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Golang Software Engineer - Risk

Sofia, Bulgaria · Backend

In the Risk Business squad we are building the risk mechanisms to help us keep our merchants and their customers safe. Monitoring million transactions per day and finding suspicious patterns between them is no easy task. That’s why we will be creating in-house solutions as well as integrating with third party providers. 

At SumUp you can be the hero who stops bad actors from operating and who enables small merchants around the world to accept payments in a safe environment!

You will be working alongside Software Engineers and Data Scientists that are creating an integrated fraud-prevention solution that will take advantage of cutting edge technologies like machine learning and property graph databases.

A few of the technologies you will be able to use are: Golang, Kafka, Kubernetes, Terraform, PostgreSQL and NOSQL data storages.

SumUp is passionate about open source software, and we are proud of what we have given back to the community, including in Golang.

Check out here:


  • Design, implement, and iteratively improve new backend services.

  • Maintain and extend existing backend services.

  • Integrate with third party providers in a meaningful way for SumUp

  • Participate in API design and implementation for both internal APIs and those exposed to our third-party integrators

  • 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.

  • Collaborate on thoughtful and comprehensive documentation and testing for your features before shipping them.


  • You have a Bachelor's degree or equivalent experience in Computer Science/Information Technology;

  • You have at least 3 years experience with one or more backend languages, preferably: Golang, Java

  • You are technology agnostic and you are willing to use the right tool for getting the job done

  • You have experience with microservices architecture and Restful APIs

  • You have experience with Git

  • You have experience with SQL (PostgreSQL) and NoSQL storages

  • You have experience within Linux/Unix environment (comfortable working with a CLI)

  • You have solid Object Oriented Programming and Functional Programming skills

  • You have solid debugging, optimisation and problem-solving skills

  • You are self-motivated, proactive and engaged towards projects

  • You have the ability to write clear and concise code that your teammates can understand and build upon

  • You are fluent in English - you'll be part of a truly global company!


  • A truly global team of 2000+ people from 60+ countries, spread across 3 continents.

  • Getting together regularly for breakfasts, team events, office parties and sports.

  • A budget for attending conferences and external training.

  • Visa and relocation support for you, your family and even your pets.

  • Participate in weekly Lunch and Learn sessions, where ideas are shared and discussed over company-sponsored lunch.

  • Attend global offsites and/or hackathons.

  • In Sofia: 25 days’ paid leave, plus 1 additional day for each year of employment and you can take up to 10 days’ educational leave to expand your skill set.

Looking forward to receiving your application!

About SumUp

We believe in the everyday hero.

Small business owners are at the heart of all we do, so we create powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a ‘team-first’ attitude, our diverse teams across Europe, South America, and the United States work together to ensure that the small business owners we partner with can be successful doing what they love. 

SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, color, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age, or any other basis protected by applicable laws or prohibited by company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.

SumUp will not accept unsolicited resumes from any source other than directly from an individual/candidate.

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.