Our client is a leading European technology organization focused on cloud computing, cybersecurity, and artificial intelligence. With a strong commitment to digital sovereignty and data protection, the company develops and operates a proprietary cloud platform that serves both internal business units and external customers. Its cloud ecosystem enables secure, scalable, and GDPR-compliant digital services for enterprises across Europe. Freelance cooperation Start date: ASAP/01.07.2026 Duration: until 31.10.2026, with the possibility of extension for an additional 6-12 months Requirements: Production experience developing backend services and infrastructure APIs in Go. Experience designing and operating REST and gRPC APIs in cloud-native distributed systems. Solid Kubernetes experience: workload deployment with Docker and Helm. Working knowledge of PostgreSQL and/or MariaDB, including schema design and query optimisation. Understanding of cloud infrastructure and IaaS concepts. OpenStack experience is a plus. Hands-on experience with CI/CD pipelines in a DevOps environment. Good command of English. German is a plus. Nice to have: Experienced in using AI tools in day-to-day workflow Main responsibilities: Design and develop infrastructure APIs in Go for cloud resource management. Implement REST and gRPC endpoints across the cloud platform API surface. Contribute to backend service architecture: API design, data models, service communication. Integrate services with the platform ecosystem: IAM, Terraform provider, OpenStack, Kubernetes. Maintain and improve CI/CD pipelines and release automation. Own services end-to-end: from development through production monitoring and incident response.