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About the Role

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.

Responsibilities

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

Requirements

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

Skills

React
TypeScript
Next.js
Go
Node.js
Kubernetes
CI/CD
Terraform
RESTful APIs
Microservices

Location

Berlin

Work Type

Office-first

Experience Level

Senior

Benefits

Virtual Stock Option programme
Annual L&D budget of €2000
Corporate pension scheme (20% match)
28 days of paid leave plus public holidays and special leave days
Urban Sports Club subsidy
Kita placement assistance
Subsidised office lunches
1-month sabbatical after 3 years of service
Referral Bonus

About the Company

SumUp empowers small businesses across the globe by providing simple and affordable tools that allow them to thrive.
Over 4 million businesses in 37 markets rely on SumUp as their financial partner.
The team consists of over 3,000 SumUppers from over 90 nationalities.
Core values foster inclusivity and a continuous learning culture.
SumUp is committed to creating an environment where everyone belongs and feels supported.

Equal Opportunity

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce.
Hiring and employment decisions are not made 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.
The company is committed to creating a safe and respectful workplace where harassment of any form is strictly prohibited.