133 software engineer jobs found

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and E-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: Building and improving pricing, quote-caching and availability services Designing resilient APIs and integration patterns Tackling latency, performance and infrastructure cost challenges Managing the trade-off between pricing freshness and cache efficiency Improving observability through monitoring, tracing and meaningful metrics Working alongside teams responsible for third-party integrations and booking systems Using AI coding tools as part of your day-to-day engineering workflow What...

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and e-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: • Building and improving pricing, quote-caching and availability services • Designing resilient APIs and integration patterns • Tackling latency, performance and infrastructure cost challenges • Managing the trade-off between pricing freshness and cache efficiency • Improving observability through monitoring, tracing and meaningful metrics • Working alongside teams responsible for third-party integrations and booking systems • Using AI coding tools as...

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and E-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: Building and improving pricing, quote-caching and availability services Designing resilient APIs and integration patterns Tackling latency, performance and infrastructure cost challenges Managing the trade-off between pricing freshness and cache efficiency Improving observability through monitoring, tracing and meaningful metrics Working alongside teams responsible for third-party integrations and booking systems Using AI coding tools as part of your day-to-day engineering workflow What...

AI SOFTWARE ENGINEER - DV CLEARED BRAND NEW OUTSIDE IR35 CONTRACT OPPORTUNITY AVAILABLE WITH A LEADING NATIONAL SECURITY CONSULTANCY FOR AN AI SOFTWARE ENGINEER Contract opportunity for an AI Software Engineer Outside IR35 Day rate up to £650 Hybrid role - London Must hold active UKSV DV clearance To apply please email or call WHO WE ARE? We are working with a specialist consultancy delivering cutting-edge AI and software solutions into the UK National Security and Defence sector. Due to continued growth and the expansion of several mission-critical programmes, we are looking for an experienced AI Software Engineer to join a high-performing engineering team in London. WHAT WILL THE AI SOFTWARE ENGINEER BE DOING? You will be designing and building AI-enabled software systems that support complex operational environments. The role will involve developing scalable backend services, integrating machine learning models into production...

Back End Software Engineer - 6 months - Glasgow - Outside IR35 Day rate - Circa £480 Harvey Nash's public sector client are currently looking to recruit a Back-End Software Engineer to join their team based Glasgow/Remote for an initial 6-month period. Main Duties: Work across technical teams formed of supplier, contract and permanent resource Develop new features in a secure way in line with industry click apply for full job details

Java Developer / Software Engineer - Design & Build Fintech Product / Banking - Spring Boot, Claude/Codex also essential. *YOU MUST HAVE BEEN INVOLVED IN DESIGN, ARCHITECTURE AND BUILD OF ANY FINTECH PRODUCT* for e.g. Current Account OR SAVINGS OR ISA's OR Fixed Term Deposits, Lending, Mortgages etc. £600-£650/DAY OUTSIDE IR35 PAY. Our Fintech Challenger Bank client based in Central London seeks a dynamic, eager to learn and technically astute Java Software Engineer who has extensive experience in Designing & Building a Payment Product *NOT PAYMENT PLATFORM* so the ideal candidate will come from for e.g. a Challenger Bank or Fintech Payment Product Company. STRONG skills in Java, Spring Boot, AI (Claude or Codex), working in a Fintech Payment domain. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & DESIGN & BUILD PAYMENT PRODUCT EXPERIENCE WITH JAVA, SPRING & STRONG AI! Our client is hiring a hands-on SENIOR Software Engineer / Java...

Software Engineering Contractor (Outside IR35) Location North of England (Office near Leeds with a mix of on-site and remote working) Occasional travel within Europe may be required. Contract Outside IR35 Long-term opportunity with the potential for a relationship lasting 5+ years Initial engagement on a competitive day rate while both parties become familiar with the project with future work delivered through fixed-price work packages with agreed delivery timescales The Opportunity We're looking for an experienced Software Engineering Contractor to support the development of advanced software for mobile defence platforms. This is a varied role covering embedded systems, user interfaces, networking, automation and software assurance, working on projects that combine hardware and software in demanding operational environments. You'll have the opportunity to contribute throughout the full software lifecycle, from design and development through to testing, compliance and...

Software Engineer/AI Engineer Fintech & Payments Domain. £600-£650/day LTD CO OUTSIDE IR35 PAY 1-2 days onsite London. Our Fintech Financial Service/Banking & Payment Service Client based in Central London seeks a proactive, hands-on Senior Software Engineer & AI Engineer with Claude or Codex & Java Development skills, with a particular importance to solid expertise in Claude or Codex AI Tooling, Agentic AI, Java Development using Spring Boot within a Fintech Payment Domain setting. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & PAYMENTS & JAVA & STRONG AI! The ideal candidate MUST HAVE previous experience working in a startup/scaleup Fintech Financial Services environment. Any ISA product implementation/integration experience is an advantage but not essential. AI skills in Codex, Claude is highly sought as my client is looking for someone who is an AI Enthusiast. Our client is hiring a hands-on Software Engineer/Java Developer to support...

Senior Software Engineer - Outside IR35 - Contract (Energy) About the role We are looking for a Senior Software Engineer (ideally with some Data Engineering experience) to join our client team in the energy trading sector. End date is not certain, but likely to be December 2026 or early Q1 2027. We are looking for experience in the following technologies: Microsoft Azure ecosystem Understanding of networking & security options in Microsoft Azure Infrastructure-as-code (preferably Bicep) Python Experience in the below would also be beneficial: Azure DevOps (pipelines) SQL We generally spend 2 days per week on-site with the client in central London (Monday & Thursday). £500-600 per day outside IR35 Start date: 10/08/2026 End date: December 2026 or early Q1 2027 About Softwire Softwire is a leading UK technology and strategy consultancy. From enterprise to government, we help visionary organisations turn...

Back End Software Engineer - 6 months - Glasgow - Outside IR35 Day rate - Circa £480 Harvey Nash's public sector client are currently looking to recruit a Back-End Software Engineer to join their team based Glasgow/Remote for an initial 6-month period. Main Duties: Work across technical teams formed of supplier, contract and permanent resource Develop new features in a secure way in line with industry best-practices Provide production support and support on fixing application issues Identifying production and non-production application defects Train and knowledge share with colleagues Looking ahead for future opportunities or blockers, and ensuring decisions by teams align with the technical direction Identify operational improvements and work to ensure a stable service that can be enhanced Anticipate and mitigate against project challenges or risks Essential Skills: Technology knowledge - Demonstrable experience in the minimum of 4 Of the below: Particular...

ERP Integration Architect (Senior Software Engineer - Enterprise Integrations) - Contract - Outside Location: Remote (Europe) Contract: Full-time (40 hours per week) - Outside IR35 - Fully Remote About the Role: We're looking for an experienced ERP Integration Architect to join a global engineering team delivering enterprise integration solutions for large-scale customers click apply for full job details

Contract LabVIEW Software Engineer Rate: Up to £55 per hour - Outside IR35 Contract length: 3 months initially Location: Gatwick - Hybrid We're recruiting on behalf of a client for a Contract LabVIEW Software Engineer to review, improve and productionise an existing final test application for a thermal management controller product click apply for full job details

Back End Software Engineer - 6 months - Glasgow - Outside IR35 Day rate - Circa £480 Harvey Nash's public sector client are currently looking to recruit a Back End Software Engineer to join their team based Glasgow/Remote for an initial 6-month period. Main Duties: Work across technical teams formed of supplier, contract and permanent resource Develop new features in a secure way in line with industry best-practices Provide production support and support on fixing application issues Identifying production and non-production application defects Train and knowledge share with colleagues Looking ahead for future opportunities or blockers, and ensuring decisions by teams align with the technical direction Identify operational improvements and work to ensure a stable service that can be enhanced Anticipate and mitigate against project challenges or risks Essential Skills: Technology knowledge - Demonstrable experience in the minimum of 4 Of the below:...

Back End Engineer - Up to £490 Outside IR35 - Glasgow - 6 months (potential extensions) Hi there, Lorien are currently supporting a key public sector client in the search for experienced Back End Engineers to join a major digital transformation programme. This role offers hybrid working arrangements with attendance in Glasgow as required. This is an initial 6-month contract with strong extension potential up to 23 months total. It is paying up to £490 per day Outside IR35 Key Responsibilities Design, develop and maintain Java-based Back End services and applications Build and enhance Spring Boot microservices within a cloud-native environment Design and implement RESTful APIs and service integrations Develop, maintain and improve CI/CD pipelines and deployment processes Write clean, maintainable and well-tested code following engineering best practices Develop unit and integration tests to ensure application quality and reliability Support containerised...

ERP Integration Architect (Senior Software Engineer - Enterprise Integrations) - Contract - Outside Location: Remote (Europe) Contract: Full-time (40 hours per week) - Outside IR35 - Fully Remote About the Role: We're looking for an experienced ERP Integration Architect to join a global engineering team delivering enterprise integration solutions for large-scale customers. Whilst the title is ERP Integration Architect , this is a highly hands-on engineering role . We're looking for someone who enjoys designing and building integrations, developing APIs and solving complex technical challenges rather than producing high-level architecture alone. You'll be responsible for integrating ServiceNow, ERP platforms and other enterprise applications using a combination of integration technologies and bespoke software development. This role is ideal for someone who is equally comfortable using enterprise integration platforms and writing custom integration code when...

Contract LabVIEW Software Engineer Rate: Up to £55 per hour - Outside IR35 Contract length: 3 months initially Location: Gatwick - Hybrid We're recruiting on behalf of a client for a Contract LabVIEW Software Engineer to review, improve and productionise an existing final test application for a thermal management controller product click apply for full job details

ERP Integration Architect (Senior Software Engineer - Enterprise Integrations) - Contract - Outside Location: Remote (Europe) Contract: Full-time (40 hours per week) - Outside IR35 - Fully Remote About the Role: We're looking for an experienced ERP Integration Architect to join a global engineering team delivering enterprise integration solutions for large-scale customers. Whilst the title is ERP Integration Architect , this is a highly hands-on engineering role . We're looking for someone who enjoys designing and building integrations, developing APIs and solving complex technical challenges rather than producing high-level architecture alone. You'll be responsible for integrating ServiceNow, ERP platforms and other enterprise applications using a combination of integration technologies and bespoke software development. This role is ideal for someone who is equally comfortable using enterprise integration platforms and writing custom integration code when...

Senior Embedded Software Developer - Aerospace - Outside IR35 Contract, Hybrid (Gloucestershire) £depending on experience / expectations Aerospace, Embedded, ARM, Firmware, Software Leading aerospace company are seeking Senior Embedded Software Developer to support expanding project in controls and bare-metal engineering within cutting edge aerospace technologies. Experience: Circa 10+ years in the software development life cycle, including at least 5 years within aerospace (DO-178B/C) or another safety-critical domain. Skills Proficiency in embedded C, bare-metal programming with microcontrollers, and familiarity with MISRA C standards. Knowledge of software architecture, requirement analysis, requirement flow-down, and detail design. Solid understanding of software testing methods. Desirable Skills Knowledge of CAN, UART, SPI eand other communication protocols, Working knowledge of ARM microcontrollers, and ability to read basic electronic schematics. Experience...

🚨 Senior Playwright SDET | £700/day | Outside IR35 | Front Office Trading | London I'm working with a leading global investment bank looking to hire an exceptional Playwright SDET to join their Front Office Derivatives Technology team. This isn't your typical automation role. You'll be embedded within a high-performing engineering team, working directly alongside developers on a strategic front end trading platform. The rate reflects the calibre of engineer they're looking for. 💰 Package £700 per day Outside IR35 12-month rolling contract 1 day per week in the London office What they're looking for This role is suited to a highly technical SDET who is passionate about automation and enjoys writing production-quality code. You must have: ✅ Strong commercial experience with Playwright ✅ Excellent coding skills in JavaScript and TypeScript ✅ Experience building and maintaining automation frameworks ✅ Previous experience working on...

Principal Software Developer, AI Integration, C#, £550 day rate, Outside IR35, Reading, COR7630 We're looking for an experienced Principal Software Developer to join a long-term contract with an initial 3-month term and a strong likelihood of extension up to 18 months. This role is based in Reading, with three days per week onsite, and offers a day rate of up to £550 , outside IR35. As a Principal Software Developer, you'll play a key role in driving the adoption of AI within a software engineering team. Working closely with developers, you'll help integrate AI-powered tools and agentic technologies into the development lifecycle, improving productivity and modernising engineering practices. What's required of the Principal Software Developer? Strong commercial experience developing software with C# and .NET Experience leading or supporting the adoption of AI within a software development team Knowledge of AI-assisted development tools, such as Claude, GitHub Agents,...