15 senior software engineer jobs found in London

Senior Software Engineer - AI-Assisted Legacy Medernisation Outside IR35 - Contract (Insurance Client) About the role Softwire is helping our client modernise a business-critical legacy platform, moving it off Oracle Forms and onto a modern React and .NET stack, with the underlying Oracle database migrating to Azure SQL. We're looking for a strong full-stack contract developer to join the existing team and drive this migration forward. What sets this role apart is that the use of AI tools is the main focus, not a nice-to-have. You'll use tools such as Claude to accelerate the translation of Oracle Forms logic into the new stack and to support the database migration. We want someone who already works this way day to day and can show how AI changes the pace and quality of their delivery. Key Responsibilities Work alongside our team to migrate the legacy product onto a React / .NET architecture, keeping pace with the team's Jira workflow. Use AI tools...

Senior Software Engineer - Outside IR35 - Contract (Energy Client) About the role Softwire is looking for an experienced Software Engineer to join a team delivering the first phase of a major replatforming project. You will work in a collaborative, technically focused environment, helping to modernise a data platform that currently relies on Power Automate, Power BI, and Python scripts. You can work remotely from anywhere in the UK, as client site visits aren't mandatory. Phase one of the project will introduce a SQL database and Azure Function Apps, alongside a migration of data from SharePoint into the new database. This is a hands-on engineering role with real impact from day one. Key Responsibilities Design and build Azure Function Apps to support the replatforming initiative. Develop and maintain SQL database schemas, queries, and data pipelines. Contribute to the migration of data from SharePoint into the new database. Work with existing Power...

Senior Software Engineer - Outside IR35 - Contract (Insurance) About the role Essential: Self-starter, someone who can pick up context quickly, drive outcomes efficiently, and to a high quality Competent in doing high-level designs, solution management, and scoping Understanding of data modelling best practices Ability to translate technical solutions to non-technical stakeholders and bring them on the journey Experience working in an agile delivery environment Experience working with React, TypeScript, Azure, Microsoft SQL, and Databricks (if they don’t have all of these, that’s workable, but be good to understand any they don’t have experience with) Frontend: React + TypeScript + Vite Material UI with Emotion for styling TanStack React Query 5 for server state React Router 7 React Hook Form+Yup for forms/validation MSAL for Entra ID auth Jest+Testing Library for unit tests; Playwrightfor E2E and visual tests Hosted as an Azure Static...

SC/DV Cleared Technical Lead Engineer I'm looking for an experienced Lead Engineer with active SC or DV Clearance to provide technical leadership across complex cloud and software delivery programmes. You'll work closely with engineering teams, architects, delivery leads, and stakeholders to guide solution design, drive engineering best practice, and support successful delivery from concept through to production. Rate : £600-£650/day Outside IR35 Location : London (2-3 days/week) Contract Length : 12 months Clearance : Active SC or DV (non-negotiable) Key Responsibilities Provide technical leadership across delivery teams. Guide solution design, implementation, and operational readiness. Review technical approaches to ensure scalability, security, and maintainability. Mentor engineers and promote engineering best practices. Support Agile delivery and continuous improvement initiatives. Collaborate with architecture, security, DevOps, and testing teams. Act as an...

Lead Backend Software Engineer - Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700-£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and can balance...

Lead Backend Software Engineer - Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700 - £800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We 're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you 'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We 're looking for someone who enjoys building from first principles, thrives in...

Senior Data Engineer - Outside IR35 - Contract (Insurance Client) About the role Softwire is seeking an experienced Data Engineer with a strong knowledge of Python (including PySpark) and SQL, and a good understanding of software engineering best practices (including SDLC, CI/CD, automated testing, DevOps) to join an established small team working on delivering a data & analytics platform in Microsoft Fabric for a speciality insurance provider. This is a senior, hands-on role that will require owning and delivering workstreams independently while supporting a junior team member. Key Responsibilities Building new ingestion pipelines in Microsoft Fabric using Python (PySpark) notebooks Modelling data for consumption in Power BI through a dimensional gold warehouse layer and a semantic model Improving platform performance Working across cross-functional areas such as logging, monitoring (with Azure Log Analytics and Fabric) and data governance (within...

2nd Line IT Support Engineer - Contract Outside IR35 ~ 6 month contract - likely extension/potential for temp-perm Day Rate: DOE Hybrid: 3-4 days a week onsite in White City/Shepherd's Bush 1 Stage Interview Process - Immediate start Our client, a well-established and growing retail organisation, is looking for an experienced 2nd Line Engineer to join their IT team on a long term contract, providing expert support and helping maintain the stability, security, and performance of their systems. Reporting to the Senior IT Manager, you'll be a key escalation point for 1st line support, get involved in infrastructure projects, and mentor junior team members. What you'll be doing: Resolving complex issues escalated from 1st line within SLA, with clear user communication throughout Diagnosing software, hardware, and network issues, focused on root cause Escalating to 3rd line/vendors where needed, with proper handover Supporting server, network, and...

We're partnering with a leading energy trading organisation at the forefront of global commodities markets, currently investing heavily in their ETRM platform. As part of this growth, they're looking for an experienced Java Developer to join a high-performing engineering team delivering scalable, front-to-back trading solutions. This is a standout opportunity for a strong Java engineer with energy trading exposure who is keen to step into the world of Endur ETRM and OpenComponents, gaining highly sought-after domain and platform expertise  The Opportunity You'll work on business-critical systems that support trading, risk, and operations across power, gas, and wider commodities markets. The role blends core Java engineering with the chance to quickly upskill in Endur, supported by a team of experienced SMEs. This is ideal for someone looking to bridge the gap between pure software engineering and specialist ETRM platforms Responsibilities Designing and...

🚀 Senior Front-End Engineer – Investment Banking | Contract Upto £800 p/d (Outside IR35) | London / Hybrid (1 Day/Week in Office) We are partnering with a global investment bank to hire a Senior Front-End Engineer to join a flagship team delivering a next-generation, single-page application (SPA) platform for high-performance derivatives trading. This is a high-profile role on a mission-critical, front-office system with exceptional technical standards. You’ll work at the cutting edge of financial technology, contributing to a modern, reactive web platform used across trading desks. This is not your typical enterprise UI – it’s fast, data-intensive, and built to scale with real-time demands in a trading environment. 💼 The Opportunity Collaborate with elite engineers on a SPA used across the investment bank for derivatives trading. Build elegant, high-performance UIs with real-time data updates and functional programming paradigms. Shape a front-end...

Lead Backend Software Engineer – Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700–£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and...

2nd Line IT Support Engineer - Contract Outside IR35 ~ 6 month contract - likely extension or temp/perm opportunity  Day Rate: DOE Hybrid: 3-4 days a week onsite in White City/Shepherd's Bush 1 Stage Interview Process - Immediate start Our client, a well-established and growing retail organisation, is looking for an experienced 2nd Line Engineer to join their IT team on a long term contract, providing expert support and helping maintain the stability, security, and performance of their systems. Reporting to the Senior IT Manager, you'll be a key escalation point for 1st line support, get involved in infrastructure projects, and mentor junior team members. What you'll be doing: Resolving complex issues escalated from 1st line within SLA, with clear user communication throughout Diagnosing software, hardware, and network issues, focused on root cause Escalating to 3rd line/vendors where needed, with proper handover Supporting server, network, and...

Full Stack Engineer (Contract - Junior/Mid) Location: Hybrid - 3 days per week - London Day Rate : Up to £350 per day outside IR35 This is a unique opportunity to work on a highly sophisticated platform where AI sits at the heart of the product. The Opportunity You'll be working across a modern TypeScript monorepo, developing scalable features across the frontend, backend, data layer, and AI integrations. The role offers exposure to cutting-edge AI technologies while providing the opportunity to deepen your expertise under the guidance of an experienced software architect. If you're passionate about modern engineering, enjoy solving complex technical challenges, and are eager to work at the forefront of AI-powered software development, we'd love to hear from you. Tech Stack: TypeScript, React, Node.js, Next.js Tailwind CSS SQLite AI integrations including Anthropic Claude, OpenAI, and Google Gemini GitHub Actions CI/CD Microsoft Azure (migration...

Product Manager Outside IR35 Contract £300 - £350 per day | 2 Days Onsite in Central London We’re working with an established retail business undergoing a significant technology and operational transformation, and we’re looking for a Product Manager to join the team on an initial 6-month Outside IR35 contract. This is a business that has been operating successfully for over 10 years but still maintains a genuinely entrepreneurial culture. There’s very little hierarchy, decisions are made quickly, and Product and Engineering work closely together to deliver meaningful change across the organisation. This is a hands-on Product Manager role focused heavily on delivery. You’ll work closely with a Senior Product Manager and Engineering teams, taking broad business objectives and helping turn them into clear, actionable work that can be delivered by development teams. We're looking for someone who enjoys getting into the detail, working directly with engineers,...

We're looking for a hands-on Build/Deployment Engineer to support large-scale IT deployment projects within secure government environments. London (5 Days On-Site) Active SC Clearance Required Outside IR35 Essential Experience: Active SC Clearance 2nd Line Support/EUC/Tech Bar experience Windows 10/11 device builds and deployments Microsoft Intune Windows Autopilot SCCM/MECM ServiceNow or similar ITSM tool Strong troubleshooting skills across hardware and software Excellent customer-facing communication skills Responsibilities: Deploy and configure laptops and end-user devices at scale Deliver remote and face-to-face user onboarding sessions Support office-based and classroom-style deployments Troubleshoot deployment issues and provide user support Maintain accurate asset and ticket records Work closely with project and technical teams to ensure successful rollouts Desirable: Workspace ONE experience ITIL...