(Senior/Mid) Software Engineer, Golang

About the role

<p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">SumUp</strong> enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive. </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn">The <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">payments processing platform,</strong> consisting of other sub-platforms, has powered SumUp's global business for more than 10 years now. It's developed in Sofia by the Payments Tribe, composed of several teams (squads). Each squad is cross-functional, autonomous and co-located, working on its part of the platform <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">end-to-end.</strong> </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn">We are scaling and improving existing products, while developing <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">new</strong> ones - an exciting time to join. The listing location is Sofia, Bulgaria.

Key facts

What you'll do

• <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">SumUp</strong> enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently.
• We create the tools businesses need to make their business and their customer experience thrive. </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn">The <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">payments processing platform,</strong> consisting of other sub-platforms, has powered SumUp's global business for more than 10 years now.
• It's developed in Sofia by the Payments Tribe, composed of several teams (squads).
• Each squad is cross-functional, autonomous and co-located, working on its part of the platform <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">end-to-end.</strong> </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn">We are scaling and improving existing products, while developing <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">new</strong> ones - an exciting time to join.
• You would make an impact by improving and co-creating our existing and new <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">microservices architecture</strong> platforms, solving scaling and new development challenges. <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">Scalability</strong> and <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">high availability</strong> are among our focus areas. </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">What you'll do</strong></p> <ul class="cui-list-9zvq cui-list-one-q5ny css-15v5cj3 e1itouxg4"> <li>Design and evolve systems that process millions of transactions reliably and at scale</li> <li>Build and maintain backend services in a microservices architecture</li> <li>Contribute to API design for internal services and external integrations</li> <li>Write clean, maintainable, and scalable code with strong test coverage</li> <li>Participate in architectural discussions and drive technical decisions</li> <li>Collaborate closely with engineers, QA, and DevOps to deliver production-ready systems</li> <li>Continuously improve engineering practices, including leveraging AI to iterate faster</li> </ul> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">You will be great for this role if you have:</strong></p> <ul class="cui-list-9zvq cui-list-one-q5ny css-15v5cj3 e1itouxg4"> <li>Strong programming experience in any modern language (e.g.
• We care more about how you think and design systems than the specific language you use</li> <li>Solid understanding of system design, scalability, and distributed systems</li> <li>Experience building APIs and working with data storage systems</li> <li>Ability to learn new technologies quickly and pragmatically</li> <li>Strong problem-solving skills and a structured way of thinking</li> <li>Ownership mindset and collaborative approach to teamwork</li> <li>Interest in incorporating AI as part of your development workflow</li> </ul> <p><strong>Nice to have:</strong></p> <ul> <li>Experience with cloud platforms (e.g.
• AWS)</li> <li>Familiarity with containers and orchestration (Docker, Kubernetes)</li> <li>Experience with event-driven systems and messaging (e.g.
• Kafka)</li> </ul> <p>If you don't meet every requirement but are excited about the role, we'd still love to hear from you.</p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">Why you should join SumUp</strong></p> <ul> <li class="cui-body-o5xe cui-body-m-mwmz cui-body-regular-hd7o cui-body-normal-pvqj css-k4eprn">Make an impact on a global scale - our syst

Requirements

• We create the tools businesses need to make their business and their customer experience thrive. </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn">The <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">payments processing platform,</strong> consisting of other sub-platforms, has powered SumUp's global business for more than 10 years now.
• You would make an impact by improving and co-creating our existing and new <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">microservices architecture</strong> platforms, solving scaling and new development challenges. <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">Scalability</strong> and <strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">high availability</strong> are among our focus areas. </p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">What you'll do</strong></p> <ul class="cui-list-9zvq cui-list-one-q5ny css-15v5cj3 e1itouxg4"> <li>Design and evolve systems that process millions of transactions reliably and at scale</li> <li>Build and maintain backend services in a microservices architecture</li> <li>Contribute to API design for internal services and external integrations</li> <li>Write clean, maintainable, and scalable code with strong test coverage</li> <li>Participate in architectural discussions and drive technical decisions</li> <li>Collaborate closely with engineers, QA, and DevOps to deliver production-ready systems</li> <li>Continuously improve engineering practices, including leveraging AI to iterate faster</li> </ul> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">You will be great for this role if you have:</strong></p> <ul class="cui-list-9zvq cui-list-one-q5ny css-15v5cj3 e1itouxg4"> <li>Strong programming experience in any modern language (e.g.
• We care more about how you think and design systems than the specific language you use</li> <li>Solid understanding of system design, scalability, and distributed systems</li> <li>Experience building APIs and working with data storage systems</li> <li>Ability to learn new technologies quickly and pragmatically</li> <li>Strong problem-solving skills and a structured way of thinking</li> <li>Ownership mindset and collaborative approach to teamwork</li> <li>Interest in incorporating AI as part of your development workflow</li> </ul> <p><strong>Nice to have:</strong></p> <ul> <li>Experience with cloud platforms (e.g.
• AWS)</li> <li>Familiarity with containers and orchestration (Docker, Kubernetes)</li> <li>Experience with event-driven systems and messaging (e.g.
• Kafka)</li> </ul> <p>If you don't meet every requirement but are excited about the role, we'd still love to hear from you.</p> <p class="cui-body-o5xe cui-body-one-cjrz css-k4eprn"><strong class="cui-body-o5xe cui-body-one-cjrz cui-body-highlight-kmah css-10dm8y e1itouxg2">Why you should join SumUp</strong></p> <ul> <li class="cui-body-o5xe cui-body-m-mwmz cui-body-regular-hd7o cui-body-normal-pvqj css-k4eprn">Make an impact on a global scale - our syst

About SumUp

We build tools that help small businesses accept payments and manage their finances. You will work with teams that design, ship, and improve these products, focusing on clear user behavior and thoughtful interactions.

You care about clean architecture, writing maintainable code, and eager to contribute meaningfully to the growth of a fast-moving fintech company. You will collaborate across product, design, and operations to deliver reliable experiences.

Software engineering work usually means turning product intent into systems that run in production. Engineers write and review code, break large changes into reviewable pieces, and watch how those changes behave after they ship. Most teams share on-call or incident habits so outages get a clear owner. Collaboration with product and design is part of the job, not an extra. The duties above are the ones this listing actually states for this opening.