43 software engineer jobs found in London, Greater London

Fully Remote (UK) | Outside IR35 | Day Rate Flexbile (DOE) Fancy getting in early on a medical device project? We're working with a client who needs an experienced Embedded engineer to help bring a Legacy system up to scratch, reporting directly to the technical lead. What you'll be doing: Developing and maintaining Embedded C firmware on STM32 Working within an ISO 13485/IEC 62304 regulated environment Getting to grips with (and improving) a Legacy codebase Helping shape the project scope and timelines from the start What they're looking for: Strong Embedded C on ARM microcontrollers, ideally STM32 Hands-on experience of IEC 62304 and ISO 13485 Keil experience is a bonus Bonus points if you've got opinions on how AI coding tools fit into Embedded work The project is still being scoped, so it's a great chance to have a say in how it's shaped. If it sounds like your kind of thing, drop me a message or send over your CV.

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...

Python/Django Software Engineer Location: Remote, with 1 to 2 days a month in London Rate: £500/day Outside IR35 Duration: 3 months initial Sector: Central Government Must be SC Cleared Overview We're looking for a Python/Django Software Engineer to join a central government programme. You'll build and improve digital services on AWS, working in a multidisciplinary team to deliver reliable, secure and user-focused software. Key Responsibilities Design, build and maintain web applications and APIs in Python and Django Develop and deploy services on AWS Write clean, well-tested and maintainable code Take part in code reviews and help raise engineering standards Work with product, design and delivery colleagues in an Agile team Support CI/CD pipelines and automated testing Troubleshoot and fix issues across development and live environments Key Requirements Strong commercial experience with Python and Django Hands-on AWS experience covering services such...

Tech Lead / Principal Engineer – Contract Location: London Canary Wharf – 4 days onsite (no flex) Start Date: 2nd November 2026 Duration: Initial contract until 24th December, with potential extension Outside IR35 - rate depending on experience We're looking for an experienced Tech Lead / Principal Engineer to support a major financial services engagement with one of our consultancy partners. This is a senior, client-facing technical role, focused on solution architecture, systems integration and technical leadership across complex mobile and backend platforms. You'll be joining a fast-paced project, working closely with engineering teams and senior stakeholders to understand existing technology landscapes, identify architectural gaps and shape scalable, secure technical solutions. The Role Lead solution architecture and technical design across mobile applications, backend services and integrations. Assess existing systems, map technical...

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...

SC Graph Data Engineer Fully Remote Outside IR35 Up to £450 per day 6-Month Contract Active SC clearance is essential. The Opportunity We are seeking an experienced Graph Data Engineer to join our Data Engineering team on a freelance basis. You will work closely with data engineers, software engineers, architects and business stakeholders to design, develop and maintain scalable, high-performanc click apply for full job details

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...

AI Enabled Full Stack Engineer - Outside IR35 £500/day - 3 month contract - 1 day p/week in London I'm working with a leading European technology business that has recently undergone a major technology transformation, building a new AI-driven, cloud-native platform now live with a significant customer base. They're looking for multiple AI Enabled Engineers on a contractual basis to continue enhancing the platform, maintaining their industry leading status. We're looking for innovative full stack engineers with strong software engineering fundamentals, particularly those with: A genuinely AI-first approach to development, using tools such as Claude, Cursor or Copilot as part of your daily workflow Strong C#/.NET experience - now building in Python/Typescript Good Angular or React experience Experience with AWS/cloud-native development Strong software engineering fundamentals across APIs, databases, testing and CI/CD Experience with LLMs, agentic systems or...

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 £700 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...

SC Graph Data Engineer Fully Remote | Outside IR35 | Up to £450 per day | 6-Month Contract Active SC clearance is essential. The Opportunity We are seeking an experienced Graph Data Engineer to join our Data Engineering team on a freelance basis. You will work closely with data engineers, software engineers, architects and business stakeholders to design, develop and maintain scalable, high-performance data solutions, with a particular focus on graph databases, data modelling, entities and relationships . This is a hands-on engineering role suited to someone with strong commercial experience in Neo4j, Cypher, AWS and Python , alongside a proven ability to build robust, scalable data pipelines and deliver effective data integration and transformation solutions. Key Skills and Responsibilities Graph Data Engineering Strong commercial experience working with Neo4j . Advanced proficiency in Cypher , including query development and optimisation. Strong...

SC Graph Data Engineer Fully Remote | Outside IR35 | Up to £450 per day | 6-Month Contract Active SC clearance is essential. The Opportunity We are seeking an experienced Graph Data Engineer to join our Data Engineering team on a freelance basis. You will work closely with data engineers, software engineers, architects and business stakeholders to design, develop and maintain scalable, high-performance data solutions, with a particular focus on graph databases, data modelling, entities and relationships . This is a hands-on engineering role suited to someone with strong commercial experience in Neo4j, Cypher, AWS and Python , alongside a proven ability to build robust, scalable data pipelines and deliver effective data integration and transformation solutions. Key Skills and Responsibilities Graph Data Engineering Strong commercial experience working with Neo4j . Advanced proficiency in Cypher , including query development and optimisation. Strong...

Principal Full Stack Engineer - Azure AI Search & Elasticsearch 6-month contract Outside IR35 London - 2 days onsite We are looking for a Principal Full Stack Engineer to lead the design and delivery of enterprise search and AI-driven applications. This is a senior, hands-on contract combining search architecture, full-stack development, Microsoft Azure, DevOps and Generative AI. Key responsibilities Design and optimise enterprise search solutions using Elasticsearch and Azure AI Search. Define Elasticsearch cluster architecture, index mappings, aggregation queries and life cycle strategies. Improve search relevance, indexing performance, query latency and platform resilience. Build Azure AI Search solutions using indexers, custom skillsets, vector search and semantic ranking. Develop responsive, search-focused applications using JavaScript/TypeScript and React, Angular or Vue. Design and integrate APIs and Back End services across the Azure ecosystem. Build...

AI Engineer (Enterprise AI Platforms & Architecture) 📍 London Hybrid (2 Days Onsite) - Ideally 📅 6 Month Contract 💷 Outside IR35 Overview We are seeking an experienced AI Engineer to help design, build and scale enterprise-grade AI solutions within a complex technology environment. This role is suited to someone who has moved beyond experimentation and prototypes and has successfully delivered AI platforms, products and capabilities into production at enterprise scale. You will play a key role in defining how AI is built, governed and operated across the organisation, working closely with engineering, architecture, security, platform, data and product teams. This is a highly influential role requiring a blend of hands-on engineering capability, enterprise architecture exposure and practical experience implementing AI solutions in production environments. The Opportunity You will help shape the future AI engineering capability of the organisation by...

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...

Technical Product Manager Contract Duration : 12 months Location : Hybrid, Central London Job Type: Contract, paying outside IR35 SC Clearance is required We are seeking a Technical Product Manager to join our team on a 12-month contract basis. This role involves managing a cloud-based occupancy data platform hosted within AWS, which integrates data from multiple sources to generate occupancy insights and support data-driven decision-making. The ideal candidate will bridge business stakeholders and technical delivery teams, ensuring that the product development aligns with strategic objectives and delivers tangible business outcomes. Day-to-day of the role: Own and manage the product backlog, aligning priorities with business objectives and delivery capacity. Define and communicate the product vision, roadmap, and strategic priorities. Translate stakeholder requirements into clear epics, features, user stories, and acceptance criteria. Make...

Our client, a leading technology organisation working across financial services and energy trading, is looking for experienced Senior Java Engineers to join its engineering teams within the post-trade/settlements area. This is a hands-on software engineering opportunity, working on complex, bespoke solutions for financial markets clients. You’ll be involved across both greenfield and brownfield development, working closely with experienced engineering teams to solve challenging technical and business problems. The role sits within a Post-Trade environment, with additional exposure to digital assets and blockchain technology. Outside R35 contract which is extendable to 12 months! Up to £700 Day rate as well! • Develop and enhance server-side Java/JVM applications, with Java as the primary back-end technology. • Build robust services using Spring and Spring Boot. • Work across greenfield and brownfield projects within financial services, trading and post-trade...