Join the b2venture community at one of our portfolio companies. See all open positions below.

Interested in working directly for b2venture? Learn more.

Senior Backend Engineer (Golang) - Global Bank



Software Engineering
Sofia, Bulgaria
Posted on Thursday, June 22, 2023

In the Global Bank tribe, we are building the infrastructure and core services needed to provide our merchants with a digital bank account that allows them to be successful at doing what they love. Our goal is to become the most popular banking partner for small merchants globally by offering a high-quality banking experience tailored to small business needs - effortless, simple, and affordable.

Joining the Global Bank tribe means you’ll play a key part in helping us build SumUp's own digital bank. Be part of a global, autonomous, cross-functional team that takes an aspect of our product and perfect it from concept to execution. Working alongside a global team with 32 nationalities across Cologne, Berlin, São Paulo, Sofia and Vilnius who love to take ownership, work with purpose, and help businesses thrive.

As a Senior Backend Engineer (Golang), you will be responsible for supporting the transition from a localized setup with regional banks to a unified Global Bank. One of the main challenges will be to support our move to fully distributed, event-driven architecture.

What You’ll Do

  • Collaborate with the global team to design and build a unified global platform, including high-level APIs for multiple regions and local implementations, ensuring high availability and observability.

  • Build and maintain these highly available, self-healing, and resilient event-driven systems.

  • Support the migration of systems and processes, ensuring zero downtime for clients, and design, implement, and support high-value features for customers.

  • Improve test coverage for existing services and own the end-to-end delivery of changes, including testing, observability, and monitoring.

  • Continuously improve our engineering culture by refining best practices, clarifying problems and opportunities, prototyping solutions, providing comprehensive documentation and selecting new tools and technologies.

You’ll be great for this role if you have

  • Solid programming experience in Golang and are interested in working with additional languages such as Java, Kotlin and Elixir.

  • Extensive experience as a Backend Engineer specializing in distributed, fault-tolerant, and event-driven systems.

  • Proven experience in system design, data modeling, and API design.

  • Hands-on experience with Kafka, Postgres, and SQL databases.

  • Prior experience with modern cloud technologies (AWS, Docker, Kubernetes).

  • Experienced with CI/CD products such as GitHub Actions and ArgoCD.

  • You take pride in your work, have a keen sense of ownership, and are dedicated to writing clear, maintainable, and testable code.

  • You’re a product-focused engineer who is passionate and curious about solving user challenges.

Any of the following would be considered a plus

  • Experience with monitoring tools - Prometheus, Grafana, Honeycomb

  • Experience in the fintech industry

Why you should join SumUp

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

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

  • You’ll receive 25 days’ paid leave, plus 1 additional day for each year of employment.

  • You can take up to 10 days’ educational leave to expand your skill set.

  • A dedicated annual Learning & Development budget (2000Euro / year) 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

  • Access to the SumUp Sabbatical, our Employee assistance program for mental health

  • We offer additional health insurance, a subsidized Multisport card, free shuttle buses from Joliot-Curie metro station and other great benefits.

  • You’ll attend global offsites and/or hackathons

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.