Senior Backend Engineer - MarTech

About the team: The MarTech team builds the marketing and growth systems that help SumUp reach more merchants around the world. We combine backend engineering, data engineering, data science and external marketing platforms to create reliable, scalable solutions that improve conversion, increase operational efficiency and unlock new acquisition channels. Our work spans recommendation engines, promotion management, affiliate and referral platforms, campaign feed publishing, creative automation, localization and conversion tracking integrations that send signals to advertising platforms. We validate early ideas and prototypes into production-grade products that marketing teams can use independently, reducing manual work and helping campaigns reach customers faster. You will join a diverse and distributed team that works closely with stakeholders across Acquisition Engineering squads, Online Marketing, Content & Localization, Engagement and Platform Infrastructure. Because our systems sit at the intersection of technology, data and business growth, you will work on meaningful problems with multiple technical dependencies and a visible impact on SumUp’s acquisition strategy. What you’ll do: Design, build and operate reliable backend services that support marketing and growth initiatives. Own features and engineering projects from discovery and technical design through delivery and production support. Build integrations with internal and external platforms, ensuring reliable data flows and maintainable interfaces. Define and evolve architectures for distributed services and event-driven systems. Improve the reliability, quality and operational excellence of existing services. Collaborate with technical and non-technical stakeholders to clarify requirements, communicate trade-offs and shape priorities. Contribute to a high standard of engineering through testing, code reviews, documentation and pragmatic technical decisions. Support the growth of the team by pairing with peers, sharing knowledge and mentoring less experienced engineers. You’ll be great for this role if you have: 5+ years of professional backend engineering experience. Strong experience with Go and the wider Go ecosystem. Hands-on experience with distributed systems, microservices and event-driven architectures. Experience with event-streaming platforms and messaging brokers such as Kafka. Practical experience with DevOps practices and CI/CD tools, for example GitHub Actions or Argo CD. Experience building new systems while also maintaining and improving legacy services. A strong understanding of software architecture, service boundaries, APIs, data flows, testing and production operations. Excellent written and verbal communication skills, with the ability to explain technical concepts and trade-offs to both technical and non-technical stakeholders. Proven stakeholder-management skills and a collaborative approach to problem-solving. A strong sense of ownership and a commitment to writing clear, maintainable and testable code. Curiosity and enthusiasm for solving meaningful problems for users and the business. Nice to have: Experience in marketing technology, growth, acquisition or advertising platforms. Familiarity with React, TypeScript, or Python. Experience in fintech or a related industry. Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin 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 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by Company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. About us: Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website , and follow our journey on LinkedIn and Instagram . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.