Mobile Software Engineer

About Us

We’re Capital on Tap – a mission‑driven company that helps small‑business owners make their lives easier. Today, we offer an all‑in‑one business credit card and spend‑management platform that saves time and money for over 200,000 businesses worldwide. Our vision is to support 1 million small businesses by 2030.

Location: London |
Work Model: Hybrid – two days per week in office.

The CX team is the face of Capital on Tap’s product offering. We’re a fun, enthusiastic group focused on building elegant and accessible mobile and web platforms for our customers. As a CX Engineer, you’ll work across a diverse tech stack from UI to service and data layers.

• Build robust, scalable mobile solutions using mainly Flutter.
• Own the full SDLC, from the first line of code to production and monitoring.
• Identify bottlenecks and use technologies like AI to drive efficiency gains.
• Collaborate closely with Product Managers, QA, and fellow Engineers.
• Write comprehensive unit and integration tests to ensure a high‑quality user experience.
• Translate technical solutions into business‑friendly language to ensure alignment.

• Just Pilot – we never settle for “good enough”, we pilot new ideas fast, ask questions, and scale quickly.
• Why Not Today? Speed and simplicity give us a competitive advantage.
• Be a Buddy – we help each other from day one and do the right thing even if it’s hard.
• Owners and Dates – if you own a task and set a date, the expectation is that it gets done.
• Feedback – we foster growth through direct, constructive feedback.

• 3+ years of hands‑on Flutter and Dart mobile development.
• Experience building and deploying apps for both Android and iOS.
• Native mobile development in Kotlin or Swift (ideally both).
• Strong testing practices, including unit and integration testing.
• Proven experience in Agile development environments.
• A proactive, supportive, and collaborative team mindset.

Even if you don’t have all the skills, we encourage you to apply.

• Stage 1: 30‑minute intro, CV review, and value discussion with a Talent Partner.
• Stage 2: 45‑minute “Tech Chat” with the Team Manager.
• Stage 3: 90‑minute code pairing + 30‑minute values interview.

We welcome, consider, and encourage applications from anyone who shares our commitment to inclusivity.

• Private healthcare (including dental and opticians) via Vitality.
• Worldwide travel insurance via Vitality.
• Anniversary rewards (£250, £500, £750, and a 4‑week fully paid sabbatical).
• Salary sacrifice pension scheme up to 7% match.
• Octopus EV salary sacrifice scheme.
• 28 days holiday plus bank holidays.
• Annual learning and wellbeing budget.
• Enhanced parental leave.
• Cycle to work scheme.
• Season ticket loan.
• Six free therapy sessions per year.
• Dog‑friendly offices.
• Free drinks and snacks in our offices.

• Check out our “Top Tips” for interviewing.
• Follow us on Linked In for new job opportunities.
• For questions, email

If you’d like to progress your career within our fast‑growing, profitable fintech, click apply. We aim to get back to you within 3 working days (up to 5 during busy periods).