Principal Software Engineer

Principal Software Engineer (C#) | London | £110,000-£130,000

Peaple Talent is working with a fast-growing UK fintech that is transforming how customers access financial services through modern, technology-driven solutions.

We’re looking for a Principal Software Engineer to play a key role in shaping and evolving a scalable technology platform within a highly collaborative engineering environment. This is an opportunity to combine hands-on technical leadership with strategic influence, helping to guide architecture decisions while mentoring engineers and driving engineering excellence.

Why You’ll Love It

• Shape the technical direction of a growing fintech platform
• Lead high-impact engineering initiatives and architecture decisions
• Work in a collaborative, agile, and innovation-focused environment
• Influence engineering standards and best practices
• Strong engineering culture focused on quality and continuous improvement

What You’ll Bring

• 5+ years’ experience in senior or principal engineering roles
• Strong commercial experience with C# and .NET development
• Experience designing and building scalable software systems
• Strong problem-solving and analytical skills
• Ability to translate business requirements into technical solutions
• Excellent communication and collaboration skills
• Degree in Computer Science, Engineering, or related field (or equivalent experience)

Nice to Have

• Experience working in regulated or complex technical environments
• Experience mentoring or leading engineers
• Strong understanding of software architecture and design principles
• Experience with automated testing and quality assurance practices
• Agile development experience
• Experience working in fast-paced product-led businesses

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