19 of 19 Contract API Development Jobs in England

Senior Java Backend Developer - API & Microservices Modernisation Location: Telford - minimum 2 days per month onsite, remaining time remote Contract Length: 12 months Rate: £550 per day IR35: Inside IR35 Start Date: Candidates must be available to start w/c 4 January 2027 Client: Central Government The Role … Java-based RESTful APIs and microservices, with a strong focus on scalability, resilience, maintainability and integration with existing systems. Essential Skills Java - Strong backend development experience. Spring Boot - RESTful API and microservices development. Microservices Design - Experience designing scalable, resilient and loosely coupled microservices, including service-to-service communication. ...

though also like the idea of the equally important social/client-facing aspect of the role. The role is responsible for defining the development architecture across a blend of in-house bespoke solutions and 3rd party products and helping to shape the longer-term strategic development architecture … developing architecture strategy and target architecture model. You will be working closely with delivery team members to coach and promote best-practice solution development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority ...

building and enhancing modern applications, APIs, and cloud-native services, whilst mentoring developers and promoting engineering best practice. Key Responsibilities Lead the design and development of robust, scalable software solutions Drive technical decision-making and provide guidance to development teams Develop and maintain RESTful APIs and microservices Build … quality, automated testing, and CI/CD best practices Support deployment, containerisation, and platform optimisation activities Essential Skills & Experience Strong commercial experience with Node.js API development using REST and OpenAPI Web application development using HAPI Database expertise across PostgreSQL , MongoDB , and Redis Unit testing with Jest ...

operational teams, you'll help shape technical solutions while contributing to a culture of engineering excellence. You'll be involved in the full software development lifecycle, from architecture and design through to deployment and operational support, ensuring solutions are scalable, resilient and fit for purpose. Key responsibilities include: Designing … robust technical designs Contributing to software and system architecture decisions Building and supporting high-performing CI/CD pipelines and engineering practices Applying modern development standards, clean code principles and secure-by-design approaches Supporting testing, quality assurance and continuous improvement initiatives Collaborating with product managers, designers, security teams ...

stakeholder exposure and the opportunity to influence how AI is adopted across a prestigious financial services environment. Key Responsibilities Lead the technical design and development of AI-driven proof-of-concepts, prototypes and lightweight applications that demonstrate measurable business value. Work directly with senior stakeholders, business teams and technology … software engineering practices. Design and implement integrations across multiple enterprise data sources, systems and applications, establishing scalable and reusable engineering patterns. Leverage AI-assisted development tools, including GitHub Copilot, to accelerate engineering delivery and experimentation. Collaborate with platform engineering, architecture, security and governance teams to ensure solutions align with ...

modern web applications in an enterprise environment. Essential Skills Strong commercial experience with React TypeScript and modern JavaScript (ES6+) C#/.NET Core REST API development and integration HTML5, CSS3 and responsive UI development Git and Agile delivery practices Desirable Node.js Azure and/ ...

your peers on technical direction within your team Required experience Core Software Engineering such as: JavaScript frameworks (React, NextJS), TypeScript, Python or Java REST API development/OpenAPI/Swagger Cloud services (AWS or Azure) Containerisation & Orchestration (Docker, Kubernetes, OpenShift) Infrastructure as Code (Terraform, Ansible) Relational Databases (e.g. … working in an Agile delivery team We appreciate you may not be an expert in every area above - we can support with training and development in some areas! Please do make an application and we will identify where we can best support your growth specific to your application. Benefits ...

development. - Strong experience with modern JavaScript frameworks and responsive web application development. - Experience with Server Side programming languages, frameworks and service architecture. - Strong API development, microservices and Legacy system integration experience. - Experience with relational and non-relational databases. - Hands-on experience with Docker, Kubernetes and containerised applications. - Strong ...

throughput applications Low-latency engineering experience Strong analytical and mathematical problem-solving ability Experience with cloud platforms, ideally GCP Docker/containerisation experience REST API development experience Experience with event-driven architecture or messaging Exposure to AI, machine learning or AI-enabled systems Strong understanding of performance, reliability ...

Python specialist with a strong background in performance optimisation, near real-time systems and Kubernetes . Essential Skills & Experience: 10+ years of professional Python development experience Strong expertise in performance tuning , profiling and optimisation Experience developing low-latency, high-throughput systems Strong troubleshooting and root-cause analysis skills Experience … with event-driven and streaming architectures (Kafka, RabbitMQ, WebSockets) API development using FastAPI, Flask or Django Hands-on experience with Kubernetes and Docker Strong understanding of concurrency, asyncio, multiprocessing and threading Solid software architecture and design skills Experience with CI/CD pipelines, Git and Agile environments Desirable ...

Security Clearance (SC) is essential for this position. We are seeking a Mid Backend Engineer to join a delivery pod, contributing to the design, development and maintenance of scalable, resilient backend systems. The role will specialise in event-driven architecture and CQRS-based systems, working within a collaborative engineering … environment to deliver robust, distributed solutions. The successful candidate will have strong backend development experience, a solid understanding of architectural patterns and practical experience building event-driven applications. Key Responsibilities Design, develop and maintain backend services and applications within a pod-based delivery model. Implement and support systems built ...

working on multiple contract opportunities within leading financial services environments, spanning trading, risk and full-stack engineering. If you have extensive Python development experience and a background in high-performance trading or financial services environments, we'd love to hear from you. The opportunities We're looking for experienced … supporting trading workflows and financial markets. Risk Engineering: Building Back End services and distributed systems for risk data processing, analytics and reporting. Full-Stack Development: Building scalable applications across Back End services, APIs and Front End technologies. Financial Platforms: Improving business-critical systems, data processing pipelines and enterprise-grade ...

looking for an experienced Scala Developer to support critical government technology services and high-priority national infrastructure projects. Key skills required: Strong commercial Scala development experience Functional programming principles Microservices and API development Play Framework experience desirable Agile delivery and live service support If this Scala Developer ...

business, the role is 1 or 2 days per week in the office. Key technical requirements; Proven hands-on website, mobile app support and development experience (ideally Angular or Big Commerce) Proven hands-on API development or support experience ETL tools experience Hands-on Azure ADF, logic … function app, storage accounts development or support experience Hands-on Mobile middleware, IIS solution development, or support experience Experience in SSIS packages support, DB clustering set up, DB, SSIS upgrades, DB performance tuning. Experience in setting up monitoring and alerting using any monitoring tools e.g. spotlight, solarwinds etc. ...

combination of some of the following skills, then LETS TALK! Azure Logic Apps Standard Azure Functions Azure Service Bus Infrastructure as Code using Terraform API development and systems integration Strong troubleshooting and analytical skills Experience working with multiple stakeholders across business and technology teams Desirable: Knowledge of finance … environments Exposure to Agile and/or Waterfall delivery methodologies What's on Offer Exposure to modern Azure technologies and cloud platforms Ongoing professional development and training Hybrid working environment If you're passionate about Azure integration technologies and enjoy solving complex technical challenges in a collaborative environment ...

production-ready solutions using LLMs, AI agents and knowledge graphs. As our client employee in the UK, you'll have access to tailored professional development opportunities and a competitive pay and benefits package. This includes private healthcare for all UK-based employees, enhanced maternity and adoption pay and support … including production use of LLMs, AI agents, retrieval-augmented techniques and orchestration frameworks such as LangGraph or equivalent. Strong software engineering capability, particularly Python, API development, automated testing, version control, CI/CD and production observability. Proven technical leadership in complex enterprise environments, including technical design reviews, code ...

Back End services Maintain high code quality through testing, reviews and best practices Mentor junior developers where required Required Skills Strong Core Python development experience Experience with enterprise trading and risk platforms (eg Quartz, SecDB, Athena, Kanon, Beacon or similar) Strong SQL and large-scale data handling expertise Pandas … NumPy for data processing and analytics REST API development using Flask, FastAPI or Django Strong understanding of performance optimisation and scalable systems Unix/Linux and Shell Scripting experience Domain Experience Investment Banking or Capital Markets background Experience across Market Risk, CCR, PnL, Trade Lifecycle and Reconciliations Knowledge ...

/Boomi SME to join a team delivering and supporting business-critical integration solutions. This is a hands-on role focused on the design, development, maintenance, and support of integrations using the Boomi AtomSphere platform. You'll be responsible for building new integrations, supporting existing services, troubleshooting production issues … platforms. Troubleshoot integration failures, connectivity issues, and data flow problems. Analyse logs, alerts, and audit reports to identify and resolve issues. Support deployments across development, test, and production environments. Maintain integration documentation and operational procedures. Contribute to service improvements and platform optimisation initiatives. Desirable Skills Azure infrastructure and cloud ...

inclusion in the Company's hybrid work from home policy. Qualifications Proven experience with React and Go or C#. Solid understanding of web and API development. Strong SQL skills. Knowledge or experience with cloud platforms, specifically GCP. Interest in applying AI to the development lifecycle. Experience working … high-volume, fast-paced environments. A proactive approach to solving complex technical problems. Additional Information Owning development from requirement to go-live. Building and maintaining Golang microservices or React front-ends. Collaborating across sub-teams including Web, API, and Transactions. Contributing to our culture of technical expertise ...