13 senior software engineer jobs found

Senior Software Engineer (Contract) 3-Month Engagement | Outside IR35 | Up to £475 per day | Hybrid (London / Ipswich) A rapidly expanding SaaS company is seeking an experienced Senior Software Engineer to support their agile delivery team on an initial 3-month contract. This position offers a strong mix of hands-on development and strategic input, with the opportunity to shape system architecture, influence engineering practices, and contribute directly to product evolution. You'll play a key role in designing, building, and improving scalable cloud-native applications, while also guiding team members and promoting high standards across the development lifecycle. Core expertise required: Advanced experience with C# and .NET (Framework and Core) Frontend development using TypeScript, HTML, CSS, and either React or Vue Proven track record with AWS, ideally including serverless architectures (e.g., Lambda) Experience with CI/CD pipelines and Infrastructure as Code...

Senior Software Engineer | £400-425/day | Outside IR35 | 6 Months | Fully Remote (UK based) I am currently working with a company who are looking for a Senior Software Engineer expert knowledge of databases. You will be responsible for scaling backend services, architecture, cloud-based solutions and API designs. Skills: ⚙️Typescript/ Node ⚙️PostgreSQL/ DynamoDB/ MongoDB ⚙️AWS ⚙️Lambda/Serverless ⚙️API Gateway ⚙️Cloudwatch Due to data sovereignty implications, the client cannot hire anyone that is outside of the UK. Interview: 2 stage Rate: £400-425/day Duration: 6 Months Outside IR35 They are looking to for someone to start on or before March 16th. Senior Software Engineer | £400-425/day | Outside IR35 | 6 Months | Fully Remote (UK based)

Outside IR35 Contract Software Engineer (React & AWS) Leading Media Organisation Digital Platform (UI & UX?Led) Location: Hybrid (London or Manchester) Day Rate: Competitive Contract Length: 6 months + Overview We are working with a leading UK media organisation to engage an experienced Contract Software Engineer to support the development of a large'scale, user?centric digital platform. The platform is UI and UX?heavy, highly visible, and used by millions, sitting at the intersection of content, information, and media. This role goes beyond pure delivery. You will work in close partnership with Product and UX, playing a key role in discovery, defining technical direction, and taking clear ownership of outcomes across complex, multi?dependency environments. Key Responsibilities. Work collaboratively with Product Managers and UX Designers during discovery to translate user needs into feasible, high?quality technical solutions.. Actively participate in user research,...

Outside IR35 Contract Software Engineer (React & AWS) Leading Media Organisation Digital Platform (UI & UX?Led) Location: Hybrid (London or Manchester) Day Rate: Competitive Contract Length: 6 Months + Overview We are working with a leading UK media organisation to engage an experienced Contract Software Engineer to support the development of a large?scale, user?centric digital platform. The platform is UI and UX?heavy, highly visible, and used by millions, sitting at the intersection of content, information, and media. This role goes beyond pure delivery. You will work in close partnership with Product and UX, playing a key role in discovery, defining technical direction, and taking clear ownership of outcomes across complex, multi?dependency environments. Key Responsibilities * Work collaboratively with Product Managers and UX Designers during discovery to translate user needs into feasible, high?quality technical solutions. * Actively participate in user research,...

Lead Test Engineer £450 per day Outside IR35 6-month contract (initially) Remote working (UK-based) Skills and Experience: Proven experience as a Test Lead, QA Lead, or Senior Test Engineer in agile delivery environments Strong track record of defining and executing test strategies in fast-paced, pre-production settings Hands-on expertise in automated testing, with strong preference for Playwright Extensive experience in integration testing, API testing and system validation Practical knowledge of application security testing, including OWASP principles and security scanning tools Experience testing AI and machine learning products Strong understanding of modern software development and CI/CD practices Knowledge of accessibility testing and inclusive design principles Familiarity with WCAG 2.2 standards Experience using accessibility testing tools such as axe, WAVE or similar Opportunity to work on genuinely...

Mid-Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS | AI Agentic Workflows expertise | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract   We’re hiring multiple Senior Go Backend Engineers (contractors) to join a large-scale public sector transformation programme delivered by a highly regarded product consultancy.   This work is focused on moving critical systems away from a legacy C# ecosystem into a modern, scalable, cloud-native architecture.   You’ll be joining cross-functional teams responsible for building resilient backend services that support high-impact, user-facing products used at national scale.   This is a 6-month initial contract, ideal for engineers who enjoy working on meaningful systems, solving complex migration challenges, and delivering production-grade backend services, fast.   The Role | Mid-Senior Backend Engineer, Go (Contract) | C#...

Outside IR35 Full Stack Software Developer - LLM/AI, Farnborough, Hybrid, £500-550 per day Outside IR35 Long term contract opportunity for a full stack engineer with experience in LLM. This is for a defence consultancy and security clearance (SC) would be needed prior to engagement. Due to the nature of the role, 2-3 days per week in Farnborough is needed. Key skills required Full stack development experience (Mid-senior level) PostgreSQL Python React JSON LLM and other AI Approaches - GenAI If you have worked in a security cleared environment, and skilled with LLM and AI Approaches, please apply.

Lead Test Engineer £450 per day Outside IR35 6-month contract (initially) Remote working (UK-based) Skills and Experience: Proven experience as a Test Lead, QA Lead, or Senior Test Engineer in agile delivery environments Strong track record of defining and executing test strategies in fast-paced, pre-production settings Hands-on expertise in automated testing, with strong preference for Playwright Extensive experience in integration testing, API testing and system validation Practical knowledge of application security testing, including OWASP principles and security scanning tools Experience testing AI and machine learning products Strong understanding of modern software development and CI/CD practices Knowledge of accessibility testing and inclusive design principles Familiarity with WCAG 2.2 standards Experience using accessibility testing tools such as axe, WAVE or similar Opportunity to work on genuinely innovative AI/ML...

Mid-Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS | AI Agentic Workflows expertise | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Go Backend Engineers (contractors) to join a large-scale public sector transformation programme delivered by a highly regarded product consultancy. This work is focused on moving critical systems away from a legacy C# ecosystem into a modern, scalable, cloud-native architecture. You’ll be joining cross-functional teams responsible for building resilient backend services that support high-impact, user-facing products used at national scale. This is a 6-month initial contract, ideal for engineers who enjoy working on meaningful systems, solving complex migration challenges, and delivering production-grade backend services, fast. The Role | Mid-Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS | AI Agentic Workflows expertise...

Mid-Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS | AI Agentic Workflows expertise | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Go Backend Engineers (contractors) to join a large-scale public sector transformation programme delivered by a highly regarded product consultancy. This work is focused on moving critical systems away from a legacy C# ecosystem into a modern, scalable, cloud-native architecture. You’ll be joining cross-functional teams responsible for building resilient backend services that support high-impact, user-facing products used at national scale. This is a 6-month initial contract, ideal for engineers who enjoy working on meaningful systems, solving complex migration challenges, and delivering production-grade backend services, fast. The Role | Mid-Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS | AI Agentic Workflows expertise...

Role Type: Contract Title: Senior C# Engineer Client: Established Financial Institution Rate: Up to £600 P/D! Location: London/Hybrid 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 tech! If this sounds like your next contract and you...

Software Engineer (PHP, Playwright, k6) - Mobile RASP & API Security Gateway Pay Rate: £500-£550 (Outside IR35) Duration: 6 months' Working arrangement: Once a month - Bristol We are currently working with an established financial services organisation operating in the investment and wealth management sector. The organisation is strengthening its mobile and API security capabilities and is seeking an experienced Contract Engineer to help deliver and operationalise a Mobile RASP and API Security Gateway solution. This role is delivery-focused and hands-on, working across backend engineering, testing, security, and operational readiness in a regulated environment. Responsibilities Design, develop, and maintain secure PHP-based backend services and APIs Build and maintain automated end-to-end and functional test suites using Playwright or similar tools Execute and analyse performance and load tests using k6) to identify reliability, performance, and scalability risks...

Software Engineer (PHP, Playwright, k6) - Mobile RASP & API Security Gateway Pay Rate: £500- £550 (Outside IR35) Duration: 6 months ' Working arrangement: Once a month - Bristol We are currently working with an established financial services organisation operating in the investment and wealth management sector. The organisation is strengthening its mobile and API security capabilities and is seeking an experienced Contract Engineer to help deliver and operationalise a Mobile RASP and API Security Gateway solution. This role is delivery-focused and hands-on, working across backend engineering, testing, security, and operational readiness in a regulated environment. Responsibilities Design, develop, and maintain secure PHP-based backend services and APIs Build and maintain automated end-to-end and functional test suites using Playwright or similar tools Execute and analyse performance and load tests using k6) to identify reliability,...