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We are looking for tech all-rounders who can master complex architectures and are motivated to participate in various fields. You understand how data needs to flow to perform perfectly across all platforms. As part of our crew, you use AI not just as a tool but as a turbo to blur the boundaries between disciplines and build pioneering software solutions.Development of new APIs with Spring & Kotlin and design of database solutions with MongoDB\nOrchestration of AI agents for automation of code generation and refactoring\nIntegration of LLM interfaces into scalable backend services\nArchitecture, unit testing, and clear documentation in Swagger\nContinuous optimization of the developer experience through AI workflows\nClose collaboration with the crew in the implementation of web or mobile features\nSparring with design and PM for technically sound and cross-platform solutions\nEnsuring seamless performance across all platforms\nIn-depth knowledge of Kotlin, the Spring Framework, and MongoDB\nDeep understanding of common patterns, API standards, and modern architectures\nConfident use of AI coding tools such as Claude Code\nAmbition to think beyond the backend and assume technical ownership\nAbility to critically validate AI-generated architectures and logic\nCommunicative, team-oriented, and open to new tech stacks\nFluent in German or English\nKnow-how in web technologies (React/Next.js) or mobile (Swift/Kotlin Multiplatform)\nExperience in integrating LLM interfaces into backend services\nExperience with Docker and GitLab CI/CD pipelines\nExperience with cloud infrastructure (AWS, DigitalOcean)\nProficient handling of API tools like Bruno or Postman\nYour salary depends on your qualifications and experience. Based on your seniority, we offer a significant overpayment above the collective agreement minimum salary. Legal notice: The IT collective agreement (ST1) applies to this position. 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