Ground every answer in facts on this page and the original listing. We never invent Glassdoor-style reviews or salaries that are not in our data.
Expect system design around billing/subscription state, idempotent payment APIs, and full-stack debugging of charge failures—not generic trivia alone.
Strong fit if you enjoy merchant payments complexity, Berlin on-site work at SumUp, and owning billing/subscription flows end to end.
As a Full Stack Engineer on Billings & Subscriptions at SumUp in Berlin, you would typically ship end-to-end features for merchant plans: APIs and UI for invoices, renewals, and payment status, plus investigating failed charges and aligning with payments and finance partners.
Useful free paths:
The listing marks it on-site in Berlin (remote: no).
Card readers plus online payments and merchant banking tools for small businesses (Wikipedia).
freeCodeCamp and Saylor are free; CS50 and Microsoft Learn are free to learn.
Website: sumup.com
SumUp is a British financial technology company headquartered in London. SumUp’s primary product is an EMV card reader and a number of online payment and bank account system for merchants and businesses.
Public cache only — not an employee review.
Full Stack Engineer - Billings & Subscriptions at SumUp in Berlin, Germany (Full Time, No Remote) The Opportunity At SumUp, our Billing and Subscriptions team is pivotal to how we support millions of transactions across 37 markets. We're currently rebuilding and expanding this foundation to support new sales models, market expansions, and financial integrations that directly impact small businesses using our products. This role will be central in driving these changes. Core Duties Build and maintain backend services and frontend interfaces across billing, contracts, and merchant wallet products. Contribute to the refactoring of key billing components to enhance reliability, data security, and alignment with our wider payments platform. Support the expansion of billing and wallet capabilities into new markets, ensuring localisation requirements are met. Participate in weekly support rotations, handling customer queries and maintaining platform stability. Collaborate closely with senior engineers and product managers to deliver end-to-end features from implementation through production. Who We're Looking For We are seeking a Full Stack Engineer with solid experience in building full-stack applications, particularly with a backend focus. Experience with Node.js or Go is ideal but not required. You should be comfortable working with both relational databases such as PostgreSQL or MySQL and non-relational databases like DynamoDB, MongoDB, or Redis. Practical frontend experience using React and Next.js, with the ability to write clean, typed code in TypeScript or JavaScript, is essential. Strong communication skills in English, both written and spoken, are required. About SumUp SumUp is a global payments technology company that empowers small businesses to thrive by providing seamless payment solutions. Our mission is to make commerce simple for everyone, and we're looking for talented engineers who share this vision. How to Apply To apply, complete your application directly on this page, or you'll be redirected to the employer's application platform to finish submitting there.
Generated for personal interview prep · 2026-08-19 UTC · getajob.ai