Mobile and Backend Software Engineer - Banking

About this role

<div class="content-intro"><p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;"><strong>We’re Capital on Tap 👋<br></strong></span><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">💳 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.</span></p> <p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">Today we're a financial platform - not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier. </span></p> <p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we're profitable. We’ve done a pretty good job so far, but we’re just getting started! </span></p></div><p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">🏡🏢This is a Hybrid role, the team work from our London Offices 2 days per week.</span></p> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><strong>The Team</strong></span></p> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">The Banking and Repayments teams sit at the heart of Capital on Tap's product, owning the core account experience for thousands of small business customers. Banking manages account operations, transaction lifecycles, balance management, ClearBank integration, and savings. Repayments owns the repayment rails, including the most recent open banking repayments. </span></p> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">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.</span></p> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><strong>What You'll Be Doing</strong></span></p> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">As a Senior mobile and backend Software Engineer, you'll own the back-end systems that power our Banking and Repayments platform , while also contributing to mobile - helping transition mobile and front-end ownership from our Customer Experience team into Banking.</span></p> <ul> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Design and build robust, scalable back-end services in C#/.NET</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Own the full SDLC - from feature inception through to production, monitoring, and continuous improvement</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Contribute to mobile development across iOS and Android using Flutter, Kotlin, and/or Swift</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Collaborate with Product, Design, and QA from early feature shaping through to delivery</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Write thorough unit and integration tests and uphold high engineering standards</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Identify bottlenecks and drive improvements across the team</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Work cross-functionally, bridging technical decisions with business goals</span></li> </ul> <p><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><strong>What We're Looking For</strong></span></p> <p> </p> <ul> <li><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Mobile development experience in Flutter/Dart, Kotlin, or Swift - this is a firm requirement</span></li> </ul> <p> </p> <ul> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Strong back-end engineering experience, ideally in C#/.NET</span></li> <li style="font-family: helvetica, arial, sans-serif; font-size: 12pt;"><span style="font-family: helvetica, arial, sans-serif; font-size: 12pt;">Solid…