Full Stack Engineer - Online Payments

Here at SumUp, we're not just reshaping the way businesses handle transactions; we're revolutionizing the entire fintech landscape. SumUp is empowering small merchants in 36 countries to thrive in the digital age. Picture this: seamless payments at your fingertips, effortlessly bridging the gap between buyers and sellers. From bustling city streets to remote corners of the globe, our cutting-edge technology is democratizing commerce like never before.

 Exciting Opportunities:

Resilience: We are responsible for 90% of fees charged to SumUp merchants, so scalability and availability are major challenges.

Transparency: We handle fees charged to merchants, so it is always a sensitive topic when they think their fees are wrong. We aim to provide the answer to a single, but complex question: "How much did I pay for this transaction and why?".

Auditing: Fees are a very regulated part of our business. We have also to provide the means for regulators and auditors to investigate why a certain fee was applied or changed.

Automation: We provide a platform for fee change automation based on many variables, so we consume events from the whole company to determine the best fee structure for the merchant.

Expand Pricing Capabilities: Implement fee charging for all SumUp products, not just card reader transactions. This includes SumUp Bank, Card Not Present products, and Tap on Phone. Ensure the ability to apply different fees based on the specific SumUp product used.

 What you will do:

• Design, build and maintain services following SumUp's microservice architecture
• Develop high-quality, scalable code adhering to the company standards and best practices
• Participate in API design and implementation for internal APIs
• Actively participate in product discussions and code reviews with other engineers by working closely with stakeholders and internal integrators
• Provide comprehensive documentation, good test coverage, and improve code quality with security in mind
• Define the infrastructure for your apps in the form of IaC and run them in production (You Build It, You Run It)

You will be great for this position if: 

• You have 3+ years of programming experience either in Go, Node.js, Ruby/Rails, Java
• You have Frontend skills, preferably in modern frameworks and libraries (like React and Next.js)
• You have some experience with databases, relational (like PostgreSQL and MySQL) and non-relational (like MongoDB, Redis and DynamoDB)
• You have a passion for clean, maintainable, and testable code
• You are pragmatic: do the right thing, unblock the team, make trade-offs when needed
• You are a quick learner and have the ability to pick up new skills and concepts 

Nice to have skills:

• Experience with Elixir
• Experience with AWS and Terraform
• Experience with Domain Driven Design (DDD)

Why you should join SumUp

• Opportunity to work with a truly global, multicultural team (we are 3200+ people from 80+ countries, spread across 4 continents)

• 28 days’ paid leave

• Competitive salary package and virtual stock option programme

• Learning & development budget for attending conferences and external training

• SumUp Corporate Pension Scheme

• Wellness benefits: in-house fitness classes with Fitness Matters, in-house Yoga teacher, gym in the office, football & running teams, subsidized Urban Sports Club

• A lot of other cool benefits such as Bike leasing, Subsidised Public Transport Card, Language Learning platform/courses, Kita placement assistance, relocation assistance, 2x per week subsidised office lunches, and a brand new beautiful place to work in the heart of Berlin!

 About SumUp

We believe in the everyday hero.

Small business owners are at the heart of all we do, so we're creating tools that 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, 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