16 software engineer jobs found in London

CONTRACT AI SOFTWARE ENGINEER - OUTSIDE IR35 - SC Cleared NEW CONTRACT OPPORTUNITY AVAILABLE Rate: Up to £600 per day Location: London / Remote-first Working Pattern: Part-time, 2-3 days per week; predominantly remote with occasional London workshops Contract Length: 3 months initially, with extension likely IR35 Status: Outside IR35 Start Date: 19th October 2026 (subject to availability) I 'm currently working with an organisation delivering innovative AI and data solutions within the UK public sector, who are looking for an experienced AI Software Engineer to join an initial 3-month engagement on a part-time basis. This is an opportunity to help shape how a new public sector organisation operates using AI from the outset, combining hands-on engineering with the design of AI-enabled workflows, governance and operating models. THE ROLE You 'll work as part of a collaborative engineering team, helping design and build...

C++ Software Engineer - Outside IR35 Contract London, UK Long-Term Engagement on a Rolling Contract Hybrid Working We have partnered with a leading Technology Firm who are looking to add a Software Engineer with skills on C++ to their Market Data team! The successful candidate will have experience in Financial Markets Technology and Real Time market data expertise. It's a Front Office position so you must be comfortable speaking with Portfolio Managers, Traders, C-Suite etc... Responsibilities will include: Architecture and Implementation of Low Latency C++ systems (robust, resilient, accurate, stable and fast) - by doing this you will position the client as a leader in Quant Trading. Work alongside hardware and software teams to build Real Time market data processing. Define, implement and enforce SLAs, policies and metrics to monitor the area. Develop Systems, Interfaces and tools to historical market data simulations to increase research...

About the job Senior Java Developer London Contract £650 - £750 per day outside IR35 Hybrid - 2/3 days onsite in the City We're partnering with a specialist consultancy to build a greenfield asset tokenisation platform for a major global financial institution. This is a hands-on Java engineering role focused on building the platform from scratch, solving complex technical challenges and shaping the future of the firm's digital assets capability. You'll be joining at the start of the journey, with the opportunity to influence both the platform and the wider programme as it grows. What you'll be doing Build a greenfield asset tokenisation platform using Java. Develop new services and platform components in a Linux environment. Work closely with other engineers to shape the design and direction of the platform. Solve complex engineering problems in a fast-moving environment. Use modern AI coding tools such as Claude Code, Windsurf or Devin as part of...

Senior Developer – Front Office RAD / Trader Tools £700 p/day | Outside IR35 | Largely remote | 12-month contract We are hiring a hands-on Senior Developer for a prestigious investment banking client, delivering tactical fixes and enhancements directly for front-office traders. This role suits someone who thrives in a RAD/tactival environment : quick to understand a problem, comfortable with changing priorities and able to deliver practical, reliable solutions at pace. The focus is on short development cycles, immediate business needs and improving existing trading tools , rather than a long-term strategic programme. Initial work will support Securities Lending , with opportunities to work across other trading desks. What we’re looking for: Strong development experience in C#, Python and Excel Proven experience in front-office RAD or tactical development A quick-thinking, pragmatic problem solver who can work independently Confidence working...

Role: Senior Applied AI Engineer (Defence Contractor) Rate: £700-£900 per day, dependent on experience Location: Oxford / London Engagement: Contract, outside IR35: initial 6-month term with strong likelihood of extension Start: Immdediate start. Hybrid, with regular time on site in Oxford or London Security clearance: You must be eligible for UK security clearance (BPSS and SC. We require applicants to hold UK passport and 5 years of continuous UK residency. We can sponsor clearance for the right candidate, but given the contract nature of this role we strongly prefer candidates who already hold an active, transferable SC; DV is an advantage. If you are not eligible, we will not be able to progress your application. A note from the Founders Oxford Dynamics is at an inflection point. We build frontier AI for environments where the cost of a wrong decision is high: defence and national security, critical infrastructure, and commercial organisations making...

Senior C# Developer - up to £600 per day - REMOTE Role Type: Contract Title - Senior C# Engineer Client - Established Financial Institution Rate - Up to £600 P/D - OUTSIDE IR35! Location - Remote Duration: 6 month rolling My client is a well-established and successful tech house working in the finance sector who are looking a talented senior C# Developer, with outstanding technical and communication skills to join their existing team of software engineers and work on an exciting new project! You will get the chance to work with some of the best technologists out there, one some of the most up to date tech in the industry, on a greenfields project! This is a 6 month rolling Contract, with high possibility of extension, and can pay up to £600 P/D Requirements: Strong experience working with C#/.Net Experience working with Cloud Technologies (Azure preferred) Finance experience a plus! Strong Communication skills with a drive to be working with the best...

Senior C# Developer - Investment Banking £750/day | Outside IR35 | 12-month rolling contract | Largely Remote If you're a strong C# engineer with genuine Event Sourcing experience and interested in a long term banking project, get in touch I'm working with a leading investment bank looking for a strong Senior C# Developer to join a long-term project building and enhancing a large-scale Structured Notes platform. This is a hands-on engineering role with approximately 80% Back End C#/20% Front End, working on complex, distributed systems. The role: You'll be working across a modern .NET platform, designing and developing scalable Back End services while contributing to the Angular Front End where required. The environment involves large-scale distributed systems, asynchronous processing, Multithreading and event-driven architecture. Core technical requirements: Excellent C#/.NET development experience Strong .NET 8 knowledge Previous commercial Event...

DevOps/Cloud Engineer (AWS) | Active SC Clearance Required Rate: £550-600 per day (Outside IR35) Location: Hybrid, London (2 days per week onsite) Duration: Initial 3 month contract with likely extension Start Date: ASAP Clearance: Active SC Clearance (Mandatory) The Opportunity We are supporting a major government programme seeking an experienced DevOps/Cloud Engineer to join a high-performing cloud engineering team. This role will focus on the design, automation and support of secure cloud infrastructure, enabling the delivery of modern digital services at scale. You will work closely with software engineers, architects and security teams to build resilient platforms, improve deployment processes and drive cloud adoption through infrastructure automation and DevOps best practices. Key Responsibilities Design, build and maintain AWS cloud infrastructure Develop and manage Infrastructure as Code using Terraform Build and improve CI/CD pipelines using...

🚨 Principal Forward Deployed Engineer | Sovereign AI | Outside IR35 | £650–850 per day I’m working on an exciting contract opportunity for a Principal Forward Deployed Engineer to join a growing team delivering cutting-edge AI solutions across defence and national security. This is a hands-on, technically demanding role for someone who enjoys taking products from 0 to 1, solving complex infrastructure challenges and getting software deployed into highly secure, restricted and air-gapped environments. 💰 £650–850 per day 📄 3–6 month contract 💼 Outside IR35 📍 London | 1–2 days per week on-site 🔐 Active DV clearance essential 🔍 What you’ll be doing: *Leading technical engagements with senior defence, engineering and security stakeholders. *Owning deployments end to end, from requirements gathering through to integration, testing, accreditation and handover. *Adapting cloud-native applications to Kubernetes, OpenShift, on-premise, private cloud...

Senior Full Stack Engineer. £600-£650 per day | Outside IR35 We're supporting a leading financial services organisation in the search for a Senior Full Stack Engineer to join a product-focused team building customer-facing digital solutions. Experience within Insurance, InsurTech, FinTech, Banking, or another regulated industry is highly desirable. This is a hands-on role where you'll take ownership of delivery across the full software lifecycle, from design and development through to deployment, optimisation and support, working with modern cloud-native technologies on Microsoft Azure . Key Requirements Strong full stack engineering experience TypeScript and React (Angular or Vue also welcome) Backend development with .NET, Node.js, Java or Python Azure cloud-native application development REST APIs, microservices and event-driven architecture CI/CD, automated testing and DevOps practices Docker, Kubernetes and Terraform Experience delivering...

Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Permrequirement for an immediate start. The Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Perm will be working for a leading specialty insurance broking group, Embedded as the senior technical lead within one of several product squads. You'll work alongside a Development Manager, Product Owner and development team, owning technical direction with genuine autonomy and influence. Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Perm Key Skills: A career software developer, with a distinguished-engineer mindset: you own outcomes, not tickets London Market experience is essential, ideally gained within a broker (eg building or supporting a broker workbench or placement platform). Insurer, MGA, carrier or InsurTech backgrounds will also be considered Strong...

Senior Java Developer - Outside IR35 - Up to £700 per day Hybrid in Central London October Start Date 12-Month Initial Contract We have partnered with a leader in the financial services sector who is looking for experienced Senior Java Engineers to join their Settlements team . This is a hands-on engineering role focused on developing and enhancing software supporting complex post-trade and settlement workflows . you'll work as part of an experienced engineering team, contributing to both new and existing systems within a fast-moving financial markets environment. The Role Develop and maintain Server Side Java/JVM applications supporting settlement and post-trade processes. Build robust, scalable services using Spring and Spring Boot . Work across greenfield and brownfield development projects. Collaborate with engineers and business stakeholders to understand requirements and deliver effective solutions. Contribute to technical design,...

Security Engineer/Security Consultant (Application Security & Threat Modelling) Rate - £550 - £650 Outside IR35 Duration - 6 months initial Location - Bristol/London (once a week/remote) Role overview: A leading Financial Services is seeking an experienced Security Engineering Consultant on a contract basis. The successful candidate will be Embedded within engineering tribes, providing security consultancy and guidance to development teams throughout the software development life cycle. The primary focus of the role is threat modelling. The consultant will conduct threat models for new and existing products, identify risks at the design stage and work with developers to mitigate those threats during development, ensuring that products are secure by design. Key responsibilities: Conduct and document threat models across products and services, from initial design through to delivery Work with development teams to mitigate identified threats during...

Security Engineer / Security Consultant (Application Security & Threat Modelling) Rate - £550 - £650 Outside IR35 Duration - 6 months initial Location - Bristol / London (once a week / remote) Role overview: A leading Financial Services is seeking an experienced Security Engineering Consultant on a contract basis. The successful candidate will be embedded within engineering tribes, providing security consultancy and guidance to development teams throughout the software development lifecycle. The primary focus of the role is threat modelling. The consultant will conduct threat models for new and existing products, identify risks at the design stage and work with developers to mitigate those threats during development, ensuring that products are secure by design. Key responsibilities: Conduct and document threat models across products and services, from initial design through to delivery Work with...

Position: Tech Lead Location: London/Remote Daily Rate: £650 to £700 outside IR35 Clearance: UKSV SC Clearance Required We're working with a central government client at the forefront of innovation, delivering cutting-edge digital, data, and AI solutions that make a real public impact. This is a unique opportunity for a Tech Lead to shape and scale emerging technologies - from early Proof of Concept through to production - within a fast-paced, high-trust environment. You'll lead end-to-end design across software, data platforms, and AI systems, while providing independent technical assurance to ensure solutions are secure, ethical, and fit for purpose. Working across multidisciplinary teams, you'll drive innovation in areas like DevOps, platform engineering, and MLOps - balancing experimentation with governance and risk. What you'll be doing: Leading architecture, design, and delivery of digital & AI solutions Driving innovation across AI, analytics, and emerging...

Senior Allegro ETRM Developer – C#/.NET A leading energy trading organisation is looking for an experiencedAllegro ETRM Developer to join their technology team on a long-term contract. The role will focus on designing, developing and supporting solutions across theAllegro ETRM platform , working closely with technical and business stakeholders to deliver solutions for complex energy trading requirements. Key Responsibilities • Design and deliver solutions across theAllegro ETRM platform . • Own the full software development lifecycle, from requirements and solution design through to deployment, support and continuous improvement. • Work closely with Product Owners, Business Analysts and stakeholders to translate business requirements into technical solutions. • Develop and support enterprise applications usingC# and .NET . • Follow strong software engineering practices around testing, version control, code quality and secure development. •...