Senior C# Software Engineer

About the Role

You will design and evolve the services that power core banking products. The systems you help build process thousands of financial transactions every day. They must be scalable, resilient and secure. When money moves, it has to work. Every time

But this role goes beyond implementation

You will shape technical direction. Influence cross-team initiatives. Own complex, high-impact work from concept through to production. You will help decide not just how we build, but what we build and why

This is senior in impact, not just title

What the job involves

• 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

Who you are

• 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

Desirable

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

Company Benefits

• 2-3 days a week in the office. We value face-to-face collaboration and a good work-life balance.
• Option of working from abroad for up to 120 days a year!
• 25 days holiday as standard, rising up to 30 days
• Private medical insurance through Vitality Health (includes discounted gym memberships, savings at retailers)
• Free Headspace access
• 16-weeks full pay for all new parents (enhanced maternity and paternity pay)

Salary Benchmarks

Software Architect

Expert: £160k

Senior: £140k

£80k - £160k

About [Employer hidden]

[Employer hidden] has been a pioneering force in the world of finance since 2005, lending out billions in personal loans since its inception, before the launch of its bank in 2020. Its depth of lending experience makes it a digital bank with a difference - offering all the benefits customers have come to expect from a challenger bank, but backed up by 16 years of know how.

[Employer hidden] has carved out a strong position for itself in UK fintech, offering more than just loans with products like savings accounts and credit cards. And its clear focus on lending and saving has paid off, with recent investment fueling both product growth and its entry into business lending. The bank also made its first acquisition, snapping up 'buy now, pay later' platform DivideBuy, as part of its expansion strategy.

On top of that, [Employer hidden] is now boasting two consecutive years of profit doubling, a rare feat in digital banking. Backed by fresh funding, it's now pushing into new territory with plans to launch a current account and integrate generative AI into customer services.

Application Instructions

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