Fullstack Developer (m/f/d)

Schwarz Digits creates the technological foundation for digital sovereignty in Europe. As the IT and digital division of the Schwarz Group, we develop and manage the IT infrastructures for the retail divisions Lidl and Kaufland, as well as Schwarz Production and PreZero. At the same time, we operate as an independent provider in the external market to support companies across Europe in their digital transformation. We bundle our core services in the areas of Cloud, Cyber Security, Data & AI, Communication, and Workspace.

Join us and contribute to digital sovereignty in Europe. With us, you will work at the intersection of agility and security: You will benefit from fast decision-making processes, enjoy genuine creative freedom in your projects, and be able to build upon the stable foundation of the Schwarz Group.

Your Tasks

• End-to-End Feature Development: Own and deliver features from business logic and backend endpoints to responsive mobile user interfaces.
• Mobile Architecture & Development: Build and evolve screens and user flows in React Native using TypeScript, ensuring clean architecture, and solid performance across devices.
• API & Service Design: Design and build, and maintain RESTful APIs and decoupled services in .NET (C#), establishing reliable integration contracts and robust throughput.
• Shift-Left Culture & Quality: Own code quality across both layers. Write and maintain unit, integration, and E2E tests, ensuring software reaches production with maximum stability and confidence.
• Direct Collaboration with Discovery: Partner directly with our Product Designer and Product Data Analyst without relying on managers as bridges.
• Continuous Delivery & Vertical Slicing: Break down complex epics into small, functional slices supported by feature flags, maintaining a steady, predictable delivery pace across parallel products.
• Constructive Conflict & Code Reviews: Actively participate in code reviews across frontend and backend, providing constructive, rigorous, and empathetic technical feedback.

Your Profile

• Solid Experience with React Native & TypeScript: At least 3 - 4 years designing, developing, and maintaining production-grade mobile applications for iOS and Android.
• Backend & API Development Expertise: Proven hands-on experience designing, building, and integrating RESTful APIs and backend services, preferably in C# / .NET.
• Automated Testing Across the Stack: Practical experience with unit and integration testing frameworks (Jest, xUnit/NUnit).
• Technical Pragmatism (KISS / YAGNI): Balanced judgment between clean, extensible architecture and delivering fast, iterative business value without over-engineering.
• Assertive Technical Communication: Ability to articulate technical decisions with data, defend estimations constructively, and participate comfortably in technical debates
• Nice-to-Have:
• Experience with event-driven architectures and message brokers (NATS, Kafka, or RabbitMQ).
• Experience with Docker, Kubernetes, or cloud deployment environments.
• Knowledge of Infrastructure as Code (IaC) technologies.
• Hands-on experience working with shared design systems and component libraries.
• Familiarity with CI/CD pipelines (Azure DevOps, GitHub Actions, Fastlane).
• Understanding of observability, tracing, and metric visualization (Prometheus, Grafana).
• Practical familiarity with Xcode and Android Studio, a clear understanding of the native bridge / NitroModules, and native integration.

We look forward to receiving your application.

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Stiftsbergstraße 1 · 74172 Neckarsulm, Germany