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About the Role

The Global Expansion Acquiring Squad is responsible for SumUp's growth into new markets, integrating local payment acquirers, enabling merchant onboarding, and ensuring reliable transaction flow. This role involves owning critical backend systems and shaping the squad's work through AI agents and developer tooling.

Responsibilities

• Design and build scalable backend services in Golang and Kotlin, covering merchant onboarding, transaction processing, and reconciliation across multiple acquirers and markets.
• Lead technical investigations for new market launches and mentor engineers on the team.
• Configure and maintain AI coding assistants (Cursor, Copilot, Continue) with team-specific rules, framework conventions, and testing patterns.
• Build AI agents that automate repetitive development tasks, such as generating integration stubs, updating OpenAPI specs, and flagging idempotency violations.
• Keep documentation accurate and AI-accessible.

Requirements

• Strong proficiency in Golang (primary) or a JVM language such as Java or Kotlin, with experience building distributed, fault-tolerant backend systems.
• Experience configuring AI coding assistants at a team level — defining rules, prompts, and context packages that produce consistent, framework-compliant output.
• Solid understanding of idempotency, retry policies, and transaction safety in payment or financial systems.
• Comfort working across multiple teams and domains simultaneously, navigating ambiguity and influencing without direct authority.
• A track record of taking ownership in complex, cross-functional environments where the scope isn't always clearly defined.

Skills

• Golang
• Kotlin
• Java
• Distributed systems
• Fault-tolerant systems
• AI coding assistants
• Idempotency
• Retry policies
• Transaction safety
• Cross-functional collaboration

Location

• Berlin

Work Type

• Office-first

Experience Level

• Senior

Benefits

• Virtual Stock Option programme
• Annual L&D budget of €2,000
• Corporate pension scheme (20% match)
• 28 days of paid leave plus public holidays and special leave days
• Urban Sports Club subsidy
• Kita placement assistance
• Subsidised office lunches
• 1-month sabbatical after 3 years of service
• Referral Bonus

About the Company

• SumUp empowers small businesses globally with simple and affordable tools. Over 4 million businesses in 37 markets use SumUp for payments, finance, and customer relationships. The company has over 3,000 employees from over 90 nationalities, fostering global collaboration and innovation. SumUp values inclusivity and a continuous learning culture, creating a safe space for growth. Their differences make them unique and strong, striving for an environment where everyone belongs and feels supported.

Equal Opportunity

• SumUp is an Equal Employment Opportunity employer, actively seeking and embracing diversity. Hiring and employment decisions are not based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other protected characteristic. SumUp is committed to creating a safe and respectful workplace where harassment is strictly prohibited.