Fullstack Developer (m/f/d)
Schwarz Group2 days ago
Barcelona, SpainMid Level / Senior
Responsibilities
- Own end-to-end feature development across business logic, backend endpoints, and responsive mobile user interfaces.
- Build and evolve React Native screens and user flows with TypeScript for iOS and Android.
- Design, build, and maintain backend services and APIs in C# and .NET.
- Write and maintain unit, integration, and E2E tests across frontend and backend layers.
- Collaborate directly with a Product Designer and Product Data Analyst.
- Break down complex epics into functional vertical slices supported by feature flags.
- Participate in frontend and backend code reviews and provide constructive technical feedback.
Requirements
- At least 3–4 years of experience designing, developing, and maintaining production-grade mobile applications for iOS and Android.
- Hands-on experience designing, building, and integrating APIs and backend services, preferably with C# and .NET.
- Practical experience with unit and integration testing frameworks such as Jest, xUnit, or NUnit.
- Ability to balance clean, extensible architecture with pragmatic, iterative delivery.
- Ability to communicate technical decisions, defend estimations, and participate in technical discussions.
- Preferred experience with event-driven architectures and NATS, Kafka, or RabbitMQ.
- Preferred experience with Docker, Kubernetes, or cloud deployment environments.
- Preferred knowledge of Infrastructure as Code technologies and shared design systems or component libraries.
- Preferred familiarity with Azure DevOps, GitHub Actions, or Fastlane.
- Preferred understanding of observability, tracing, and metric visualization with Prometheus or Grafana.
- Preferred familiarity with Xcode, Android Studio, native bridges, NitroModules, and native integration.
Tech Stack
Apache KafkaC#DockerGitHub ActionsGrafanaiOSJestKubernetes.NETNUnitPrometheusRabbitMQReact NativeTypeScript
Categories
Full StackMobile
About Schwarz Group
Schwarz Group is a German retail group that owns and operates the Lidl and Kaufland grocery chains, plus production and waste-management businesses (Schwarz Produktion and PreZero). Through its digital arm Schwarz Digits it builds and runs IT, cloud, data, and security services for its brands and external clients, and offers retail media solutions via Schwarz Media. Headquartered in Neckarsulm, it is privately held and active across Europe and beyond.