Back to all jobs

Senior Full Stack Engineer (JavaScript) - Merchant Growth (f/m/d)

Berlin, Germany · Engineering

Who we are

The Billing squad’s mission is to provide a flexible and easy-to-integrate billing platform that powers the growing number of SumUp’s subscription services like Accounting or eCommerce. We enable merchants and business partners to offer recurring payment solutions for their subscription businesses together with SumUp’s online payment platform. We’re looking to further diversify our small but growing team, working across our Berlin and Kyiv offices.

As Senior Full Stack Engineer you’ll be a driver of our Billing platform vision, shaping the future design of our APIs for integration and providing an outstanding developer experience. You'll work in a cross-functional, co-led team and collaborate closely with expert engineers from multiple squads to deliver our platform innovation. You’ll play a key role in working towards SumUp’s vision of operating a 360° full-cycle payments solution provider.

What you’ll do

  • Drive design and implementation of our APIs, both internal and those exposed to our integrators

  • Work with product, design and operations to improve the Billing User Experience for our merchants

  • Improve interfaces with the payments platform teams for scalability of our joint payments platform

  • Develop integrations with internal tools and support onboarding of new subscription services to our platform

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

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

  • Help our team grow, coach and mentor other engineers to further develop their professional and interpersonal skills

You’ll be great if

  • You have 7+ years’ relevant experience in agile large scale ecosystems and first-hand experience in mentoring, ideally with expertise in payments or billing services.

  • You’re a full stack JavaScript expert, using React, Node.js and MongoDB.

  • You have experience with microservices architecture, Restful API design, CI/CD and operating in a cloud environment, ideally Heroku.

  • You strive for code quality, know how to create meaningful tests and care about usability, but also know how to be pragmatic.

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

  • You're taking initiative to propose and pursue your ideas, are keen to experiment and have the perseverance to move initiatives forward.

Why you should join SumUp

  • We’re a highly autonomous team with plenty of opportunities for you to drive innovation at SumUp, develop your career and leave your mark.

  • We’re a truly global company of 2000+ people from 60+ countries, spread across 3 continents and with offices in some of the liveliest cities across the globe.

  • 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.

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

  • You’ll be part of a close, welcoming and international community. We get together regularly for brunches, office events, AMA sessions, hackathons, training, German lessons or yoga classes, to name a few.

  • We offer numerous other benefits such as Urban Sports Club subsidy, corporate pension scheme, Kita placement assistance, relocation assistance, subsidised office lunches, and gorgeous places to work in the heart of Berlin or Kyiv.

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.