38 senior software engineer jobs found

Senior Software Engineer - Kotlin £550-£650 per day | Outside IR35 Hybrid | London (3 days onsite) A leading UK financial services organisation is seeking a Senior Software Engineer to play a central role in a large-scale platform transformation programme. The business is rebuilding a critical part of its digital infrastructure to support a broad range of transaction methods and channels across both in-person and digital environments. This is hands-on Back End engineering at scale, with real ownership and direct exposure to architecture decisions from day one. Key Responsibilities as a Senior Software Engineer: Design and build Kotlin Back End services for a new payments platform Own the architecture and design of key components, taking high-level requirements and turning them into structured, deliverable backlogs Write clean, well-tested, production-ready code that the team can rely on Work closely with Product and Engineering to break down complex...

Opportunity for a Senior Software Engineer to work for a retail company near Manchester going through a large digital transformation. This is an initial 6-month contract outside IR35 to help deliver re-platforming of existing systems to an event-driven MACH architecture. Skills: TypeScript, Node, React AWS, Lambdas Event-driven MACH architecture CI/CD In return they're offering an initial 6-month outside IR35 contract paying up to £500/day. If you're interested and would like to know more, please apply through this advert and I'll be in touch.

A Contract position Outside IR35 Hybrid working 3 days on site Our client, a leader in the automotive sector, is currently seeking a Senior Controls Software Engineer to join their dynamic team on a contract basis. This role involves working on the development of Inverter and Motor Control, Battery Management System (BMS), and Charging application software for demonstrator and production projects. You will play a pivotal role in all stages of the software development process, mentor junior engineers, participate in project estimations and planning, and collaborate with clients, suppliers, and other engineering teams. Key Responsibilities: Provide technical delivery and leadership of application software activities Support and mentor junior engineers within the team Create and manage software requirements Participate in the architectural design of the software Implement and test the application software using a model-based development approach Support prototype vehicle...

Candidate Specification - SourceWise Solutions Staff Software Engineer (Backend / Platform) This is a remote contract role with occasional visits to the client's office when required. The engagement is Outside IR35, offering a daily rate of £500 About SourceWise SourceWise Solutions partners with innovative global technology companies to build high-performing engineering teams. We connect experienced engineers with organisations building modern, scalable software platforms. About the Opportunity This Staff Software Engineer role is with one of our international technology clients. You will influence architecture, engineering practices, and technical direction while solving complex, high-impact problems. Key Responsibilities · Lead architecture and design of scalable distributed systems. · Own complex cross-team engineering challenges. · Drive technical strategy and influence engineering decisions. · Improve platform scalability, reliability, and maintainability. ·...

Senior Software Engineer (Contract) - Remote must be UK based 6 months contract Outside IR35 We're seeking a Contract Senior Software Engineer to lead the design and delivery of enterprise software across cloud, web, and AI-driven development (Github Copilot, Claude) . The Software Engineer will provide hands-on technical leadership, modernise legacy platforms, define solution architecture, and deliver scalable cloud-native applications using the Microsoft technology stack. Key skills: .NET, ASP.NET Core, .NET Framework, MVC Azure (Functions, App Services, Storage, AI, Azure DevOps) SQL Server (expert level) Angular, JavaScript/TypeScript, HTML5, jQuery CI/CD, microservices, clean code, AI-assisted development (GitHub Copilot, Claude) Core Responsibilities Own the end-to-end architecture for enterprise applications. Lead the design and delivery of cloud-native solutions on Microsoft Azure . Drive modern engineering practices including CI/CD, clean code,...

Senior Software Engineer - Kotlin & Coroutines. £500/day LTD CO OUTSIDE IR35. 100% REMOTE. An interest in AI (Agentic AI, AI tooling, Claude, Codex or Co-Pilot) highly advantageous but not essential. We are looking for a Senior Backend Engineer (Kotlin & Coroutines essential) to build the integrations that connect AI companion with senior care and hospital software platforms. In this role, you will design, build, and maintain robust Back End services and integrations that enable seamless data exchange between the company and partner systems. You'll take end-to-end ownership of integration projects-from discovery and architecture through implementation, deployment, and continuous improvement. Key Responsibilities for the Kotlin & Coroutines Developer are: Design, develop, and maintain integrations between my clients platform and third-party healthcare and senior care software systems. Build scalable, secure, and maintainable Back End services and APIs using...

Greetings from Response Informatics!! We are currently hiring a Dot net Developer for an exciting client engagement. Role: Dot net Developer  Location: Taunton, UK (3 days' travel per month) Positions: Contract (Outside IR35) Clearance: Active SC Clearance Mandatory Please ensure: CV is a maximum of 3 pages Font size: 11 We are seeking an experienced Senior Software Engineer to design, develop, and maintain enterprise-scale Azure-based applications within a secure and highly regulated environment. The role requires strong hands-on expertise in C#, .NET, Azure, and cloud-native development practices. The Senior Software Developer will work closely with Lead Developers, Architects, DevOps Engineers, Testers, and Product Owners to deliver secure, scalable, and maintainable solutions while contributing to engineering excellence and continuous improvement initiatives. Key Responsibilities Design, develop, and maintain applications...

Candidate Specification - SourceWise Solutions Staff Software Engineer (Backend / Platform) This is a remote contract role with occasional visits to the client's office when required. The engagement is Outside IR35, offering a daily rate of £500 About SourceWise SourceWise Solutions partners with innovative global technology companies to build high-performing engineering teams. We connect experienced engineers with organisations building modern, scalable software platforms. About the Opportunity This Staff Software Engineer role is with one of our international technology clients. You will influence architecture, engineering practices, and technical direction while solving complex, high-impact problems. Key Responsibilities · Lead architecture and design of scalable distributed systems. · Own complex cross-team engineering challenges. · Drive technical strategy and influence engineering decisions. · Improve platform scalability, reliability,...

Senior Optimisation Engineer | £800 - £1000 | Outside IR35 Workforce Scheduling Greenfield Build We're partnering with a high-growth software company that is rebuilding the optimisation engine behind a market-leading workforce scheduling platform. This is not a maintenance role and it's not a traditional machine learning position. This is an opportunity to design and build a next-generation optimisation engine from the ground up, tackling complex workforce scheduling challenges involving labour rules, preferences, fairness, coverage, cost optimisation and demand-aware scheduling. The goal is ambitious: move beyond hand-crafted heuristics and create a scalable optimisation platform where schedule quality improves with more data, more usage and more compute. What you'll be doing: Designing and implementing optimisation models for workforce scheduling and rostering Evaluating and benchmarking different approaches including CP-SAT, MIP, constraint...

Specialism Software Engineering, Platform Engineering, AI/ML Job type Contract Location London Rate £500 - £600 per day We are looking for a Senior Backend Engineer to join an early stage team that is actively reimagining software for an industry tech forgot. For decades, blue collar businesses have powered the backbone of everyday life while relying on fractured, legacy infrastructure. They sit on vast amounts of unstructured, highly valuable data locked inside on-prem databases, servers, and CSV dumps. Data that their teams simply don't have the tools to leverage. By pairing modern LLM breakthroughs with reliable backend engineering, our client is changing that, transforming amorphous legacy data into clear, actionable insights for nontechnical teams on the ground. Working directly alongside AI founders, you won't just write code; you will shape what modern data infrastructure looks like in this space. You'll take full ownership of the backend,...

Specialism Software Engineering, Platform Engineering, AI/ML Job type Contract Location London Rate £500 - £600 per day We are looking for a Senior Backend Engineer to join an early stage team that is actively reimagining software for an industry tech forgot. For decades, blue collar businesses have powered the backbone of everyday life while relying on fractured, legacy infrastructure. They sit on vast amounts of unstructured, highly valuable data locked inside on-prem databases, servers, and CSV dumps. Data that their teams simply don't have the tools to leverage. By pairing modern LLM breakthroughs with reliable backend engineering, our client is changing that, transforming amorphous legacy data into clear, actionable insights for nontechnical teams on the ground. Working directly alongside AI founders, you won't just write code; you will shape what modern data infrastructure looks like in this space. You'll take full ownership of the backend,...

Senior DevOps Engineer (AI-First Platform Engineering) Remote | 3-Month Contract | £525 per day | Outside IR35 We're seeking an experienced Senior DevOps Engineer to join a growing Platform Engineering function on an initial 3-month contract. This is an opportunity to work at the forefront of modern cloud engineering, supporting a business as it transitions towards an AI-first engineering model . You'll be responsible for maintaining and evolving Azure-based platforms, driving automation, supporting cloud infrastructure at scale and helping embed AI-assisted delivery practices across the engineering life cycle. Working across both established services and emerging AI-driven workloads, you'll play a key role in ensuring the platform remains secure, scalable, cost-effective and ready for future growth. Why Join? Be part of an organisation actively embracing AI-first engineering and software delivery. Work with modern Azure, Kubernetes and Infrastructure-as-Code...

IT Engineer (Short-Term Contract) | Outside ir35  Location: Office-Based Contract: 3 Months  We're currently recruiting on behalf of a well-established organisation seeking an experienced IT Engineer to provide hands-on support during a busy period of growth and change. This is an excellent opportunity for a versatile IT professional who enjoys a varied role, combining day-to-day technical support with the confidence to take ownership of small projects and provide guidance across the wider IT function. The RoleWorking as part of a small IT team, you'll be responsible for supporting users across a Microsoft-based environment while assisting with the smooth day-to-day running of the IT infrastructure. You'll act as a reliable point of contact for technical issues, helping to prioritise workloads, maintain systems, and ensure a high level of service across the business. Key Responsibilities Provide 1st, 2nd and some 3rd line technical support to internal users. Support and...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract click apply for full job details

🚨 Senior Playwright SDET | £700/day | Outside IR35 | Front Office Trading | London I'm working with a leading global investment bank looking to hire an exceptional Playwright SDET to join their Front Office Derivatives Technology team. This isn't your typical automation role. You'll be embedded within a high-performing engineering team, working directly alongside developers on a strategic front end trading platform. The rate reflects the calibre of engineer they're looking for. 💰 Package £700 per day Outside IR35 12-month rolling contract 1 day per week in the London office What they're looking for This role is suited to a highly technical SDET who is passionate about automation and enjoys writing production-quality code. You must have: ✅ Strong commercial experience with Playwright ✅ Excellent coding skills in JavaScript and TypeScript ✅ Experience building and maintaining automation frameworks ✅ Previous experience working on...

QA Lead/Test Lead - Ellucian Banner, Playwright, Education, Higher Education Xpertise have an urgent requirement for a QA Lead/Test Lead - Ellucian Banner, Playwright, Education, Higher Education. Candidates will have the following essential skills and experience: Proven experience as a QA Lead , Test Lead or Senior QA Engineer. Strong commercial experience working with Ellucian Banner . Detailed understanding of Banner modules, processes and integrations. Hands-on experience with Playwright test automation. Experience creating and maintaining automated testing frameworks. Strong understanding of software testing methodologies and QA best practices. Experience within Higher Education/Education environments. Knowledge of Student Information Systems (SIS). Experience with API testing and integration testing. Familiarity with Agile delivery methodologies. Experience working within cloud-based environments. Remote - outside IR35 - UK based only...

Technical Project Manager/Scrum Master (Hands-on Development) - Hybrid London Start Date: August/September 2026 Duration: 3-6 months (Likely Extensions) Day Rate: £800-£900 per day (Negotiable) IR35 Status: Outside IR35 Location: London (Hybrid - Minimum 3 days per week onsite) Key Skills & Experience: Technical Leadership & Delivery Proven experience operating as a Technical Project Manager, Scrum Master or Technical Delivery Lead. Strong Agile delivery experience across multiple software development teams. Experience managing complex technical projects within Banking or Capital Markets. Comfortable managing both technical delivery and stakeholder expectations. Strong understanding of software development life cycle, Agile methodologies and engineering best practices. Hands-on Software Development: This is a hands-on technical role. Candidates must remain technically active and able to contribute directly to software development....

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with Product Managers, Engineers and technical...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with Product Managers, Engineers and technical...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We 're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You 'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with...