Senior Full Stack Engineer - Sidekick

Senior Full Stack Engineer

About SumUp

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 37 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. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok.

What You'll Do:

• Build and maintain features across the full stack of our progressive web app, spanning the field sales experience, back-office tooling for sales agents, and emerging LLM-powered support tooling, owning work from scoping through to production.
• Participate actively in product discovery, joining user research sessions, reviewing usage data, and contributing to prioritization discussions alongside product.
• Work directly with sales stakeholders to understand their needs, distinguish between what's requested and what's actually needed, and propose solutions with clear trade-offs.
• Contribute to raising engineering standards across the team through documentation, code quality, and proactive process improvements.
• Integrate with external systems such as Salesforce where required, and help shape how data flows across domains to create a consistent experience for field sellers.

You'll Be Great For This Role If You Have:

• Strong, proven experience with React and TypeScript, building scalable, maintainable applications in a production environment.
• Hands-on experience with a full-stack framework (Next.js, Remix, Nuxt, or similar) with a clear track record of shipping real-world features end-to-end.
• Experience building or consuming RESTful APIs and working within complex microservice systems.
• Comfortable as a Kubernetes user, with exposure to working in cloud-native, distributed environments.
• Experience working in a product-led or dual-track agile team, contributing to product decisions, not just technical ones.
• A natural tendency to reach out to stakeholders, ask the right questions, and bring genuine empathy to the end user's experience.
• Comfortable showcasing and demoing work, and always looking for ways to simplify or automate where it makes sense.

Why You Should Join SumUp:

• Global Impact: Work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office (office-first setup).
• Diversity & Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment.
• Virtual Stock Option Programme: Own a stake in SumUp's future success.
• L&D Budget: A dedicated annual L&D budget of €2000 for your individual development.
• Pension Scheme: Corporate pension scheme with up to 20% employer match.
• Generous Time Off: 28 days of paid leave plus public holidays and special leave days.
• Other Benefits: Urban Sports Club subsidy, Kita placement assistance, subsidized office lunches.
• Sabbatical: 1-month sabbatical after 3 years of service (Break4me).
• Referral Bonus: Earn additional rewards by referring talented individuals.

Job Application Tip:

We recognize that candidates may feel they need to meet 100% of the job criteria to apply. This is only a guide; if you don't tick every box, it's okay to apply as you'll have room to learn and develop your career at SumUp.

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