2 months ago
Sofia, BulgariaSenior
Responsibilities
- Develop new functionality and maintain existing services across the codebase, primarily using Go.
- Advance the merchant risk decision framework beyond its MVP for fraud prevention, risk, and compliance use cases.
- Design, build, and maintain reliable distributed systems and backend services.
- Collaborate with product managers, data scientists, machine learning engineers, fraud strategy teams, and operational stakeholders.
- Shape technical direction, service boundaries, and system design decisions.
- Contribute to Python projects, including AI-agent initiatives.
- Participate in code reviews, testing, monitoring, and continuous improvement of production services.
- Use AI-assisted development tools while maintaining code quality, security, and maintainability.
- Be open to participating in an on-call rotation as production responsibilities evolve.
Requirements
- Professional experience developing software with Go/Golang.
- Experience building and operating distributed systems and backend services.
- Strong system design skills and understanding of reliable, maintainable software architecture.
- Experience with Kubernetes and Kafka.
- Working knowledge of Python and interest in Python-based products or AI-agentic development.
- Experience using AI-assisted tools in software development.
- Experience working in agile, cross-functional teams and with non-engineering stakeholders.
- A pragmatic, outcome-focused approach to defining MVPs, making trade-offs, and iteratively improving solutions.
- Collaborative communication skills and willingness to challenge ideas constructively.
- Motivation to learn about fintech, fraud prevention, risk, and compliance.
Benefits
- Office-first work setup from SumUp’s Sofia office.
- €2,000 annual learning and development budget for conferences or further education.
- Enrollment in the VSOP program with an ownership stake in SumUp’s future success.
- 25 days of paid leave, increasing by one day per year of service up to 35 days, plus public and special leave.
- 30-day sabbatical after completing three years of employment.
- Tax-free food vouchers and flexibility through the Re:Benefits platform.
- Free shuttle buses to Joliot-Curie metro station.
- Additional health and life insurance.
- On-site yoga and a co-sponsored Multisport card.
- Hack Days every second Friday and global Hack Weeks.
- Referral bonus program.
Tech Stack
Categories
About SumUp
SumUp builds card readers, point-of-sale apps, and payment tools for small businesses, along with accounts, invoicing, and online checkout. It sells hardware and earns fees on payment processing and subscriptions for software and services such as invoicing and loyalty. Founded in 2012 and headquartered in London, the company serves more than 4 million merchants across 30+ markets, and offers options like payment links and Tap to Pay.