31 back end developer jobs found

Methods Business and Digital Technology Limited Methods is a £100M+ IT Services Consultancy who has partnered with a range of central government departments and agencies to transform the way the public sector operates in the UK. Established over 30 years ago and UK-based, we apply our skills in transformation, delivery, and collaboration from across the Methods Group, to create end-to-end business and technical solutions that are people-centred, safe, and designed for the future. Our human touch sets us apart from other consultancies, system integrators and software houses - with people, technology, and data at the heart of who we are, we believe in creating value and sustainability through everything we do for our clients, staff, communities, and the planet. We support our clients in the success of their projects while working collaboratively to share skill sets and solve problems. At Methods we have fun while working hard; we are not afraid of making mistakes and...

The Role Are you a senior backend engineer who thrives on distributed systems, clean architecture, and complex data problems? At ONYX Insight, we're looking for a Senior Software Developer (Contractor) to make an immediate impact on our core platform, a sophisticated distributed system processing data from wind turbines around the world. This is not a typical SaaS CRUD role. You'll work across a distributed architecture including asynchronous messaging, worker processes, and data ingestion pipelines. Frontend exposure is a bonus, not a requirement. Key Responsibilities: Backend Delivery: Implement robust, well-tested C# .NET services following clean architecture principles — domain logic, data access, messaging, and background processing. Distributed Systems: Contribute to service boundary design, asynchronous messaging flows, and worker processes within our modular monolith, with an eye on future decomposition. Data Pipelines:...

The Role Are you a highly skilled full stack contractor looking to make an immediate impact on a modern, high-visibility platform? At ONYX Insight, we're looking for a Senior Software Contractor to join our team, with a primary focus on backend delivery using C# .NET, alongside contributing to our React frontend services. This is a hands-on contract role where you'll be trusted to hit the ground running, deliver high-quality code, and contribute to the evolution of our core platforms supporting the renewable energy sector. You'll work closely with product, design, and engineering teams to build scalable, performant user interfaces, while also supporting backend integrations where needed. Key Responsibilities: Deliver High-Impact Backend Solutions : Own the development of responsive, high-performance applications using C# .NET (primary focus). Full-Stack Contribution: Support frontend development with React (secondary focus), ensuring seamless...

We are recruiting for a Contract Software Development Manager for a duration of initially 6 months. This role is an immediate start. Who We Are: AND Digital are a tech company focused on accelerating digital delivery and dedicated to closing the digital skills gap. We've been helping organisations build better digital products and stronger digital teams since 2014. We believe our work should always make a remarkable impact for our clients. We do this through our regional offices (or 'Clubs') building strong relationships with our partners, so that they are always prioritised by a team within close proximity. This unique model has driven success for our clients and ourselves, evidenced by our remarkable organic growth since 2014. Today we number more than 1,300 people with Clubs all over the UK, Europe and the USA with plans for global expansion in the next couple of years. Join us - and help us fulfil our mission to close the world's digital skills gap. The Role:...

Company Description At Data Intellect , we thrive on solving complex data challenges in high-stakes environments. We’re a team of engineers, problem-solvers, and collaborators who believe in pushing boundaries, not egos. If you're a seasoned C++ Developer ready to lead, innovate, and make an impact, we want to hear from you. Job Description As a C++ Developer at [DI], you will focus on developing Front Office Trading software, primarily working within the market data development teams. You will gain exposure to the full software stack, using modern development tools and concepts to deliver high quality, best practice software solutions. This will involve working on the end-to-end development of low latency software components written in C++. Project responsibilities will range from design, architecture and development of greenfield projects to maintenance, latency tuning and enhancements. Qualifications 4+ years’ experience of C++ development...

Senior Flutter Developer - Outside IR35 - Contract   A rare opportunity to join our fast-growing technology company selling high-value software development services. An ideal role for an experienced and dynamic developer who wants to be involved with an exciting and challenging project.   Must have   Several years of experience developing customer-facing mobile apps for both iOS and Android, using Flutter. Experience working as part of a team (including tools to support collaboration, such as git and user story management software) Experience working closely with other job roles, such as designers and product owners   Nice to have   Experience with mobile back-end development / Node Experience of CI/CD/DevOps for mobile apps Experience collaborating with clients or stakeholders, including clarifying requirements and presenting work at sprint demos Have experience delivering great outcomes for...

Senior/Lead Java Developer About Synechron: Synechron is a leading digital transformation consulting firm dedicated to delivering innovative technology solutions within banking, financial services, and insurance. We thrive on engineering excellence, collaboration, and a passion for cutting-edge technologies. We are seeking a highly skilled and experienced Senior/Lead Java Developer with 10+ years of hands-on experience in enterprise application development. The ideal candidate must possess strong expertise in core Java fundamentals, concurrency, and distributed systems , along with exposure to AI/ML-driven solutions . This role demands a deep understanding of data structures, system design, performance optimization, and scalable architecture , along with the ability to lead technical initiatives and mentor teams. This role is Inside IR35 contract Job Locatio n: London (Hybrid - 3 days in the offi ce) Key Responsibilities: Design, develop, and...

Company Description At Data Intellect , we thrive on solving complex data challenges in high-stakes environments. We’re a team of engineers, problem-solvers, and collaborators who believe in pushing boundaries, not egos. If you're a seasoned C++ Developer ready to lead, innovate, and make an impact, we want to hear from you. Job Description As a C++ Developer at [DI], you will focus on developing Front Office Trading software, primarily working within the market data development teams. You will gain exposure to the full software stack, using modern development tools and concepts to deliver high quality, best practice software solutions. This will involve working on the end-to-end development of low latency software components written in C++. Project responsibilities will range from design, architecture and development of greenfield projects to maintenance, latency tuning and enhancements. Qualifications 4+ years’ experience of C++ development...

Company Description At Data Intellect , we thrive on solving complex data challenges in high-stakes environments. We’re a team of engineers, problem-solvers, and collaborators who believe in pushing boundaries, not egos. If you're a seasoned C++ Developer ready to lead, innovate, and make an impact, we want to hear from you. Job Description As a C++ Developer at [DI], you will focus on developing Front Office Trading software, primarily working within the market data development teams. You will gain exposure to the full software stack, using modern development tools and concepts to deliver high quality, best practice software solutions. This will involve working on the end-to-end development of low latency software components written in C++. Project responsibilities will range from design, architecture and development of greenfield projects to maintenance, latency tuning and enhancements. Qualifications 4+ years’ experience of C++ development...

About Synechron: Synechron is a leading digital transformation consulting firm dedicated to delivering innovative technology solutions within banking, financial services, and insurance. We thrive on engineering excellence, collaboration, and a passion for cutting-edge technologies. Job Location: Glasgow (Hybrid - 3 days in the office) This is Inside IR35 contract. About the role: We are seeking a highly experienced Senior Java Developer with over 10 years of hands-on Java development experience and extensive exposure to AI/ML-driven systems. The ideal candidate will design, build, and scale enterprise-grade applications while integrating modern AI capabilities such as machine learning models, generative AI, and intelligent automation into Back End systems. Key Responsibilities Hands-on experience working with the latest versions of Java (eg, Java 17 or above) Design, develop, and maintain high-performance, scalable Java applications using...

Role Summary Wagglyn is looking for an experienced QA Engineer / Test Lead to work with the existing engineering team on the testing and release readiness of its MVP trading platform. This is a hands-on contract role for someone who has tested complex financial or real-time systems before. It is not a generic web QA role and not a manual-testing-only role.   Scope The contractor will help define and execute the QA process across the front end, backend services, market data, execution flows, deployment environments and operational readiness. The role involves working with engineering, product and stakeholders to make sure releases are testable, repeatable and safe to promote through UAT and production-like environments. QA here is about proving the system behaves safely when data is live, services reconnect, orders are sent, risk state changes and deployments happen.   Profile ·      Hands-on QA...

Our Digital Engineering team at ITG are responsible for building world class, enterprise grade digital applications for high profile brands. We pride ourselves in working with mature Agile methodologies and make use of the latest versions of technology. Our teams are structured in such a way that gives every employee the opportunity to learn new skills, work on various projects over time and see the results of your efforts in the online consumer marketplace. Joining the Digital Engineering function would see you work as part of a cross-functional, product style team, generally consisting of a Business Analyst, Scrum Master / Project Manager, Solution Architect, Lead Developers (FE and BE), Developers, and Testers (Manual and Automated). Projects will range from working on main brand websites with huge amounts of multi-lingual content, through to smaller one-off projects such as marketing micro-sites. You will also be involved in delivering a wide range of web-based projects...

Java is your bag and you're a real perfectionist. You'll have a background in hands-on software delivery, will be passionate about everything Java and driven by the world of tech. Operating right at the heart of our Backend development function, you'll work on some of our most exciting business critical and complex software applications. We have a number of exiting opportunities available across our development teams here at Storyteq and have plenty going on. If you haven't heard of us already, you will have sooner or later! We are a visionary SaaS marketing company who pride ourselves on our ability to stay ahead of the game when it comes to both the tech and creative landscape. What you’ll be doing: Working with our bar raising development team comprised of like-minded professionals who find solutions to complex problems Develop complex Java code, working with both monolithic and microservices architecture Be responsible for estimating development...

• Have experience of the full software development lifecycle and different software development models; will be expected to develop software using Bank methods, processes and standards. • Have in depth full stack development experience, methods and tools relating to the team’s area of responsibility including C#, .NET, SQL, React. • Have a good understanding of technical architectures. • Have in depth experience of tools that support the development process. This should include Git, Visual Studio and SQL Server Management Studio. • In depth experience working with relational databases • Be able to demonstrate a high level of professionalism, organisation and self-motivation • Have good interpersonal communication skills with an ability to interpret and present information to a variety of recipients using suitable modes of communication. • Have a consistent track record of forming and maintaining positive...

ID: 59907   1 Opening BRISTOL       Role description Senior Data Center Engineer Bristol, UK – Onsite Contractor Inside IR35 or 6 month Fixed Term Employment Contract Infrequent Travel Required to Israel (travel expenses paid)   Are you a hands-on data center expert who thrives on solving complex infrastructure challenges? We’re looking for a Senior Data Center Engineer to lead large-scale, enterprise-grade data center initiatives, driving projects from initial assessment through to full operational readiness. Based in Bristol, this is a high-impact role where you’ll be at the forefront of data center transformation, shaping resilient, scalable environments while partnering directly with clients and senior stakeholders.   What you’ll be doing: Own end-to-end data center transformation programmes: Lead...

Role: Semantic Knowledge Architect Location: London Duration: Contract The Context: Thebes Group is a Optimisation Company. We are engaged on an AI transformation programme for a private equity group, focused exclusively on group-level operations, not fund management or investment activity. The programme is building AI agents to support day-to-day group operations: workflow, reporting, information management and operational decision-making. A foundation ontology and taxonomy already exists, and the organisation's data is mapped and manageable in scope. This is not a greenfield engagement. The Semantic Knowledge Architect joins an established delivery team that includes an AI engineer responsible for agent development. The two roles work in close partnership: the AI engineer builds and maintains the agents; this role owns the knowledge layer those agents depend on. The Role: Your responsibility is the quality, integrity and evolution of the semantic...

Salesforce Automation Test Engineer (Day Rate Contractor) Contract Type Day Rate Contractor Closing Date 2 July, 2026 Job Category Tech, Data and Digital Business Unit Systems and Infrastructure (UKT) Location London , United Kingdom Posted on 2 June, 2026 The opportunity  We are looking for a Salesforce Automation Test Engineer (Day Rate Contractor) in support of our IT modernisation efforts who will be required to drive forwards the multi level testing of key system developments. The role holder will be responsible for testing a catalogue of new features, working collaboratively with UK and Swedish development teams, whilst focusing on the timely delivery of agreed outcomes that meet both business and customer needs.  The successful candidate will have knowledge and extensive experience in automation testing, to enable a fast feedback loop for the development teams working on business-critical...

Blackstone& are a technical consultancy who specialise in digital transformation and complex technical deliveries. 15 years ago that meant Cloud adoption. 10 years ago it was DevOps. 5 years ago, SRE and platform engineering. We still cover all of that, but you guessed it, a lot of our work right now is AI adoption. And we mean actual AI adoption: in production, in Enterprises. Not just a vibe coded app on a local machine.   The pace and impact of each wave keeps accelerating, but we think successful adoption still comes down to two things: people and constraints. What does transformation actually look like inside the limits of an organisation, and how do we bring the people along for it?   Interested in helping us answer those questions for our customers?   WHAT YOU'LL BRING Core Skills Solid back-end engineering foundations. You write code that others can read, test, and build on Hands-on experience with AWS Bedrock,...

Java is your bag and you're a real perfectionist. You'll have a background in hands-on software delivery, will be passionate about everything Java and driven by the world of tech. Operating right at the heart of our Backend development function, you'll work on some of our most exciting business critical and complex software applications. We have a number of exiting opportunities available across our development teams here at Storyteq and have plenty going on. If you haven't heard of us already, you will have sooner or later! We are a visionary SaaS marketing company who pride ourselves on our ability to stay ahead of the game when it comes to both the tech and creative landscape. What you’ll be doing: Working with our bar raising development team comprised of like-minded professionals who find solutions to complex problems Develop complex Java code, working with both monolithic and microservices architecture Be responsible for estimating development...

Our Digital Engineering team at ITG are responsible for building world class, enterprise grade digital applications for high profile brands. We pride ourselves in working with mature Agile methodologies and make use of the latest versions of technology. Our teams are structured in such a way that gives every employee the opportunity to learn new skills, work on various projects over time and see the results of your efforts in the online consumer marketplace. Joining the Digital Engineering function would see you work as part of a cross-functional, product style team, generally consisting of a Business Analyst, Scrum Master / Project Manager, Solution Architect, Lead Developers (FE and BE), Developers, and Testers (Manual and Automated). Projects will range from working on main brand websites with huge amounts of multi-lingual content, through to smaller one-off projects such as marketing micro-sites. You will also be involved in delivering a wide range of web-based projects...