1 to 25 of 37 API Design Jobs in London

Technical Architect

Hiring Organisation
Morgan Hunt Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£46,000 - £52,000 per annum
manage the flow of technology change proposals and ensure all documentation is complete, accurate, and processed efficiently. Collaborate closely with project teams during the design stage and support build and deployment activities where appropriate. Contribute to Request for Proposal (RFP) documentation and assess supplier responses. Work collaboratively with Technology … Technical Architect or similar technical leadership role, ideally with a track record of delivering complex projects. Strong understanding of software architecture principles, design patterns, and industry best practices. Core Technical SkillsA broad technical foundation is essential. Key technologies include: Microsoft Azure - Azure App Services, Azure Functions, Azure DevOps, Azure ...

Mulesoft Developer

Hiring Organisation
Experis
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£470 - £520/day
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 … 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 ...

Lead Full-Stack Developer

Hiring Organisation
Goodman Masson
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£80,000 - £110,000 per annum
shaping Meteor's digital future. Key Responsibilities Lead, mentor, and inspire a team of developers, fostering a culture of technical excellence and continuous improvement Design, develop, and maintain high-quality software solutions across the full stack Architect and implement systems using .NET, JavaScript, SQL, and modern frontend frameworks Oversee … API design and integrations, ensuring secure and efficient data exchange Translate business and stakeholder requirements into clear technical solutions Conduct code reviews and ensure adherence to coding, security, and quality standards Drive continuous improvement in development workflows, testing, and deployment practices Support the professional development of team members ...

Full Stack Engineer (Front End & Application experience) React + Typescript

Hiring Organisation
Deltabase
Location
South London, UK
Employment Type
Full-time
testing practices that protect key user flows. We're looking for someone who enjoys high ownership, moves fast with quality, and works closely with design and Product Lead. React + TypeScript (must-have) Salary:£55,000–£75,000 base + equity (EMI options) Experience: 5+ years Location: UK-based … shaping how users interact with insights in the platform. As our team grows, you'll also collaborate more closely with backend engineering to influence API design and application architecture, but the initial focus is on front end delivery and product feature ownership. Key Responsibilities Build and Own Product ...

Back End Developer

Hiring Organisation
RevTech
Location
City of London, London, United Kingdom
platform Ship production to code and have end to end ownership of your work Working on complex challenges such as financial transaction analysis and API design Play a Key role in shaping their engineering culture as they continue to grow their team What they need: A product minded … Backend weighted but having some exposure to Frontend technologies would be beneficial) Ideally experience in or an interest in FinTech. Good experience with API design and databases (they are using PostgreSQL) Key Details: Salary £60k-£80k depending on experience London based (Hoxton), 4 days onsite Benefits include ...

Fullstack Developer

Hiring Organisation
LA International Computer Consultants Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP Daily
driven integrations on AWS. Technical skills: - Front End: JavaScript, HTML; responsive UI patterns and web standards. - Back End: Node.js and Spring Boot microservices; RESTful API design and API management (policies, rate limiting, security), EKS (Kubernetes), Containerisation (Docker). - Proficient in Kubernetes & Containerisation of Applications - Docker - Integration: data … layer integration; event driven design with Kafka; NoSQL (MongoDB/DocumentDB). - Security: IDAM/IdP, SSO, RBAC, SSL/TLS, KMS (key management and envelope encryption patterns), Graph API. - Cloud operability: telemetry and logging on AWS; performance and availability monitoring. - Tooling & delivery: Jira, Confluence, GitHub, CI/ ...

AI UX Engineer - £350PD - Remote

Hiring Organisation
Tenth Revolution Group
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£300 - £350 per day
Embedding model optimisation and semantic search Context window management and chunking strategies MCP & Tool Integration Model Context Protocol (MCP) implementation LLM tool calling and API design AWS Lambda integration with agents AI Safety & Evaluation Guardrail implementation (hallucination detection, toxicity filtering) Response evaluation frameworks and A/B testing … Advanced Python AWS SDK (boto3) Infrastructure as Code awareness (CloudFormation/Terraform) Git and CI/CD for ML systems UX Engineer - Skills & Requirements Design & Prototyping Advanced Figma skills Wireframing, interactive prototyping, and design systems Responsive web and mobile design Conversational UX Chatbot and conversational interface design ...

Technical Architect - London - £120,000 p/a + Bonus + Benefits

Hiring Organisation
JNC Recruitment Limited
Location
City of London, London, United Kingdom
Employment Type
Permanent
technology landscape. Define enterprise wide integration strategy. Provide technical insight while working with Change, Technology and Data teams on platform architecture & implementations. Technical Design/Governance. Translate strategy into a phased and implementable architecture roadmap. Stakeholder Management Experience Required: Architecture focused on software development, integration and technical architecture design. … API implementations, Message Queues and Event Driven Architecture - (ideally Azure Service Bus and Kafka). RESTful API design and API Gateway management. DevOps principles. CI/CD tools. Azure platform - (including IaaS, PaaS, Azure Databricks, Azure Data Factory and Azure Storage). In line with ...

Industry Principal- LLMs, agentic coding systems, intelligent IDEs, AI development platforms

Hiring Organisation
Infosys
Location
City of London, London, United Kingdom
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 ...

Computer Vision & SDK Development Lead

Hiring Organisation
YEO Messaging
Location
London Area, United Kingdom
looking for an experienced Kotlin & Swift Developer with strong computer vision experience to design, build, and maintain a high-performance Software Development Kit (SDK) used in security-critical mobile applications. This role sits at the intersection of mobile engineering, applied computer vision, and SDK architecture , and will play … role in delivering reusable, secure, and developer-friendly components used by third-party teams and partners. Key Responsibilities SDK Design & Development Design and develop a cross-platform mobile SDK (iOS & Android) using Swift and Kotlin Create clean, modular, well-documented SDK APIs for external developers Ensure ...

Principal Engineer React, Typescript, C#, AWS (Serverless), MySQL

Hiring Organisation
Smart Sourcer Limited
Location
City of London, London, United Kingdom
Employment Type
Permanent
Service (PaaS) environment. What Youll Be Doing: Own architecture and technical decisions across squads; accountable for how software is built and shipped. Design and develop distributed, scalable microservices (C# .NET Core or Node.js) and REST/JSON APIs. Build modern React + TypeScript UIs with component-driven design, advanced state management, and reusable frameworks. Leverage AWS services (Lambda, API Gateway, SQS/SNS, Step Functions, S3, IAM) to deliver secure, event-driven systems. Embed testing-first practices (TDD/BDD, contract tests, Jest/RTL, Playwright/Cypress, xUnit/NUnit) to raise code quality. Implement ...

Cloud Platform Engineering Lead / DevOps Lead

Hiring Organisation
KBC Technologies UK LTD
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
Salary negotiable
Hybrid Employer: Global Technology Consultancy Mandatory Skill: Google Kubernetes Engine (GKE) Role Purpose We are seeking a hands-on Cloud Platform Engineering Lead to design, build and operate secure, automated cloud platform capabilities. You will enable product teams to deliver API-first services rapidly and reliably, while balancing … deep technical work with coaching and engineering leadership. Key Responsibilities Design, build, and operate platform capabilities using Infrastructure-as-Code and modern CI/CD . Embed secure-by-design principles from architecture to runtime. Define and manage SLOs/SLIs ; drive observability, performance tuning, and automation. Promote ...

Senior Product Manager

Hiring Organisation
Tiro Partners Limited
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£60,000 - £90,000 per annum
/API/Ecommerce/Product design/PDP/Tourism Role: Product Manager Compnay: Ecommerce Location: East London Onsite: Hybrid 2/3 day per week onsite Salary: up to £90,000 + Bonus We're looking for an experienced Product Manager to own and evolve core … shape platform-adjacent products including APIs, pricing models, and rules-based systems Develop product plan to boost CRO. Partner closely with engineers on API contracts, integrations, and architectural trade-offs Translate complex workflows and data flows into clear, scalable product structures Lead cross-functional discussions, aligning technical decisions with ...

Full-Stack Software Developer

Hiring Organisation
Sanderson
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£520 per day
/17+) Deep Spring Boot & microservices experience Strong AWS skills (EC2, S3, Lambda, IAM) Kafka/event-driven systems SQL optimisation REST/JSON API design Docker proficiency Excellent communication skills Nice to Have JavaScript/React Aurora/RDS If you're proactive, outcomes-driven, and thrive ...

Senior Software Engineer (PHP)

Hiring Organisation
True9
Location
South London, UK
Employment Type
Full-time
front-end teams in a fast-paced Agile environment. You'll thrive in this role if you have: Strong working experience in PHP, OOP, design patterns and principles, including SOLID Strong understanding of automated testing practices Expertise in performant MySQL and relational database design Hands-on experience with … API design and development Comfortable using modern tooling, including Docker, Git, PHPStan, PHPUnit and CI/CD Experience in Symfony Familiarity with cloud services, particularly AWS Experience in agile environments and contributing to team collaboration A proactive, solutions-oriented mindset and excellent communication skills The tech stack ...

Staff Software Engineer (Golang)

Hiring Organisation
Oliver Bernard
Location
London Area, United Kingdom
from scratch and creating platforms like Kafka. Being hands-on within a team delivering projects and solving tough tech problems. What You’ll Do Design and implement robust, scalable microservices and APIs in Go Lead the technical design of distributed data systems supporting research and clinical workflows Collaborate … distributed systems , data-intensive applications , and microservices architectures Experience with cloud environments (AWS, GCP, or Azure) and container orchestration (Kubernetes, Docker) Solid background in API design , data streaming , and event-driven architectures (Kafka, NATS, RabbitMQ) Proven leadership in technical design and mentoring Strong collaboration and communication skills ...

Solution Architect

Hiring Organisation
Henderson Scott
Location
North West London, London, United Kingdom
Employment Type
Permanent
Salary
£75,000
Pension, Support Leave Salary: £70,000 - £75,000 Per Annum. Overview A key role within the Technology function, responsible for shaping solution design for a major business programme. You'll ensure solutions align with architectural standards, support integration and reporting platforms, and work closely with engineering teams and suppliers … deliver high-quality, scalable, and secure outcomes. Key Responsibilities Lead solution design across major programme workstreams, aligning with architectural vision and technical standards. Support cloud and data governance; define best practice for integration and reporting. Maintain and enforce standards for API design, integration patterns, data schemas (including ...

Senior Full-Stack Developer

Hiring Organisation
Goodman Masson
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£40,000 - £70,000 per annum
work across frontend and backend systems, help shape technical solutions, and ensure best practices are followed throughout the development lifecycle. Key Responsibilities Design, develop, and maintain high-quality software solutions across the full stack Build and integrate APIs, ensuring secure and efficient data exchange Develop user interfaces using modern … Requirements Proven experience as a full-stack developer Strong proficiency in .NET (C#), JavaScript, and modern frontend frameworks Solid experience with SQL databases and API design and integration Excellent problem-solving, communication, and organisational skills Ability to work proactively on independent projects and collaboratively within a team Familiarity ...

Senior AI Engineer

Hiring Organisation
Chambers and Partners
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
Competitive salary
drive smarter decisions and greater efficiency across Chambers and Partners. In this brand new role, role, as part of our Data team, 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 … 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 ...

Application Security Engineer

Hiring Organisation
Atrium Global
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
From £550 to £650 per day
strengths and weaknesses of each At least one programming language (e.g. Java, Go) At least one major cloud provider (e.g. AWS, GCP, Azure) REST API design HTTP Authentication Linux at the terminal, including scripting and automation (e.g. shell, Python) Some other highly valued skills may include: Experience with ...

AppSec Engineer / Application Security Engineer

Hiring Organisation
Atrium Workforce Solutions Ltd
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£550 - £650 per day
strengths and weaknesses of each At least one programming language (e.g. Java, Go) At least one major cloud provider (e.g. AWS, GCP, Azure) REST API design HTTP Authentication Linux at the terminal, including scripting and automation (e.g. shell, Python) Some other highly valued skills may include: Experience with ...

Chief Technology Officer

Hiring Organisation
RedTech Recruitment
Location
South London, UK
Employment Type
Full-time
Cloud Architecture/AWS/Serverless Architecture/SQL Server/.NET/C#/Go/React/SaaS Platforms/Microservices/API Design/Event-Driven Architecture/DevOps/CI/CD Pipelines/Computer Science/Software Engineering/Information Systems/***************************************************************************************************** RedTech ...

AI Platform Engineer

Hiring Organisation
The Portfolio Group
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
Competitive salary
owning the cloud-native platform that underpins conversational AI and generative AI products at scale. Sitting at the core of AI delivery, you will design, build, and operate the runtime, infrastructure, and operational layers supporting RAG pipelines, LLM orchestration, vector search, and evaluation workflows across AWS and Databricks. Working … platform powering conversational assistants and generative AI products. Build, operate, and optimise RAG and LLM-backed services, improving latency, reliability, and cost. Design and run cloud-native AI services across AWS and Databricks, including ingestion and embedding pipelines. Scale and operate vector search infrastructure (Weaviate, OpenSearch, Algolia, AWS Bedrock ...

Founding Engineer (Full Stack / Backend)

Hiring Organisation
Affinity Labs
Location
London, UK
Employment Type
Full-time
early-stage, hands-on role with significant autonomy and responsibility to drive backend product development, collaborating closely with founders, creators, and product/design to turn lean specs into reliable, scalable services. Responsibilities Implement features end-to-end on the backend (APIs → data models → integrations) and maintain quality while … z2bz0 years building production backends/services, with shipped work and clear ownership. Strong Python (FastAPI) and database skills (PostgreSQL/MongoDB); solid API design fundamentals. Familiarity with AWS serverless patterns and Docker for bespoke services; basic CI/CD concepts. Comfortable with Redis (caching/sessions ...

Senior Software Engineer

Hiring Organisation
Bounce Digital
Location
City of London, London, United Kingdom
Great Fit If You: Have 5+ years’ experience building production-grade web apps with React + TypeScript Are comfortable across the stack - API design through to front-end polish Have experience with AWS or similar cloud infrastructure Care about ownership, quality, and impact Are curious about AI, automation ...