1 to 25 of 41 API Design Jobs in London

days a week in the office. JNC are working with a leading Insurance client that are looking for an established Technical Architect who specialises in integration architecture, system design and API design within the insurance market. This role is pivotal to the organisation and will be the key bridge between the clients Underwriting Suite, Data Lakehouse, Analytics … data integrity, and performance across the technology landscape. Define enterprise wide integration strategy. Provide technical insight while working with Change, Technology and Data teams on platform architecture & implementations. Technical Design and Governance. Translate strategy into a phased and implementable architecture roadmap. Experience Required: Experience working in the insurance market is beneficial. Ideally Lloyds London market but general Insurance or … financial services is also considered. Over 7 years experience in Technical Architecture. Extensive experience with architecture focused on software development , integration and technical architecture design. Extensive experience with API implementations, Message Queues and Event Driven Architecture. Ideally Azure Service Bus and Kafka. Expert skills with RESTful API design and API Gateway management. Experience with DevOps principles. More ❯

environment is dynamic, supportive, and designed to enable long-term career progression. Role Summary Our client is seeking an experienced Technical Architect with strong expertise in integration architecture, systems design best practice, and API design. The role will take technical ownership of the organisations enterprise technology landscape. This is a pivotal position within the companys scaling and modernisation … Integration Architecture Define the enterprise-wide integration strategy, including the governance of integration patterns (such as synchronous APIs, event-driven architecture, asynchronous messaging, and batch ETL). Lead the design and documentation of internal and external APIs, ensuring best practice in RESTful design, versioning, and OpenAPI standards. Work with Engineering and Data teams to standardise the technical approach … for messaging, data extraction, transformation, and load (ETL/ELT) processes across underwriting, finance, accounting, and data warehouse systems. Design secure, scalable, and auditable architectures for Generative AI, Agentic AI, and large language model (LLM) technologies. Collaborate with data scientists, engineers, and developers to integrate and deploy AI models from development through to production. Define security standards for all More ❯

environment is dynamic, supportive, and designed to enable long-term career progression. Role Summary Our client is seeking an experienced Technical Architect with strong expertise in integration architecture, systems design best practice, and API design. The role will take technical ownership of the organisation’s enterprise technology landscape.This is a pivotal position within the company’s scaling and … Integration Architecture Define the enterprise-wide integration strategy, including the governance of integration patterns (such as synchronous APIs, event-driven architecture, asynchronous messaging, and batch ETL). Lead the design and documentation of internal and external APIs, ensuring best practice in RESTful design, versioning, and OpenAPI standards. Work with Engineering and Data teams to standardise the technical approach … for messaging, data extraction, transformation, and load (ETL/ELT) processes across underwriting, finance, accounting, and data warehouse systems. Design secure, scalable, and auditable architectures for Generative AI, Agentic AI, and large language model (LLM) technologies. Collaborate with data scientists, engineers, and developers to integrate and deploy AI models from development through to production. Define security standards for all More ❯

AI Engineer to build and scale cutting-edge AI capabilities that drive smarter decisions and greater efficiency across Chambers and Partners. In this brand new role, role, you’ll design and implement intelligent systems that enhance how we use data, streamline operations, and power innovation across our digital platforms. You’ll play a key role in establishing the technical … deliver value to our users. Main Duties and Responsibilities Data & Retrieval Build robust ingestion pipelines for PDFs/Word/Excel/Audio/JSON and semi-structured sources. Design RAG systems: chunking strategies, document schemas, metadata, hybrid/dense retrieval, re-ranking, and grounding. Manage vector/keyword indexes (e.g., Azure AI Search, pgvector, Pinecone/Weaviate). … NLP, information retrieval, and recommendation systems that enhance Chambers and Partners’ research and product offerings, including document understanding, automatic summarisation, topic modelling, semantic search, entity recognition, and relationship extraction. Design and implement intelligent tagging and metadata enrichment frameworks to categorize and organize legal and market data, improving search, discoverability, and insight accuracy. LLM & Machine Learning Application Engineering Design More ❯

collaborative environment.Imagine being the person who sets the technical vision for a business that values innovation, simplicity, and excellence. You’ll lead on: Integration Architecture: Define enterprise-wide strategies, design APIs, and ensure seamless connectivity across systems. Platform Architecture: Shape modular, scalable platforms and guide technology selection for new initiatives. Technical Governance: Translate business strategy into actionable architecture roadmaps … cutting-edge capabilities like AI-driven solutions and advanced data platforms. What You’ll Need Proven experience as a Technical Architect in complex, enterprise environments. Mastery of integration principles, API design, and secure connectivity. Strong understanding of cloud platforms and modern architecture patterns. Excellent communication skills to engage both technical and non-technical stakeholders. Ability to lead, mentor … ll be joining a vibrant, inclusive culture where you can make an impact from day one .If you bring 10+ years of technical leadership , deep expertise in integration patterns, API design, and enterprise architecture , and the ability to influence and inspire technical teams , we want to hear from you. Apply now to join a company where your ideas More ❯

Senior API Technical Consultant (GraphQL Specialist) Design and build next generation of high-scale SaaS platforms. We're looking for a senior/lead engineering consultant with deep expertise in GraphQL to take a leading role in developing our robust TypeScript/Node.js backend. You will be instrumental in shaping our technical direction, driving the evolution of our … APIs, ensuring our services are resilient, scalable and secure within a cutting-edge, cloud-native environment (Helm, Kubernetes). The Deliverables Design and build sophisticated, scalable GraphQL APIs and backend services using TypeScript and Node.js. Lead the design and evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. Champion best … team to guide process improvements and make key architectural decisions. Experience Extensive production experience architecting and delivering complex applications with TypeScript and Node.js . Expert level GraphQL , including advanced API design, schema evolution, performance optimisation. Strong automated testing frameworks like Vitest and Playwright . Proficiency with modern DevOps tooling and cloud-native architecture, including Docker , Helm , Kubernetes . More ❯

SAP Business Technology Platform (BTP) . Role Overview As the MES Integration Lead , you will: Lead the integration workstream for the MES program, aligning with architecture and business objectives Design and implement integration solutions using SAP BTP Integration Suite , including: Cloud Integration (CPI) for iFlows and system connectivity API Management for secure and scalable API exposure Event … Document integration designs, configurations, and operational procedures Required Skills & Experience Experience in system integration, including SAP BTP Integration Suite Proven expertise in: Cloud Integration (CPI) - designing and deploying iFlows API Management - API design, security, lifecycle management Event Mesh - event-driven architecture and messaging patterns Understanding of manufacturing processes and MES integration patterns Experience delivering end-to-end More ❯

transformation programme, and are looking for an experienced Integration Architect to join on a 12-month contract . This role is ideal for someone who specialises in system integration, API design, and cloud-based architecture (Azure) and enjoys shaping strategy as well as guiding delivery teams. Key Responsibilities Define and deliver the integration architecture strategy for a group … wide transformation. Design and govern API-led integrations, interface specifications, message schemas, and data flows. Work closely with Solution Architects, Cloud Architects, Product Owners and delivery teams to ensure scalable, secure and future-proof integration solutions. Champion integration best practices, standardisation and reusability across programmes. Provide technical leadership, documentation, and mentorship to delivery teams. Ensure all integration solutions … data protection standards. What We're Looking For Proven experience as an Integration Architect/Solution Architect with strong integration focus Hands-on knowledge of Microsoft Azure integration services (API Management, Service Bus, Logic Apps, Event Grid, etc.) Strong understanding of enterprise integration patterns, API management platforms (Apigee/Azure API Mgmt) Experience working in agile delivery More ❯

a standard backend role. We are seeking a foundational engineer to own our single greatest strategic asset: our unique, privileged access to network-level intelligence via the GSMA CAMARA API standard. This is our right to win, and you will be the engineer responsible for building the bridge to it. You will be the Critical Path Owner for Track … Key Responsibilities Telco Integration & Architecture ? Own and build the Security Signal Ingestion path, the secure, low-latency, and out-of-band data channel connecting to our founding members' network API gateways. ? Architect and implement a carrier-agnostic, vendor-agnostic connector layer to consume RESTful APIs from a heterogeneous global landscape of telco partners and IMS vendors (e.g., Nokia, Ericsson … technical liaison to the engineering teams at our telco founders (Deutsche Telekom, Singtel, SKT, etc.), working hand-in-glove to navigate, validate, and productionize their new CAMARA network APIs. ? Design and build the high-throughput microservices that will query, ingest, normalize, and cache network signals (e.g., sim-swap, device-roaming-status) to be used in our real-time Scam More ❯

a standard backend role. We are seeking a foundational engineer to own our single greatest strategic asset: our unique, privileged access to network-level intelligence via the GSMA CAMARA API standard. This is our right to win, and you will be the engineer responsible for building the bridge to it. You will be the Critical Path Owner for Track … Key Responsibilities Telco Integration & Architecture Own and build the Security Signal Ingestion path, the secure, low-latency, and out-of-band data channel connecting to our founding members' network API gateways. Architect and implement a carrier-agnostic, vendor-agnostic connector layer to consume RESTful APIs from a heterogeneous global landscape of telco partners and IMS vendors (e.g., Nokia, Ericsson … technical liaison to the engineering teams at our telco founders (Deutsche Telekom, Singtel, SKT, etc.), working hand-in-glove to navigate, validate, and productionize their new CAMARA network APIs. Design and build the high-throughput microservices that will query, ingest, normalize, and cache network signals (e.g., sim-swap, device-roaming-status) to be used in our real-time Scam More ❯

robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important. Responsibilities Working in a team of Front-End engineers Writing clear & concise code Working closely with Back-End engineers Participate in architecture design code reviews API design with the Back-End engineers and other team members to establish more functional, cohesive code Create, maintain documentation while implementing the best coding practices standards Hands-on approach Participation in sprint rituals What you’ll need 6+ years experience developing large-scale web applications Experience working in an agile environment Strong experience with More ❯

leadership, and execution in a high-stakes financial services environment. Architectural Leadership: Define and own the technical roadmap, architectural patterns, and standards for a complex, distributed platform. Distributed Systems Design: Drive the design of high-scale, resilient, and fault-tolerant cloud-native solutions, including HA/DR strategies. Engineering Excellence: Set and maintain engineering standards, manage technical debt … with a proven track record of 10+ years in senior technical leadership roles. Experience: 10+ years in senior technical leadership roles, with proven track record leading enterprise-grade solution design and delivery. Architecture: Deep expertise in distributed systems , microservices , and event-driven architectures . High Availability: Mastery of HA/DR patterns , fault tolerance, and resilience engineering for mission … Cloud Platforms: Strong experience with major public cloud architecture (e.g., AWS/Azure/GCP ), including PaaS, IaaS, and serverless solutions. Fintech Domain: Understanding of financial services technology requirements: API design, data security, transaction integrity, and audit trails . Pragmatism: Ability to balance intentional architecture with pragmatic delivery, knowing when to build vs. buy. We seek a leader More ❯

practice and technology to all areas of our business specifically designed for our global reach. About the Role We're seeking a Principal Full Stack Engineer to lead the design, development, and scaling of AI-powered digital products that serve infrastructure, engineering, and consulting professionals around the globe. This is a hands-on leadership role that blends deep technical … providing technical direction and mentoring a small cross-functional team of engineers and data scientists, helping ensure excellence and strong delivery outcomes. What You'll Do Build scalable products: Design, build and maintain robust, secure full-stack applications that integrate AI/ML models and serve our external clients and internal users across Mott MacDonald at global scale. Lead … including CloudWatch, Sentry, or DataDog, to ensure application stability, performance optimisation, and effective issue resolution Experience managing or mentoring engineering teams, including cross-functional collaboration. Understanding of secure architecture, API design, and performance optimisation. Experience with modern DevOps practices including CI/CD, containerisation (Docker, Kubernetes), and infrastructure as code (Terraform). Why Join Us Build purposeful, high More ❯

Job Description Purpose of the role To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. Accountabilities Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized for performance. Cross-functional collaboration … excellence and growth. Adherence to secure coding practices to mitigate vulnerabilities, protect sensitive data, and ensure secure software solutions. Implementation of effective unit testing practices to ensure proper code design, readability, and reliability. Vice President Expectations To contribute or set strategy, drive requirements and make recommendations for change. Plan resources, budgets, and policies; manage and maintain policies/processes … Empower, Challenge and Drive – the operating manual for how we behave. Embark on a transformative journey as a Senior Full Stack Developer. At Barclays, our vision is clear – To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. To be successful as a Full Stack Developer, you More ❯

Solution Architect Permanent role Job Location : London ( Hybrid) Languages: C#, Python, SǪL Tech Stack: Azure GCP, DDD, EDA, Microservices, API Integration, Distributed Systems Architecture Frameworks: TOGAF, Well Architected, CNCF Cloud Platforms: Microsoft Azure, K8s, familiarity with AWS, Google Cloud Platform Must Have : TOGAF certification, Cloud experience (Azure), Terraform, CI/CD (ADO/GHA), API design and … integration Technologies: EDA, Microservices, API Integration, DDD, Distributed Systems Tools: Visio, UML, Ardoc, Enterprise Architect, Terraform, ADO (for CI/CD), Docker, Kubernetes Nice to Have : Financial Industry experience, Kubernetes, Docker, Experience with security and compliance frameworks (ISO27001 More ❯

Full-Stack Development Solid software engineering background with proficiency in Python, JavaScript/TypeScript, Java, or Go Experience with modern frameworks (React, Node.js, Django, FastAPI) Knowledge of microservices architecture, API design (REST, GraphQL) Experience with containerization (Docker, Kubernetes) and cloud-native development patterns DevOps & SRE Practices Experience implementing CI/CD pipelines and DevOps methodologies Knowledge of infrastructure More ❯

and event-driven systems Contribute to full-stack applications using React Work with Docker , Kubernetes , AWS/Azure Model workflows with Camunda/BPMN (or learn on the job) Design and optimise data models in PostgreSQL and MongoDB Support CI/CD, automation, and DevOps practices Collaborate with clients and internal teams; share technical expertise Essential Experience Strong Java …/Spring Boot engineering background Experience with microservices and modern API design Exposure to Docker, Kubernetes, and cloud environments (AWS) SQL/NoSQL experience (PostgreSQL, MongoDB) Strong communication and problem-solving skills Adaptable, proactive, and comfortable in a scaling organisation Security Clearance Requirements Due to the sensitive nature of projects, candidates must be eligible for SC and DV … not clock-watching Work directly with founders: High trust, high challenge, high support Shape the future: Influence engineering standards, culture, and service offerings End-to-end ownership: Autonomy to design, build, and ship meaningful work Impact that matters: Build solutions used by millions across the UK public sector Low-ego environment: Collaborative, sociable, and free from big-firm bureaucracy More ❯

and event-driven systems Contribute to full-stack applications using React Work with Docker , Kubernetes , AWS/Azure Model workflows with Camunda/BPMN (or learn on the job) Design and optimise data models in PostgreSQL and MongoDB Support CI/CD, automation, and DevOps practices Collaborate with clients and internal teams; share technical expertise Essential Experience Strong Java …/Spring Boot engineering background Experience with microservices and modern API design Exposure to Docker, Kubernetes, and cloud environments (AWS) SQL/NoSQL experience (PostgreSQL, MongoDB) Strong communication and problem-solving skills Adaptable, proactive, and comfortable in a scaling organisation Security Clearance Requirements Due to the sensitive nature of projects, candidates must be eligible for SC and DV … not clock-watching Work directly with founders: High trust, high challenge, high support Shape the future: Influence engineering standards, culture, and service offerings End-to-end ownership: Autonomy to design, build, and ship meaningful work Impact that matters: Build solutions used by millions across the UK public sector Low-ego environment: Collaborative, sociable, and free from big-firm bureaucracy More ❯

to the development of core components of our stack—from designing performant transpilation passes and hardware integrations to expanding our cloud‐native SDK and CI/CD pipelines. Responsibilities Design and implement the hybrid quantum‐classical workflow orchestration. Integrate advanced error‐mitigation techniques, develop novel quantum application primitives, and optimize system performance (including low-level implementations where necessary). … as: Quantum circuit optimization Gate decomposition and mapping DAG structures and graph manipulation Basis gate sets and device-specific transformations Experience working close to quantum hardware APIs. Experience of API-level interaction and understanding of device-specific properties (e.g., coherence times, gate fidelities, execution queues) Requirements Strong experience in Python and modern software engineering practices Be comfortable with low … level programming when needed (e.g. C++, Rust, C) Strong software engineering background, including: Design patterns Data structures and algorithms API design (REST) Working with databases (SQL and NoSQL) Writing documentation and integration tests Understanding of functional programming concepts (e.g. monoids, composition, higher-order functions) Familiarity with quantum computing concepts such as: Quantum circuits Measurements, observables Noise channels More ❯

UK, CA, ES, and many more countries. Check our Notion Candidate Handbook and our GitHub This role is ideal for someone with 5+ years of software engineering experience, strong API design skills, and solid backend expertise. You'll work on Snowflake and AWS big data emulators, building features and ensuring high-fidelity cloud platform emulation to help developers … local development loop with meaningful error messages, good performance, and easy configuration. Improve emulator usability in CLI tools, SDKs, and client integrations (e.g., JDBC, SnowSQL, 3rd part integrations). Design and implement support for additional data platform features, services, and cloud providers (e.g. Azure Synapse, BigQuery). Track cloud service evolution and update emulators to reflect new capabilities or More ❯

and Carlos Cadenas (Index Ventures, GoCardless, Skyscanner). The Role: Technical Lead We are looking for a Technical Lead to join our high-calibre software engineering team. You will design, build, and maintain the core services and APIs that power our proprietary platform, with opportunities to contribute to both back-end and front-end codebases, and explore AI & LLMs … you will help drive the next evolution of our platform, designing architecture, managing engineers and shaping how we integrate AI and large language models into our products and workflows. Design, implement, and maintain scalable back-end services and APIs (primarily in Go, with Python for scripting and data). Mentor and manage team members and share knowledge across disciplines. … Lead by example, build fast and help shape our technical roadmap. Take full lifecycle ownership of end-to-end delivery — from technical design and implementation through to testing, deployment, and monitoring. Contribute to front-end code (VueJS) as needed, supporting a collaborative, full stack environment. Work with relational databases (Postgres) and NoSQL solutions (e.g., MongoDB, Redis). Participate in More ❯

provide the single source of truth and a scalable platform for business units to leverage. We're hiring a Core Engineer to join the team and help lead the design and delivery of a new internal platform. Mission Be a key player in the newly formed Core Engineering team at Flowdesk to build a world class back office system … Expose well-versioned APIs and event streams for downstream consumers; maintain backward compatibility and schema evolution. Ways of working Follow established architecture and coding standards; participate in RFCs/design reviews and propose incremental improvements within existing patterns. Write clean, well-documented code and meaningful tests. Contribute to PR reviews; maintain up-to-date technical docs and diagrams. Own … internal stakeholders across Trading, Ops, Compliance, and Engineering. Must Haves - Technical Strong OO background in one or more, Go, C++, C#, Java or Rust. Experience with Typescript and Python. API design (versioning, backwards compatibility, observability) Postgres schema design and query optimization. Experience with message queue/pub-sub systems. Familiarity with cloud environments (GCP, AWS, Azure), modern More ❯

platform supporting the full private client mortgage journey. We’re looking for an experienced engineer who combines deep .NET and Azure expertise with a collaborative, pragmatic mindset. You’ll design and implement the backend services, APIs, and integrations that power our lending ecosystem, while working closely with front-end, product, and infrastructure teams. This is a role for someone … ways of working and shared engineering principles. You’ll be part of a team where architectural thinking, reliability, and craftsmanship are valued just as much as delivery speed. Responsibilities Design, build, and maintain backend services using C# (.NET 8+) and Azure Services. Develop and secure Modern Distributed Systems using Azure Container Apps, integrating with internal systems. Work with Service … Bus, Azure SQL, API Management, and Key Vault to deliver robust, secure, and scalable solutions. Design and optimize data models and SQL queries where needed for high-volume, transactional workloads. Contribute to CI/CD pipelines in Azure DevOps, ensuring code quality and deployment reliability. Collaborate with front-end engineers to ensure efficient API design and More ❯

practice law, leading to exceptional outcomes for clients and lawyers. Lawhive Labs is how we bring this vision to life. It's our frontier lab that combines top engineering, design, AI and legal talent from around the world, joining forces to build the future of law. We're backed by top-tier investors, including Google Ventures, Balderton Capital and … and async workflows to process large-scale AI workloads efficiently. Ensuring security & compliance in AI-driven legal services. Requirements Strong Python experience in building scalable backend systems. Familiarity with API design & distributed systems architecture. Experience working with event-driven architectures (e.g. Kafka, Pub/Sub, AWS Step Functions, etc.). Experience working with cloud platforms (AWS, GCP etc … of the legal industry and experience working with legal technology solutions. Interview process Introductory call with our Talent team 1:1 with your hiring manager Live technical assessment - systems design and pairing with two of our engineers Values interview with our CTO/Co-founder We offer UK Benefits: Meaningful early-stage equity at one of Europe's fastest More ❯

in the Cloud, and our IoT devices that interface with Mytos hardware to manufacture cells. You'll contribute across a variety of technologies and paradigms, leaning how to research, design, implement, maintain, and evolve product functionality giving users powerful tools to customise and monitor cell growth protocols. Your work will directly impact how quickly and effectively new therapies and … on the nuances of stem cells, to the basics of fluid mechanics. Be given a lot of autonomy, responsibility, and ownership of product problems and the technical solutions you design and deliver to address customer needs. What We're Looking For (depending on experience level) Are early in your software career and want to join an environment that gives … for customers and colleagues. Experience with full-stack web development using TypeScript or other typed languages. Experience with modern frontend frameworks (React preferred). Experience with backend development and API design preferred). Experience working with databases (PostgreSQL and Prisma or similar ORM experience ideal). Our technologies Frontend (Netlify): React, TypeScript, GraphQL, Storybook Backend (AWS & Heroku): NodeJS More ❯