C# Software Engineer

Zopa Bank Limited; City of Westminster; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid work arrangement

Job summary

Zopa Bank Limited is seeking a senior software engineer to shape technical direction across product-engineering tribes. You will own complex, high-impact work from idea to production and influence what we build and why.

This hybrid role in London requires collaboration across teams with modern tech, including Kotlin, C#, Kafka, Kubernetes, Docker and AWS Aurora Postgres. You will mentor engineers, drive quality and craft robust banking services.

Qualifications

• Strong testing discipline and adherence to TDD.
• Track record delivering high-impact, production-grade systems.
• Ability to influence beyond your immediate team and own outcomes.
• Leadership and mentoring experience to raise team capability.

Responsibilities

• Own complex initiatives from idea to production with measurable outcomes.
• Design scalable backend systems that handle real-world scale and complexity.
• Make architectural trade-offs balancing delivery speed with long-term sustainability.
• Drive continuous improvement in how we build and operate systems.

Skills

Kotlin

C# / .NET

Backend design

Test-Driven Development (TDD)

Mentoring

System thinking

Tools

Kafka

Kubernetes

Docker

AWS Aurora Postgres

Job description

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. We're growing across several of our product-engineering tribes at Zopa, with current opportunities in Current Accounts, Lending, Credit Cards and Product Enablement. We care deeply about great engineering, which is why our core stack is Kotlin, running on a modern platform with Kafka, Kubernetes, Docker and AWS Aurora Postgres. But great engineers aren't defined by a single language which is why we are agnostic with our hiring. We want the right people, not the 'right' language, so if you come from a C#/.NET background, bring solid fundamentals, and have an appetite for learning something new, we'll invest in you, help you grow your skills and confidently step into our Kotlin ecosystem.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
  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., 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
• Experience with fintech or banking is a plus, but we value problem-solvers from all backgrounds
  At Zopa we value flexible ways of working.
• But no matter where you are, we'll make sure you've got everything you need to thrive, both in your work and home life, from day one.
• Subject to having the right to work in the country of choice

We value face-to-face collaboration and a good work-life balance. This hybrid role requires you to come to our London office 2-3 days a week. You'll also have the option of working from abroad for up to 120 days a year!

Diversity Statement

Zopa is proud to offer a workplace free from discrimination. Diversity of experience, perspectives, and backgrounds leads to better products for our customers and a unique company culture for our people. We are made up of nearly 50 nationalities, have a DE&I forum made up of Zopians wanting to make a difference and we are proud of our culture where everyone can bring their full self to work. Our approach to DE&I is reflected in our hiring process so please let us know if you require any reasonable adjustments. Our approach to AI in interviews At Zopa, AI isn't something we're testing out - it's part of how we work every day. As a proud partner of Jobs 2030, we're committed to building AI fluency across our workforce, and we expect Zopians to use AI as part of how they do their jobs. Because of that, we want to be transparent about how we think about AI use during our hiring process. Behavioural and competency-based interviews: please don't use AI. These conversations are designed to understand you - your experiences, your judgment, and how you've approached real situations. An AI-generated answer can't tell us that. What it can do is get in the way of us finding out whether we're the right fit for each other.