Senior Backend Engineer (Kotlin)

Join Our Global Bank Tribe

Joining our Global Bank Tribe means you'll play a pivotal role in building SumUp's very own digital bank. You’ll be part of a global, autonomous, cross-functional team, with over 32 nationalities across Cologne, Berlin, São Paulo, Santiago, Sofia, and Vilnius who love to take ownership, work with purpose, and are building the number 1 bank for small businesses.

Role Overview

As a Senior Backend Engineer (Kotlin), you'll be responsible for facilitating the transition from a localized setup with regional banks to a unified Global Bank. You will have substantial influence on the design of our global platform, ensuring it's optimized for scalability, reliability, and security to meet the needs of our expanding user base. The challenge lies in executing all three tasks—redesigning, introducing new features, and scaling operations—simultaneously. If you're up for this multifaceted challenge, we'd love to hear from you.

What You’ll Do

• Co-design and develop our global platform by engaging in collaborative efforts with cross-functional teams to optimize scalability, reliability, and security for our global banking platform.
• Design REST APIs and build highly available event-driven systems.
• Work in a global context with teams in Europe, the US, and Latin America.
• Collaborate with a cross-functional team to clarify problems, outline opportunities, prototype solutions, ensure smooth deployment, continuous integration, and support existing functionalities.
• Actively participate in the selection of new tools, technologies, and processes, code reviews, and pair programming with other software engineers.
• Become a subject matter expert and actively participate in product discussions to assist your team in delivering business value by making the best backend-related decisions.
• Continuously raise the bar by mentoring fellow backend engineers, driving engineering initiatives, adopting and actualizing best practices with the team, and fostering a strong, collaborative engineering culture that emphasizes continuous learning.

You’ll Be Great for This Role If

• You have solid experience as a Senior Backend Engineer, proficient in both Java & Kotlin.
• You have proven experience in software architecture and application design, with a track record of making architectural decisions and a deep understanding of fundamental system architecture and API design (RESTful and event-driven services).
• You have hands-on experience with CI/CD pipelines and version control systems, demonstrating your familiarity with DevOps practices.
• You feel comfortable working with SQL databases.
• You have a good understanding of modern cloud technologies (AWS, Docker, Kubernetes).
• You have experience with monitoring tools such as Prometheus, Grafana.
• You have a passion to write clear, concise, and testable code that your team can understand, maintain, and improve.

Why You Should Join SumUp

• The opportunity to work on large-scale fintech products used by millions of small businesses around the world.
• Work on a high-impact squad that is at the core of the Bank Tribe.
• A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education.
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success.
• You'd enjoy other great location-tailored benefits.
• You’ll attend global offsites and/or hackathons.
• Join a truly global SumUp team of 3200+ people from 80+ countries, spread across 4 continents.

Job Application Tip

We recognize 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 okay too because it means you have room to learn and develop your career at SumUp.