201 to 225 of 235 API Design Jobs in London

ship into customer environments from day one. You’ll work with Python/JS/Java/Apex, tackle LLM prompts, data modeling, and API design while collaborating with sales and customer architects. Travel ~25% to partner with customers. #J-18808-Ljbffr ...

Labs Ltd is seeking a foundational engineer to help build and scale ROO's platform. This role involves full-stack development, including feature shipping, API design, and integration of blockchain technology. Candidates should have over 4 years of experience with TypeScript, React/Next.js, and Node.js ...

Lupa Pets Ltd is hiring a software engineer to own features end-to-end across the full stack, from API design to React interfaces and database migrations. You will ship a real, user-facing product reaching vets and pet parents daily, collaborating with product and design ...

Wise Platform in London is seeking a Senior Backend Engineer to join our Partner Experience team. You will design and build backend microservices, focusing on partner onboarding, permissions, and cross-border payment tooling, with a strong emphasis on reliability and security. You’ll work across API design ...

Augur Communications Ltd is seeking a Backend Engineer to design and build the distributed systems, storage infrastructure, and platform primitives that underpin Augur's sensor integration product. You will work across the full backend surface—from stream processing and storage to API design and data pipelines—using ...

senior, hands-on engineers are needed to join a product development team working on an experimental, high-ambition product initiative. You will independently design, build and iterate on product features end to end, with a strong focus on backend services and AI-powered capabilities built on LLMs and agentic … TypeScript expertise on the backend (Node.js with NestJS, Express or Fastify) Proven delivery of production-grade applications from concept through to release Strong API design and system integration experience Ability to own features independently with minimal oversight Working knowledge of LLMs, agentic AI and AI-powered applications Familiarity ...

leader who delivers measurable results for sophisticated AI products under ambiguous conditions in a fast‐paced environment someone who is as comfortable discussing an API spec or an auth flow with an engineering team as they are presenting an AI strategy to senior management. You will thrives in collaborative … engineering workflows. Genuinely technical and a proven builder. Comfortable as a hands‐on partner with engineering and data science teams, able to reason through API design, system architecture, and technical trade‐offs, with credibility to lead build‐versus‐partner‐versus‐defer decisions. Proven experience identifying, validating, and prioritising ...

will have ownership and autonomy from Day One. There is no corporate ladder at Arondite. From your first day, you will directly influence the design, functionality, and direction of Arondite’s product offering. We hire the best people and give them extremely high levels of autonomy … synthesising their feedback Building a clear, explainable process for prioritising work in the face of B2G uncertainty Communicating to and working with Engineering and Design to build powerful, simple features that can be customised to deliver value to a wide set of users Championing a culture of technical excellence ...

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 ...

React/Node problems and reference implementations that model the technical bar. Owning technical direction: Leading architecture, boundaries, standards, build‐vs‐buy decisions, integration design and the call on when to take on technical debt and when to pay it down. Protecting release quality and operations: Owning release readiness … stay in the code, not step away from it. You’re technically strong: You’re confident in React, Node, modern web application development, architecture, API design, integration patterns and secure application design. You know how to raise the engineering bar: You’re an authoritative reviewer, able to review ...

lead Zero Trust initiatives, and document architecture decisions with a focus on secure, scalable design. You will mentor engineers, drive security policy and platform API design, and collaborate with IAM, Infosec and infrastructure teams to ensure auditable controls. #J-18808-Ljbffr ...

will own engineering for production-ready Python services, APIs and MCP integrations, collaborating with security and technology teams in London. Strong Python and API design skills are essential, with experience in fast-moving environments. You will work under the Associate Director, Applied AI, contributing to scalable architectures, testing ...

inference layers, implement multi-cloud orchestration, and ensure production-grade reliability. You’ll collaborate with senior engineers, write clean Go code, and contribute to API design, data models, and observability. You should be comfortable working across product features, deployment challenges, and customer interactions, with #J-18808-Ljbffr ...

leadership experience. The role involves delivering end-to-end solutions, collaborating with the application team, and influencing enterprise-level strategies. Strong C#/.NET, API design, and cloud experience are essential. #J-18808-Ljbffr ...

experiments. You’ll build backend systems that make our lab programmable and architect data pipelines for large-scale protein characterization. This role focuses on API design, instrument integration, and translating complex workflows into reliable software, with a strong emphasis on autonomy and pragmatic engineering. We value biology interest ...

party integrations. You will work closely with Product Owners, Frontend Developers, DevOps, and QA to ensure smooth, efficient, and secure platform operations. Key Responsibilities: Design and implement backend systems capable of handling thousands of concurrent player connections across multiple services. Develop scalable, modular microservices to support game logic, session … management, and operational services. API Development. Ensure low-latency data processing to support game engines. Collaborate with the product team to build new features, improve system performance, and support business requirements. Work with relational databases such as PostgreSQL and Oracle to ensure reliable and efficient data operations. Manage service ...

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 ...

opportunity to take ownership of technical solutions, work across the full delivery lifecycle and contribute to projects with real-world impact. Key Responsibilities Design, develop and maintain cloud-based applications and services using AWS. Configure and manage AWS infrastructure to deliver secure, scalable and reliable solutions. Apply infrastructure … languages. Work with AWS services to support compute, storage, networking, security and application integration. Contribute to the full software delivery lifecycle, from requirements and design through to deployment and ongoing support. Apply DevOps principles to automate deployments, improve reliability and streamline engineering workflows. Collaborate with technical colleagues and stakeholders ...

binary size, startup cost, thread safety, and backward compatibility are the job, not afterthoughts. You will own what you build end to end, from API design through release and live integration support. Based in-office (hybrid model) in London or Ljubljana, Slovenia. You Will Build and maintain … mobile SDK on Android (Kotlin) or iOS (Swift) Own the public API surface: minimal, stable across versions, and hard to misuse Keep the SDK lightweight and resilient, with no crashes in host apps and graceful degradation when the backend is unreachable Own releases, versioning, and distribution (Maven Central, SwiftPM ...

with customer requirements and business objectives. Daily Tasks To contribute to Agile Scrum, and ensure deadlines and production quality. To spearhead creative solutions for API and backend related challenges. To manage platform infrastructure for scalability, high availability, and security. To ensure product scalability, high availability, and top-notch code … alerting to maintain high availability. To build, operate, and secure the APIs, backend, and even cloud infrastructure. To incorporate security best practices into the API design and implementation. To evaluate product code against specifications and gathering requirements. To address problems and document all reported issues and actions taken. ...

will collaborate with London-based engineers and contribute to customer-facing workflows. A strong track record in Laravel and PHP is essential, along with API design and testing practices. #J-18808-Ljbffr ...

integration. You will build and operate enforcement services, authentication layers, and multi-tenant controls while collaborating with founders and early customers. Key contributions include API design, versioning, and secure customer interfaces, plus building real‐time data streams and a tamper-evident audit ledger. #J-18808-Ljbffr ...

product, so binary size, startup cost, thread safety, and backward compatibility are the job. You will own what you build end to end, from API design through release and live integration support. Based in-office (hybrid) in London or Ljubljana, Slovenia, you will work on Android (Kotlin ...

Apple's platforms. You will be responsible for bringing your ideas to life through all stages of their development: from initial research, to API design and proposals, to testing and development in Swift, to documentation and offering guidance to adopters. You'll join us in energetic discussions … team's work is at a critical part of the macOS stack and we are core contributors to new operating system features, such as design refreshes, new hardware, intelligence integration, and many others - we build what users expect from all apps on the platform. You'll also have ...

Trovix AI Ltd in London is seeking a product-focused engineer to own technical requirements and API design for AI deployments across SaaS and on-premise offerings. You will work closely with engineers, domain experts and regulated clients to ship features used by professionals at leading UK firms. ...