Backend Engineer; Golang - Global Bank Sofia, Bulgaria

In the Global Bank tribe , we are building the infrastructure and core services needed to provide our merchants with a digital bank account that empowers 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 their needs - effortless, simple, and affordable.

Joining the Global Bank tribe means playing a key role in helping us build Sum Up's digital bank. You’ll collaborate with a global, autonomous, cross-functional team that refines an aspect of our product from concept to execution. Work alongside colleagues from 32 nationalities across Cologne, Berlin, São Paulo, Sofia, London and Vilnius, united by a shared commitment to taking ownership, working with purpose, and helping small businesses thrive.

As a Senior Backend Engineer, you'll be responsible for evolving and maintaining a high-throughput banking ecosystem for merchants inside our Global Bank Tribe. You’ll play a key role in architecting and evolving our global banking platform; ensuring high availability, scalability, and observability across multiple regions.

If you'd like to gain experience building business accounts, card payment, and transfers products etc, across Europe and Latam for Sum Up's Global Bank, join us and be part of this exciting journey!

What You’ll Do

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

Be part of the transformation team that is transforming monolithic services into decoupled, highly scalable, region-agnostic, unified global bank services

Design, implement, and iteratively develop highly available backend services, while continuously evaluating and implementing new methods to ensure the high reliability of transfer systems

Maintain and improve core services utilizing a modern, cloud-native technology stack (AWS, K8s), with microservices written in Golang, Kotlin and Java and Elixir.

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

Shape and continuously improve our engineering culture by sharing ideas, refining best practices, exploring innovative solutions, and contributing to comprehensive documentation and tool selection.

You’ll be great for this role if

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

You have advanced understanding of developing and maintaining distributed and event-driven systems.

You have solid experience with event streaming platforms and messaging brokers such as Kafka

You have experience with modern cloud technologies like AWS, and containerization tools such as Docker and Kubernetes

You feel comfortable working with SQL and No

SQL databases

You are experienced with CI/CD tools like Git Hub Actions or ArgoCD

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

Your curiosity and enthusiasm for solving meaningful challenges for users and a commitment to collaboration and continuous learning.

You are comfortable pairing with your peers on a day-to-day basis, sharing knowledge and learning from each other, fostering the culture of knowledge sharing

Why you should join Sum Up

Be part of a company that values diversity and celebrates unique perspectives.

Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.

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.

Career growth and learning opportunities:
We invest in your development through regular training, mentorship programs, Sum Up University leadership cohort and a yearly learning budget (2,000 EUR)

Enrollment onto our virtual stock ownership program -…