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Be ready to discuss full-stack design for billing: idempotent payments, retries, proration, dunning, and reconciliation. Expect system-design and coding questions around APIs, data models for subscriptions, and how you’d ship safely in a regulated payments environment.
Strong fit if you enjoy fintech product work for merchants—payments, subscriptions, and full-stack delivery in a multi-market payments company based in Berlin.
As a Full Stack Engineer on Billings & Subscriptions at SumUp, expect to build and maintain payment-adjacent product surfaces: subscription lifecycle, invoices, recurring charges, and merchant-facing flows tied to SumUp’s card-reader and online payment stack. Day-to-day work likely spans APIs, web services, and UI that keep billing correct, reliable, and easy for small businesses.
SumUp provides card readers and online payment/banking tools for merchants; it was founded in 2011 and is headquartered in London.
The listing is for Berlin with remote set to no; plan on working from the Berlin area.
Likely the systems that handle recurring plans, invoices, and charge lifecycle on top of SumUp’s merchant payment products.
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 & SubscriptionssumupBerlin, GermanyFull Time, No Remote Position Summary At sumup, the Billing and Subscriptions team is at the core of how our merchants manage their payments and grow with our products. We are responsible for the billing engine, merchant wallet, and subscription experiences that power millions of transactions across 37 markets. Currently, we're in a phase of rebuilding and expanding this foundational infrastructure to support new sales models, market expansions, and financial integrations. This role is pivotal in shaping how small businesses experience SumUp. Responsibilities Build and maintain backend services and frontend interfaces across our billing, contracts, and merchant wallet products Contribute to the refactoring of key billing components to improve reliability, data security, and alignment with our wider payments platform Support the expansion of our billing and wallet capabilities into new markets, ensuring localisation requirements are met Participate in our weekly support rotation, handling incoming customer queries and helping maintain platform stability Collaborate closely with senior engineers and product managers to deliver features end-to-end, from implementation through to production Skills & Qualifications Solid experience building backend services and frontend interfaces Proficiency in refactoring code for reliability and security Experience with billing systems and subscription management Knowledge of localisation requirements and market expansion strategies Strong communication skills to support customer queries and maintain platform stability Ability to work closely with cross-functional teams, including senior engineers and product managers Why Join sumup Joining the Billing and Subscriptions team at sumup means being part of a dynamic and innovative environment where you can directly impact how small businesses grow. Our mission is to empower merchants, and as a Full Stack Engineer, you will play a crucial role in shaping our billing and subscription experiences. Ready 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. We look forward to hearing from you!
Generated for personal interview prep · 2026-08-01 UTC · getajob.ai