26 to 50 of 281 API Design Jobs in London

outside IR35. This is a hands-on role working on a mature Azure-based backend platform, with responsibility across the full software lifecycle - from design and development through to testing, deployment and production support. You’ll be working with C#, .NET, Azure Functions, Azure SQL, Azure Service Bus, Azure … API Management and Azure DevOps, contributing to a platform that supports connected patient services. This role is particularly suited to a developer who can hit the ground running, work independently and own technical delivery end-to-end without requiring day-to-day technical supervision. What You’ll Be Doing ...

great experience to delight our customers. Our goal is to enhance every traveler's experience and make it better!In this role, you will:Design, develop, and maintain high-throughput, low-latency distributed backend services that deliver efficient, optimal pricing solutions at scale.Implement robust caching mechanisms to enhance application … performance, reduce latency, and optimize resource utilization.Participate in system design, API design, and data modeling for scalable, reliable microservices.Contribute to technical documentation, detailed code reviews, and architecture discussions to ensure high-quality solutions.Analyze complex problems, break them down into manageable milestones, and collaborate with cross-functional teams ...

great experience to delight our customers. Our goal is to enhance every traveler's experience and make it better! In this role, you will: Design, develop, and maintain high-throughput, low-latency distributed backend services that deliver efficient, optimal pricing solutions at scale. Implement robust caching mechanisms to enhance … application performance, reduce latency, and optimize resource utilization. Participate in system design, API design, and data modeling for scalable, reliable microservices. Contribute to technical documentation, detailed code reviews, and architecture discussions to ensure high-quality solutions. Analyze complex problems, break them down into manageable milestones, and collaborate ...

grade infrastructure that allows clients to launch card programs anywhere in the world through a single integration.You will be responsible for a unified Global API and SDK suite that abstracts the complexity of regional payment networks. Whether a client is launching in Europe, North America, or APAC, your product … will provide a consistent, white-label experience. You will drive both the technical "how" (API/SDK design) and the strategic "where" (global expansion and regional issuing setups).What you’ll do:Unified Global API Strategy: Design and maintain a single, polymorphic API architecture that ...

part of influencing the strategic direction for connectivity with Neo4j and the drivers together with our product managers. You will be leading the design of new features and improvements to the protocol whilst taking on feedback from other experts and stakeholders within the company. You will then implement these … interest in: Network development (binary protocol specs like Bolt , Frontend/Backend , MongoDB Wire Protocol ) Network packet analysis (e.g., Wireshark) Distributed system design API design Netty Customer experience and developer community interaction Concurrency and asynchronous programming You may have also worked with some of: Database management systems ...

behind critical payment flows across EMEA.ResponsibilitiesDefine a multi-year vision for EMEA Payments that anticipates future merchant and ecosystem scale and complexityLead Engineering and Design through every phase of the product lifecycle, from 0-to-1 development to General AvailabilityEnforce rigorous standards for product quality, API design … related product roleA track record of shipping technical B2B2C products at a high velocityAn obsession with product quality in all its forms—from API design to dashboard UX and documentationExisting knowledge of the payments landscape or a demonstrated ability to learn complex domains quicklyStrong written and verbal communication ...

enjoys working across the whole stack and is equally comfortable building conventional services and AI‐enabled features. Key Responsibilities Build Across the Stack: Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces. Cloud Native Delivery: Develop and run cloud‐native … usable, performant ways for brokers and analysts. AI‐Enabled Development: Build AI‐enabled product features using patterns such as retrieval‐augmented generation, tool and API integration, evaluation and human‐in‐the‐loop design. AI‐Assisted Engineering: Use AI‐assisted engineering tools such as Claude Code or Claude Cowork ...

DescriptionRole Summary :We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands‐on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilities—spanning digital custody, tokenization enablement, digital transfer agency … will work closely with cross-functional teams to build robust, scalable, and secure digital asset products that meet our business and technical requirements.Role Description:Design, develop, and maintain Java backend services and REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate ...

work alongside architects, product stakeholders and delivery partners to ship software that brokers and analysts use every day.**Key Responsibilities:*** **Build Across the Stack:** Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces.* **Cloud Native Delivery:** Develop and run cloud … usable, performant ways for brokers and analysts.* **AI-Enabled Development:** Build AI-enabled product features using patterns such as retrieval-augmented generation, tool and API integration, evaluation and human-in-the-loop design.* **AI-Assisted Engineering:** Use AI-assisted engineering tools such as Claude Code or Claude Cowork ...

development lead and principal-level C#/.NET engineer within Risk, Product Control and ESG IT. The role combines hands‐on engineering with solution design, stream leadership, technical oversight and delivery accountability across a CTB portfolio. The role will support new product onboarding, feature delivery, methodology changes, platform enhancements … components. The consultant is expected to remain substantially hands‐on, contributing approximately 25%-50% as an individual contributor, with the balance focused on coordination, design governance, mentoring, dependency management and delivery execution. The technology stack is primarily C#/.NET, supported by MongoDB, SQL Server data warehouse components, enterprise ...

company is the world’s leading API platform, used by more than 45 million+ developers and 500,000 organizations, including 98% of the Fortune 500. the company is helping developers and professionals across the globe build the API-first world by simplifying each step of the API … Partners, and Nexus Venture Partners. Learn more at the company.com or connect with the company on X via ----- P.S: We highly recommend reading The "API-First World" graphic novel to understand the bigger picture and our vision at the company. Account Strategy Lead technical discovery sessions to uncover customer ...

Full Stack Engineer with a strong back‐end focus to join one of our Profile domain product teams. This role is full stack by design: you will work across back‐end and front‐end codebases, contributing to end‐to‐end product delivery. However, your primary strength will … front end. You will join an established, autonomous product team owning their product end‐to‐end, with real ownership over technical design, implementation, and continuous improvement. Your responsibilities Design, build and evolve scalable back-end services using C# and .NET Core, alongside developing front-end features with modern ...

operate globally, get in touch - we’d love to discuss how Ebury can accelerate your career so you can shape the future.Staff Product Manager - API ConnectivityProduct Ebury London Office - Hybrid: 4 days in the office, 1 day working from home per weekWe are looking for an experienced Product Manager … API Connectivity with ERP and accounting platforms. This role will lead the strategy, delivery, and evolution of integrations with systems such as Sage, QuickBooks, and ERP aggregators (e.g. Codat, Merge, Apideck).You will be responsible for building scalable, high-quality integrations that power financial workflows for our partners ...

after you’re helping with UI/UX, customer success, documentation and product ops. What You’ll Do Inference Platform Architecture & Core Services Design and build the company's inference service platform the backbone for serving AI models at scale across diverse workloads Own and architect core platform components … Gateway, Resource Orchestrator, Runtime Engines, and Autoscaler Design highly modular, scalable, and extensible low‐level designs (LLDs) for inference infrastructure components Lead high‐level design discussions, establish architectural patterns, and drive technical decision‐making for the inference stack Model Deployment & Lifecycle Management Understand and optimize the dynamics ...

experienced Senior Java/Python Engineer to join a high-performing Agile engineering team delivering secure, highly available and scalable microservices and API platforms. You will be hands-on with modern engineering technologies, working across microservices, APIs, Kafka, cloud databases, containers and observability, while also providing technical leadership … mentoring junior engineers. Key Responsibilities Design and develop scalable Java/Python microservices and REST APIs. Build and operate event-driven solutions using Apache Kafka . Design and optimise AWS Aurora PostgreSQL databases and data platforms. Deploy and support applications using Docker and Kubernetes . Develop API ...

engineering discipline, independent problem‐solving ability, and a commitment to building robust, scalable systems. You will work across modern cloud‐native architectures, contribute to API and microservices development, and help drive best practices across the engineering organisation. Key Responsibilities Design, develop, and maintain high‐quality Java applications using … Spring Boot. Build and optimise RESTful APIs and contribute to GraphQL service development. Develop cloud‐native solutions using AWS services such as Lambda, API Gateway, DynamoDB, ECS, S3, and others. Contribute to microservices architecture, event‐driven systems, and distributed design patterns. Implement CI/CD pipelines using tools ...

Role Summary :We are seeking a Java API Developer to join our Digital Asset development team. This is a hands-on software engineering role responsible for designing, developing, testing, and supporting RESTful APIs and backend services in a financial services environment. The role contributes to building reliable, secure … will work closely with cross-functional teams to build robust, scalable, and secure digital asset products that meet our business and technical requirements.Role Description :Design, develop, and maintain Java-based backend services and REST APIs that support financial services workflows and data use cases.Implement APIs in line with internal ...

full technology stack, from backend services and distributed data architecture through to responsive user interfaces, production support, and engineering best practice.Key ResponsibilitiesLead the design, development, and delivery of backend services and platform components using Java 8+/Spring Boot and Python/FastAPI. Build, enhance, and operate event-driven … real-time data pipelines using Kafka and related streaming technologies. Provide deep technical expertise in distributed systems, data architecture, and scalable platform design. Design, implement, and maintain Java-based APIs and microservices, including REST, OpenAPI, GraphQL, and gRPC services. Work with modern data technologies including PostgreSQL, MongoDB, and Amazon ...

will be a hands‐on technical leader who defines direction, raises engineering standards, and delivers measurable product outcomes, all while remaining deeply involved in design and development. This is not a traditional people‐management or delivery‐management role—here, you will write code, architect solutions, lead complex projects … role is perfect for leaders seeking high‐growth, product‐driven environments, who are passionate about distributed systems, and who want to directly influence the design of secure, scalable, and resilient infrastructure while cultivating top engineering talent. What You’ll Do: Architect and design scalable, resilient, high‐performance backend ...

DescriptionAbout usSolirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery.We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. By combining deep technical … expertise with people-centred design, we create solutions that deliver meaningful, lasting impact.Our consultants partner directly with client teams, embedding into organisations to understand their goals, challenges, and users. This collaborative approach enables us to deliver tailored solutions that drive measurable outcomes across public and private sectors.Past and present ...

Solirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery. We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. By combining deep technical … expertise with people-centred design, we create solutions that deliver meaningful, lasting impact. Our consultants partner directly with client teams, embedding into organisations to understand their goals, challenges, and users. This collaborative approach enables us to deliver tailored solutions that drive measurable outcomes across public and private sectors. Past ...

Solirius Reply, part of the, Reply Group is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery. We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. By combining deep technical … expertise with people-centred design, we create solutions that deliver meaningful, lasting impact. Our consultants partner directly with client teams, embedding into organisations to understand their goals, challenges, and users. This collaborative approach enables us to deliver tailored solutions that drive measurable outcomes across public and private sectors. Past ...

Defence delivery team. This is a versatile, high-impact role designed for funded client delivery: you will build mission-critical web applications and API backends for central MoD programmes, while contributing to low-level system integrations (Kotlin, Android ART, IPC/AIDL) on tactical edge and Situational Awareness … platforms. You will sit at the intersection of modern enterprise software engineering and tactical edge integration, ensuring all code meets MoD Secure by Design (SbD) principles and Def Stan 00-056 safety boundaries. Full-Stack Application Development: Design and build resilient, secure web applications, microservices, and APIs (TypeScript ...

Perkins, GV, and Evantic Capital, alongside the founders and operators of Stripe, Datadog, Miro, and Webflow.About the roleAs a Senior Software Engineer on our Design System team, you'll be a co-owner of the shared UI foundation that every Synthesia product is built on. You will be shaping … primary output is high-quality component code and the tooling around it.The defining challenge of this role is making that foundation AI-friendly: a design system that both people and AI can build with. As AI tools generate more of our UI, the system has to make it effortless ...

NVIDIA DGX SuperPODs to delivering real-time Language AI to over 300 million users and 200,000+ businesses globally.You will join the API Enterprise team. We sit at the intersection of DeepL's API platform and our Enterprise ecosystem. Whereas the Core team obsesses over the self-service … that enterprise IT and security teams depend on. We work hand-in-hand with a wide set of stakeholder teams to make DeepL's API the obvious and safe choice for global enterprises.We are shifting gears. We are moving from "Software-First" to "Product-First." We don't hire ...