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Senior Backend Engineer (Kotlin & Java) - Reporting & Insights

Copenhagen, Denmark · Engineering

SumUp is a global FinTech player on a mission to support small merchants to be successful doing what they love all over the world. POS Lite is our free Point-of-Sale within the SumUp app that comes pre-installed on our proprietary register hardware, or it can be installed on tablet & phone devices. Our products are used by millions of independent small business owners (such as cafes, shops, bars, hair salons) around the world, and help them start, run, and grow their businesses. 

As a Senior Backend Engineer in the Reporting & Insights, you’ll be part of the team which provides merchants with actionable sales reports, and insights across all channels, and ensures they comply with local market regulations.

What you’ll do:

  • Design data models taking into consideration business requirements

  • Design, implement, and iteratively create back-end services

  • Use innovative techniques like Event Storming to design back-end services

  • Maintain and evolve the reporting and insights platform

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

  • Help your team to deliver business value by taking decisions related to back-end and actively participating in the product discussions

  • Provide good test coverage and improve code quality

  • Have fun documenting the system using Documentation as Code techniques like C4 Model, Architecture Decision Records, or OpenAPI specs

  • Collaborate with other software developers and DevOps engineers to ensure continuous deployment and support for the software that we deliver using Infrastructure as Code tools

  • Actively participate in pair programming and code reviews with other software engineers

You’ll be great for this role if:

  • You have around 5+ years of experience as a Backend Engineer 

  • You are proficient with a JVM-based language like Java or Kotlin and

    have a recent experience with it

  • You have experience with database design and query optimizations

  • You have experience with distributed and fault-tolerant systems

  • You’re familiar with Spring or any other web application framework

  • You have a passion for clean, maintainable and testable code

  • You have a good understanding of software architecture and application design

  • You have experience with container orchestration tools like Docker, Kubernetes, AWS

The following would be considered a plus:

  • You have experience with Postgres or Cassandra

  • You have experience with Kotlin

  • You have experience with Kafka

  • You worked with event-driven systems

  • You worked with continuous integration tools like GitHub Actions

  • You’re familiar with functional programming concepts

Why you should join SumUp:

🌍 We’re a truly global team of 3200+ people from 80+ countries, spread across 4 continents

🌏 We prefer this person to be based out of Berlin (but are also open to remote colleagues)

✈️ We offer visa and relocation support for you, your family and even your pets

📚  A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education

🚀  Enrolment onto our virtual stock ownership program - you will own a stake in SumUp’s future success

👩🏼‍💻  The opportunity to work on large scale fintech products used by millions of businesses around the world

💶  A corporate pension scheme 

🚵🏾‍♂️  Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches and other location-tailored benefits

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, 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.

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.