Back-end Engineer - Golang

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Our SumUp office in Cologne is hiring for the position of Backend Engineer.

In this role, you'll work with a small cross-functional co-located team to build tools that help hundreds of thousands of small businesses thrive. By shipping code early and often, you'll see the impact of your work on merchant's daily lives right away. You'll collaborate with experts in product, design, and operations to deliver mission-critical internal and external features that power the SumUp ecosystem.

We work on a number of different domains that span technologies, systems, and processes. A few of the technologies we're leveraging on SumUp platform include Ruby, Scala, Node, Erlang, Go, Kafka, Kubernetes and Docker.

The technology focus of the team in Cologne is to develop new systems powering our new ventures' platforms on Go, Kubernetes and Docker.

Your role and responsibilities

  • Participate in API design and implementation for both internal APIs and those exposed to our third-party integrators.
  • Provide thoughtful and comprehensive documentation and testing for your features before shipping them.
  • Design, implement, and iteratively improve new backend services.
  • Maintain and extend existing backend services.
  • Collaborate with other software, QA and sysops engineers to ensure smooth deployment, continual operation and support for quality software.
  • Actively provide code review feedback to other software engineers, considering both style and implementation.

About SumUp

We are the leading mobile point-of-sale (mPOS) company in Europe. Our company vision is to become the first ever global card acceptance brand. Today tens of thousands of merchants accept card payments with SumUp in 31 countries including Germany, France, the UK and Brazil.

Headquartered in London, SumUp's major offices are in Berlin, Sofia and São Paulo.

We recently launched a brand new contactless device, which makes paying by card easier than ever before.

Main requirements

  • Experience with Golang (knowledge of Ruby or Java is a plus)
  • Experience with Microservices architecture and Restful APIs
  • Experience with protocol buffers and GRPC are a plus
  • Experience with Git
  • Experience within Linux/Unix environment (comfortable working with a CLI)
  • Solid FP skills
  • Solid debugging, optimisation and problem-solving skills
  • Self-motivated, proactive and engaged attitude towards projects
  • Ability to write clear and concise code that your teammates can understand and build upon


  • The Back-end Team: You'll be with people who care about mutual learning, keeping our technical knowledge up-to-date, and discussing ideas that not only contribute to the company's success, but keep everyone connected to the wider tech community.
  • Opportunity to attend tech meetups and conferences with the team (especially if you're giving a talk!).
  • Convenient location in the heart of Cologne.
  • All the startup swag you expect: Xbox, unlimited coffee, and a shiny MacBook Pro.
  • At least one off-site every year, where the tech teams from Berlin, Cologne, Sofia, and São Paulo gather to hack together. In the past we've gone to Germany, Bulgaria and Greece.
  • Our office has a strong sense of community; we get together regularly for sports, Karneval, and drinks.

  • Our global team comes from 30 different countries creating a fun, international environment.

    Apply now!

    We are looking forward to meet our next teammate!

Apply now

Sign up to apply

Or sign up to refer and earn a reward of €300