Senior Fullstack Engineer - Global Operations

Location: Berlin, in-office

Our team is part of the Global Operations organization, where our mission is to create the best customer experience in the fintech industry by delivering effortless and seamless solutions to our merchants. We focus on redefining how customer support operates by building state-of-the-art tools and systems that empower our users and enhance their journey.

The Full Stack Engineering team is at the heart of this mission, playing a pivotal role in designing and delivering scalable, secure, and intuitive features across both frontend and backend ecosystems. We work closely with cross-functional teams—including product managers, designers, and engineers across platforms (mobile, frontend, and backend)—to build innovative tools and experiences that simplify customer support and drive efficiency.

This role is part of a well-established and collaborative team comprising a Product Manager, Engineering Manager, Designer, Android and iOS developers, Frontend engineers, and Backend engineers. As a Full Stack Engineer, you’ll have the unique opportunity to contribute across the entire stack, ensuring seamless integration, robust functionality, and an outstanding user experience for merchants worldwide.

What you’ll do

• Build and maintain innovative features across both the frontend and backend to enhance the customer support funnel, delivering seamless and impactful user experiences
• Collaborate with stakeholders to design and implement consistent APIs, WebSocket connections, and AI-powered functionality that integrates seamlessly across platforms
• Write clean, efficient, and scalable code for both user-facing interfaces and backend services, ensuring high performance and reliability
• Develop robust unit and integration tests to maintain the quality and stability of deliverables across the entire stack
• Implement tracking for analytics and configure A/B tests to assess feature success and drive informed decision-making
• Monitor system performance end-to-end, establish alerts, and proactively troubleshoot issues to maintain reliability and uptime
• Ensure consistency in design and functionality by aligning implementations with the overall product vision and standards

You’ll be great for this position if you

• Have 5+ years of programming experience with TypeScript and Golang, building scalable and efficient applications
• Are proficient in building and consuming RESTful APIs and working within a microservice environment
• Have hands-on experience with SQL databases like PostgreSQL and event-driven architectures using tools such as Kafka
• Are comfortable working with Docker and Kubernetes for containerization and orchestration
• Have experience implementing CI/CD pipelines for seamless integration and deployment processes
• Are familiar with monitoring and debugging tools such as Grafana, Honeycomb, and Sentry to ensure system reliability and performance
• Thrive in a collaborative, cross-functional team environment where mutual empowerment and growth are core values
• Demonstrate high autonomy, excellent communication skills, and the ability to prioritize and focus on impactful work
• Go beyond writing code by caring deeply about delivering value to merchants, embracing a product-focused mindset, and maintaining a proactive, can-do attitude

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
• 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
• 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
• 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

About us

SumUp is a leading financial technology company, founded in 2012 with the goal of empowering small businesses around the globe. We’re the financial partner of choice for more than 4 million merchants in over 35 markets. We collectively build, plan and fine-tune the technology that drives SumUp and empowers small businesses around the world.

We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their business. With a founders mentality and a 'team-first attitude' our diverse teams across Europe, South America, and the United States work together to ensure that small business owners can be successful doing what they love.

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.