SumUp

Fullstack Engineer - Bank

SumUp
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2 months ago
Sofia, BulgariaMid Level

Responsibilities

  • Build and own web banking features end-to-end from scoping and component implementation through testing, observability, and production maintenance.
  • Define API contracts, work with backend proxies, and integrate with services supporting the banking platform.
  • Contribute to architectural improvements, component refactoring, modernization efforts, and stack migrations.
  • Review pull requests with attention to UI consistency, accessibility, and frontend best practices.
  • Participate in production support and incident reviews to improve operational resilience.

Requirements

  • Strong experience with React and TypeScript delivering production-ready features end-to-end.
  • Full-stack experience defining API contracts, working with backend proxies, and owning integrations.
  • Backend experience with Node.js, Kotlin, Java, or Go is valued.
  • Understanding of frontend architecture, component design patterns, state management, and frontend-to-backend connectivity.
  • Experience writing and maintaining unit, integration, snapshot, and end-to-end frontend tests.
  • Comfort working in a complex multi-stack codebase and familiarity with technologies such as Angular, AWS, and Kafka is a plus.
  • Familiarity with CI/CD practices and safely delivering changes to production.
  • Exposure to AI tooling for engineering workflows is a plus.

Benefits

  • Office-first work setup from SumUp’s Sofia office, with global collaboration opportunities.
  • Virtual Stock Option programme.
  • Annual €2000 learning and development budget plus 10 paid educational-leave days.
  • 25 days of paid leave, increasing by one day per year of service up to 35 days, plus public and special leave.
  • Additional health and life insurance.
  • On-site yoga and a co-sponsored Multisport card.
  • Tax-free food vouchers and flexibility through the Re:Benefits platform.
  • Free shuttle buses to Joliot-Curie metro station.
  • One-month sabbatical after three years of service.
  • Referral bonus programme.
SumUp

About SumUp

1,001-5,000 employees

SumUp builds card readers, point-of-sale apps, and payment tools for small businesses, along with accounts, invoicing, and online checkout. It sells hardware and earns fees on payment processing and subscriptions for software and services such as invoicing and loyalty. Founded in 2012 and headquartered in London, the company serves more than 4 million merchants across 30+ markets, and offers options like payment links and Tap to Pay.

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