1 to 25 of 29 Contract Software Engineer Jobs in London

CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence/cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in … an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R&D companies, Multi-National Consultancies to SME's and product based companies. Due to the nature of the work these clients do … you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver packages of bespoke work, work development teams and liaise with customers. You will work through the entire software development life cycle from requirements More ❯

Senior Software Engineer (MongoDB/Django) 6-Month Contract Outside IR35 Fully Remote About the Role Were looking for a Senior Software Engineer with deep expertise in MongoDB to help solve complex integration challenges between Django and MongoEngine within a live production environment. This is a hands-on engineering role, suited to someone who can move … on effective MongoDB usage patterns and integration strategies. Help evolve internal tooling, libraries, and data access layers to streamline development. What Were Looking For Proven experience as a Senior Software Engineer with a strong focus on backend systems and database design. Advanced MongoDB knowledge schema design, aggregation pipelines, performance tuning, replication, and indexing strategies. Strong experience with Django More ❯

Contract Software Engineer - Enhanced DV Cleared New Contract Opportunity for a Software Engineer with Data experience in London with eDV Clearance New contract opportunity to work on operational projects across the National Security domain Enhanced DV Clearance required for high-side IT access London based (on site, minimum 4 days per week) Daily rate up to … To apply, get in touch: dominic./About Join a leading consultancy delivering innovative and secure technology solutions across highly operational national security projects . We're seeking a Software Engineer to support and enhance critical systems within a dynamic, high-performing team. You'll work across development and DevOps activities, supporting complex environments that underpin key national More ❯

A well-established business is looking for an accomplished Software Engineer with expert Python skills to join its organisation. Please note, this role is Outside IR35. The company embraces hybrid and flexible working so you will be able to work fully remotely, with occasional visits (perhaps once per month) to the office in London. Web, software, and … AI-enabled technology are fundamental to the success of the business so you must have proven experience of developing great software in Python and an interest in adopting cutting-edge technology. In order to be suitable for this Lead Software Engineer role you must be an accomplished developer with a passion for technology and desire to mentor … role of significant responsibility, you will be both a Lead Developer and guide 2 in-house developers and an offshore team. You will act as a technical authority on software written in Python, lead architectural discussions, code, ensure technical quality and deliver complex software projects. You will also partner with key stakeholders to drive forward technological innovation and More ❯

The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for a Software Engineer (AI Prompts) for a 6 month contract based in either the bank's London or Edinburgh office on a remote first working model. Purpose of the role … The Software Engineer (AI Prompts) will help build and support intelligent automation use cases end-to-end and will be pivotal in engaging with business stakeholders to understanding requirements, crafting effective prompts and ensuring governance, quality and maintainability throughout the life cycle. Responsibilities of the Software Engineer (AI Prompts): Design and optimise prompts for AI language More ❯

Full Stack Software Engineer Full Stack Software Engineer The location of the role is London (hybrid working) . The duration of the contract is 6 months . The pay rate on offer is £750 - £880 per day (via Umbrella - inside IR35) . Key responsibilities Front end implementation for a React application Visualizing and interacting with scientific … data and workflow progression Integration of AI/ML components with frontend, backend, data and compute infrastructure Responsible for high quality software implementations according to best practices, including automated test suites and documentation Develop, measure, and monitor key metrics for all tools and services and consistently seek to iterate on and improve them Participate in code reviews, continuously improving … staff and data engineers in the team and across allied teams, to build an end-to-end pipeline consuming other data products Basic qualifications: 5+ years' experience with frontend software development (e.g. React) Demonstrated experience of Python development (e.g. using FastAPI) Bachelor's degree in a relevant field (including computational, numerate or life sciences), or equivalent experience Cloud experience More ❯

Full Stack Software Engineer - AI/ML Full Stack Software Engineer - AI/ML The location of the role is London (hybrid working) . The duration of the contract is 6 months . The pay rate on offer is £750 - £880 per day (via Umbrella - inside IR35) . Key skills: Python, generative AI, language models/… NLP, AI ML, front end development Summary Competitive candidates will have a track record of writing and shipping quality, well-documented and well-tested software in the AI/ML industry. We are looking for candidates with experience in the field of Responsible AI, preferably for generative AI or language applications. In addition to ML engineering and data science … Perform user research to understand the application's risks and failure modes. Integration of AI/ML components with frontend, backend, data and compute infrastructure Responsible for high quality software implementations according to best practices and expected to participate in code reviews. Liaise with other technical staff and data engineers in the team and across allied teams, to build More ❯

Software Engineer (SC & NPPV3) 6 Month Contract Fully Remote Rate: £500 - £600 per day (Inside IR35) Skills: C#.Net, XML/JSON API's, SC & NPPV3 Clearance We are looking for an experienced Software Engineer to join a high-profile public sector project. You will play a key role in designing, building, and maintaining software solutions … .NET 6+ Work with XML/JSON APIs for integration and data exchange Develop and execute automated tests with MSTest Collaborate with stakeholders to gather and analyse requirements Ensure software is secure, scalable, and maintainable Essential Skills Strong commercial experience in C# In-depth knowledge of .NET Framework and .NET 6+ Proven experience working with XML/JSON APIs More ❯

Senior C++ Software Engineer New C++ contract role working on a greenfield project for a client within the financial domain. Healthy rate for this one and 2 days a week in the office. What you will be doing: As a Senior C++ Software Engineer, you will be involved in: Analysis of user requirements and translation into … into manageable chunks Implementation of new features and feature enhancements Leading code reviews and enforcing best practice within a small, agile, focused team What you will need: Extensive commercial software development experience using C++ Unix/Linux experience Relevant degree in a numeric discipline, or equivalent work experience Excellent written and spoken English By applying to this job you More ❯

Job Title: Software Engineer Horizon Experiences (C#/Unity Application Development) Duration: 6 Months (High Possibility of Extension) Location: London, UK Work Mode: Hybrid (3 Days On-Site, 2 Days Remote) About the Role: Join a global leader in the AR/VR space, working on cutting-edge experiences that are shaping the future of social connection and … is part of a high-impact team responsible for advancing a major virtual reality platform building tools, services, and runtime systems that power first-party metaverse applications. As a Software Engineer on the Runtime & Asset Pipeline team , youll contribute to improving system reliability, runtime stability, and performance of immersive applications built with Unity and C#. You'll collaborate … and runtime systems. Work on system profiling, debugging, and performance tuning. Support CI/CD efforts including build capacity management, automated testing, and incident response. Act as a generalist engineer with the ability to operate across multiple technologies and domains. Requirements: Strong software development experience in C# and Unity . Experience with C++ and familiarity with performance profiling More ❯

Position: Software Engineer Smallworld (GSW) Location: Fully Remote (UK/Europe) Contract Duration: 12 months (with extension opportunity) Contract Type: (UK- Inside IR35), (Europe -B2B), (Permanent contracts available as well UK/Europe) Start Date: November 1, 2025 (Flexible) Overview/Essential Responsibilities: The Software Engineer Smallworld will be responsible for developing, customizing, and maintaining applications … customer-specific customization and integration, including environments utilizing Citrix . Manage and maintain databases ( SWMFS DBA , VMDS , SQL , Oracle ). Utilize and manage source control systems and follow standard software development processes . Develop and maintain tools and applications using Magik , Java , JSF , and FME . Troubleshoot, debug, and resolve complex system and application issues. Support installation and configuration … of Smallworld suite components and apply operating system patches , fixes , and third-party software (e.g., ONA, Data Center Management). Analyze system performance, identify bottlenecks, and implement effective solutions. Collaborate closely with cross-functional teams to deliver high-quality software solutions. Document configurations, workflows, and system updates for ongoing maintenance and support. Primary Skillset: Smallworld suite (Core SW4 More ❯

Role: Software Engineer (Java, TypeScript, JavaScript, NodeJS, ReactJS, Python) Location: Remote working with some meetings at offices either in Manchester or London. IR35 status: Outside Length of contract: 5 months initial contract (with a view to possible extension) Overview We are seeking a Software Engineer to support the delivery and maintenance of shared engineering components and … and EKS. Navigate specific change and governance processes to deliver code and changes to the estate. Coordinate stakeholders and embed continuous improvement practices across engineering teams. Skills & Experience Strong software development background, especially with TypeScript, JavaScript, NodeJS, ReactJS, Python, and Java. Experience with enterprise-scale engineering environments. Familiarity with DevOps practices and performance measurement. Excellent stakeholder coordination and governance More ❯

Backend Software Engineer - AI/ML 6-month contract | Inside IR35 | Up to £800 per day | 2-3 days per week in London We're supporting a global R&D organisation in the build-out of its AI and ML engineering platforms. The team is responsible for productionising and scaling ML models that power drug discovery and predictive … research. They're seeking a Backend Software Engineer to lead development of APIs and data infrastructure supporting these ML applications. What you'll be doing: Develop backend systems for ML-driven applications using Python (FastAPI) Build data and compute integration pipelines with cross-functional AI teams Design testing and deployment frameworks for model reliability Work collaboratively in agile More ❯

This is a fantastic opportunity to work as a Sofware Engineer, on a long term contract, working for a major finance company, inside IR35 and fully remote. The key skills required for this Software Engineer role are below. Low latency FX Matching Java C++ (desirable) trading (desirable) SQL Gradle If you do have the relevant experience for … this remote Software Engineer position, please do apply. More ❯

Do you have a passion for enabling developer "flow" and building lightning-fast build experiences? We are seeking an experienced and collaborative Senior Software Engineer to drive the next generation of developer tooling as we build a unified, robust, and scalable monorepo ecosystem . Role: Senior Software Engineer Experience: 8+ years Location: Fully remote but should More ❯

Do you have a passion for enabling developer "flow" and building lightning-fast build experiences? We are seeking an experienced and collaborative Senior Software Engineer to drive the next generation of developer tooling as we build a unified, robust, and scalable monorepo ecosystem . Role: Senior Software Engineer Experience: 8+ years Location: Fully remote but should More ❯

Software Engineer - Robotics Systems Job Experience Contract Details : £500-800 Per Day, 6-month contract, outside IR35, hybrid (2-3 days/week in London). Role Overview: Develop and integrate robotic software systems, focusing on production-level coding and sensor integration in an Agile environment within an exciting start-up. Required Experience - Jira, Python, Docker, ROS2 … C++ Minimum 3 years of production-level software engineering in robotics or related fields. Developed robotic manipulators (kinematics, dynamics, motion planning) using Python (NumPy) and C++ (Eigen). Integrated sensors (RGB, depth, LiDAR) for navigation/localisation on platforms like Clearpath using ROS2 . Worked in Agile (Scrum) teams, managing tasks with Jira , contributing to sprints and retrospectives. Applied More ❯

Backend Software Engineer, GenAI Term: 6 months Pay: £888 per day Inside IR35 Location: Kings Cross London 2-3 days per week Our client see a world in which advanced applications of Machine Learning and AI will allow us to develop novel therapies to existing diseases and to quickly respond to emerging or changing diseases with personalized drugs … products and solutions at the cutting edge of Machine Learning and AI, as well as extensive safety and robustness evaluations. We're looking for a highly skilled machine learning engineer to help us make this vision a reality. Competitive candidates will have a track record of writing and shipping quality, well-documented and well-tested software in the … responsibilities Backend development of generative AI evaluations for a Python web application Integration of AI/ML components with frontend, backend, data and compute infrastructure Responsible for high quality software implementations according to best practices, including automated test suites and documentation Participate in code reviews, continuously improving personal standards as well as the wider team and product Liaise with More ❯

company expanding its Responsible AI division. The team are building a next-generation Generative AI platform to accelerate drug discovery and safety evaluation. They're looking for a Backend Software Engineer to help design and develop backend systems supporting large-scale LLM and GenAI workloads. The role will focus on backend architecture, API integration, and automation across data More ❯

Software Developer - eDV Rate: £700 - £770 a day Duration: Initially 6 months Location: Cheltenham, Manchester or London Clearance: Current eDV is required The role is working within the National Security sector for a global IT consultancy. Java development Object store configuration and containerisation Docker, Kubernetes Back-end software development using Python and Java Relational databases and SQL Experience … integrating 3rd party software, scripting/glue work Experience building and deploying web user interfaces Experience working closely with or in national security missions Agile approaches to delivery Good problem-solving skills and understanding of how to trace faults/errors in the system Ability to present technical ideas clearly and work well with customers and stakeholders More ❯

THE COMPANY This organisation is pushing the boundaries of AI and data-driven software, developing next-generation tools that integrate advanced machine learning with scalable backend systems. They're looking for an experienced Python Backend Engineer to support the build and integration of key AI components across their tech stack. THE ROLE As a Contract Python Backend Engineer More ❯

Must-Have (Non-Negotiable): 10+ years of professional software engineering experience, with 5+ years in Go. Proven ability to solve complex problems end-to-end, not just implement tickets. Deep understanding of Go’s concurrency model (goroutines, channels, memory model). Strong grasp of computer fundamentals: memory, CPU, I/O. Experience with distributed systems, APIs, and cloud-native More ❯

Months Start Date: ASAP We are looking for an experienced Full-stack Developer for a 6-month contract in London. In this role, you will build and maintain software solutions and take ownership of your projects from start to finish. What You'll Do: Build, test, and deploy new features across the full stack. Write clean, high-quality code … participate in code reviews. Find and fix bugs and solve complex technical problems. Help improve system performance, testing, and monitoring. What You'll Need: 3-5+ years of software development experience. Strong skills in TypeScript/JavaScript and Golang (or Java/Kotlin/C++). Experience with front-end frameworks like Angular or React . A solid More ❯

Months Start Date: ASAP We are looking for an experienced Full-stack Developer for a 6-month contract in London. In this role, you will build and maintain software solutions and take ownership of your projects from start to finish. What You'll Do: Build, test, and deploy new features across the full stack. Write clean, high-quality code … participate in code reviews. Find and fix bugs and solve complex technical problems. Help improve system performance, testing, and monitoring. What You'll Need: 3-5+ years of software development experience. Strong skills in TypeScript/JavaScript and Golang (or Java/Kotlin/C++). Experience with front-end frameworks like Angular or React . A solid More ❯

I'm currently recruiting for a long-term contract position to start ASAP. The opportunity is outside IR35 and remote with flexibility on rates. Project Scope - Develop new software services in a modern programming language to replace legacy systems and enable distributed operation. - Implement reliable communication layers and ensure seamless integration between software and hardware. - Design and deliver … fault-tolerant solutions capable of operating in demanding environments. - Support testing, verification, and documentation to maintain high standards across the project lifecycle. Key Skills - Very experienced in professional software development, especially Rust - Proficiency in Python or similar higher level language - Experience with Linux-based development - Experience with inter-process communication protocols If you think you'd be a good More ❯