Fullstack Developer (m/f/d)

October 21, 2026

Office

Middle

Barcelona, Spain

Indeed

Keep in mind

Office-only work

Description

Schwarz Digits is the IT and digital division of the Schwarz Group. It builds and operates IT infrastructure for Lidl, Kaufland, Schwarz Produktion and PreZero, and also serves external clients across Europe. This fullstack role is part of a product team focused on mobile applications, using React Native with TypeScript on the client side and .NET (C#) services and RESTful APIs on the backend. Developers deliver features end to end in small vertical slices behind feature flags and own code quality through reviews and automated tests across both layers. The position is based at the Barcelona office at Calle Bergara 13 and is aimed at experienced professionals.

Gender markers in the title: (m/f/d)

In accordance with European anti-discrimination legislation, this job is open to all candidates

Mmale

Ffemale

Ddiverse

Responsibilities

Own features end to end, from business logic and backend endpoints to responsive mobile interfaces
Develop and evolve screens and user journeys in React Native with TypeScript, ensuring clean architecture and stable performance
Design, build and maintain RESTful APIs and decoupled services on .NET (C#)
Write and maintain unit, integration and E2E tests to ensure stable production releases
Work directly with a product designer and data analyst, without intermediary managers
Break down large epics into small, workable slices behind feature flags and maintain a predictable delivery pace
Participate in frontend and backend code reviews, providing constructive, well-reasoned feedback

Requirements

At least 3–4 years of experience designing and developing production applications for iOS and Android
Strong proficiency in React Native and TypeScript
Hands-on experience developing backend services and RESTful APIs; C# / .NET experience is preferred
Experience designing, building and integrating decoupled services with reliable contracts
Hands-on experience with unit and integration testing (Jest, xUnit/NUnit)
Pragmatic engineering approach, balancing extensible architecture with rapid value delivery (KISS / YAGNI)
Ability to support technical decisions with data and defend estimates in technical discussions