At a Glance
- Tasks: Design and build scalable back-end services and contribute to mobile development.
- Company: Join a fast-growing financial platform revolutionising small business banking.
- Benefits: Hybrid work model, competitive salary, and opportunities for professional growth.
- Other info: Dynamic team environment with a focus on collaboration and ownership.
- Why this job: Make a real impact on small businesses with innovative tech solutions.
- Qualifications: Experience in mobile development and strong back-end engineering skills required.
The predicted salary is between 60000 - 80000 £ per year.
Mobile and Backend Software Engineer - Banking London Capital on Tap started because small businesses were underserved.
Big banks were slow, their products weren’t fit for purpose, and small business owners often couldn’t access what they needed.
We set out to fix that.
Today we are a financial platform that offers a best‑in‑class business credit card, SME‑focused spend management platform, a savings product that reached £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier.
We have over 1 000 employees, £20 bn in annual card spend, more than 200 000 customers, and over 17 000 Trustpilot reviews averaging 4.7 stars.
We are profitable and just getting started.
This is a hybrid role; the team works from our London offices two days per week.
The Team The Banking and Repayments teams sit at the heart of our product, owning the core account experience for thousands of small business customers.
Banking manages account operations, transaction lifecycles, balance management, Clear Bank integration, and savings.
Repayments owns the repayment rails, including the most recent open banking repayments.
We value engineers who take genuine ownership, work autonomously, and bring depth across the stack.
This is a high‑priority hire with real impact from day one.
What You’ll Be Doing Design and build robust, scalable back‑end services in C#/.
NET Own the full SDLC – from feature inception through to production, monitoring, and continuous improvement Contribute to mobile development across i OS and Android using Flutter, Kotlin, and/or Swift Collaborate with Product, Design, and QA from early feature shaping through to delivery Write thorough unit and integration tests and uphold high engineering standards Identify bottlenecks and drive improvements across the team Work cross‑functionally, bridging technical decisions with business goals What We’re Looking For Mobile development experience in Flutter/Dart, Kotlin, or Swift – this is a firm requirement Strong back‑end engineering experience, ideally in C#/.
NET Solid testing practice across unit and integration testing Experience with CI/CD platforms such as Code Magic or similar Comfortable working in Agile environments Autonomous and collaborative – you take ownership and see things through Database experience: SQL Server, Mongo DB, Firestore Cloud experience: GCP (Firebase) and Azure CI/CD familiarity: Code Magic Diversity
Mobile and Backend Software Engineer - Banking employer: Capital on Tap
At Capital on Tap, we pride ourselves on being an excellent employer that fosters a collaborative and innovative work culture. Our London-based team enjoys competitive benefits such as private healthcare, 28 days of holiday, and a dedicated learning budget to support professional growth. Join us to be part of a dynamic environment where your contributions directly impact our mission and success.
