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.
Prepare for senior backend depth: system design for payment-like reliability, API design, data modeling, debugging production issues, and clear trade-off talk. Practice explaining past ownership of services under load; expect coding plus design discussions. No SumUp-specific interview process is in the provided data.
Strong fit if you want on-site Berlin work on merchant payments and fintech backends at a company scaling products and markets. Thin public sentiment and no compensation figures here—validate culture and pay directly with the hiring team.
As a Senior Backend Engineer at SumUp, expect ownership of server-side services that power merchant payments, card-reader backends, and related banking features. Typical work includes designing APIs, hardening reliability for high-volume transactions, collaborating with product and platform teams, and shipping incremental improvements as SumUp grows consumer and merchant products across markets.
Strengthen backend fundamentals (APIs, data stores, concurrency, testing) via free paths:
No. The listing is for Berlin with remote set to off-site only (remote = 0).
Merchant-focused payments: card readers, online payments, and bank-account tools, with newer consumer banking and investing products reported in the news data.
See the paraphrased facts above and SumUp on Wikipedia; company site domain is sumup.com.
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.
Senior Backend Engineer - Cards at sumup in Berlin | Full Time, No Remote About the Role At SumUp, we build simple, affordable financial tools to help small businesses thrive. We offer a range of products including business banking, card issuance, lending, and invoicing, all integrated into one platform for streamlined management. The Cards squad is at the heart of this mission, owning systems that power card issuing, lifecycle management, and transaction processing across Europe. We handle millions of transactions daily and are scaling these systems to support new product capabilities while laying the foundations for a more global, resilient platform. This role involves taking ownership of complex backend services, contributing to technical roadmaps, and ensuring high-throughput, distributed architecture. Responsibilities Owning and leading the end-to-end delivery of backend services within the Cards EU domain, including observability, testing, and production support Participating in architectural discussions and proposing solutions for complex, distributed systems challenges Collaborating with cross-functional teams to ensure seamless integration and smooth operations Skills & Qualifications Expertise in building high-throughput, distributed backend services Experience with observability tools and practices A solid understanding of testing principles and methodologies Strong problem-solving skills and ability to work independently or as part of a team Familiarity with microservices architecture and containerization technologies (e.g., Docker, Kubernetes) Proficiency in at least one modern programming language (e.g., Python, Go, Rust) Experience with cloud platforms such as AWS, GCP, or Azure is a plus Working at sumup At SumUp, you'll join a dynamic and innovative team dedicated to empowering small businesses. Our Berlin office offers a vibrant work environment where creativity and collaboration thrive. To get a feel for our space, watch the . 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 · 2026-08-01 UTC · getajob.ai