Fullstack Engineer - Partnership & Enterprise

Berlin, Germany

The Partnership and Enterprise squad is building the infrastructure that powers SumUp's partner channel, a business that supports around 800 active partners and is growing fast. As the squad's Senior Full-Stack Engineer, you'll take end-to-end ownership of the Partner Portal, the product that sits at the heart of how SumUp's partners manage their merchants, fees, and operations. This is an opportunity with real scope: you'll shape technical direction, collaborate closely with CRM engineers and product stakeholders, and ship features that directly reduce operational friction for the teams driving SumUp's sales growth.

What you'll do:

• Build and own the Partner Portal's frontend using React, TypeScript, and Next.js, creating fast, reliable, and well-structured user-facing experiences

• Design, build, and maintain the services and microservices that power the portal, ensuring reliability and high availability at scale

• Write and maintain back-end APIs, services, and data pipelines in TypeScript and Go that are scalable and built to support a fast-growing global platform

• Develop fee management functionality and other high-impact features that directly reduce the administrative burden on partner management teams

• Implement monitoring and alerting, and follow up on incidents to keep the platform stable and performant

• Collaborate with colleagues and stakeholders across the Partnerships team to identify areas of improvement, collect feature requests, and shape solutions

• Actively contribute to code reviews, team ceremonies, and chapter rituals, sharing context and knowledge across engineering disciplines to avoid silos

You'll be great for this role if:

• You have proven experience with TypeScript and React, building scalable, production-grade full stack applications using frameworks such as Next.js, Remix, Nuxt, or similar

• Solid experience designing and working with RESTful APIs and complex microservice systems, with comfort navigating and refactoring large codebases

• Solid knowledge of Go, or strong experience with another backend language such as Node.js, used to build reliable, performant backend services

• Experience as a Kubernetes user, with familiarity in CI/CD pipelines and infrastructure tooling such as Terraform

• Comfort working closely with CRM systems or adjacent tooling (e.g. Salesforce), and an openness to bridging the gap between CRM engineering and full stack development

• A product mindset, connecting technical decisions to real business outcomes, and a genuine sense of ownership over the features you build from planning through to maintenance

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

• 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success

• 📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education

• 💶 A corporate pension scheme where we match up to 20% of your contributions

• 🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days

• 🏙 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches

• 🌴 Break4me: 1-month sabbatical after 3 years of service

• 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team