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# Senior Backend Engineer

- **Company:** SumUp
- **Location:** Köln, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Software Quality, Code Review, Distributed Systems, Python (Programming Language), NoSQL, SQL Databases, Backend, Kotlin, Kubernetes, Docker
- **Published:** June 14, 2026
- **Apply:** https://de.indeed.com/viewjob?jk=dda0c215036bd445

## About the Role

Do you have experience in Python?, * Strong proficiency in Go, Kotlin or Python, with a track record of building scalable, production-grade backend services

 * Experience working with cloud platforms (AWS or comparable) and container orchestration tools such as Docker and Kubernetes
 * Solid understanding of SQL and NoSQL databases, distributed systems, and the trade-offs that come with high-availability requirements
 * Comfort navigating complex, regulated environments - whether that's financial services, payments, or similarly high-stakes domains
 * A collaborative, product-oriented mindset with the ability to work independently, communicate clearly, and adapt when priorities shift

Any of the following would be considered a plus

 * Previous experience in a Growth-focused engineering team.
 * Familiarity with the Fintech or Banking regulatory landscape.

## Description

* Build and maintain Backend services for Core neobanking features including bank transfers, open banking, savings accounts, and payment processing
 * Take end-to-end ownership of features and projects, covering scoping, design, development, testing, deployment, and maintenance, leveraging Go along with Docker and Kubernetes for container orchestration.
 * Take ownership of critical infrastructure migrations - including our banking core system transitions - without disrupting live customer experiences
 * Collaborate closely with cross-functional teams including product, design, data science, security, and operations) to understand requirements, provide technical insights, and contribute to architecture discussions that ship meaningful banking features end-to-end
 * Support fellow developers and actively help build a collaborative, innovative engineering culture
 * Shape technical architecture and lead code reviews, helping define and promote best practices in code quality, testing, automation, and security to raise the overall engineering bar.
 * Build and integrate tools and systems that improve operational efficiency and reliability, with strong observability through monitoring, alerting, and hands-on involvement in incident response and post-mortems.


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