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Senior Backend Engineer (GoLang) (f, m, d) - Online Payments

Berlin, Germany · Engineering

SumUp’s Online Payments tribe enables merchants to offer state-of-the-art payment solutions for their online businesses. This tribe plays a key role in working towards SumUp’s vision of operating a 360° full cycle payments solution provider. Fundamental to the success of online payments is having a stable, responsive and adaptive Risk Platform. 

In the Risk squads we are building the anti-fraud 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 anti-fraud 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. By shipping code early and often, you'll see the impact of your work on our merchants’ 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.

What you’ll do

  • Building backend services to automise fraud prevention and risk management in Online Payments

  • Maintain and extend existing backend services with a DevOps mindset (YBIYRI)

  • Collaborate with other Software, QA, Machine Learning and SysOps Engineers and Data Scientists to ensure smooth deployment, continual operation and support for quality software

  • Coach and mentor other engineers to further develop their professional and interpersonal skills

  • Actively provide code review feedback to other software engineers, considering both style and implementation

  • Provide thoughtful and comprehensive documentation and testing for your features before shipping them

You’ll be great for this position if

  • You have 5+ years’ relevant experience in financial services, risk, fraud prevention or related  in an agile large scale ecosystems and first-hand experience in mentoring.

  • You have vast experience with transaction processing systems that have high availability/throughput.

  • You have architectural awareness for systems that are dynamically evolving and are built to last  - microservices, messaging (Kafka is a plus), API design, DB solutions, networking, scalability, monitoring, logging.

  • You’re an ambassador for communication and collaboration, embracing trust and respect to actively shape a healthy team and feedback culture. 

  • You’re passionate about and  experienced in Golang. Further experience in Java/Ruby/Python is considered a plus.

  • You have experience operating in a cloud environment, especially AWS.

  • You understand that sometimes there’s no need to reinvent the wheel. 

  • You have a DevOps mindset and a quality-first approach, and are familiar with engineering best practices to write clean quality code.

Why you should join SumUp

  • We have a dedicated annual budget for attending conferences and advancing your career through further education. We encourage you to speak at conferences and give talks.

  • You’ll attend a weekly Lunch and Learn session, where the local engineering team exchanges ideas over company-sponsored lunch.

  • We set aside time every other week for side-projects and open source initiatives.

  • You’ll attend annual hackathons with the engineering teams from Berlin, Cologne, Sofia and São Paulo.

  • You’ll be part of a close, welcoming and international community. We get together regularly for brunches, cocktail nights, football, office events, AMA sessions, training, German lessons and yoga classes.

  • We offer numerous other benefits such as Urban Sports Club subsidy, corporate pension scheme, Kita placement assistance, relocation assistance, 2x per week subsidised office lunches, and a gorgeous place to work in the heart of Berlin at Alexanderplatz.

You are welcome to have a look at developer documentation for online payments integrations: is also passionate about open source software, and we are proud of what we have given back to the community, including in GoLang. Check out here:

About SumUp

We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams.

Small business owners are at the heart of all we do, so we're creating 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 small business owners 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, colour, 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 a candidate. 

Want to get more insights about SumUp? Don't miss to visit us on our blog on Medium, or check our social media pages on Facebook, Twitter and LinkedIn.