Senior C# Software Engineer – London

Your impact:

Owning complex initiatives end to end, from idea to measurable outcome

Designing scalable backend systems that stand up to real-world scale and complexity

Making architectural decisions that balance immediate delivery with long-term sustainability

Bringing structure and clarity to ambiguous problems

Influencing prioritisation and trade-offs across teams

Raising the bar for engineering quality, reliability and accountability

Mentoring engineers and strengthening overall team capability

Driving continuous improvement in how we build and operate systems

Your toolkit:

You'll work with C#, Kafka, Kubernetes, Docker, AWS Aurora Postgres, and other modern technologies. If you haven't worked with all of these, we value skilled engineers with a willingness to learn.

A track record of delivering high-impact, complex systems in production environments

Strong testing discipline, with a commitment to strictly following Test-Driven Development (TDD)

Strong systems thinking and architectural judgement

The ability to navigate ambiguity and turn complexity into clear, actionable plans

Confidence making data-informed technical decisions with long-term consequences in mind

Experience influencing beyond your immediate team

A deep customer focus and a bias toward measurable outcomes

Experience mentoring others and amplifying team impact

Ownership beyond your own output

We’ll support your transition and cross-training into a JVM/Kotlin environment. What matters most to us is how you think, how you approach problem-solving, and the scale and impact of what you’ve built.

Our engineering culture:

Customer impact over unnecessary complexity

Team success over individual heroics

Operational ownership, not just feature delivery

Continuous improvement through honest feedback

Added bonus:

Experience with fintech or banking is a plus, but we value problem-solvers from all backgrounds