51 to 75 of 100 Senior Software Engineer Jobs in London

Fastest Growing Start-up in the UK | Defense | Senior Software Engineer | Rust We are partnered with one of the UK's fastest growing start-ups. They are a very technically focused group building cutting-edge decision making technology. The company's founding team has real pedigree, with … just over two years, and already have a lot of customers in the UK. On-site | London Up to 150,000 + Equity Senior/Principal Software Engineers: They're looking to add Senior/Principal Engineers to their team. The team are open to hiring pure ...

Senior Backend Engineer Location: London, Hybrid (2 Days Onsite) Salary: £90,000 - £105,000 + Competitive bonus We're working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time … operations, connecting users with seamless, intelligent technology solutions. They are looking for a Senior Backend Engineer with deep expertise in JVM technologies to help scale and enhance their high-performance systems. There will be a requirement to use Kotlin moving forwards! This is an opportunity to work with ...

Senior Software Engineer | Remote | £60,000 - £70,000 | C# | .Net | React | Azure | Microservices | .NetCore | .Net Developer | Full stack Developer | Opus have exclusively partnered with a brilliant Saas company that harness technology to build Software within the Proptech industry. They’re currently looking for a Senior Developer to come on board and work across greenfield projects and adding new functionality to existing systems. As a Senior Developer you will be part of a Development team of 5 where you will be building API’s and building full stack applications. On top of this ...

Senior Software Engineer | Remote | £60,000 - £70,000 | C# | .Net | React | Azure | Microservices | .NetCore | .Net Developer | Full stack Developer | Opus have exclusively partnered with a brilliant Saas company that harness technology to build Software within the Proptech industry. They’re currently looking for a Senior Developer to come on board and work across greenfield projects and adding new functionality to existing systems. As a Senior Developer you will be part of a Development team of 5 where you will be building API’s and building full stack applications. On top of this ...

excellent opportunity to join one of the UK's leading software consultancie s , renowned for its strong presence in the public sector while also delivering private and SC-cleared projects. As a Senior Software Engineer, you will look to design, build, and deliver high-quality software … architecture, mentor junior engineers, and collaborate with cross-functional teams across public and private sector programmes. Key responsibilities include: * Designing and developing scalable, secure software solutions * Contributing to architectural decisions and technical direction * Mentoring junior engineers and promoting best practices * Working closely with Product, UX, DevOps, and QA teams ...

Purpose of the Position As a Senior Software Engineer, you will be part of a cross-functional, service-oriented team, working on extending and maintaining our Affiliate Marketing platform. You design and build reliable services by writing clean, secure, and well-tested code, following modern engineering best … evolve over time, offering opportunities to gain deeper knowledge and experience within the online and affiliate marketing domain. Skills & Expertise 6+ years of professional software engineering experience Strong foundation in OOP and comfort working with multiple programming languages, ideally incl. Java/Spring Passion for clean, maintainable code with ...

looking for a Senior Software Engineer to join a growing team building smart, scalable tools used by professionals across a range of industries. You'll work onsite in London, helping shape robust backend services and responsive user experiences using React, NextJS and NodeJS. What ...

excellent opportunity to join one of the UK's leading software consultancie s , renowned for its strong presence in the public sector while also delivering private and SC-cleared projects. As a Senior Software Engineer, you will look to design, build, and deliver high-quality software ...

healthcare staff rather than adding burden. MMR is a well-funded company with long-term investors and a strong financial foundation. Our hardware and software teams have developed a fully functional medical robotic platform that has successfully completed animal trials. As we move into the next phase … with a focus on safety, reliability, manufacturability, and scalability, preparing our technology for deployment in hospitals worldwide. About the Role We are seeking a Senior Software Engineer in Test with strong Python experience and a background in testing embedded systems. This role focuses on verification ...

operations are conducted, building systems that are safer, smarter, and dramatically more environmentally responsible. Location: London or Porto The Role We’re seeking a Senior Software Engineer to design, build, and maintain backend containerised services that power our scalable edge‐compute platforms. You’ll work closely with … Software Team Lead and collaborate across multidisciplinary engineering teams, providing technical leadership while remaining hands‐on with complex systems. What You’ll Do Build production‐grade software using .NET C#, Python , and modern backend technologies Design and prototype services using containerised microservices Apply and challenge engineering best practices ...

them, they've also backed Moneybox, Exotec, Thought Machine and many other high-growth start-ups. About the Role We're looking for a Senior Software Engineer to lead our engineering team. You'll set the technical direction, make key architecture decisions, and help hire and build … team as we grow. This is a senior role - you'll have significant ownership over how Keith's platform is built, deployed and secured. You Will: Design and own the architecture of Keith's platform - the state machine, workflow engine, API layer and data model that orchestrate every transaction ...

Software Engineer £700 per day (inside ir35) Contract until Jan 2027 with 1 year extension expected. Responsibilities Develop quality software and web applications in Python and C# Process file automation - Extracting, Loading and Transforming workloads Analyse and maintain existing software applications Design highly scalable, testable code ...

Java/Microservices/API design/LLMs/AI/Claude Code/Copilot Role: Senior Software Engineer Company: Financial Services Location: London - Hybrid 3 days per week Salary: up to £120,000 Join a Service Modernisation team driving AI-first software development in financial ...

data, legal and ESG insights, all delivered at speed to some of the biggest names in banking, asset management and law. They need a Senior Software Engineer to join a cross-functional product team and help shape the backbone of their platform. What you'll be doing … Python/FastAPI stack, working on everything from data pipelines and API design to ML/AI service integration. You'll be a proper senior IC, running code reviews, mentoring engineers, and getting involved early in research and experimentation, not just building to spec. The stack Python (FastAPI, Flask ...

currently working with a long-standing client of Searchability who are looking for a Senior Software Engineer (C++/GUI) to join their team. 💰 Up to £65,000 📍 Hybrid role – Enfield The company are a world leader in the development, manufacture and supply of maritime navigation … radar systems, working on highly complex, real-world engineering products used globally. The role would give you the opportunity to work across the full software development lifecycle on innovative systems, with a strong focus on C++, GUI development and modern engineering practices. They’re also keen to bring ...

trajectory is ambitious, from zero to seven figures in recurring revenue within its first year and plus over £20million in funding already!! As a Senior Software Engineer, you’ll join a small, high calibre team where ownership is everything. You’ll work primarily on the backend, integrating … next tech unicorn, together, in the same room, ask the big players. What you’ll need to succeed: Strong experience building production quality software (Java, TypeScript, React or Python) Curiosity and adaptabilit y: you learn new technologies quickly and apply them effectively Hunger and drive: you’re comfortable working ...

Backend Engineer 📍 London, England (Hybrid) 💼 Permanent My client is looking for a Backend Engineer to join a growing engineering team building modern, cloud-native products that directly impact customer experience and business growth. This is a hands-on role for someone who enjoys solving complex technical problems, collaborating … ownership and cares deeply about delivering quality solutions. You’re naturally curious about modern engineering practices and emerging technologies, particularly how AI is shaping software development, but you apply these tools thoughtfully and pragmatically. You’re comfortable operating in fast-paced environments and making sound decisions even when there ...

Level: 9 UK Wide We are looking for a Senior Software Engineer who will be responsible for designing, developing, and deploying high-quality software solutions. You will work on complex software projects, contributing to the architecture, development, and improvement of software systems click apply ...

Senior/Principal Software Engineer Application Deadline: 31 May 2026 Department: Software Engineering Employment Type: Permanent Location: London (Hybrid) Compensation: £70,000 - £100,000/year Description Please note: This role requires applicants to hold active, or recently active, SC or DV clearance. This role also … impact systems, the kind that have to be secure, scalable, and actually usable by the people who rely on them. We’re looking for Senior and Principal Engineers who want to shape meaningful systems, influence technical direction, and work alongside capable people who care about doing the job properly. ...

looking for a Senior Embedded Software Engineer to develop advanced, real-time software solutions for complex systems. You will be responsible for delivering software from initial concept through to fully verified solutions, working across the full development lifecycle. Key Responsibilities Design, develop, and maintain high … quality software using best engineering practices Take ownership of software development from requirements through to verification and validation Support and enhance existing software in line with evolving project and customer needs Contribute to system architecture, design reviews, and technical decision-making Collaborate with multidisciplinary teams including systems ...

Principle and Senior Backend Software Engineer (.NET) Location: North London/Hertfordshire Type: Permanent | Strong Salary + Bonus + Equity Right to Work: UK work eligibility required (no sponsorship) What We’re Looking For We’re searching for a highly skilled Principle and Senior Backend Engineer ...

Ruby on Rails Engineers | Lead Engineer + Software Engineers Location: Flexible across the UK | London attendance required twice per month We are currently supporting a leading FTSE 100 organisation undergoing significant digital transformation, looking to strengthen its Home Finance Product Engineering team with three permanent hires … Lead Engineer • 2 x Software Engineers These roles sit within a product engineering function responsible for the platforms that support mortgage origination and servicing capabilities. This is an opportunity to work on large-scale, business-critical systems while helping shape the future of a modern, engineering-led environment. ...

Senior Java Engineer/SRE London (Hybrid) The company A well-established global fintech business operating large-scale trading platforms across multiple asset classes including equities, leveraged products, futures, options, and digital assets. Their technology supports a significant international client base and processes high volumes of real-time … engineering, platform resilience, and product growth, with a strong focus on modern systems, high standards, and sustainable delivery. The role This is a senior engineering opportunity within a specialist Site Reliability Engineering team focused on performance, uptime, and operational excellence across a business-critical trading platform. The role combines ...

Senior Full Stack Engineer London, Hybrid, Permanent We are representing a London-based technology venture building AI platforms to transform how enterprise leaders navigate uncertainty. This is a core engineering role within a senior, lean team. You will be building a platform that goes far beyond standard … SaaS dashboards, focusing instead on high-dimensional data visualization and complex logic systems. The Mission As a Full Stack Engineer, you are a system generalist. You will be responsible for the entire lifecycle of a feature—from the database schema and service logic to the interactive frontend experience. Product ...

Embedded Software Engineer | UK (Hybrid) My client is an innovative technology company developing advanced hardware and networking solutions for high-performance computing environments. Theyre looking for Software Engineers to build embedded and host software for high-speed systems, working closely with hardware teams to deliver production … ready solutions from early prototypes. Responsibilities Define software architecture with cross-functional teams Develop embedded software for network interface hardware Linux PCIe driver development Build network control and monitoring tools (server/client) Enhance DevOps and CI/CD pipelines Requirements Strong embedded software development experience Experience ...