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About the Role

The Sidekick team builds and owns the progressive web app that SumUps field sales agents rely on every day, a tool that brings together everything a seller needs in one place: creating offers on the go, signing up new merchants, managing hardware sales, and tracking commissions in real time. It's one of our most impactful internal products, sitting at the heart of a primary revenue driver for the business. As our Senior Full Stack Engineer, you'll take genuine ownership of features end-to-end, from scoping through to production, working closely with product, engaging directly with sales stakeholders, and having a real say in what gets built and why. If you want autonomy, meaningful scope, and work that directly enables the people driving SumUp's growth, this is the role.

Responsibilities

Build and maintain full-stack features for the progressive web app, including field sales experience, back office tooling, and LLM-powered support, from scoping to production.
Actively participate in product discovery, user research, data review, and prioritization discussions.
Collaborate with sales stakeholders to understand needs, differentiate requirements, and propose solutions with clear trade-offs.
Contribute to raising engineering standards through documentation, code quality, and process improvements.
Integrate with external systems like Salesforce and shape data flow for a consistent field seller experience.

Requirements

Strong, proven experience with React and TypeScript in building scalable, maintainable production applications.
Hands-on experience with full-stack frameworks (e.g., Next.js, Remix, Nuxt) and a track record of shipping end-to-end features.
Experience building or consuming RESTful APIs and working within complex microservice systems.
Comfortable with Kubernetes and exposure to cloud-native, distributed environments.
Experience working in a product-led or dual-track agile team, contributing to both product and technical decisions.
Natural tendency to engage stakeholders, ask pertinent questions, and demonstrate empathy for the end user experience.
Comfortable showcasing and demoing work, with a focus on simplification and automation.

Location

Berlin office
Office-first setup

Work Type

Office-first setup

Experience Level

Senior

Benefits

Opportunity to work globally on large-scale fintech products.
Commitment to Diversity and Inclusion, fostering an inclusive environment.
Virtual Stock Option program.
Annual L&D budget of €2000 for individual development and further education.
Corporate pension scheme with up to 20% contribution matching.
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 (Break4me).
Referral Bonus program.

About the Company

Empowering small businesses globally with simple, affordable tools.
Over 4 million businesses in 37 markets rely on SumUp for payments, finance, and customer relationships.
Diverse team of over 3,000 SumUppers from over 90 nationalities.
United by global collaboration and an innovative mindset.
Core values shape work culture and drive success.
Fosters inclusivity and a continuous learning culture.
Provides a safe space for personal and professional growth.
Strives to create an environment where everyone belongs and feels supported.

Equal Opportunity

SumUp is an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce.
Hiring and employment decisions are not based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age, or any other protected basis.
Commitment extends to creating a safe and respectful workplace where harassment of any form is strictly prohibited.