Principal Software Engineer
19 hours ago
Principal Software Engineer | Front End (React) | London, Hybrid Our client is a forward-thinking global firm redefining the future of finance through technology. They are looking for a Principal React Engineer who can set the technical direction for the front-end, champion best practices, and still enjoy being hands-on. Someone who obsesses over clean design, performance and scalability, and is comfortable leading from the front. The Opportunity You’ll be the go-to technical leader for front-end engineering within a cross-functional product team, shaping the architecture, tooling and standards for user-facing applications used by investment professionals across the business. The team is currently re-architecting its stack to be fully cloud-native (AWS), with React and TypeScript on the front end and Python-based services on the backend . You’ll work in a culture that values engineering excellence – TDD, clean code, pair programming, thoughtful code reviews – and your voice will carry weight in how the platform evolves. What You’ll Do Lead the design and development of complex, high-performance React applications using React, TypeScript and modern front-end libraries. Define and drive front-end architecture, standards and best practices , ensuring quality, consistency and reusability across products. Collaborate closely with Backend, UX and Product to refine user journeys, ensuring interfaces are intuitive, performant and accessible. Partner with portfolio managers, researchers and analysts to translate complex domain problems into elegant, user-focused solutions. Mentor and coach other engineers, raising the bar on code quality, testing and delivery discipline. Contribute to the evolution of a cloud-native architecture on AWS , working closely with backend and platform teams. 📍 Location: London City, hybrid working (3 days per week in the office) 💷 Package: Highly competitive base + bonus + benefits What You’ll Bring Significant experience building large-scale React and TypeScript applications , ideally in complex or data-heavy domains. Experience within Financial Services environments is highly advantageous e.g. Investment banking, trading, asset management, etc. Deep knowledge of React, TypeScript, state management (e.g. Redux or similar), Apollo Client and GraphQL/REST APIs . Experience in cloud-native environments (AWS or Azure), and how front-end and backend services fit together in distributed systems. Strong understanding of front-end performance optimisation , including data streaming (WebSockets, server-sent events, chunked responses). Solid experience with testing strategies (unit, integration, E2E) – Playwright, Cypress or similar tools a plus. Bonus points for experience with design systems (e.g. Material UI) and data visualisation libraries. About You A hands-on technical leader who’s comfortable making architectural decisions and backing them up with code. Confident owning front-end initiatives end-to-end, from discovery and design through to delivery and optimisation. Collaborative and pragmatic - able to work across product, UX and engineering teams without ego. Curious, always learning, and keen to improve both the codebase and the way the team works. If you are interested in this Principal Software Engineering Role , please respond to this advert directly with your updated CV or email it to chantelle.smith@sourcegroupinternational.com
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Principal Software Engineer
2 weeks ago
London, United Kingdom Software Development & Engineering Full time🔥 Principal Software Engineer - Lead the Future of UK GovTech Innovation💰 Up to £100,000 + Premium Benefits Package 🏡 Remote-First | Just 1 Day Onsite Every 2 Weeks 🔐 SC Clearable | British Citizens Only 🚀 Where Technology Meets Purpose Are you ready to lead engineering efforts that directly impact national security, public services, and...
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Principal Software Engineer
1 day ago
City Of London, United Kingdom Monolith Full timeJoin to apply for the Principal Software Engineer role at Monolith We're seeking a Principal Software Engineer to lead the architectural evolution of our platform as we scale to meet growing demand from the world's largest engineering companies. This is a hands‑on technical leadership role where you'll drive critical architectural initiatives while...
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Principal Software Engineer
1 day ago
City Of London, United Kingdom Premier Group Full timeOverviewI'm working with a software company that's looking for a Principal Software Engineer to join their team. They have developed a product that utilises data analytics and machine learning to optimise inventory data, built primarily on Java. This is a key role where you'll take ownership of the technical roadmap and manage solutions architecture, acting...
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Principal Software Engineer
1 day ago
City Of London, United Kingdom Gram Games Full timeJoin to apply for the Principal Software Engineer role at Gram Games3 days ago Be among the first 25 applicantsJoin to apply for the Principal Software Engineer role at Gram GamesGet AI-powered advice on this job and more exclusive features.Who We AreGram Games is the studio behind popular titles like 1010!, Six!, Merge Dragons!, and Merge Magic!, with more...
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Principal Professional Services Engineer
3 days ago
City Of London, United Kingdom Perforce Software Full timePrincipal Professional Services EngineerJoin to apply for the Principal Professional Services Engineer role at Perforce SoftwarePerforce is a community of collaborative experts, problem solvers, and possibility seekers who believe work should be both challenging and fun. We are proud to inspire creativity, foster belonging, support collaboration, and...
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Principal Software Engineer
3 days ago
City Of London, England, United Kingdom Fruition Group Full time £1,140,000 - £1,440,000 per yearPrincipal Software EngineerLocation: London - 1x a monthSalary: £95,000 - £120,000 + equity + benefitsAn 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...
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Principal Software Engineer
2 weeks ago
Greater London, United Kingdom Free-Work UK Full timePrincipal Software Engineer – Free-Work UK Join to apply for the Principal Software Engineer role at Free-Work UK. Base pay range Job Title: Principal Software Engineer Location: Great Baddow – We offer flexible working arrangements, part time & accruing hours available. Please let us know if you would like to discuss these options. Salary: Up to...
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Principal Software Engineer
3 weeks ago
Greater London, United Kingdom TPXImpact Holdings Plc Careers Full timeAbout The RoleDeadline for applications: 11:59pm on 31st October 2025Were 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...
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Principal Software Engineer
2 weeks ago
Greater London, United Kingdom TPXImpact Holdings Plc Careers Full timeAbout 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...
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Principal Software Engineer
1 day ago
London, United Kingdom Harnham Full time**PRINCIPAL SOFTWARE ENGINEER** **£90,000 - £100,000** **LONDON - HYBRID** **TECH STACK: Java, Kotlin, Typescript, Javascript, Vue.js, Github, Horoku** A successful rapidly growing start-up is hiring a Principal Software Engineer to join & lead their expanding London-based team. This company is working with a lot of personal data. They are seeking a...
