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Senior Backend Engineer (Elixir) - Hardware

Berlin, Germany · Backend

As part of our vision to become a truly global tech company, we are building out local, autonomous, cross-functional teams that can take an aspect of our product and perfect it from concept to execution. In Hardware our goal is to envision and beautifully design our products, making sure they are prepared for payment and security specifications. We are passionate about our product and the vision of bringing new payment solutions to small merchants.

Our mPOS and printers delegate a significant part of the payment logic to the backend, giving us the flexibility and development speed which our merchants require from us. As a Senior Backend Engineer, you will support our team with delivering new features to one of those devices and maintaining existing ones - transaction flows for different payment methods, firmware updates, and other integrations with our internal services. You will also migrate and maintain our terminal backend infrastructure, which includes assets management, card payment processing, hardware configuration, logging and monitoring.

What you’ll do

  • Design, implement, and iteratively improve backend services in Elixir

  • Migrate our core terminal backend from Erlang to Elixir, and extend it

  • Participate in API design and implementation for both internal APIs and those exposed to our devices and mobile application

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

  • Provide comprehensive documentation and good test coverage, and improve code quality

  • Collaborate with other software, QA and sysops engineers to ensure smooth deployment, continuous integration, and support for the software that we deliver

  • Actively participate in code reviews with other software engineers

You’ll be great for this role if

  • You have 5+ years of experience as a backend engineer 

  • You have relevant experience with Elixir and OTP (whether in a production environment or from pet projects)

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

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

  • You are humble, transparent and enjoy working with the people around you

  • You are proactive and able to thrive in a fast-paced, dynamic environment

Awesome if you 

  • Are active in Elixir community, contribute to open source or have personal projects

  • Enjoy mentoring fellow engineers and love sharing knowledge

  • Have experience with distributed and fault tolerant systems

  • Worked in an international, distributed team

  • Have experience with Docker

Why you should join SumUp

  • You’ll be part of a welcoming and international community of 1700+ people from over 60 nationalities. We get together regularly for breakfasts, cocktail nights, sports and office parties.

  • We offer visa and relocation support for a smooth transition to living and working in Berlin.

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

  • You’ll attend semi-annual off-sites with the whole Hardware Team. In the past, we've visited Italy, Greece and a castle in the German countryside.

  • We offer a corporate pension scheme, free German and yoga classes, subsidised gym membership, sports clubs and other benefits.

Apply now!

We're looking forward to meeting our next teammate! You can choose whether to include a CV and/or a link to your GitHub or LinkedIn profile, tech blog or portfolio – whatever you think will give us the complete picture.

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, 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.