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# Full Stack Engineer

- **Company:** Sumuppers
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Cloud Engineering, Software Quality, Distributed Systems, Next.js, Salesforce.Com, Data Streaming, TypeScript, Web Applications, ReactJS, Large Language Models, Kubernetes, Restful APIs, Microservices
- **Published:** September 5, 2026
- **Apply:** https://startup.jobs/senior-full-stack-engineer-sidekick-sumup-8269842

## About the Role

* 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.
 * Strong, proven experience with React and TypeScript, building scalable, maintainable applications in a production environment.
 * Experience building or consuming RESTful APIs and working within complex micro service systems, familiarity with Go is welcome.
 * 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 alongside our product 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.

## Description

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.

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 prioritisation 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


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