25 software engineer jobs found

Senior Software Engineer - Kotlin £550-£650 per day | Outside IR35 Hybrid | London (3 days onsite) A leading UK financial services organisation is seeking a Senior Software Engineer to play a central role in a large-scale platform transformation programme. The business is rebuilding a critical part of its digital infrastructure to support a broad range of transaction methods and channels across both in-person and digital environments. This is hands-on Back End engineering at scale, with real ownership and direct exposure to architecture decisions from day one. Key Responsibilities as a Senior Software Engineer: Design and build Kotlin Back End services for a new payments platform Own the architecture and design of key components, taking high-level requirements and turning them into structured, deliverable backlogs Write clean, well-tested, production-ready code that the team can rely on Work closely with Product and Engineering to break down complex...

Senior Software Engineer - Kotlin & Coroutines. £500/day LTD CO OUTSIDE IR35. 100% REMOTE. An interest in AI (Agentic AI, AI tooling, Claude, Codex or Co-Pilot) highly advantageous but not essential. We are looking for a Senior Backend Engineer (Kotlin & Coroutines essential) to build the integrations that connect AI companion with senior care and hospital software platforms. In this role, you will design, build, and maintain robust Back End services and integrations that enable seamless data exchange between the company and partner systems. You'll take end-to-end ownership of integration projects-from discovery and architecture through implementation, deployment, and continuous improvement. Key Responsibilities for the Kotlin & Coroutines Developer are: Design, develop, and maintain integrations between my clients platform and third-party healthcare and senior care software systems. Build scalable, secure, and maintainable Back End services and APIs using...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract click apply for full job details

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with Product Managers, Engineers and technical...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with Product Managers, Engineers and technical...

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We 're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You 'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with...

Candidate Specification - SourceWise Solutions Staff Software Engineer (Backend / Platform) This is a remote contract role with occasional visits to the client's office when required. The engagement is Outside IR35, offering a daily rate of £500 About SourceWise SourceWise Solutions partners with innovative global technology companies to build high-performing engineering teams. We connect experienced engineers with organisations building modern, scalable software platforms. About the Opportunity This Staff Software Engineer role is with one of our international technology clients. You will influence architecture, engineering practices, and technical direction while solving complex, high-impact problems. Key Responsibilities · Lead architecture and design of scalable distributed systems. · Own complex cross-team engineering challenges. · Drive technical strategy and influence engineering decisions. · Improve platform scalability, reliability,...

Candidate Specification - SourceWise Solutions Staff Software Engineer (Backend / Platform) This is a remote contract role with occasional visits to the client's office when required. The engagement is Outside IR35, offering a daily rate of £500 About SourceWise SourceWise Solutions partners with innovative global technology companies to build high-performing engineering teams. We connect experienced engineers with organisations building modern, scalable software platforms. About the Opportunity This Staff Software Engineer role is with one of our international technology clients. You will influence architecture, engineering practices, and technical direction while solving complex, high-impact problems. Key Responsibilities · Lead architecture and design of scalable distributed systems. · Own complex cross-team engineering challenges. · Drive technical strategy and influence engineering decisions. · Improve platform scalability, reliability, and maintainability. ·...

🚨 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...

🚀 Job Opportunity: Senior C# Quantitative Risk Developer | Capital Markets Technology Location: London Type: Full-time / Contract Rate: £800 p/d (Outside IR35) Client: Leading Global Investment Bank Hybrid: 1 day per week in the office Are you ready to be at the forefront of technology and finance? Our client, a top-tier investment bank, is looking for a Senior C# Quantitative Risk Developer to join their high-impact Capital Markets Technology team in London. This is a unique opportunity to bridge the worlds of quantitative analysis and software engineering—delivering cutting-edge solutions to drive pricing, risk management, and liquidity strategies in real-time trading environments. 🔍 About the Role As a Senior Quantitative Developer, you’ll collaborate closely with quantitative analysts, traders, and fellow technologists to develop and optimize core components of the bank’s pricing, risk and valuations infrastructure. You'll be responsible for...

Senior Operations Lead – Service Operations Transformation (Contract) Toyota Connected Europe (TCEU) · London (Hybrid) · Contract – Initial 3 months (extendable) Outside IR35 About the role: Our Operations function is at an important stage of its evolution. The department has an ambitious FY2026 plan to deliver: intelligent automation, AIOps, process excellence, stronger governance, workforce transformation into SRE/ARE-aligned engineering, and a new “Ops as a Product” operating model. To get there, we first need to stabilise and strengthen the current team's standards, ownership and ways of working. We are looking for an experienced, hands-on Senior Operations Lead to join on an initial 3-month contract to do two things in parallel: stabilise the current team, resetting standards, ownership and customer confidence, and begin its transformation into a modern, engineering-led operations capability. The initial term is 3 months, with the possibility of extension...

Senior Operations Lead – Service Operations Transformation (Contract) Toyota Connected Europe (TCEU) · London (Hybrid) · Contract – Initial 3 months (extendable) Outside IR35 About the role: Our Operations function is at an important stage of its evolution. The department has an ambitious FY2026 plan to deliver: intelligent automation, AIOps, process excellence, stronger governance, workforce transformation into SRE/ARE-aligned engineering, and a new “Ops as a Product” operating model. To get there, we first need to stabilise and strengthen the current team's standards, ownership and ways of working. We are looking for an experienced, hands-on Senior Operations Lead to join on an initial 3-month contract to do two things in parallel: stabilise the current team, resetting standards, ownership and customer confidence, and begin its transformation into a modern, engineering-led operations capability. The initial term is 3 months, with the...

Service Desk Engineer - London 3 month contract £350 - £375 p/d - outside IR35 Working with a well-known and public-facing organisation of circa 2000 IT end-users and multiple sites across the country, you'll be part of a small team supporting users and resolving technical issues spanning all end-user-computing, infrastructure, business systems, telephony etc. across multiple sites. You will be working within a small and friendly IT team of very capable individuals dealing with tickets logged from internal users and resolving or escalating when required. It's a busy environment where you'll be given the opportunity to rapidly progress your technical exposure. Responsibilities include logging of tickets and managing through to resolution (both hardware and software), and installation and configuration of new hardware, software, and services. You must have a solid understanding of helpdesk responsibilities, procedures, policies, and workflows and be able to work...

Service Desk Engineer - London 3 month contract £350 - £375 p/d - outside IR35 Working with a well-known and public-facing organisation of circa 2000 IT end-users and multiple sites across the country, you 'll be part of a small team supporting users and resolving technical issues spanning all end-user-computing, infrastructure, business systems, telephony etc. across multiple sites. You will be working within a small and friendly IT team of very capable individuals dealing with tickets logged from internal users and resolving or escalating when required. It 's a busy environment where you 'll be given the opportunity to rapidly progress your technical exposure. Responsibilities include logging of tickets and managing through to resolution (both hardware and software), and installation and configuration of new hardware, software, and services. You must have a solid understanding of helpdesk responsibilities, procedures, policies, and workflows...

Specialism Software Engineering, Platform Engineering, AI/ML Job type Contract Location London Rate £500 - £600 per day We are looking for a Senior Backend Engineer to join an early stage team that is actively reimagining software for an industry tech forgot. For decades, blue collar businesses have powered the backbone of everyday life while relying on fractured, legacy infrastructure. They sit on vast amounts of unstructured, highly valuable data locked inside on-prem databases, servers, and CSV dumps. Data that their teams simply don't have the tools to leverage. By pairing modern LLM breakthroughs with reliable backend engineering, our client is changing that, transforming amorphous legacy data into clear, actionable insights for nontechnical teams on the ground. Working directly alongside AI founders, you won't just write code; you will shape what modern data infrastructure looks like in this space. You'll take full ownership of the backend,...

We're looking for a hands-on Build/Deployment Engineer to support large-scale IT deployment projects within secure government environments. London (5 Days On-Site) Active SC Clearance Required Outside IR35 Essential Experience: Active SC Clearance 2nd Line Support/EUC/Tech Bar experience Windows 10/11 device builds and deployments Microsoft Intune Windows Autopilot SCCM/MECM ServiceNow or similar ITSM tool Strong troubleshooting skills across hardware and software Excellent customer-facing communication skills Responsibilities: Deploy and configure laptops and end-user devices at scale Deliver remote and face-to-face user onboarding sessions Support office-based and classroom-style deployments Troubleshoot deployment issues and provide user support Maintain accurate asset and ticket records Work closely with project and technical teams to ensure successful rollouts Desirable: Workspace ONE experience ITIL...

£650-700p/d | Outside IR35 | 6 months | Hybrid We're supporting a well-funded London AI start-up that's building machine learning products to solve complex, real-world problems at scale. They're entering an exciting growth phase and are looking for an experienced Machine Learning Engineer to help shape the next generation of the platform. This is an opportunity to join a highly technical team where you'll have genuine ownership over production ML systems, working closely with software engineers, data engineers and product teams to take models from research through to deployment. Key Responsibilities Designing, training and deploying machine learning models into production Building scalable ML pipelines and improving existing model performance Working alongside Data and Software Engineers to integrate models into customer-facing products Researching and evaluating new ML techniques where appropriate Monitoring model performance and driving continuous improvements...

ML Engineer (Early Career - Mid-level) New contract role | Immediate starter - Just in! Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes. Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months Start date: ASAP, Immediate starter Working Patterns: Full-time, 1 day p/w in London-offices. Person Specification: - Solid skills in Python, SQL and AWS. - Background in Software Engineering/Data Engineering | Previous Back End work is nice to have - Experience working with ML models (productisation, not just for research/prototyping) Nice to have: - A deeper understanding on ML Models/ML Data Science from an API perspective (GraphQL, gRPC, REST) - Start-up or HealthTech experience. This is an urgent requirement, please reach out ASAP to Adam Akhtar today (17th July) to...

Technical Project Manager/Scrum Master (Hands-on Development) - Hybrid London Start Date: August/September 2026 Duration: 3-6 months (Likely Extensions) Day Rate: £800-£900 per day (Negotiable) IR35 Status: Outside IR35 Location: London (Hybrid - Minimum 3 days per week onsite) Key Skills & Experience: Technical Leadership & Delivery Proven experience operating as a Technical Project Manager, Scrum Master or Technical Delivery Lead. Strong Agile delivery experience across multiple software development teams. Experience managing complex technical projects within Banking or Capital Markets. Comfortable managing both technical delivery and stakeholder expectations. Strong understanding of software development life cycle, Agile methodologies and engineering best practices. Hands-on Software Development: This is a hands-on technical role. Candidates must remain technically active and able to contribute directly to software development....

Location: London (Central)  Contract Length: 6 Months (minimum) Rate: £65 p/h (Outside IR35) Start Date: ASAP An exciting opportunity has arisen for an experienced Control Systems Engineer to join a leading systems integration team delivering automation solutions in the energy sector. You'll be responsible for developing and commissioning Siemens based control systems, supporting projects from software development through to site commissioning. This is an ideal opportunity for an engineer who enjoys technically challenging projects and is comfortable working both remotely and on customer sites. Key Responsibilities Design and develop PLC software using Siemens TIA Portal Configure Siemens HMI/SCADA systems where required Produce and modify functional design specifications Carry out software testing, FAT and SAT activities Diagnose and resolve technical issues during commissioning Ensure projects are delivered safely, on time and to specification Expereince...