Responsibilities
- Design and evolve reliable, scalable systems that process millions of transactions.
- Build and maintain backend services within a microservices architecture.
- Contribute to API design for internal services and external integrations.
- Write clean, maintainable, scalable code with strong test coverage.
- Participate in architectural discussions and drive technical decisions.
- Collaborate with engineers, QA, and DevOps to deliver production-ready systems.
- Improve engineering practices, including using AI to iterate faster.
Requirements
- Strong programming experience in a modern language such as Go, Java, Python, or Kotlin.
- Solid understanding of system design, scalability, and distributed systems.
- Experience building APIs and working with data storage systems.
- Ability to learn new technologies quickly and pragmatically.
- Strong problem-solving skills and a structured approach to thinking.
- Ownership mindset and collaborative approach to teamwork.
- Interest in incorporating AI into the development workflow.
- Nice-to-have experience with AWS, Docker, Kubernetes, event-driven systems, or Kafka.
Benefits
- Sofia office-based role with an office-first setup.
- €2,000 annual learning and development budget.
- 25 days of paid leave, increasing with tenure, plus paid special-occasion leave and a one-month sabbatical every three years.
- Health and life insurance, co-sponsored Multisport cards, childbirth and adoption bonuses, discounts, and a referral program.
- 100 EUR monthly food vouchers and 40 EUR flexible benefits.
Categories
About SumUp
SumUp is a leading global fintech company committed to levelling the playing field for small businesses. Founded in 2012, we’re the trusted partner of over 4 million merchants in 37 markets, providing simple and affordable tools that help them manage payments, finance, and customer relationships. Our vision is a world where everyone can build a thriving business. Guided by this, we champion small business ownership by creating accessible solutions that empower entrepreneurs to grow and succeed. Our diverse team of over 3,000 SumUppers — representing more than 90 nationalities across 20 offices worldwide — is at the heart of our success. Beyond business, we donate 1% of the net revenue generated by Solo devices to environmental causes and support educational and entrepreneurial initiatives around the world. Recognised as a Top Global Employer for inclusion by the Stonewall Workplace Equality Index in 2022 and 2023, and awarded Fintech Diversity Initiative of the Year at the Irish National Fintech Awards in 2025, SumUp continues to build an inclusive, supportive, and purpose-driven workplace where everyone belongs.