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Senior Backend Engineer - Golang

SumUpCologne, Germany
On-site Full-time

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Experience Level

Senior

Qualifications

Qualifications: 5+ years of backend engineering experience with a focus on Golang. Deep understanding of system architecture, design principles, and data modeling. Experience with distributed systems and fault tolerance. Familiarity with API design and best practices. Strong collaboration skills and a proactive approach to problem-solving.

About the job

About the Team

Join the Sell Online Tribe at SumUp, where we are transforming how merchants establish their online presence. Our team designs and builds solutions that empower millions of entrepreneurs—from barbers to bakers—to sell their products and services from anywhere. With a focus on Online Store and Bookings, our products form the backbone of SumUp’s ecosystem, enabling merchants to manage appointments, showcase offerings, and process payments seamlessly from their mobile devices.

We are a dynamic, cross-functional team of Product Managers, Designers, and Engineers dedicated to creating exceptional mobile experiences. As part of our team, you’ll play a vital role in expanding into new industries, bridging the gap between web and mobile platforms, and simplifying digital commerce for small businesses globally.

About the Role

As a Senior Backend Engineer within the Bifrost team, you will be instrumental in the development of SumUp's key merchant-facing online products. You will contribute to the growth and scalability of pivotal products such as Payment Links, Virtual Terminal, and Unified Gift Cards, while also enhancing integration products that deliver essential functionalities across various SumUp services.

We seek a developer who champions reliability, collaboration, and continuous improvement. You will thrive in a high-impact environment where your contributions directly enhance merchant success and team scalability.

Your Responsibilities

  • Ensure redundancy for the scalability and continuous enhancement of SumUp’s high-priority online products.
  • Contribute to the implementation, growth, and integration of Online Checkouts across SumUp.
  • Engage actively in planning and review sessions at both quarterly and sprint levels, providing constructive feedback and accurate estimations.
  • Monitor existing services and perform necessary fixes to maintain platform reliability.
  • Implement new features with maintainable and testable code.
  • Optimize application performance for improved scalability.
  • Participate in code reviews to uphold high standards of code quality.

You Will Excel in This Role If:

  • You possess over 5 years of experience in backend engineering, specifically with Golang.
  • You demonstrate a strong grasp of fundamental system architecture, design principles, data modeling, and API design.
  • You have substantial experience with distributed and fault-tolerant systems.
  • You are passionate about continuous learning and improvement.

About SumUp

SumUp is a leading fintech company dedicated to empowering small businesses by providing simple and effective payment solutions. Our mission is to enable entrepreneurs to thrive in the digital marketplace by offering cutting-edge tools and resources.

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