Backend Engineer (Golang) - Balance Management

United States Digital Space LLC; Berlin; Vor Ort; EUR 90.000 - 130.000; Vollzeit

Zusammenfassung

United States Digital Space LLC is seeking a Backend Engineer to help modernize global banking services, focusing on scalable ledger and transaction history platforms. You’ll own services from design to production and collaborate across Risk, Treasury, Finance, and Infrastructure.

Proficiency in Golang, Docker, Kubernetes, AWS, and PostgreSQL is required, with a taste for tying together APIs, data models, and resilient systems that meet high-load demands.

Qualifikationen

• Solid backend experience building reliable, high-volume services.
• Proficient in Golang; comfortable learning Kotlin/Elixir as needed.
• Maintainable, well-tested code; CI/CD practices; production ownership.
• Experience deploying in AWS using Docker and Kubernetes.
• Interest in relational databases, performance and data consistency.

Aufgaben

• Build and evolve core banking services powering ledger operations and transactions.
• Tackle complex distributed systems challenges for resilience under high load.
• Improve observability, test coverage, and refactor code for long-term maintainability.
• Contribute to architecture decisions for globally scalable banking solutions.
• Collaborate across Risk, Treasury, Finance, and Infrastructure for compliant operations.
• Take ownership from design to production and monitor performance.

Kenntnisse

Backend experience

System design

APIs

Data modeling

Service interaction

Tools

Docker

Kubernetes

AWS

PostgreSQL

Jobbeschreibung

At the company, the Global Bank team builds the core infrastructure and services that give merchants a digital bank account, helping small businesses manage their money easily and reliably.

The Balance Management Squad sits at the core of the Global Bank Platform. Right now, our team is completing a major milestone: consolidating and modernizing our balance management system in Europe. The next big step is creating a global transaction history service; a single, shared platform used by all regions to give merchants consistent and transparent views of their financial activity.

As a Backend Engineer, you’ll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations.

If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we’d love to hear from you.

What You’ll Do

Build and evolve the company’s core banking services that powers ledger operations and transactions, transforming our regional systems into a unified, scalable global platform.

Tackle complex distributed systems challenges, ensuring resilient services that continue to perform under high transaction volumes.

Support modernization initiatives by improving observability, adding test coverage, refactoring code for long-term maintainability, and gradually introducing new architectural patterns without disrupting live banking operations.

Contribute to key architectural decisions - build ledger and transaction history systems from the ground up, ensuring a globally scalable banking solution for our clients.

Collaborate with teams across Risk, Treasury, Finance, and Infrastructure to ensure smooth, compliant, and reliable global operations

Take ownership from design to production, running the services you build, monitoring their performance, and continuously improving how we deliver high-quality software at scale.

You’ll be great for this role if

You have solid backend experience building reliable, high-volume services and you think carefully about system design, APIs, data modeling, and how services interact.

You are proficient in Golang and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir.

You write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production.

You’re comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes.

You’re eager to learn about relational databases that perform well under load and maintain data consistency.

You are a collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together.

You have a curiosity for building reliable financial services and banking domain

It’s a plus if you have

Knowledge of Elixir - some of our legacy services are written in Elixir, and while it's not essential, it would be useful if you've worked with it before

Deeper PostgreSQL experience - we rely heavily on Postgres, so if you've done performance tuning, complex queries, or schema design, that's a plus

Experience with event streaming platforms (Kafka preferred) and modern observability stacks (Grafana, Honeycomb, etc.)

Why you should join the company

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.

Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of the company merchants all over the world

Career growth and learning opportunities:

We invest in your development through regular training, mentorship programs, the company University leadership cohort and a yearly learning budget (2,000 EUR)

Sabbatical program for tenured SumUppers

Join a global team where you belong:

Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more

Health & wellness benefits:

in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions

A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc.

Enrollment onto our virtual stock ownership program - you will own a stake in the company’s future success

About the company

Be empowered to do more that matters.

At the company, we're on a mission to empower small businesses across the globe by providing a vast set of simple and affordable business tools to help them start, run, and grow their businesses. Today, over 4 million businesses in 36 markets rely on the company as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster an inclusivity and continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.

the company is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, .

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 the company.