped. Production minded. Solid grasp of API design, observability, scaling, reliability, and security. Care about craft. Clean APIs, attention to detail, and how the system feels to work in. Comfortable ...

works with top tier global financial institutions and major tech companies to offer our client products and services directly to their customers. Through our API, we help partners to architect and build integrations to our world class-leading international finance products, which in turn improves our client by increasing … turnaround times. Designing and developing innovative new features that expand the functionality of our client's services and exposing these features through the public API, enabling seamless integration with partner systems and empowering them to leverage the full potential of our client's platform. Diagnosing and resolving complex technical ...

including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices. Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings ...

including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices. Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings ...

high-impact engineering role combining hands-on full-stack development, scalable architecture and direct collaboration with front-office stakeholders. What you'll be doing Design and build modern applications using React or Vue.js and Java-based back-end services. Develop distributed microservices, APIs and scalable enterprise architectures, with Python … solutions using AWS, Azure or GCP, alongside CI/CD pipelines and automated testing. Optimise application performance, security, reliability and production support. Lead technical design, code reviews and testing, resolve complex engineering challenges and mentor other developers. Work directly with portfolio managers, product owners and cross-functional teams ...

security etc). Working within a project management/agile delivery methodology Experience in technical ownership for a product or software solution, covering design, estimation, shaping and user story/requirement creation Documentation of solutions (e.g. architecture, configuration, release, support-handover Collaborate and liaise with other our client … including microservices and message-driven architectures NFR/Non-Functional requirement understanding and experience developing applications with this in mind Application/Digital Services Design experience Experience in software engineering practices like Code Reviews, CI/CD Pipelines and SOLID/DRY principals Hands-on developing/coding role ...

Selective To Be Effective. Be Highly Aligned, Loosely Coupled. Disagree Transparently. Encourage Independent Decision-Making. Build Dream Teams. Who You Are: You'll design and build backend systems powering blockchain infrastructure and staking products across Galaxy — spanning Ethereum-based systems, staking infrastructure (native and liquid), and blockchain data systems … first development environment that increasingly leverages AI-assisted workflows. Typical time allocation: roughly 60% building systems and features, 20% code review and mentorship, 20% design, architecture, and product collaboration. What You'll Do: Build and own backend systemsDesign and build APIs, services, Ethereum data pipelines and indexers, staking ...

applications, platforms and deployment processes. This is not a traditional vulnerability management role, it is a hands-on Application Security role centred on secure design, CI/CD security, cloud-native technologies, Kubernetes, API security, code analysis, security-as-code and supporting development teams to build secure applications. … controls throughout CI/CD pipelines. Strengthening the security of GitHub Actions and comparable continuous integration and deployment platforms. Providing technical guidance on secure API design and protecting externally accessible systems. Supporting the security of Azure cloud infrastructure, including Azure Kubernetes Service (AKS).Assisting with the protection ...

within a multidisciplinary or agile delivery team, including coaching, mentoring, pairing, coordinating technical work and helping teams apply good engineering practices consistently. Ability to design, review and deliver systems with medium to high levels of technical or business complexity, ensuring appropriate technology choices, secure design, maintainability, performance, integration … adherence to modern standards Automated testing, CI/CD, reusable components, observability, secure development, API design, systems integration and continuous improvement of developer experience. The role is likely to suit someone who can operate confidently as the bridge between strategic technical direction and practical delivery within a squad. ...

teams to integrate security throughout the software development lifecycle. Microsoft Azure and KQL experience are essential , alongside relevant experience in CI/CD, Kubernetes, API security, security-as-code and security automation . This is a hands-on application security role focused on secure design, application security testing … Integrating security controls into CI/CD pipelines. Strengthening the security of GitHub Actions and similar CI/CD platforms. Providing guidance on secure API design and externally accessible systems. Supporting Azure cloud infrastructure, including Azure Kubernetes Service (AKS). Developing security-as-code and policy-as-code. ...

Processing, and Cash & FX. You'll act as the technical authority within delivery teams, driving architecture strategy, governance, and engineering best practice. Key Responsibilities Design modern microservices and event-driven architectures using technologies such as Kafka, REST APIs and cloud platforms. Lead architecture governance, technical reviews, non-functional requirements … Processing Strong software engineering background in Java, Spring Boot, Oracle and SQL databases. Proven experience with: Microservices architecture Event-driven systems (Kafka, MQ, Solace) API design and integration AWS and/or Snowflake Knowledge of SWIFT MT, ISO 20022 and post-trade processing workflows. Experience operating within enterprise ...

including APIs, workflow engines, data services, and system integrations. Develop and support integrations between Java/Spring platform components and Python-based AI services. Design secure, reliable, and high-performance systems. Collaborate with cross-functional engineering teams to deliver robust backend solutions for demanding production environments. Implement and enhance … API architectures, observability frameworks, automated testing, and security best practices. Contribute to cloud infrastructure, CI/CD pipelines, and operational excellence across AWS-based environments. YOUR SKILLS AND EXPERIENCE : Strong commercial experience building backend applications. Strong Python experience is essential, with FastAPI as highly desirable Strong SQL and PostgreSQL ...

work: We're a small team that ships frequently and iterates on real partner feedback. Engineers own features from technical discovery and design through to production support. We work closely with our PM and designer to understand partner needs, and with adjacent teams (API Experience, Account Discovery … identity mapping between partner systems and Wise. The communication layer services between Wise and partners, extending them to handle new case types and workflows. API design for partner-facing endpoints. We care about consistency, documentation, and making them usable without hand-holding. Work with FinCrime, Compliance ...

part of a small, highly experienced engineering team responsible for transforming ambitious ideas into production-ready software. Working closely with Product, Design and AI specialists, you'll take concepts from whiteboard sketches through to prototypes, proof of concepts, MVPs and ultimately scalable products. If you enjoy solving complex problems … frontend development, backend engineering and cloud technologies to rapidly build and validate new AI-powered products. You'll be heavily involved in architecture, technical design and proof-of-concept development, collaborating directly with stakeholders to transform ideas into working software. This is a hands-on engineering role where ...

safe to ship.QualificationsWhat we're looking forAround eight years or more building and running production software, with real depth in Python/Django REST API design, data modelling and service reliability.You have set technical direction for a team: chosen the approach, written it down, defended it, and changed … when you were wrong.Strong on performance, cost and observability. You have owned the pager as well as the design doc.Genuinely fullstack and user-minded — comfortable in React, you think about how a change feels to the person using it, and you raise the bar on frontend work even ...

with strategic leadership capabilities to deliver robust, scalable data solutions that support our organization's analytical and operational requirements.Responsibilities:Lead the end-to-end design, development, and maintenance of our enterprise-grade Data Lake platform, with particular emphasis on optimizing data ingestion workflows and acquisition methodologiesCollaborate closely across various … health and lineageEstablish and maintain documentation standards, best practices, and governance frameworks for data acquisition and quality assurance processesLead architectural discussions and to technical design decisionsSkills, experience, qualifications and knowledge required:Experience: Experienced Java Software Engineer with extensive professional development experience and a proven track record of delivering enterprise ...

What you’ll bring 3–7 years’ experience in ML Ops, ML platform or infrastructure engineering, or backend engineering. Strong production Python skills, including API design, testing and maintainable services. Experience deploying and operating ML models in production. Familiarity with the ML lifecycle, from training and validation through … Experience with CI/CD and workflow orchestration. Comfort working with cloud infrastructure, containers and infrastructure as code. A sound understanding of observability, system design and common failure modes in ML systems. The ability to weigh reliability and operational trade-offs, and communicate clearly across teams. Nice to have ...

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 £85,000 Scala, REST Api, NoSQL, TDD/BDD, functional programming, CI/CD, Play, Akka ...

products (e.g., Concierge an agentic AI workflow tool, Prism a Mercer knowledge fabric for scheme data, and similar initiatives), from problem framing and design through build, release, and support. Translate risk advisory/consulting needs into clear technical requirements, user stories, and solution designs; partner with stakeholders through … Proven experience as a Tech Lead/Lead Engineer delivering production software, including hands-on coding and code review ownership. Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role-based applications. Experience working directly with business stakeholders in a financial firm, with ...

DescriptionAs our AI practice scales, we are seeking an experienced AI Architect/Engineer to act as the senior technical authority shaping how we design and deliver next-generation AI solutions. This is a role for someone who has moved beyond building individual models to architecting entire systems: agentic … ambiguous business problems into robust, deployable architectures. As engagements mature, you will provide the technical oversight that keeps delivery teams aligned to the original design intent. Your influence will be felt in pre-sales conversations, solution blueprints, and the technical standards that define how our practice builds. This ...

core business systems. This is a hands-on development role working closely with other Developers, Business Analysts, Testers and Product Owners to design, build and support high-quality, maintainable software. In particular: Designing and developing robust Modern .Net (C#) and Angular solutions that support critical business processes Building well … knowing how to manage those risks. SKILLS REQUIRED You will be comfortable working in a collaborative development team, understanding business requirements, contributing to technical design decisions and delivering well-structured code that is reliable, maintainable and easy to support. You will be able to demonstrate: Strong commercial experience with ...

with substantial hands-on responsibility rather than purely architectural oversight. Strong backend and database skills . Production experience with TypeScript/JavaScript and Node.js , API design, asynchronous programming, SQL and relational data modelling. Evidence of performance improvement. Practical experience profiling applications, diagnosing bottlenecks and reducing ...

with substantial hands-on responsibility rather than purely architectural oversight. Strong backend and database skills . Production experience with TypeScript/JavaScript and Node.js , API design, asynchronous programming, SQL and relational data modelling. Evidence of performance improvement. Practical experience profiling applications, diagnosing bottlenecks and reducing ...

partners across product, legal, policy, and design. What We're Looking For 8+ years of professional iOS development experience with modern Swift and Cocoa design patterns. Agentic workflow adoption: Hands-on experience integrating tools like Cursor and Claude into daily engineering. Platform & API design: Proven track record ...

Cloud Engineer to join a specialist engineering team delivering secure, mission-critical technology for UK National Security customers. The role offers the chance to design, develop, deploy and maintain cloud-native applications and services on Amazon Web Services (AWS), supporting systems that contribute to the UK's national security … takes ownership of the full software delivery lifecycle and wants to apply their technical skills to work with a meaningful national impact. Key Responsibilities Design, develop, deploy and maintain cloud-based applications and services using AWS. Build secure, scalable and resilient cloud solutions that support critical National Security customer ...