201 to 225 of 346 API Design Jobs in England

Software Development Engineer III

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
technical leadership by designing shared GenAI capabilities, supporting live systems and raising engineering and AI delivery standards across the team through mentoring and rigorous design practice. Data & AI Product Development: Take ideas from discovery through rapid prototypes to production grade solutions that combine data, user facing applications and backend … services. Work closely with product managers, designers, data science and engineering teams to translate business needs into well designed technical solutions. Design and deliver LLM based applications and AI agents that enable intelligent decision making and automation, applying pragmatic engineering patterns and appropriate guardrails. Design and consume APIs ...

Senior Java Backend Engineer - Leeds-Based

Hiring Organisation
Jobleads-UK
Location
Leeds, England, United Kingdom
distributed video recording systems and advanced reporting/analytics applications. In this role, you will be deeply involved in hands‐on development, architectural design, and cross‐studio collaboration to advance our internal ecosystem. Key Responsibilities Design & Implementation: Architect and develop robust backend solutions to meet the fast‐paced … challenges of global game development. Technical Leadership: Contribute to the team’s software design guidelines, coding standards, and architectural blueprints. Global Collaboration: Partner and collaborate with other Rockstar technology teams across our worldwide studios. Continuous Innovation: Develop a deep understanding of existing systems while researching and adopting new technologies ...

Net Developer

Hiring Organisation
Pontoon
Location
Bromley, London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - £750/day
Develop and maintain high-quality software applications using .NET (4.5+/.NET Core) and Python. Collaborate with cross-functional teams to gather requirements and design effective solutions. Provide support to team members and stakeholders to ensure smooth project execution. Liaise with technical and business colleagues to understand functional requirements … deliver solutions that align with business objectives. Utilise your understanding of Web Services (REST, SOAP) to design and document APIs effectively. Work with MS SQL Server, including TSQL, SSIS, SSRS for database management and reporting. Utilise version control tools such as Git/Bitbucket and job scheduling tools like ...

AI Infrastructure Engineer, Sandbox Platform

Hiring Organisation
Scale AI
Location
London, UK
teams to understand how they use the platform, debug their issues, and shape a roadmap that balances immediate needs with long-term architecture.You will:Design and build the sandboxing platform, client library, and API surface for secure code execution across containerized and virtualized environmentsEnsure strong isolation, security … maintain a product roadmap for sandboxing, balancing immediate needs against long-term architectural investmentLead architecture reviews and own projects end-to-end, from design through deployment, in fast-paced cross-functional settingsIdeally you'd have:4+ years of experience building high-performance systems software, with meaningful time spent maintaining ...

AI Infrastructure Engineer, Sandbox Platform Scale AI London, UK

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
understand how they use the platform, debug their issues, and shape a roadmap that balances immediate needs with long-term architecture. You will: Design and build the sandboxing platform, client library, and API surface for secure code execution across containerized and virtualized environments Ensure strong isolation, security … maintain a product roadmap for sandboxing, balancing immediate needs against long-term architectural investment Lead architecture reviews and own projects end-to-end, from design through deployment, in fast-paced cross-functional settings Ideally you'd have: 4+ years of experience building high-performance systems software, with meaningful time ...

Development Manager - Digital Platform & API

Hiring Organisation
Morgan McKinley (South West)
Location
Epsom, Surrey, United Kingdom
Employment Type
Permanent
Development Manager - Digital Platform & API Location: Epsom, Surrey (Hybrid - 2 days office/3 days work from home) Position Overview Are you an agile digital delivery specialist looking to shape the future of platform services across a progressive business? We are seeking a Development Manager - Digital Platform & API … high-value transformation projects with continuous operational BAU demands. Key Responsibilities Product Ownership & Strategy: Lead the roadmap, product backlog, and feature prioritization for our API integration layer and a suite of around 20 application platforms, including flagship digital finance tools. Outsourced Delivery & Vendor Management: Direct external software providers ...

Machine Learning Engineer

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
pipelines using Python and common ML and DL libraries (e.g. Pytorch, Tensorflow) from early conceptualisation to full deployment in scalable production environments Ability to design, deploy and maintain ML solutions on modern frameworks to meet functional business requirements, adhering to software engineering best practices and with exposure to version … control, testing, MLOps, CI/CD and API design Hands on experience in using one of 3 major cloud technologies (AWS, Azure or GCP) in a production environment, as well as ML platforms (AWS Sagemaker, Azure Machine Learning studio) Be a ‘lifelong learner’ and can demonstrate a drive ...

Lead Software Engineer

Hiring Organisation
Investcloud
Location
London, UK
early stage of the build and looking for Lead Software Engineers to partner closely with the VP of Engineering to design and deliver foundational capabilities. This is a hands-on role for someone who wants to help shape the architecture, standards, and engineering culture of a new platform while … leveraging modern coding practices to deliver high-quality code and infrastructure. How you will provide meaningful contributions: Design and build backend services for the platform, primarily in Go, running on AWS with Postgres as a core data store. Own features and services end-to-end: from shaping requirements ...

Senior Software Engineer – Data Visualisation & Graphics | London

Hiring Organisation
techstack Recruitment
Location
City of London, London, United Kingdom
working on the underlying systems that make complex visualisations fast, accurate, and scalable. The challenges range from rendering performance and interaction design through to algorithms, graphics, API design, and numerical correctness. What you’ll be doing Designing and building core charting features used by developers around … exceptionally high technical standards High levels of ownership and autonomy Small team, significant impact Opportunity to deepen expertise in performance, graphics, visualisation, and systems design Package Salary up to £200,000 Hybrid working (London) Private healthcare Pension Additional benefits If you’re interested in building the technology behind modern ...

Technical Architect - Pre-sales

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
client data will be sourced, validated, and integrated into Mondra, leveraging where possible our existing Import and Export APIs and identifying where custom API development may be required for fulfil Mondra’s data requirements. You will also contribute to the client contracting process, ensuring technical commitments are clearly defined … including mapping data sources, transformation logic, and validation processes. Identify the client’s BI requirements, and define data export strategies (preferably via existing Mondra API). Identify the authentication/authorisation capabilities of the client, and promote the integration with Mondra’s Identity Provider via Single Sign On. Leverage ...

Senior Software Engineering Manager (Active Savings)

Hiring Organisation
Jobleads-UK
Location
Bristol, England, United Kingdom
Strong engineering background with the ability to communicate architectural decisions to both technical and non-technical stakeholders. You create guardrails based on scope, technical design, NFRs, and quality—then empower your team to innovate within them. Client- and product-focused mindset, with experience partnering closely with Product Managers … business teams. You embrace ambiguity, foster collaboration, and promote psychological safety to help teams navigate change. Hands-on knowledge of secure API design, authentication services, and mobile development (Swift/Kotlin, React Native). Knowledge and experience of modern DevOps tools and practices. Exposure to Figma and Vercel ...

Senior Software Engineering Manager (Active Savings)

Hiring Organisation
Jobleads-UK
Location
West of England, England, United Kingdom
Strong engineering background with the ability to communicate architectural decisions to both technical and non-technical stakeholders.* You create guardrails based on scope, technical design, NFRs, and quality—then empower your team to innovate within them.* Client- and product-focused mindset, with experience partnering closely with Product Managers … business teams.* You embrace ambiguity, foster collaboration, and promote psychological safety to help teams navigate change.* Hands-on knowledge of secure API design, authentication services, and mobile development (Swift/Kotlin, React Native).* Knowledge and experience of modern DevOps tools and practices.* Exposure to Figma and Vercel ...

Senior Backend Engineer II

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
Senior Backend Engineer (II) to join our Special Projects Team, the team responsible for building Runna features directly inside the Strava app. You'll design and build the services that let Strava athletes experience Runna's structure training and workout analysis natively within Strava. This is a rare chance … that translates to more than half of your time on-site in our London office — three days per week. What You’ll Be Doing: Design, build, and maintain scalable backend services using Strava’s tech stack (Ruby, Java, Scala, Python, Go, MySQL, Redis, Cassandra, Kafka, Kubernetes, Docker, Elasticsearch ...

Senior Oracle Technical Consultant – DV cleared

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
clearance for an initial 3 month contract, 2-3 days on site in London per week, paying £550/day outside IR35 – to design, build, and manage integrations across Oracle SaaS modules (ERP, HCM, SCM) using Oracle Integration Cloud (OIC). The ideal candidate combines strong technical integration skills … business requirements with technical delivery. Working knowledge of Oracle PaaS and IaaS is essential to support end‐to‐end cloud integration architectures. Key Responsibilities Design, develop, and deploy integrations across Oracle Fusion ERP, HCM, and SCM modules using Oracle Integration Cloud (OIC). Build and maintain integrations using ...

Senior .NET Developer (Previous WinForms)

Hiring Organisation
Avanti
Location
Exeter, Devon, England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £75,000 per annum
must already have commercial experience working this way. You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions. You'll work closely with the CTO, Head of Engineering and the original software author, gaining a deep understanding … Previous meaningful experience with WinForms Commercial TDD – Test first (Red/Green/Refactor) Strong automated testing Experience contributing to technical decisions and software design Ownership/modernisation of existing applications If you've previously worked with WinForms but have since moved into modern .NET, APIs or cloud development ...

Senior .NET Developer (Previous WinForms)

Hiring Organisation
Avanti
Location
Peterborough, Cambridgeshire, England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £75,000 per annum
must already have commercial experience working this way. You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions. You'll work closely with the CTO, Head of Engineering and the original software author, gaining a deep understanding … Previous meaningful experience with WinForms Commercial TDD – Test first (Red/Green/Refactor) Strong automated testing Experience contributing to technical decisions and software design Ownership/modernisation of existing applications If you've previously worked with WinForms but have since moved into modern .NET, APIs or cloud development ...

Senior .NET Developer (previous WinForms experience)

Hiring Organisation
Avanti
Location
Blackpool, Lancashire, England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £75,000 per annum
must already have commercial experience working this way. You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions. You'll work closely with the CTO, Head of Engineering and the original software author, gaining a deep understanding … Previous meaningful experience with WinForms Commercial TDD – Test first (Red/Green/Refactor) Strong automated testing Experience contributing to technical decisions and software design Ownership/modernisation of existing applications If you've previously worked with WinForms but have since moved into modern .NET, APIs or cloud development ...

Senior .NET Developer (Previous WinForms)

Hiring Organisation
Avanti
Location
Sheffield, South Yorkshire, England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £75,000 per annum
must already have commercial experience working this way. You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions. You'll work closely with the CTO, Head of Engineering and the original software author, gaining a deep understanding … Previous meaningful experience with WinForms Commercial TDD – Test first (Red/Green/Refactor) Strong automated testing Experience contributing to technical decisions and software design Ownership/modernisation of existing applications If you've previously worked with WinForms but have since moved into modern .NET, APIs or cloud development ...

Senior .NET Developer

Hiring Organisation
Avanti
Location
Newcastle Upon Tyne, Tyne and Wear, England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £75,000 per annum
must already have commercial experience working this way. You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions. You'll work closely with the CTO, Head of Engineering and the original software author, gaining a deep understanding … Previous meaningful experience with WinForms Commercial TDD – Test first (Red/Green/Refactor) Strong automated testing Experience contributing to technical decisions and software design Ownership/modernisation of existing applications If you've previously worked with WinForms but have since moved into modern .NET, APIs or cloud development ...

Head of AI Labs Data Acquisition

Hiring Organisation
Nomura
Location
London, UK
with strategic leadership capabilities to deliver robust, scalable data solutions that support our organization's analytical and operational requirements.Responsibilities:Lead the end-to-end design, development, and maintenance of our enterprise-grade Data Lake platform, with particular emphasis on optimizing data ingestion workflows and acquisition methodologiesCollaborate closely across various … health and lineageEstablish and maintain documentation standards, best practices, and governance frameworks for data acquisition and quality assurance processesLead architectural discussions and to technical design decisionsSkills, experience, qualifications and knowledge required:Experience: Experienced Java Software Engineer with extensive professional development experience and a proven track record of delivering enterprise ...

Private Cloud Principal Engineer

Hiring Organisation
Hays Technology
Location
Sheffield, South Yorkshire, United Kingdom
Employment Type
Contract
Contract Rate
£700/day 700 p/d
architectures and platform guardrails Act as a senior technical authority, reviewing designs and ensuring solutions are secure, scalable, supportable and cost-effective Lead the design and evolution of platform capabilities spanning compute, storage, networking, orchestration and platform services Work closely with Product Owners and Architects to translate strategic objectives … Establish standards for event streaming, resiliency, monitoring and governance Support engineering teams in adopting event-driven architectures and microservices patterns Drive best practice around API design, domain boundaries and service resilience Improve developer productivity through self-service capabilities, reusable templates and engineering standards E ngineering Leadership Mentor engineering ...

Senior Product Security Engineer

Hiring Organisation
Jobleads-UK
Location
Cambridge, England, United Kingdom
them at scale. You will work on tool integration, results processing, and the services that make analysis outputs usable by engineering teams. Key Responsibilities Design, build, and maintain core backend services for centralised security analysis and data processing. Develop Python services, APIs, and workflow components that support tool onboarding … comfortable in scripting (e.g. bash). Proven experience designing, building, and operating backend services or internal platforms in production environments. Strong understanding of API design, service-to-service integration, and backend architecture. Experience working in cloud environments, ideally AWS. Experience with containers and related tooling, for example Docker. ...

Senior Product Engineer - Partner Experience

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
ones.How we work:We're a small team that ships frequently and iterates on real partner feedback. Engineers own features from technical discovery and design through to production support. We work closely with our PM and designer to understand partner needs, and with adjacent teams (API Experience, Account … identity mapping between partner systems and Wise.• The communication layer services between Wise and partners, extending them to handle new case types and workflows.• API design for partner-facing endpoints. We care about consistency, documentation, and making them usable without hand-holding.• Work with FinCrime, Compliance ...

Senior Software Engineer (Python)

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
team that’s making a real difference. The role What you’d be doing? You’ll collaborate with cross‐functional teams to design and implement software solutions that address complex sustainability challenges. Your focus will be on building internal tooling that consultants use to deliver these insights to clients. … have a track record of delivering production software systems that incorporate various data backends, query languages, and ORM frameworks. Your expertise should include API design, web application development, and a background in data engineering, particularly with ETL pipelines. While not mandatory, experience with modern cloud technologies and platforms ...

Senior Full Stack Developer | C#.NET, React | London

Hiring Organisation
Source Group International
Location
London, UK
contributing to architecture, delivery, and continuous improvement. This is a hands-on role with strong influence over engineering standards, quality, and technical direction.Key Responsibilities Design, develop, test, and maintain scalable services using C#/.NET (ASP.NET Core) and RESTful APIs.Build responsive, accessible user interfaces using React, TypeScript, HTML … OAuth2/OIDC) and follow secure coding practices.Optimise performance, reliability, and observability (logging, metrics, tracing).Work with relational databases (e.g., SQL Server) including schema design, queries, and tuning.Write automated tests (unit, integration, end-to-end) and participate in code reviews.Collaborate with product, design, and stakeholders to refine requirements ...