(Senior) Backend Engineer - Golang

Навыки

• Agile
• Распределённые системы
• Go
• Kafka
• Kubernetes
• Machine Learning
• Room / Realm / CoreData

О компании и продукте

• We are the Merchant Risk Intelligence team within SumUp’s Risk & Compliance tribe. We build systems that help protect SumUp and its merchants from fraud while supporting reliable, compliant business growth.
• Our team combines software engineering, machine learning, data science, product management and risk expertise. You will join a multidisciplinary group currently working across backend services, data products and AI-powered solutions. The team is growing its software engineering capabilities to develop Sentinel, our entity-level investigation and actioning framework, and to support broader risk and compliance use cases.
• You will bring dedicated Golang expertise to the team while also contributing to Python-based services and AI-agent initiatives. We value pragmatic engineering, thoughtful collaboration and the ability to balance delivery speed with security, reliability and long-term maintainability.
• Be empowered to do more that matters.

Задачи

• Develop new functionality and support existing services across the tribe’s codebase, primarily using Go
• Contribute to the continued development of our in-house merchant risk decision framework, taking it beyond its MVP and enabling new fraud prevention, risk and compliance use cases
• Design, build and maintain reliable distributed systems and backend services
• Work closely with product managers, data scientists, machine learning engineers, fraud strategy teams and operational stakeholders to turn complex problems into practical solutions
• Help shape technical direction, service boundaries and system design decisions across the team
• Contribute to Python projects, including AI-agent initiatives, as you build a broader understanding of the team’s systems
• Participate in code reviews, testing, monitoring and continuous improvement of production services
• Use AI-assisted development tools thoughtfully to deliver meaningful features faster without compromising code quality, security or maintainability
• Be open to participating in an on-call rotation as the team’s production responsibilities and support model evolve
• You’ll be great for this role if you have
• Professional experience developing software with Go/Golang
• Experience building and operating distributed systems and backend services
• Strong system design skills and an understanding of reliable, maintainable software architecture
• Experience working with Kubernetes and Kafka
• Working knowledge of Python and an interest in contributing to Python-based products or AI/agentic development
• Experience using AI-assisted tools as part of your software development workflow
• Experience working in agile, cross-functional teams and collaborating with stakeholders beyond engineering
• A pragmatic, outcome-focused approach: you know how to define a valuable MVP, make sensible trade-offs and improve solutions iteratively
• A collaborative mindset and the confidence to challenge ideas constructively while remaining open to feedback
• Motivation to learn about fintech, fraud prevention, risk and compliance domains
• Why you should join SumUp
• Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Sofia office
• This involves an office-first setup
• We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks
• Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

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