1 to 25 of 44 API Design Jobs in London

pressure; make frame-time and latency predictable across device classes Define and monitor SDK health metrics at scale (crashes, ANRs, error rates, perf envelopes) API design and developer experience Design clear, stable, Kotlin-first public APIs (versioned, well-documented, testable) Implement best practices for networking, auth … fixes and verify via dashboards Provide concise developer-facing change notes/migration snippets to the Solutions Engineer for release notes Roadmap contribution Co-design the next generation of the Android Captur SDK for release at the end of Q2 Champion performance budgets and device-class targets during planning ...

complete picture of candidate requirements. Overview: We are seeking a technically proficient Data Analyst to join our IT Department. This role will focus on API design and systems integrations, playing a vital part in enabling data-driven decision-making and ensuring seamless data exchange across internal and external … platforms. Key Responsibilities: Design, document, and maintain APIs to facilitate secure and efficient data integration between systems. Analyse and interpret complex datasets to support IT operations and strategic initiatives. Create and maintain data dictionaries, business glossaries, and detailed documentation of data structures and relationships. Define and document data lineage ...

Role We’re hiring a Backend Engineer to build the core infrastructure behind Revax’s AI-native platform for professional services. You’ll design, optimise, and scale the systems that power multi-agent drafting, knowledge graphs, and auditable AI workflows used by accountants, tax advisors, and consultants at leading … graphs, and real-world enterprise workflows. What You’ll Do Build & own core backend systems · Build and optimise databases for complex, real-world data · Design and implement APIs using FastAPI for AI workflows and product features · Build and scale LangGraph-based multi-agent systems with checkpointing, retries, and observability ...

title: Product Manager/Senior Product Manager Focus: Platform (API-first architecture, integrations, developer experience, data infrastructure, and cross-domain enablement) Location: London/Hybrid (in office minimum 3 days a week) Term: Permanent/Full-time Reports to : CPO (Chief Product Officer) About us B4B Payments is part … developer experience that all domain areas build on (e.g. Cards, Payments, CX). Your mission is to make the platform scalable, well-documented, and API-first – enabling evolution of a modern, composable financial services platform that clients and partners can integrate into their existing workflows and systems. You will ...

supporting GST. What you'll do Work as a full-stack software engineer, coding, developing, and testing applications using Golang and Python, across service, API, and automation layers Lead the strategic development and implementation of the AI Operations platform, driving AI-enabled software solutions for alert ingestion, correlation, automation … operational workflows Design, build, and operate software and automated testing frameworks on AWS, including unit tests, integration tests, API tests, and environment-based validation Document and maintain every aspect of applications and software, including design specifications, configuration, deployment processes, and troubleshooting runbooks Train, mentor, and oversee development ...

Ireland providing specialist services to a wide range of blue-chip clients. The role We are seeking technical polyglots who enjoy both technical architectural design, hands-on coding and peer reviews, though also like the idea of the equally important social/client-facing aspect of the role. … development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority (TDA) for delivery of technical stories and produce technical documentation artefacts to support the delivery process. Main Responsibilities Duties will include: The design ...

Required Technology: 15+ years of progressive software engineering; 5+ years leading AI‐native solutions at enterprise scale. Hands‐on with LLMs and agentic frameworks; design and deploy AI systems that augment SDLC (requirements → coding → testing → ops). Tooling & Platforms (practitioner proficiency): Claude Code (Anthropic) for secure, context‐rich code …/Gemini for research workflows where permitted; govern enterprise knowledge ingestion. Architecture & Integration: Distributed systems, microservices, cloud‐native (Azure/AWS/GCP); secure API design (REST/GraphQL). MLOps & AIOps: CI/CD for AI, model lifecycle (eval, versioning, rollout/rollback), guardrails, telemetry, drift monitoring ...

create solutions that are both technically robust and aligned with business ambition. You will help us modernise our trading platform by applying contemporary design patterns, cloud-native engineering principles, and architectural thinking that supports performance, scalability, and future growth. Throughout the delivery lifecycle, you will provide guidance, ensure alignment … front-, middle-, and back-office workflows, ensuring that every componentfrom deal capture to optimisation and reportingworks seamlessly together. Key areas of focus include: Architecture & Design You will lead architectural direction for our trading systems, documenting key decisions, making thoughtful trade-offs, and ensuring that every design reflects both ...

create solutions that are both technically robust and aligned with business ambition. You will help us modernise our trading platform by applying contemporary design patterns, cloud-native engineering principles, and architectural thinking that supports performance, scalability, and future growth. Throughout the delivery lifecycle, you will provide guidance, ensure alignment … front-, middle-, and back-office workflows, ensuring that every componentfrom deal capture to optimisation and reportingworks seamlessly together. Key areas of focus include: Architecture & Design You will lead architectural direction for our trading systems, documenting key decisions, making thoughtful trade-offs, and ensuring that every design reflects both ...

alignment between technical and business leaders, balancing strategic direction with delivery needs. Represent architecture in governance forums, supporting prioritization, risk discussions, and assurance reviews. Design, Analysis & Governance Create high-quality architectural artefacts including diagrams, data flows, integrations, future-state designs, and migration pathways. Evaluate technology options and assess impacts … digital or enterprise environments. Strong software engineering foundation, with practical knowledge of modern application architectures (e.g., microservices, APIs, distributed systems). Proven ability to design and document architectures using visual modelling techniques such as C4, UML, and data flow diagrams. Hands-on experience with at least one major cloud ...

Onsera's core product platforms, from wearables integration and health data pipelines to member payments and AI workflows. As a player-coach, you'll design and implement full-stack solutions while setting engineering standards and help build and mentor our engineering team as we scale. This role offers … opportunity to shape API-first architectures, lead complex integrations with healthcare partners and SaaS platforms, and transition into engineering leadership as the organization scales. What You'll Do Own technical delivery of multiple Onsera products from design through production and iteration Design and implement full-stack solutions ...

core stack includes: The Engine: Expert-level C# and .NET Core mastery. Architecture: Deep understanding of SOA (Service Oriented Architecture) and complex Object-Oriented design patterns. System Dynamics: Specialized knowledge of concurrency, asynchrony, and parallelism —essential for real-time transactional processing. Data & Web: High proficiency in SQL Server … API design, and modern front-end fundamentals (HTML/CSS/JS). Reliability: A strict practitioner of TDD (Test Driven Development) and robust CI/CD processes. Desired Innovations Our client is actively modernizing. Exposure to the following is highly valued: Cloud & Orchestration: Azure ecosystems, Docker ...

seeking an experienced Senior/Lead .NET Backend Developer to join our mobile applications development team. This role will provide technical leadership in the design, development, and optimisation of backend services and APIs that support modern mobile and enterprise applications. Working within a high-performing engineering environment … position will also involve mentoring and supporting two.NET engineers, helping elevate engineering standards and best practices across the team. Key Responsibilities Lead the design and development of scalable backend services and APIs supporting mobile applications. Architect secure, high-performance API solutions using C#, .NET, and Azure. Provide technical ...

deep technical expertise in Python, LangChain, and OpenAI services, particularly within Azure environments. You will lead the technical delivery of the client’s Chat API, ensuring it is robust, scalable, and continuously improving. Responsibilities Lead the development and enhancement of the Chat API using Python, LangChain, and OpenAI … services on Azure Function Apps Monitor and resolve API bugs and performance issues to ensure high availability and reliability Oversee and troubleshoot data ingestion processes supporting the chatbot’s functionality Collaborate with solution architects, product teams, and the cloud team to deliver a reliable and scalable solution Champion best ...

pure DevOps role. You will spend significant time on platform engineering, CI/CD, and infrastructure – but you will also contribute to application development, API design, and integration work. We need a generalist who leans platform, not an infrastructure specialist who only touches pipelines. What … fast diagnosis and recovery. • Define and track availability and reliability targets; drive post-incident review and preventative improvements. Application Development • Contribute to backend development: API endpoints, service logic, database schema, and integration code. This is a building role, not only an operations role. • Design and implement integration patterns ...

APIs that transform patient data into actionable health recommendations. This role offers the opportunity to shape the full mobile experience while collaborating with product, design, and clinical teams to deliver features that meaningfully improve patient outcomes. What You'll Do Build and ship features for iOS and Android mobile … Connect, enabling seamless data synchronization from digital scales, blood pressure cuffs, activity trackers, and continuous glucose monitors (CGMs) Partner with machine learning engineers to design and implement client-side integrations with internal AI APIs for data analysis, personalization, and clinical decision support Drive end-to-end feature delivery ...

fast-moving startup environment. The Role Technical Strategy & Leadership Work alongside the founder to define and evolve the technical roadmap Lead architectural design and critical technology decisions Champion engineering best practices, code quality, and technical excellence Mentor, coach, and grow engineers at all levels Foster a culture of ownership … collaboration, and innovation Backend Architecture & Development Architect, build, and scale backend services and RESTful APIs Design, optimise, and maintain MongoDB database solutions Improve system reliability, performance, and scalability Resolve complex production issues with robust solutions Implement microservices and modern backend patterns Collaboration & Delivery Partner with Product, Design ...

fast-moving startup environment. The Role Technical Strategy & Leadership Work alongside the founder to define and evolve the technical roadmap Lead architectural design and critical technology decisions Champion engineering best practices, code quality, and technical excellence Mentor, coach, and grow engineers at all levels Foster a culture of ownership … collaboration, and innovation Backend Architecture & Development Architect, build, and scale backend services and RESTful APIs Design, optimise, and maintain MongoDB database solutions Improve system reliability, performance, and scalability Resolve complex production issues with robust solutions Implement microservices and modern backend patterns Collaboration & Delivery Partner with Product, Design ...

remaining close to complex technical problem-solving. Key Responsibilities Lead and develop a high-performing engineering team Own delivery outcomes, quality, and engineering standards Design and evolve distributed, event-driven systems Partner with architecture and senior engineering stakeholders Drive continuous improvement across tooling, CI/CD, and testing Communicate … experience leading engineering teams in an Agile environment Strong expertise in C# and modern .NET/.NET Core Experience building distributed, event-driven systems API design and development (REST, GraphQL) Relational databases (SQL Server, MySQL, or similar) Cloud platforms such as AWS or Azure Solid understanding ...

remaining close to complex technical problem-solving. Key Responsibilities Lead and develop a high-performing engineering team Own delivery outcomes, quality, and engineering standards Design and evolve distributed, event-driven systems Partner with architecture and senior engineering stakeholders Drive continuous improvement across tooling, CI/CD, and testing Communicate … experience leading engineering teams in an Agile environment Strong expertise in C# and modern .NET/.NET Core Experience building distributed, event-driven systems API design and development xkybehq (REST, GraphQL) Relational databases (SQL Server, MySQL, or similar) Cloud platforms such as AWS or Azure Solid understanding ...

Youll collaborate with business and technical teams to drive innovation, modernize architectures, and maximize value from SAPs cloud technologies. What Youll Do: Lead architecture, design, and implementation of solutions using SAP BTP services such as SAP Build, Integration Suite, Event Mesh, AI Core, and HANA Cloud. Define clean-core … Guide teams in building custom apps, workflows, automations, and side-by-side extensions using CAP/RAP and low-code tools. Own integration and API strategies leveraging BTP Integration Suite (APIs, OData, REST/SOAP, event-driven patterns). Provide technical leadership, mentoring developers and ensuring adherence to coding ...

maintain server-side logic using modern backend frameworks (e.g. Node.js, Python, Go) Work with APIs — designing, integrating, and maintaining RESTful endpoints Support database design and optimisation (e.g. PostgreSQL, MongoDB) Collaborate with front-end and product teams to deliver full-stack features Write clean, testable, and maintainable code Help improve ...

development tools across your team Foster culture of learning, experimentation, and knowledge sharing Work with Head of Engineering on architecture, partner with product and design teams About You You're a strong senior engineer ready to lead a team but who still loves writing code. You have solid technical … Strong expertise in Python backend development with async patterns Production experience with modern frontend frameworks (React, TypeScript) Solid understanding of distributed systems architecture and API design Experience with container orchestration, CI/CD, and cloud platforms Experience with NoSQL databases and data modelling Daily user of AI-assisted ...

+ mobile applications Building and maintaining high‐performance APIs and distributed microservices Solving problems around scalability, reliability, security, and automation Working with modern API protocols including GraphQL and gRPC Enhancing the platform that connects both traditional and on‐chain financial services Must‐have experience: Strong backend engineering background with …/or Golang Solid understanding of microservices, event‐driven systems & distributed architecture Strong knowledge of PostgreSQL and/or Redis Understanding of web semantics, API design & backend web standards Proficiency with Git and version control workflows Experience with CI/CD, build automation and modern engineering pipelines Excellent ...

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 ...