51 to 75 of 156 API Design Jobs in England

Software Engineer III (UI) - Digital Markets Execution Technology (DMET), Execute

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Full-time
this role. \n JOB DESCRIPTION \n As a Software Engineer III at JPMorganChase, you serve as a seasoned member of an agile team to design and deliver trusted market-leading technology products in a secure, stable, and scalable way. You are responsible for carrying out critical technology solutions across … measured by resiliency, usability, and speed of delivery in a highly operational, business-critical environment. \n Job Responsibilities\n \n Executes software solutions, design, development, and technical troubleshooting with ability to think beyond routine or conventional approaches to build solutions or breakdown technical problems \n Creates secure and high ...

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 ...

Lead Software Engineer - Sdet

Hiring Organisation
J.P. Morgan
Location
London, United Kingdom
advance your career while helping us deliver exceptional solutions.\ NAs a Lead Software Development Engineer in Test (SDET) in our technology team, you will design, build, and support automated testing frameworks for backend applications. You will collaborate closely with developers and engineers to ensure robust, scalable, and reliable systems. … NJob Responsibilities:\ N\nDesign and support automated testing frameworks for backend applications\ NDevelop and maintaintest scripts using Python3 and pytest\ NImplement and validate REST API functionality and principles\ NDrives team adoptionof enterprise-authorized AI-assisted engineering practices within the work environment to improve code quality, delivery speed, and operational ...

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 ...

Integration Architect - INSIDE IR35 - HYBRID

Hiring Organisation
Proactive Appointments
Location
Surrey, England, United Kingdom
Employment Type
Contractor
Contract Rate
£450 - £470 per day
Integration Architect - INSIDE IR35 - HYBRID Integration Architect Ready to shape enterprise integration at scale? We're looking for an experienced Integration Architect to design secure, scalable, and innovative integration solutions across cloud, on-premises, and hybrid environments. You'll lead API strategy, middleware architecture, event-driven integration … cloud connectivity while working with cutting-edge technologies including Azure, AWS, Kafka, MuleSoft, Boomi, and API Management platforms. If you're passionate about solving complex integration challenges, influencing enterprise architecture, and driving digital transformation, we'd love to hear from you. Required Skills and Experience Strong experience in enterprise ...

Digital Senior Full Stack Engineer

Hiring Organisation
Leeds Building Society
Location
Leeds, West Yorkshire, Yorkshire, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£75,000
make a difference You'll take technical ownership of customer-facing solutions, working across React/TypeScript and .NET/C# to design, build, test and run reliable, secure and scalable services. You'll lead complex technical delivery, champion modern engineering practices and help shape high-quality solutions through … testing. CI/CD craftsmanship (Azure DevOps/GitHub Actions or similar) with quality gates and environment parity. Proven record designing scalable, resilient systems; API design/versioning; clean architecture and DDD experience. Track record mentoring engineers and leading code/design reviews; uplifting test automation ...

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 ...

Software Engineer - Android Developer

Hiring Organisation
Talent Locker
Location
Cheltenham, Gloucestershire, South West, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £530 per day
experience with: Android development (Kotlin, Jetpack Compose) Backend development (Rust, Python or Go) Git and modern development workflows Docker + CI/CD pipelines API design (REST/OpenAPI) Working in secure or controlled environments Nice to have: AWS or Azure experience Kubernetes Agile delivery experience Secure coding ...

Senior Ruby Engineer - £110K

Hiring Organisation
17918
Location
Reading, Berkshire, United Kingdom
fast-moving, product-centric environments. Key requirements: Ruby & Ruby on Rails Full-Stack Engineering: JavaScript, TypeScript, React, Hotwire, Stimulus Node.js & React exposure beneficial API Design: REST, GraphQL, external integrations Data Stores: PostgreSQL, MySQL, Redis, Elasticsearch Async Processing: Sidekiq, Resque Cloud & DevOps: AWS, Heroku, Docker, CI/CD pipelines … Testing & Quality: RSpec, Capybara, TDD methodologies Security, performance tuning, and system hardening AI & LLMs: API integration, prompt engineering, AI-enhanced features and developer tooling Responsibilities: Provides hands-on technical leadership to engineering teams (515 people), including mentoring, code review, and architectural direction. Owns end-to-end system architecture, ensuring ...

Mid-Level Full Stack Developer

Hiring Organisation
Orcha
Location
Warrington, Cheshire, United Kingdom
Employment Type
Permanent
Salary
£45000/annum
role: We're looking for an experienced Mid-Level Full Stack Developer to join our engineering team and play a significant role in the design, development, and delivery of our products. This role is ideal for someone at the upper end of mid-level, with strong commercial experience across … ready to take real ownership of their work. You will deliver features end to end with minimal supervision, contribute to technical and design decisions, and help raise standards across the team. The role combines hands-on development with a growing influence on how we build software. A key part ...

Software Engineer Iii (Ui) - Digital Markets Execution Technology (Dmet), Execute

Hiring Organisation
J.P. Morgan
Location
London, United Kingdom
professionals for this role.\ NJOB DESCRIPTION\ NAs a Software Engineer III at JPMorganChase, you serve as a seasoned member of an agile team to design and deliver trusted market-leading technology products in a secure, stable, and scalable way. You are responsible for carrying out critical technology solutions across … success will be measured by resiliency, usability, and speed of delivery in a highly operational, business-critical environment.\ NJob Responsibilities\n\ NExecutes software solutions, design, development, and technical troubleshooting with ability to think beyond routine or conventional approaches to build solutions or breakdown technical problems\ NCreates secure and high ...

Senior Software Developer

Hiring Organisation
Oscar Associates (UK) Limited
Location
Warrington, Cheshire, North West, United Kingdom
Employment Type
Permanent
Salary
£70,000
working with an exciting organisation that is looking to appoint a Senior Full Stack Developer to help design and deliver secure, cloud-native applications within a modern Microsoft and Azure ecosystem. This is an excellent opportunity for an experienced full-stack engineer who thrives in structured architectural environments … maintaining unit and frontend tests (NUnit and ViTest) Contributing to CI/CD pipeline improvements and secure deployment practices Participating in architecture and technical design reviews Ensuring all development aligns with OWASP security best practices Tech Stack & Environment Core technologies: .NET 10/ASP.NET Core Angular 21 (mandatory) DevExpress ...

Full Stack Developer

Hiring Organisation
Robert Half Limited
Location
London, United Kingdom
Employment Type
Contract, Work From Home
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 ...

Senior Python Backend Engineer Fully Remote, UK

Hiring Organisation
Interact Consulting Limited
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
enjoys building from the ground up. The salary range is up to £120,000 depending on experience and fit. Key Responsibilities Own the design, development, and operation of the core backend services that power our consumer-facing products and internal operational tooling. Build scalable, low-latency systems that … notification preferences, audience segmentation, and delivery tracking. Integrate with third-party data providers and external services, ensuring robust failure handling, observability, and system resilience. Design and support secure internal tooling APIs, including role-based access controls, audit trails, change history, and safe administrative workflows. Build and operate event-driven ...

Lead Developer

Hiring Organisation
Oscar Associates (UK) Limited
Location
Warrington, Cheshire, North West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£80,000
manual test strategies Documenting architectural decisions (ADRs) and maintaining clear technical communication Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (offline-first mobile design) Microsoft Azure (App Services, Azure SQL, Blob Storage, Key Vault, Application Insights … They're Looking For 7+ years' commercial software development experience At least 2 years in a leadership position Strong expertise in modern .NET and API design Proven Angular experience (v15+) Hands-on Azure architecture and deployment experience Strong understanding of CI/CD and enterprise DevOps practices Experience ...

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 ...

Senior Software Engineer

Hiring Organisation
Mattioli Woods
Location
Leicester, England, United Kingdom
help raise the standard for those around you. What you'll do Collaborate with BAs and product owners to refine and deliver the backlog Design, build and maintain software solutions following best practices Implement test automation and support end users on production defects Mentor junior team members and lead … activities What we're looking for C# .NET proficiency with full SDLC experience in a commercial environment Design patterns, SOLID principles and Agile methodologies Test automation (NUnit, xUnit, Playwright) and RESTful Web API design UI skills — JavaScript/jQuery, Bootstrap/Tailwind TSQL and C# ORMs (Entity ...

C# .Net Developer

Hiring Organisation
Pontoon
Location
Bromley, Kent, England, United Kingdom
Employment Type
Contractor
Contract Rate
£700 - £750 per day
Chicago). The role offers the opportunity to contribute to business-critical systems while working in a collaborative and supportive environment. Key Responsibilities Design, develop, enhance, and maintain enterprise applications using C# and .NET technologies. Support and improve existing business-critical systems, ensuring stability, performance, and scalability. Work closely … with business users, analysts, and technical teams to gather requirements and deliver solutions. Participate in the full software development lifecycle, including design, development, testing, deployment, and support. Collaborate with globally distributed development teams across multiple locations and time zones. Contribute to technical discussions, solution design, code reviews ...

C# .NET Developer

Hiring Organisation
Pontoon
Location
Bromley, London, South Yorkshire, United Kingdom
Employment Type
Contract
Contract Rate
£650 - £750/day Inside IR35
Chicago). The role offers the opportunity to contribute to business-critical systems while working in a collaborative and supportive environment. Key Responsibilities Design, develop, enhance, and maintain enterprise applications using C# and .NET technologies. Support and improve existing business-critical systems, ensuring stability, performance, and scalability. Work closely … with business users, analysts, and technical teams to gather requirements and deliver solutions. Participate in the full software development lifecycle, including design, development, testing, deployment, and support. Collaborate with globally distributed development teams across multiple locations and time zones. Contribute to technical discussions, solution design, code reviews ...

Software Engineer III

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 ...

UI Senior Lead Software Engineer - Commodities

Hiring Organisation
J.P. MORGAN
Location
St James, Bristol, UK
Employment Type
Full-time
inclusive team culture. This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. Job Responsibilities Lead the design and delivery of user interface capabilities across Execute, from discovery to production support Set front-end technical direction, including architecture, standards, performance, and testing … technical leadership in setting standards, leading designs, and directly managing or mentoring small teams of mid-level engineersSolid software engineering fundamentals, including OO/design patterns, debugging, and documentationFamiliarity with agentic development approaches across the software development lifecycleStrong communication and people skills, with the ability to work effectively ...

UI Senior Lead Software Engineer - Commodities

Hiring Organisation
J.P. Morgan
Location
London, UK
Employment Type
Full-time
This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. \n Job Responsibilities \n \n Lead the design and delivery of user interface capabilities across Execute, from discovery to production support \n Set front-end technical direction, including architecture, standards, performance … setting standards, leading designs, and directly managing or mentoring small teams of mid-level engineers \n Solid software engineering fundamentals, including OO/design patterns, debugging, and documentation \n Familiarity with agentic development approaches across the software development lifecycle \n Strong communication and people skills, with the ability ...

Senior Backend Python Engineer

Hiring Organisation
interAct Consulting Limited
Location
Milton Keynes, Buckinghamshire, England, United Kingdom
Employment Type
Full-Time
Salary
Salary negotiable
looking for: • Hands-on experience running real production workloads on AWS — not just deploying to it • Strong Postgres/SQL skills: schema design, query tuning, migrations • Solid API design chops: clear contracts, versioning, backwards compatibility • Python-first mindset (FastAPI or similar) • Redis experience: caching patterns, invalidation ...

Full Stack Developer

Hiring Organisation
Ashdown Group
Location
Manchester, North West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£60,000
work from home 1 day a week if desired. The salary on offer is £50,000-£62,000 DOE plus good benefits. Key Responsibilities Design, develop, and maintain scalable web applications using modern frameworks and technologies. Integrate Twilio APIs for voice, messaging, and video communication features. Collaborate with product … Twilio APIs (voice, SMS, video) and related integrations. Proven ability to build and work with real-time, event-driven systems. Solid grasp of RESTful API design and microservice architecture. Hands-on experience with AWS serverless technologies including DynamoDB, Lambda, and API Gateway. Familiarity with CI/ ...