26 to 50 of 275 API Design Jobs in London

them.Bring architectural coherence to decisions made within individual domainsIdentify technical risks and compounding complexity before they become incidentsSet standards for engineering quality — system design, observability, reliability, API design — that every team builds toBe the senior technical voice in cross-team planning, roadmap discussions, and major build vs. … intensive, fast-moving engineering org — and has the range to show for itCan credibly walk into a conversation about data pipeline architecture, RAG evaluation, API design, or system scalability — and add something useful in all of themOwns problems, not just opinions. You're not here to review ...

Come join the Risk Intelligence Content Curation and Distribution team as an Application Architect, and help drive application design, as we support our World-Check customers in protecting against sanctions evasion, money laundering, human trafficking, terrorisim and more!Role summary:The Application Architect plays a key technical role within … this role contributes to their the architecture and technical direction on the Risk Content Curation and Distribution PlatformThis role focuses on application‐level architecture, design quality, and technical guidance, working closely with Solution Architects, Product Owners, and engineering teams. You will help translate business and non‐functional requirements into ...

Build and maintain user interfaces for client-facing features, ensuring high-quality and performant UI delivery Collaborate with backend engineers and product managers to design, develop, and deliver new features while providing technical input on API design and data handling Implement and enhance AI-driven capabilities that … with complex workflows Develop advanced data visualizations, including charts, maps, and dashboards, that provide real-time interactive insights Contribute to and maintain the internal design system, including custom caching mechanisms and advanced state management solutions Balance new feature delivery with ongoing maintenance and performance optimization Identify and resolve issues ...

solid engineer with 2-4 years of experience building backend systems and platform infrastructure. You write clean, well-abstracted code with proper design patterns and comprehensive test coverage. You’re comfortable working on both the Compute Platform (multi-cloud orchestration, resource management) and Inference Platform (model serving, autoscaling) under … leads Implement features for multi‐cloud orchestration, resource scheduling, model deployment pipelines, and autoscaling systems Write well‐maintained, production‐grade code with proper abstractions, design patterns, and comprehensive test coverage Contribute to low‐level design (LLD) including service APIs, database schema design, data models, and component interactions ...

Limited is seeking a senior .NET Architect to lead the architecture of .NET-based applications, including .NET Core/ASP.NET MVC, C#, and Web API 2. You will define the overall structure, components, and interactions to support scalable, reliable systems. This role involves API design, data exchange ...

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 ...

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 ...

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. The Opportunity the company is the world’s leading ...

experience (Solace or similar like Kafka/RabbitMQ) Backend focus with UI-awareness for BFF interaction Must Have C# Real time data/streaming API design experience Server side development experience (threading, memory management, performance) Desirable K8S AI/LLM experience (e.g. Claude, Codex, Agents and Agentic flow … Multitude of functions to support UI interaction for pricing Pricing blotter support Adapt messages to proprietary Pricing Engine format sent and received over Solace API design to be flexible – reuse where possible for curve construction for Rates, FX, and other problem domains About Barclays Barclays is a British ...

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 ...

code reviews, pair programming, and architecture discussions; Collaborate cross-functionally with other Apple teams to integrate tools and systems seamlessly; Write detailed architecture and design proposals; Identify areas for continuous improvement; Mentor other engineers; Contribute to architecture discussions, code reviews, and proposals. Требования Experience shipping high-quality, performant … reliable web applications; Passion for developing products and features; Ability to discuss technical trade-offs across system architecture, database design, API design, and infrastructure; Continuous learning attitude focused on improving personal and team capabilities; Nice to have: BS/MS in Computer Science, Computer Engineering, Informatics ...

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 ...

when: technical approach, task breakdown, sequencing, capacity, and the quality bar, and be accountable for delivery; Hold the line on backend design discipline, so that services stay maintainable as the team and codebase grow; Collaborate with Product, Design, and QA to define, design, and ship features, distinguishing … Tech Lead or in a similar technical-Leadership role, owning a team's technical approach and delivery; Strong backend fundamentals: Clean Architecture, design patterns, and API design, with hands-on experience in C#/.NETor Node/TypeScript; Proven experience building single-page web apps with React ...

value as well as achieving our carbon net-zero goals.As an engineer on this project, you will collaborate with Product Managers and partners to design, develop and maintain enterprise scale software systems and tools.As part of a global team working on a global product, you will lead … distributed production systems.Passionate about mentoring and coaching engineers across both technical and soft skills.Product-centric mentality with the ability to understand business needs and design scalable, resilient systems and solutions.Strong empathy and curiosity to create exceptional user experiences.Self-starter with excellent communication skills, adept at handling ambiguity, navigating uncertainty ...

BDSthe company helps organisations deliver meaningful digital transformation through cloud, data, AI and cyber security. We work across the public and private sector to design and build technology solutions that make a genuine difference to users. We’re looking for an Azure Application Developer with strong API development … production ready solutions within Microsoft Azure. The RoleAs an Senior Developer at UBDS, you’ll work alongside developers, architects, DevOps and security engineers to design and build cloud native applications and APIs. This is a hands on role where you’ll take solutions from requirements and design through ...

enterprise and partner ecosystems. The position also plays a key role in shaping industry best practices and representing the organisation externally. Enterprise & Ecosystem Architecture Design and oversee the implementation of enterprise‐wide software architecture, spanning internal platforms, cloud environments, and external partner ecosystems Develop “big picture” architectural frameworks … adherence to security, compliance, regulatory, and quality standards Identify and mitigate long‐term architectural risks (e.g., vendor lock‐in, scalability constraints, regulatory exposure) Technical Design & Solution Development Conduct research, analyse data, gather requirements, and define end‐to‐end solutions Create architectural artefacts representing system functions, integrations, and user interfaces ...

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 ...

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 ...

major advantage. Key Responsibilities Technical Leadership Own the technical roadmap, guide architectural decisions, and ensure engineering excellence across backend services. Python Engineering Design and build robust, secure, and scalable microservices using Python (FastAPI, Django, Flask). System Architecture Lead the design of distributed systems, event-driven architectures … data intelligence. DevOps & Cloud Collaborate on CI/CD pipelines, containerisation (Docker, Kubernetes), and cloud deployments (AWS/GCP/Azure). Data & API Strategy Oversee API design, data modelling, and integration with internal and external financial systems. Security & Compliance Ensure systems meet regulatory, security, and audit ...

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 ...

This Role We're hiring a senior full-stack engineer who owns real problems end-to-end and shapes how the team builds, from API design and frontend experience through to backend services, production reliability, and launch. You already use AI as part of how you think, build … test, and ship. You'll write code that moves money in production, design and modernize the platform across the stack, and lead delivery of customer-facing features as Xe rebuilds its platform layer. You'll work in a small engineering team with direct access to product, design ...

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 ...