Senior Backend Engineer (Golang) - Balance Management

ABOUT TALON.ONE:   Talon.One is the most powerful incentives engine that unifies loyalty, promotions and gamification into one holistic platform. Backed by enterprise-grade security and scalability, Talon.One empowers companies to build personalized, profitable promotions and loyalty programs using any data. Today, over 250 of the world’s most-loved brands including Adidas, Sephora and Carlsberg work with Talon.One to drive deeper engagement and lasting loyalty with their customers.   ABOUT THE TEAM: Talon.One’s R&D has a cross-functional group of engineers, product thinkers, and designers who build and scale the systems behind Talon.One’s platform. Each team owns a clear slice of our ecosystem, operating with autonomy and shared accountability. As part of the Platform Tribe, the Infrastructure team focuses on the foundations that power everything we build: Cloud Architecture, Kubernetes, Networking, Terraform, CI/CD, GitOps, and more. We design scalable, reliable, and secure systems so product engineers can move fast with confidence. We value curiosity, open collaboration, and mutual growth. Everyone has visibility into how things work end to end, and we encourage mentoring and knowledge sharing across disciplines. Talon.One is building an inclusive workplace where diverse perspectives shape better systems and better outcomes. We’re based in Berlin and welcome professionals already here or excited to relocate.   ABOUT THE ROLE: We’re looking for a Senior DevOps Engineer to join our Platform Tribe. You’ll help evolve the systems that keep Talon.One reliable, secure, and scalable. Our team uses a Kanban flow and a quarterly roadmap that balances long-term initiatives and iterative improvements. You’ll collaborate closely with infrastructure, platform, and product engineers to build resilient infrastructure, automate operations, and simplify cloud complexity. We value engineers who take ownership, bring proactive thinking to design discussions, and share knowledge openly. This is a hands-on role where reliability, automation, and thoughtful collaboration define success. WHAT WE NEED YOU TO BRING TO THE TABLE: * 5+ years of experience in a Cloud Infrastructure or DevOps Engineering role, with a strong record of building and maintaining production systems at scale. * Deep understanding of CI/CD pipelines, with hands-on experience improving automation, reliability, and developer workflows, ideally using tools like ArgoCD or similar GitOps-based deployment systems. * Expert knowledge of Docker and Kubernetes, including best practices for observability, scalability, and resilience. * Solid experience with cloud providers (preferably GCP) and a sound grasp of cloud-native architectures and infrastructure as code. * Experience with parts of our stack: Bash, Golang, PostgreSQL, and Git. * Experience with Datadog or Prometheus for monitoring and metrics. * High levels of ownership and autonomy, you execute independently, make pragmatic decisions, and follow through with consistency and care. * A genuine interest in mentoring others, sharing context, and raising the technical bar of the team through collaboration and knowledge transfer.   OUR TECHNOLOGY:  * Google Cloud Platform and GKE * PostgreSQL * BuildKite, ArgoCD * Go for our API & Custom Kubernetes Operators * Hashicorp ecosystem (Terraform, Vault, etc.) * Kafka and BigQuery for DataOps   WHAT'S IN IT FOR YOU: * 90+ team of engineers, product managers and product designers in Berlin * Leaders with 8+ years of experience building our promotions engine * €1,000 annual learning budget and free German language courses to boost your skills * 30 days of annual leave, plus extra paid days for your birthday and moving day * Home office setup budget, a monthly home office allowance * Freedom to work from abroad for up to 90 days worldwide! * Mental health support with nilo.health and a discounted Urban Sports Club membership * 20% company subsidy on your pension contributions * Subsidised BVG public transport ticket and a dog-friendly Berlin office where your furry friend is welcome * Lease your ideal bike through BusinessBike

About the team: You’ll join SumUp’s Merchant Intelligence squad within the Engagement Mission — a newly formed team building foundational backend services that create a shared source of truth for product and merchant data across the business. The team is focused on two core services: * Product Catalogue Service — a global source of truth for all products SumUp sells across every market, including hardware, subscriptions, and software, as well as market-specific feature and settings configuration. * Merchant Intelligence Service — a centralized platform that aggregates merchant data from across the SumUp ecosystem, helping teams understand the full merchant journey through product adoption, hardware sales, health signals, support interactions, and marketing cohorts. By building these services, the squad is solving a company-wide challenge: product and merchant data is currently fragmented across multiple systems and teams, creating duplication, inconsistency, and reliance on manual workarounds. The Merchant Intelligence squad is building the platform foundations that will help teams across SumUp move faster and make better decisions with reliable, centralized data. As a Senior Backend Engineer, you’ll help design and build these services from the ground up. You’ll work closely with product, data, and engineering teams across SumUp to create scalable systems that are reliable, easy to integrate with, and valuable to a broad range of internal users.   What you’ll do: * Design, build, and evolve foundational backend services that create a shared source of truth for product and merchant data across SumUp, with a strong focus on scalability, reliability, and ease of adoption by internal teams * Develop and maintain robust APIs, data models, and integration patterns that enable teams across the business to access consistent and trustworthy product and merchant information * Build and improve data ingestion, aggregation, and event-processing pipelines that bring together signals from across the SumUp ecosystem into actionable merchant intelligence * Contribute to shaping the long-term architecture and strategy for the Product Catalogue and Merchant Intelligence services, helping establish platform capabilities that can be used across multiple systems and teams * Write high-quality, maintainable backend code following engineering best practices for testing, observability, and production readiness * Collaborate closely with product managers, data teams, and engineers across SumUp to identify needs, solve complex data challenges, and turn them into effective technical solutions * Work across squad and domain boundaries to support integrations, improve data consistency, and enable better internal tools, workflows, and merchant experiences * Help define engineering standards, technical direction, and ways of working in a newly established squad operating in a complex and evolving domain   You’ll be great for this role if you have: * Strong professional experience in backend engineering, building and operating reliable production systems * Solid experience with Golang and designing scalable backend services * Strong knowledge of API design, system design, and data modeling * Hands-on experience with Postgres or similar relational databases * Experience with AWS, Docker, Kubernetes, and infrastructure-as-code tools such as Terraform * Familiarity with event-driven architectures and message brokers such as RabbitMQ or Kafka * A strong ownership mindset, with the ability to work independently and navigate ambiguity * Clear communication skills and a collaborative approach to working across product, data, and engineering teams 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.