Senior C# Software Engineer – London

The role

You will design and evolve services that power core banking products, processing thousands of financial transactions every day. You will shape technical direction, influence cross-team initiatives, and own complex work from concept to production.

What you will do

• Design and evolve services that power core banking products
• Build systems that are scalable, resilient and secure
• Shape technical direction and influence cross-team initiatives
• Own complex, high-impact work from concept through to production
• Make architectural decisions that balance delivery with long-term sustainability
• Influence prioritisation and trade-offs across teams
• Raise the bar for engineering quality, reliability and accountability
• Mentor engineers and strengthen overall team capability
• Drive continuous improvement in how systems are built and operated

Required qualifications

• A track record of delivering high-impact, complex systems in production environments
• Solid engineering fundamentals; C#/.NET background is welcome
• Strong testing discipline, committed to strictly following Test-Driven Development (TDD)
• Strong systems thinking and architectural judgement
• 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
• Deep customer focus and a bias toward measurable outcomes
• Experience mentoring others and amplifying team impact
• Ownership beyond your own output
• Willingness to learn new technologies such as Kotlin, Kafka, Kubernetes, Docker and AWS Aurora Postgres

Nice to have

• Experience with fintech or banking

Benefits

• Option to work from abroad for up to 120 days a year, subject to right to work
• Support for transition and cross-training into a JVM/Kotlin environment

Before you apply

• Working from abroad requires the right to work in the country of choice
• Technical interviews may or may not allow AI use; your Talent Partner will say what is expected at each stage
• Behavioural and competency-based interviews: AI use is not permitted

About the company

Zopa started in 2005 as a peer-to-peer lending company and launched Zopa Bank in 2020. It has been named in the top three UK's Most Loved Workplaces.