1 to 25 of 48 API Design Jobs in London

Solution Architect - Client-facing | TypeScript | API Design | Hybrid (2 Days Onsite in Central London) | £105,000-£110,000 + 15% Discretionary Bonus Method Resourcing is thrilled to be partnering with a global leader in the travel industry who are hiring a Client-facing Solution Architect to join a high-performing architectural team. This is a brand-new role … role that balances strong software knowledge with excellent stakeholder management and communication. What you'll be doing: Lead client-facing solution architecture discussions - mapping technical needs to platform capabilities Design and communicate system architecture diagrams, data flows, and API integrations Build prototypes and proof-of-concepts to test ideas and drive alignment Translate complex requirements into clear deliverables … for both technical and non-technical audiences Collaborate closely with internal engineering and product teams to ensure smooth handover and scalable design Skills and experience we are looking for: Strong software development background (ideally TypeScript and Node) Hands-on experience in solution architecture and API design Ability to build and communicate technical diagrams, flows, and documentation Strong More ❯

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 ❯

Job Description: Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft … modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions. Required Skills: Good experience of: Integration concepts & technologies. MuleSoft Anypoint Platform & components (Mule ESB, API Manager, CloudHub, etc.) Java programming & experience with other programming languages such as XML, JSON, SQL Agile software development methodologies. Cloud-based integration platforms such as Amazon Web Services (AWS … or Microsoft Azure. API design and development. Knowledge of RESTful web services, SOAP, & other integration protocols Familiarity with API design & development best practices Strong problem-solving skills & ability to troubleshoot integration issues. Good communication & teamwork skills Strong understanding of Agile development methodologies & experience working in an Agile environment Nice to Have: Experience with cloud platforms such 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 ❯

Who Are We? Postman is the world’s leading API platform, used by more than 40 million developers and 500,000 organizations, including 98% of the Fortune 500. Postman is helping developers and professionals across the globe build the API-first world by simplifying each step of the API lifecycle and streamlining collaboration—enabling users to create … Battery Ventures, BOND, Coatue, CRV, Insight Partners, and Nexus Venture Partners. Learn more at postman.com or connect with Postman on X via @getpostman. P.S: We highly recommend reading The "API-First World" graphic novel to understand the bigger picture and our vision at Postman. The Opportunity Postman is the world’s leading API platform, helping organizations across every … industry collaboratively design, build, test, document, share, and manage their APIs. Our rocket continues to reach new heights, which is why we are looking for an experienced Solutions Engineer to support our rapidly growing enterprise customer base in the UKI (UK + Ireland) region. As a Solutions Engineer at Postman, you will partner closely with the Sales, Product, and 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 ❯

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 … fraud. Key ResponsibilitiesTelco 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 ❯

envisioning the future of digital assets. We're actively building it. Mission statement We are seeking a Full Stack Web Engineer with a strong sense of UI/UX design and a proven track record in the financial services industry. Experience in the crypto or digital asset domain is highly valued. You will work across the entire technology stack … into elegant, performant solutions. Maintain consistent operational hygiene through clear documentation, smooth migrations, and predictable deployments. Explore and share emerging technologies, with particular interest in Rust, WebAssembly, and modern API frameworks. Background And Experience Proven experience building full stack web applications with strong command of both frontend and backend principles. Proficiency in modern frontend frameworks (Vue, React or similar … and design systems or component libraries such as Shadcn. Experience developing robust backend services, ideally using Rust, or familiarity with typed backend languages Solid understanding of HTTP, RESTful API design, and performance optimisation in web contexts Hands-on experience with relational and/or NoSQL databases, schema design, and query optimisation. Familiarity with Git-based workflows 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 ❯

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 ❯

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 ❯

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 click apply for full job details More ❯

of code quality and security. RESPONSIBLE FOR: Developing high quality, scalable solutions code across both the frontend and backend for landlords and property management professionals. Working collaboratively with Product, Design, and Delivery teams to gather requirements, investigate solutions and translating into technical Building and maintaining an Angular-based web application and Firebase Cloud Functions. Working within a monorepo architecture … and maintain Angular 16+ applications using TypeScript, RxJS, and Angular Material Build and maintain Firebase Cloud Functions using Node.js 20 and TypeScript Implement responsive, accessible UI components following modern design patterns Develop RESTful APIs and integrate third-party services (Stripe, SendGrid, Algolia, Moneyhub, etc.) Work with Google Cloud Platform services including BigQuery, Cloud Storage, Cloud Tasks, and Pub/… on experience with Google Cloud Platform and Firebase services Version Control: Proficient with Git, GitHub workflows, and collaborative development practices Testing: Experience with Jest and test-driven development approaches API Integration: Ability to integrate and work with third-party APIs and services Problem Solving: Strong analytical and debugging skills Communication: Excellent written and verbal communication skills Experience: Minimum More ❯

systems. Skilled in CI/CD practices, with hands-on experience in GitHub workflows. Demonstrated success in automating build, test, and deployment pipelines to enhance development efficiency. Proficient in API design and development, with a deep understanding of RESTful principles and authentication mechanisms. Capable of leading API strategy, development, and integration initiatives. Desired Skills and Qualifications Strong … AWS, Azure, GCP), and across diverse network domains including WAN, SD-WAN, LAN, and WLAN. Certifications such as CCNP/CCIE or equivalent are preferred. Extensive experience in algorithm design, analysis, and optimization, with a strong aptitude for enhancing performance and efficiency in software solutions. Regards Anita 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 ❯

Within our broader data engineering unit, you will champion standardization and reuse, delivering clean, consistent crypto market data and reusable APIs and blueprints that accelerate teams across the organization. Design, build, and maintain a real-time market data pipeline. Aggregate order books, trades, and funding data from multiple exchanges into a single standardized feed, and harden it with redundancy … sharing best practices, contributing to unit-wide standards, and ensuring seamless integration into execution and analytics systems. Continuously document and improve the stack. Main Responsibilities Data Engineering Market Data Design, build, and maintain a robust, low-latency, fault-tolerant market data pipeline. Aggregate order books, trades, and funding data from multiple crypto exchanges into a single standardized feed. Implement … safely and at scale. Collaborate with quantitative analysts to productionize ML pipelines (forecasting load/renewables, anomaly detection, etc.. ) with monitoring and rollback. Mentorship & Technical Oversight Coach engineers through design reviews, pair programming, and clear contribution guidelines; raise the bar on code quality and documentation. Lead incident reviews and architectural forums; provide pragmatic guidance on trade-offs (latency vs. More ❯

LLM-based solutions with LangGraph. Familiar with different multi agent system patterns Build and deploy LLM-based solutions using RAG Familiar with different types of databases: Relational, Graph etc. Design and optimise APIs using Python and FastAPI to serve AI solutions. Familiar with GCP ecosystem and Cloudrun Build and optimise data pipelines for vector search and knowledge retrieval using … experience building solutions using LLMs and Agentic architectures with ADK, LlamaIndex, or LangGraph. Working with vector databases for embedding and indexing. Strong experience with cloud platforms Strong experience with API design and frameworks like FastAPI or Flask Solid experience with relational databases and SQL Interest in expanding your knowledge into GenAI and machine learning Excellent communication skills and More ❯

Back End services and integrations using Python and FastAPI Build and refine data extraction processes against Snowflake/CDP Contribute to the build of a reporting automation platform and API layer Support CI/CD practices, testing, documentation, and deployment standards Experience Strong proficiency in Python and SQL Proven experience developing Back End services using FastAPI Understanding of React … Agile delivery teams Strong analytical capability, with attention to detail and problem-solving mindset Delivery of Python-based applications in reporting, data, or operational settings Full stack development including API design, integrations and UI build Background in regulated or customer-focused environments, Financial Services is a must, ideally Asset & Investment Management. More ❯

and manufacturing across advanced industries. By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive. Note: We are currently recruiting … is a must, a background in Mechanical Engineering or similar is a plus. This role deals with breadth across the full stack, having a solid foundation in software engineering, API design, and deploying applications to production is desired. Proactivity & high ownership: You’ll be responsible for driving impact for our customers, whatever that might look like. We're … models to our customers in a way that delivers maximum value. Work with designers and front-end engineers to shape the UX in line with customer needs. E2E application design: Work with customers to shape tools that are impactful for their teams. Construct low-lift prototypes of your ideas and ship them directly to the customer. Rapidly iterate on More ❯

London (x3 days a week onsite) Salary: Up to £80k DOE Type: Perm Job Description We are looking for a passionate Senior Java Engineer in London to lead the design and development of core product features and services that power an app used by thousands of travellers on a daily basis. As a Senior Java Engineer for an loyalty … and business logic Building out impactful product features Ensure the quality of the features you built, follow-up on usage/issues post release. Work closely with product and design team to deliver new features that align with the needs of the business Provide technical leadership and mentoring to other engineers on the team Contribute and drive frameworks that … team in understanding and adopting new technologies What We're Looking For: Strong programming skills and CS fundamentals combined with 5+ years of experience building products Deep architecture and API design skills to build core services and new product features Strong sense of ownership demonstrated through shipping production-quality code equipped with testing, monitoring and documentation Passion for More ❯

fast to take things to the next level. Youll join as a Senior Backend Engineer , taking ownership of complex Python/Django services that power enterprise decarbonisation. Expect to design elegant APIs, tackle data-heavy challenges, and collaborate closely with sustainability experts and product teams. What makes this special? High-performance engineering team smart, passionate, and collaborative Big mission …/CD, and plenty of greenfield challenges Youll be a great fit if you bring: 7+ years backend experience (Python expertise essential) Strong knowledge of Django (or similar) and API design Experience scaling apps, with an eye for performance and reliability A proactive, problem-solving mindset and love for collaboration Enjoy a collaborative, chic, and modern office environment More ❯

Manchester) Up to £160,000 + benefits/Bonus Join a leading financial technology and trading organisation driving innovation in electronic markets. As an eFX Software Engineer, you'll design and deliver high-performance, low-latency trading solutions that underpin mission-critical systems. This role offers the chance to work on cutting-edge technology where speed, scalability, and resilience … are key. About the Role Lead the design and development of secure, high-performance eFX systems Define and evolve Java patterns and techniques optimised for ultra-low latency (<40s) Architect fault-tolerant, scalable trading systems Influence technical strategy, architecture, and product roadmaps Collaborate with multiple teams to deliver best-in-class E-trading platforms Ensure all solutions meet security … compliance, and performance standards What You'll Bring Strong experience in software engineering, architecture, and database design Expert-level Java development, including low-GC and lock-free patterns Proven background in FX trading systems, pricing, and risk management Deep understanding of CPU architecture, cache optimisation, and Linux performance tuning Expertise in networking and messaging (TCP, UDP, Multicast, FIX) Knowledge More ❯