26 to 50 of 82 API Design Jobs in London

Java / Cloud Technical Lead - London, Wembley

Hiring Organisation
Adecco
Location
London, United Kingdom
Employment Type
Permanent
Salary
£75000 - £80000/annum + Benefits
just familiarity, but production ownership. Azure Integration: Proven experience building applications that consume Azure-native services, including Azure Key Vault for secrets, Azure Storage API, and Azure Service Bus for event-driven messaging. DevOps Mindset: Solid understanding of the full CI/CD lifecycle; comfortable reading and contributing … Dockerfiles and GitHub Actions YAML workflows - not as a DevOps engineer, but as a developer who understands the pipeline their code flows through. API Mastery: Deep expertise in RESTful API design principles, OAuth2 authentication flows (including FusionAuth integration), and DMARC-compliant transactional email logic via SendGrid. Duties ...

Lead Java Modernization Engineer - London, Wembley

Hiring Organisation
Adecco
Location
London, United Kingdom
Employment Type
Permanent
Salary
£75000 - £80000/annum + Benefits
just familiarity, but production ownership. Azure Integration: Proven experience building applications that consume Azure-native services, including Azure Key Vault for secrets, Azure Storage API, and Azure Service Bus for event-driven messaging. DevOps Mindset: Solid understanding of the full CI/CD lifecycle; comfortable reading and contributing … Dockerfiles and GitHub Actions YAML workflows - not as a DevOps engineer, but as a developer who understands the pipeline their code flows through. API Mastery: Deep expertise in RESTful API design principles, OAuth2 authentication flows (including FusionAuth integration), and DMARC-compliant transactional email logic via SendGrid. Duties ...

Java Technical Lead

Hiring Organisation
Michael Page
Location
London, United Kingdom
Employment Type
Permanent
Salary
£80000 - £90000/annum
manage technology teams to deliver high-quality software solutions. Collaborate with stakeholders to understand business requirements and translate them into technical deliverables. Oversee the design, development, and implementation of technical solutions. Ensure best practices in coding, testing, and deployment are followed. Provide technical mentorship and guidance to team members. … modern Java (17+) is non-negotiable. 2+ years leading engineering teams or operating as a tech lead/lead engineer with ownership of design and delivery outcomes. Deep Spring Boot expertise: REST APIs, Spring Security, Spring Data, Spring Cache; proven ability to set patterns others follow. Strong command ...

Senior Python Engineer (Django / DevOps / IaC)

Hiring Organisation
Pontoon Solutions
Location
City of London, London, United Kingdom
cloud-native systems across the business by making security tooling fast, reliable, and seamless for every development team. You will be responsible for Design, develop, and maintain scalable REST APIs using Django. Build and operate asynchronous task pipelines (Celery/Redis) that orchestrate security scanning at scale. Ensure best … practices for code quality, performance, and security. Integrate robust security practices into all API layers, including authentication, authorization, data validation, and protection against vulnerabilities. Develop and manage CI/CD pipelines for automated testing, deployment, and monitoring. Work closely with core devops teams or independently handle infrastructure and deployment ...

Backend / AI Application Engineer

Hiring Organisation
OxSci
Location
London Area, United Kingdom
Build the backend for our core product services and AI-powered features, using Python/FastAPI to ship stable, scalable systems. Design and implement model calls, retrieval-augmented generation (RAG), context engineering, tool calling, and workflow orchestration across use cases spanning academic-content understanding, workflow assistance, output generation … product, frontend, and platform teams to take new features from validation to production, continuously improving quality, latency, stability, and cost. Contribute to the design of data structures, knowledge-base interfaces, evaluation mechanisms, and service governance to keep the overall system maintainable. What we're looking for A solid backend ...

Principal Artificial Intelligence (AI) Platform Engineer/Architect

Hiring Organisation
WTW
Location
Greater London, United Kingdom
Employment Type
Full Time
their development workflows safely and seamlessly. Acting as both architect and hands-on builder, you will articulate our vision for AI-accelerated development practices, design platforms that embed AI at every phase of the SDLC, and champion adoption across our organization. We are seeking a highly skilled engineer … model) The Role Define and evolve the vision for AI-enabled SDLC practices, translating business and technical strategy into concrete platform capabilities and processes Design and implement scalable AI platform infrastructure (SDKs, frameworks, deployment pipelines) that enables rapid, safe integration of AI into all phases of development—from coding ...

Product Management - Private markets, Charles River Development, Assistant Vice President

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
deliver the roadmap for horizontal platform capabilities serving all private markets asset classes - including core data services, cross-fund analytics, workflow automation, and API infrastructure. Lead initiatives in AI/ML-enabled product features, including document extraction (e.g., fund documents, LP agreements, investment memos), NLP-powered search, and intelligent … reporting cycles. Demonstrated experience owning platform-level or infrastructure product workstreams with high technical complexity. Familiarity with data architecture concepts: data modeling, ETL pipelines, API design, and event-driven systems. Experience with agile development methodologies; strong proficiency with product management tools (Jira, Confluence, Productboard, or similar). Exceptional ...

Integration Developer FTC

Hiring Organisation
itecopeople
Location
London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£60,000
using modern cloud-native and streaming technologies. Key Responsibilities Develop event-driven integrations and backend services Build connectors, event-processing services, and data pipelines Design scalable integration patterns, schemas, and event flows Develop CDC pipelines and resilient messaging solutions Improve observability through logging, metrics, and tracing Deploy containerised services … Grafana Required Skills Strong software engineering background Experience building integration or event-driven platforms Kafka, Redpanda, or similar streaming technologies Enterprise system integrations and API design Agile development experience Strong communication and collaboration skills Desirable Skills Go and/or Python CDC pipeline development Azure cloud experience Observability ...

AI Platform/ DevOps Engineer

Hiring Organisation
The Portfolio Group
Location
City of London, London, Castle Baynard, United Kingdom
Employment Type
Permanent
Salary
£70000 - £80000/annum + Benefits
secure, and cost-efficient platform infrastructure that enables AI engineering teams to ship and operate AI products reliably in production. What you'll do Design, build, and operate cloud-native AI platform infrastructure across AWS (Lambda, API Gateway, DynamoDB, S3, CloudWatch) and Databricks Deploy and operate containerised services … workflows, and RAG components Implement observability across AI workloads using CloudWatch, MLflow, and OpenTelemetry - covering latency, throughput, cost, and system health Apply secure-by-design principles including IAM, encryption, network controls, and audit logging Work closely with AI engineers to translate prototypes and proof-of-concepts into production-ready ...

Senior Application Security Engineer - DevSecOps & Cloud Security

Hiring Organisation
Additional Resources
Location
London, United Kingdom
Employment Type
Permanent
Salary
£70000 - £80000/annum
applications, platforms and deployment processes. This is not a traditional vulnerability management role, it is a hands-on Application Security role centred on secure design, CI/CD security, cloud-native technologies, Kubernetes, API security, code analysis, security-as-code and supporting development teams to build secure applications. … controls throughout CI/CD pipelines. Strengthening the security of GitHub Actions and comparable continuous integration and deployment platforms. Providing technical guidance on secure API design and protecting externally accessible systems. Supporting the security of Azure cloud infrastructure, including Azure Kubernetes Service (AKS). Assisting with the protection ...

Senior Full Stack Engineer

Hiring Organisation
Ocean Orchestra
Location
London, United Kingdom
real customers and users across the world. What You’ll Do Own our engineering stack from MVP to scale — backend, frontend, infra . Design architecture, choose tools, and set engineering standards. Work directly with early users to iterate quickly. Collaborate with the founding team on strategy, hiring, and scaling … high-quality, user-focused features (that change Oceans and planet) fast. What We’re Looking For 5+ years of backend expertise in Go including API design, microservices architecture, gRPC/REST services, and database design (PostgreSQL, Redis). Frontend proficiency with React/Next.js, responsive design ...

Senior Solutions Engineer

Hiring Organisation
Wise
Location
Greater London, United Kingdom
Employment Type
Full Time
Salary
87500 to 111000 GBP Annually
team works with top tier global financial institutions and major tech companies to offer Wise products and services directly to their customers. Through our API, we help partners to architect and build integrations to our world class-leading international finance products, which in turn improves Wise Platform by increasing … improve turnaround times. Designing and developing innovative new features that expand the functionality of Wise's services and exposing these features through the public API, enabling seamless integration with partner systems and empowering them to leverage the full potential of Wise's platform. Diagnosing and resolving complex technical issues ...

Engineering Lead, Scale

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
foundational systems that power our embedded finance platform at global scale. The team owns multi‐tenant infrastructure, drives cross‐domain product capabilities, and helps design technical solutions for enterprise customers. Key areas of ownership include: Embedded Finance Platform: Build and maintain the infrastructure powering customers like Rippling, Navan, Qantas … career development. Set technical direction for scalable, reliable backend systems and partner with senior engineers on architecture and design. Ensure high standards for system design, code quality, testing, and operational excellence. Drive improvements across reliability, observability, security, and developer productivity. Work cross‐functionally with product, design, compliance, sales ...

Dell Boomi Integration Consultant

Hiring Organisation
Oscar Associates (UK) Limited
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £550 per day
Boomi AtomSphere, connecting multiple enterprise platforms across cloud and on-premise environments. This is a hands-on technical position requiring strong Boomi development experience, API integration knowledge and the ability to support complex integration landscapes. Key Responsibilities: Design and develop scalable integration solutions using Dell Boomi AtomSphere, including … secure Managed File Transfer (MFT) workflows to support high-volume and sensitive data transfers Publish, secure and govern REST/SOAP APIs through Boomi API Management, including gateway configuration, throttling and developer portal management Develop and maintain CI/CD pipelines using Git, Azure DevOps or Jenkins, supporting automated ...

Mulesoft Developer - Fully Remote

Hiring Organisation
Square One Resources
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP 315 Daily
exciting opportunity now available with one of our sector-leading retail clients! They are currently looking for a highly skilled MuleSoft Developer to design, build, and deliver MuleSoft APIs for a complex retail and E-commerce implementation. The role involves hands on development, and design experience within … agile, multi squad environment Job Responsibilities/Objectives Design, develop, test, and maintain MuleSoft APIs and integrations aligned to an API-led connectivity approach (Experience, Process, and System layers). Build and expose RESTful and SOAP APIs in compliance with agreed interface contracts and enterprise API design ...

Full Stack Developer

Hiring Organisation
Robert Half
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
Salary negotiable
this is an opportunity to help shape the future of a rapidly evolving platform. Role The Full Stack Developer will contribute to full-stack design and development across the platform. Design, develop, and maintain both front-end user interfaces and back-end services, APIs, and databases. Monitor platform … strong focus on backend development. Bachelor's or Master's degree in Computer Science, Engineering, or a related discipline. Strong understanding of database design, data modelling, and optimisation, particularly using SQL. Hands-on experience working with Google Cloud Platform (GCP) services. Experience monitoring production systems, triaging issues, and distinguishing ...

Tech Lead / Senior Software Engineer / Software Architect

Hiring Organisation
Intec Select Ltd
Location
London, Portsoken, United Kingdom
Employment Type
Permanent
Salary
£80000 - £110000/annum
Tech Lead, Senior Software Engineer or Software Architect who enjoys solving complex technical problems and building modern, scalable software. Role & Responsibilities Lead the technical design and evolution of a large-scale business-critical platform. Improve the existing architecture and define a pragmatic roadmap towards a modern, scalable solution. Design … powered capabilities into the product to improve functionality and user experience. Drive the adoption of AI-assisted software development tools and engineering best practices. Design integrations with enterprise platforms, APIs and wider business systems. Work closely with Product, Architecture and Engineering teams to deliver incremental improvements. Mentor developers ...

Manager - Lead AI Engineer

Hiring Organisation
Anson Mccade
Location
City of London, London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£70,000
building and knowledge-sharing initiatives Skills & Experience Required Significant senior backend development experience with strong Python proficiency (async programming, concurrency, multithreading) Expertise in RESTful API design, OpenAPI/Swagger documentation and API lifecycle best practices Hands-on experience with ML libraries: PyTorch, PySpark, scikit-learn, Hugging Face … machine learning, cloud computing or data engineering highly advantageous Professional accounting qualification desirable but not required Nice to Have Experience with Microsoft Graph API Background in audit, financial services or regulated industry technology What's on Offer A competitive salary and benefits package, flexible hybrid working across 20+ ...

iOS Software Engineer II

Hiring Organisation
Entrust
Location
City of London, London, United Kingdom
your field and build new products and expend on existing products while working with the team to further improve our SDK document capture experience Design and deliver solutions that will scale with significant volumes, be highly available, performant and resilient. We’re on a rapid growth trajectory and have … designers, product managers, and other engineers to deliver great experiences to our customers and their users, leveraging your strong understanding of the iOS SDK, API design and mobile engineering good practice. Working within the team, prototype and iterate until the solutions are impactful and well-polished, supporting multiple ...

Software Engineer C#, React, .NET

Hiring Organisation
RX Global
Location
Greater London, United Kingdom
Employment Type
Full Time
.NET/C#,, NET Core and familiarity with SQL or data skills Proficiency in Front end tech stack React or Angular Understanding of system design, domain modelling, and API design principles Experience writing unit and integration tests and working with CI/CD pipelines Exposure to cloud ...

Senior C# Engineer - AI Native & Agentic Engineering, AWS, Lambda, SQS

Hiring Organisation
Smart Sourcer Limited
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
From £700 to £800 per day OUTSIDE IR35
.NET 8/9 , with the ability to architect and lead distributed REST microservices. Strong authority across AWS serverless Lambda-first thinking, plus API Gateway, SQS, Step Functions, EventBridge and IAM. Hands-on experience with Claude Code (or similar) and agentic engineering: multi-agent orchestration, context management, custom skills … scaling AI-assisted delivery. Deep data expertise across Aurora MySQL and DynamoDB schema design, access patterns, indexing, tuning and pragmatic trade-offs. Proven experience designing event-driven systems with SQS: idempotency, retries, ordering, DLQs and operational resilience. Strong API design sensibility: versioning, documentation, throttling, backwards compatibility ...

Senior Full Stack Engineer

Hiring Organisation
Humanoid
Location
London Area, United Kingdom
create the world’s leading, commercially scalable, safe, and advanced humanoid robots that seamlessly integrate into daily life and amplify human capacity. Responsibilities Design and implement a centralized cloud-based platform for managing a fleet of humanoid robots, monitoring system health, and visualizing fleet-level KPIs Develop robust backend … Expertise Proficiency in one of Python, Javascript, Golang or Rust Familiarity with React (or similar frameworks) for creating user-friendly web applications. Expertise in API design, data modeling, and distributed architectures Proficiency with CI/CD pipelines, containerization (e.g., Docker, Kubernetes), and workflow automation. Proficiency in infrastructure ...

Director, Forward Deployed Engineering

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
lead a team of elite engineers who embed directly with Fortune 500 customers to ship deeply integrated AI agents—owning everything from agent design and evaluation to the backend services, data systems, and cloud infrastructure that make them production‐ready. You'll partner closely with our Forward Deployed … volume for senior engineering roles. Hands‐on fluency with the full AI stack. Deep familiarity with LLMs and agent systems, evaluation frameworks, backend and API design (Python or TypeScript), data systems (PostgreSQL, DynamoDB, MongoDB, or similar), and cloud infrastructure (AWS, Azure, or GCP) including Kubernetes, Docker ...

Full Stack Engineer

Hiring Organisation
Hotspex
Location
London, England, United Kingdom
enterprise-grade emotional brand science into the hands of every marketer → MCP server integrations and agentic tool chains — exposing our Human Motivation Framework as API-accessible AI tools that plug into Claude, Adobe, and enterprise martech stacks → Client-facing interactive products — brand simulators, revenue growth models, and AI-powered … Qualifications Proficient in front-end development: HTML, CSS, and modern JavaScript frameworks (React preferred) Skilled in back-end development: server-side languages, database management, API design Proven full-stack delivery — end-to-end ownership from architecture to deployment Strong experience with Claude Code — show us what ...

Back End Development Lead

Hiring Organisation
Oyster Consultants
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£60,000 - £75,000 per annum
evolve our stack and make constant improvements. Required Skills/Experience Strong C# development experience Experience with both .NET Core and .NET Web API Experience of building Microservices in .Net Core Experience using Message Based Architectures Experience using both SQL & NoSQL technologies Experience of API design Cloud ...