Principal Software Engineer jobs in Greater London

You will have the opportunity to develop and enhance your skills and knowledge, with the potential to lead into more senior positions within a global business

We are seeking an experienced Principal Software Engineer with a strong background in backend and cloud-based development, who has also taken on technical leadership responsibilities. This role involves leading the design and development of scalable systems, mentoring engineers, and ensuring high standards of architecture and code quality across projects. Ensure you read the information...

You will own the architecture, technical roadmap, and delivery outcomes that enable Affirm’s international expansion, with particular focus on compliance and localization, cross-border trade, and country-specific payments and KYC requirements.

Principal Software Engineer Location: London - 1x a month Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting...

Principal Software Engineer Cloud Engineering Scale-up c£100k North Scout are partnered with a fast-growing cloud engineering business that’s doubled revenues, expanded its technical team, and earned a strong reputation for delivering complex cloud programmes with pace and precision. They’re looking for a Principal Software Engineer to take a leading role across architecture, design and...

Principal Software Engineer (Frontend Focused) | ~£150K | AI Learning Platform | London Hybrid Ready to apply Before you do, make sure to read all the details pertaining to this job in the description below. I’m working with a rapidly scaling AI start-up founded by three Cambridge alumni (ex-Google, Amazon, YouTube) on a mission to make learning effortless and fun. Their platform uses AI and...

Principal Software Engineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London Take the next step in your career now, scroll down to read the full role description and make your application. **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to...

Principal Software Engineer – Platform Architecture & ScalabilityWe’re looking for a Principal Software Engineer to shape the next generation of our platform architecture as we scale to meet increasing demand from some of the world’s leading engineering companies. This is a high‑impact, hands‑on technical leadership position where you’ll partner closely with the VP of Engineering to define...

Overview Senior Principal Software Engineer (REMOTE)Upbound is the company behind Crossplane, the open source project which started the control plane revolution in the cloud native community. Upbound is redefining how modern infrastructure is built. As the creators of Crossplane and the pioneers of the Intelligent Control Plane, we are leading the shift toward agentic infrastructure : platforms...

Principal Software Engineer - Full Stack Principal Software Engineer - Full Stack 1 day ago Be among the first 25 applicantsGet AI-powered advice on this job and more exclusive features.In just a few short years, monday.com has evolved from a fast-growing startup into a publicly traded, multi-product company and one of the world’s fastest-growing SaaS businesses. Our journey is defined by...

Senior/Principal Recruitment Consultant | Software Engineering | Fully Remote or Hybrid London5 days ago Be among the first 25 applicants Direct message the job poster from Owen Thomas | Pending B Corp If you’re reading this, chances are you’re not completely satisfied with where you are. Which for us, was enough to want to make a change. At Owen Thomas, we’re breaking away from the typical...

Principal Software Engineer .NET £90,000-£100,000 Remote (UK) Are you passionate about writing clean, scalable code and ready to shape a platform used by merchants across the globe? We're working with a fast-growing global payment processing platform that’s scaling rapidly after a major acquisition. They are building a high-performance, merchant-first ecosystem that prioritises quality,...

About The Role Deadline for applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations. We believe great engineering happens when teams...

You will architect and implement critical solutions that power real-time trading decisions, while mentoring teams and driving client relationships at the highest level.

You will go toe-to-toe with senior engineering stakeholders in fast-paced trading environments, influencing architecture, operating models, and data strategy.

Principal Software Engineer (Java) London – 1 day a week onsite Join a FinTech Powering the Future of Payments Are you a seasoned individual contributor looking for a step up into a senior position within a high-performing team within the world of Banking/Payments? Are you passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that...

Principal Front Office Developer - Trade Capture, Pricing, Risk, and STP You will be: - Accountable for the successful software delivery from inception to deployment for the complete Front Office Derivatives Technology Stack - Deliver key strategic business goals by identifying systems changes that support revenue generation and regulatory reporting for the Front Office businesses, focusing on...

You will have the opportunity to develop and enhance your skills and knowledge, with the potential to lead into more senior positions within a global business Why BAE Systems? This is a place where you'll be able to make a real difference. You'll be part of an inclusive culture that values diversity of thought, rewards integrity, and merit, and where you'll be empowered to fulfil your potential.

Principal Software Engineer Ensure you read the information regarding this opportunity thoroughly before making an application. Location: London - 1x a month Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation...

Principal Software Engineer (Java) London – 1 day a week onsite Join a FinTech Powering the Future of Payments Are you a seasoned individual contributor looking for a step up into a senior position within a high-performing team within the world of Banking/Payments? Are you passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that...

Principal Software Engineer Location: London - 1x a month An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues...