42 software engineer jobs found

Senior C# Software Engineer (Contract) Location: London (Hybrid) Rate: £500 per day IR35 Status: Outside IR35 Duration: 6 Months (Initial) The Opportunity Join a high-performing engineering team within a London-based powerhouse that is currently dominating its sector. This company has moved past the startup phase into a period of sophisticated, sustainable growth, and they are now maturing their global platform to be truly cloud-agnostic. This role is perfect for a Senior Engineer who thrives on architectural variety. You won’t just be maintaining a single environment; you will be building high-throughput systems that leverage the best features across AWS, Azure, and GCP . The Role As a Senior C# Engineer, you will lead the development of mission-critical services that form the backbone of a rapidly scaling infrastructure. Your focus will be: Backend Development: Writing clean, testable, and high-performance code using the latest...

Guidance & Control Software Engineer (Interception Systems)Location: North London - HybridType: Contract - Outside IR35Rate: Starting at £50 per hour DOE About the Role Our client develops advanced autonomous weapon and interception technologies designed for high-speed target engagement in contested environments. The programme centres on a vision-guided one-way aerial system capable of autonomously detecting, tracking, and intercepting manoeuvring objects. The software architecture combines real-time perception with predictive guidance and control. This role will be central to the development of the onboard flight and guidance stack, implementing estimation, tracking and control algorithms in performance-critical C++ code. The engineer will work closely with perception, simulation and hardware teams to ensure reliable terminal behaviour under real-world conditions. The Guidance & Control Software Engineer position suits an engineer with experience in missile guidance,...

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis. With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders This is a completely hands-on role where you will develop and maintain scalable, full-stack web applications using Next.js and Node.js We are looking for: Demonstrable and proven experience in full-stack applications (inc. working knowledge of a range of technologies such as React, Node.js and TypeScript). Experience with Azure and ARM templates including dev and deployment of supporting cloud infrastructure (inc. pipelines). Excellent, in-depth understanding of BDD, TDD and SOLID principles. In-depth...

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis click apply for full job details

I'm looking for an experienced AI Engineer to join an exciting, fast‑growing AI start‑up on a 6‑month contract. This is a great opportunity to work on cutting‑edge AI products and play a key role in designing, building and deploying real‑world AI systems.Tech Requirements We are looking for someone with strong commercial experience in: AI Engineering – designing, building and deploying AI systems TypeScript Node.js Python AWS Cloud Desirables Prior AI start‑up experience Ability to thrive in fast‑moving, high‑growth environments Contract Details 6‑month initial contract Outside IR35 Fully remote (must be based in the UK) Must have full right to work in the UK

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...

I'm looking for an experienced AI Engineer to join an exciting, fast growing AI start up on a 6 month contract. This is a great opportunity to work on cutting edge AI products and play a key role in designing, building and deploying real world AI systems. Tech Requirements We are looking for someone with strong commercial experience in: AI Engineering - designing, building and deploying AI systems TypeScript Node.js Python AWS Cloud Desirables Prior AI start up experience Ability to thrive in fast moving, high growth environments Contract Details 6 month initial contract Outside IR35 Fully remote (must be based in the UK) Must have full right to work in the UK

I 'm looking for an experienced AI Engineer to join an exciting, fast-growing AI start-up on a 6-month contract. This is a great opportunity to work on cutting-edge AI products and play a key role in designing, building and deploying real-world AI systems. Tech Requirements We are looking for someone with strong commercial experience in: AI Engineering - designing, building and deploying AI systems TypeScript Node.js Python AWS Cloud Desirables Prior AI start-up experience Ability to thrive in fast-moving, high-growth environments Contract Details 6-month initial contract Outside IR35 Fully remote (must be based in the UK) Must have full right to work in the UK

Role Details: Contract Length: 3–6 months (potential to go permanent) IR35: Outside IR35 Location: Remote, with occasional travel to London/Kent preferred Day Rate: £300–£325 per day Key Requirements: Hands-on exposure to Azure AI and Machine Learning Experience with Agentic AI, RAG systems, and GraphRAG At least 10+ years’ experience in .NET Please note: This role cannot offer sponsorship. Applicants must have full rights to live and work in the UK.

Role Details: Contract Length: 3-6 months (potential to go permanent) IR35: Outside IR35 Location: Remote, with occasional travel to London/Kent preferred Day Rate: £300-£325 per day Key Requirements: Hands-on exposure to Azure AI and Machine Learning Experience with Agentic AI , RAG systems , and GraphRAG At least 10+ years' experience in .NET Please note: This role cannot offer sponsorship. Applicants must have full rights to live and work in the UK.

Role Details: Contract Length: 3 -6 months (potential to go permanent) IR35: Outside IR35 Location: Remote, with occasional travel to London/Kent preferred Day Rate: £300 - £325 per day Key Requirements: Hands-on exposure to Azure AI and Machine Learning Experience with Agentic AI , RAG systems , and GraphRAG At least 10 + years' experience in .NET Please note: This role cannot offer sponsorship. Applicants must have full rights to live and work in the UK.

Senior Software Engineer | Python | Outside IR35 | Remote We are supporting a high-profile public sector programme delivering an AI-enabled product from proof of concept through to user testing. This is a hands-on Senior Software Engineer role where you will take significant ownership of delivery, working as part of a multidisciplinary team to build, iterate and operationalise an AI use-case MVP. The Role As a Senior Software Engineer, you will play a key role in delivering a greenfield AI solution from early-stage prototype into a robust, testable product. Working closely with engineers, data scientists and a User-Centred Designer, you will help shape the architecture, build a new user interface, and ensure the solution is production-ready within a secure cloud-native environment. This is a senior, hands-on engineering role suited to someone comfortable taking ownership of significant components or services across the full lifecycle - from design and build through to...

We 're partnering with a fast-growing sports/entertainment business looking to hire a Senior Backend Engineer on a 6-month contract (outside IR35), with potential to convert to permanent ( £95k). This is a hands-on tech lead role with ownership of core platform systems powering multiple websites and internal services. The Role You 'll take full technical ownership of the NextGen CMS and Master Data (MDM) systems, designing, developing, and mentoring a small team of engineers. This role is perfect for someone who thrives in complex, high-scale environments and wants real impact from day one. Key Responsibilities: Lead development across CMS and MDM systems Maintain and expand complex backend systems (not standard CMS) Mentor engineers and set engineering standards/patterns Drive architecture, integrations, and system scalability Work closely with stakeholders to deliver features and improvements Team Environment:...

We 're partnering with a fast-growing sports/entertainment business looking to hire a Senior Backend Engineer on a 6-month contract (outside IR35), with potential to convert to permanent ( £95k). This is a hands-on tech lead role with ownership of core platform systems powering multiple websites and internal services. The Role You 'll take full technical ownership of the NextGen CMS and Master Data (MDM) systems, designing, developing, and mentoring a small team of engineers. This role is perfect for someone who thrives in complex, high-scale environments and wants real impact from day one. Key Responsibilities: Lead development across CMS and MDM systems Maintain and expand complex backend systems (not standard CMS) Mentor engineers and set engineering standards/patterns Drive architecture, integrations, and system scalability Work closely with stakeholders to deliver features and improvements Team Environment:...

We 're partnering with a fast-growing sports/entertainment business to hire a Senior Backend Engineer with hands-on experience in HubSpot and complex backend systems. This is a 6-month contract, outside IR35, with potential for extension or permanent conversion. The Role You 'll take full ownership of the Commercial Data Manager (CDM) platform and the HubSpot ecosystem, bringing previously external-managed systems fully in-house. This role combines backend development, integrations, and stakeholder collaboration, giving you real technical leadership and system ownership from day one. Key Responsibilities: Lead the CDM platform (70%) and HubSpot system (30%) Take over HubSpot maintenance, expansion, and integrations Collaborate closely with commercial stakeholders to implement new fields/features Mentor engineers and shape team practices Drive architecture and integration decisions across multiple services Team...

Java Developer Contract – 6 Months Outside IR35 Hybrid - 1 day per month in London office We’re looking for an experienced Java Developers to join a fast-paced engineering team on an initial 6-month contract (Outside IR35). You’ll be contributing to the development and enhancement of scalable backend systems in a collaborative, delivery-focused environment. Responsibilities Design, develop, and maintain high-quality Java applications Build and improve backend services and APIs Write clean, testable, and efficient code Collaborate with engineers, QA, and stakeholders to deliver features Participate in code reviews and technical discussions Requirements Strong commercial experience with Java Solid understanding of object-oriented design principles Experience building backend systems and APIs Familiar with unit testing and best coding practices Comfortable working in an agile development environment Ideal for a contractor who...

C#.NET EOS Developer (ETRM) Contract: 6 months initial (extension likely) Location: London Rate: Competitive, Outside IR35 Overview A Global energy trading organisation seeking an experienced C#.NET Developer to support and enhance EOS-focused ETRM platforms across power, gas and environmental markets. The role sits within a specialist trading technology team delivering system enhancements, integrations and ongoing optimisation in an agile environment. Responsibilities Develop and enhance EOS trading and risk applications using C#.NET (WinForms, WCF). Translate EOS trading requirements into technical solutions in collaboration with BAs and delivery leads. Design and optimise SQL Server databases supporting trading and operational workflows. Maintain code quality through testing, standards and peer review. Manage CI/CD pipelines and deployments via Azure DevOps. Support legacy and vendor/inherited codebases. Deliver against agile sprint commitments....

Java Developer Contract – 6 Months Outside IR35 Hybrid - 1 day per month in London office We’re looking for an experienced Java Developers to join a fast-paced engineering team on an initial 6-month contract (Outside IR35). You’ll be contributing to the development and enhancement of scalable backend systems in a collaborative, delivery-focused environment. Responsibilities Design, develop, and maintain high-quality Java applications Build and improve backend services and APIs Write clean, testable, and efficient code Collaborate with engineers, QA, and stakeholders to deliver features Participate in code reviews and technical discussions Requirements Strong commercial experience with Java Solid understanding of object-oriented design principles Experience building backend systems and APIs Familiar with unit testing and best coding practices Comfortable working in an agile development environment Ideal for a contractor who...

Software Development Engineer in Test with strong experience in Data Testing of financial products required for a prestigious financial service client in London. The role will involve working on a big Transformation Programme, and suited candidates will have the following hands-on experience; C#, Python, JavaScript/Typescript, SQL and test automation frameworks such as Playwright, Specflow, Agile and TDD. Strong data testing knowledge in SQL, Snowflake or Databricks. Strong Azure DevOps, Azure, Git, and SQL. Proficiency in Jira, Confluence. Proven track record of writing, executing, and maintaining complex test scripts. Demonstrated ability to lead testing efforts and mentor junior team members. Strong problem-solving skills, with an emphasis on consensus-building and collaboration. Strong Microsoft Skills, including PowerPoint & Excel; understand and document Process Maps using tools such as Visio. The ideal candidate will have recently completed a similar...

Senior Software Engineer | Python | Outside IR35 | Remote Cloud, Data & AI Platforms We are supporting a consultancy with a substantial UK portfolio as it accelerates its digital, data and AI capability. As part of a wider transformation programme, we're looking for a Senior Software Engineer to help design and deliver scalable cloud-native platforms, with increasing adoption of AI and machine learning to drive smarter decision-making. This is a senior, hands-on role within a multidisciplinary engineering environment, blending modern software delivery, cloud platform engineering and emerging AI/ML integration. The Role As a Senior Software Engineer, you will contribute to the design and build of robust digital and data services, while enabling the integration of AI/ML capabilities into core platforms. You'll work closely with data engineers, data scientists and product teams to ensure models and analytics solutions are production-ready, scalable and secure....