Project Introduction We are looking for an experienced Software Solution Designer to join our international team and contribute to the development and continuous improvement of a strategically important system within the Deutsche Telekom Group. The project supports the planning, construction, inventory, configuration, operation, and optimization of mobile radio networks. Its applications and services provide a consistent data foundation for internal systems and support collaboration with external partners across the mobile network lifecycle. WHAT WILL YOU DO: Translate business needs and customer requirements into effective, scalable IT solutions. Analyze and refine requirements, user stories, business processes, and functional specifications. Design end-to-end solutions for mobile radio network infrastructure across applications, services, APIs, and system interfaces. Decompose complex requirements into clear, development-ready solution components. Create and maintain solution designs, process models, interface specifications, and system documentation. Identify involved systems, interface partners, dependencies, and integration impacts. Define and assess relevant non-functional requirements, including performance, security, availability, and maintainability. Design and validate REST API interactions, data flows, and mappings. Analyze existing mobile radio network systems and identify opportunities for improvement and simplification. Evaluate solution alternatives and communicate recommendations to business and technical stakeholders. Collaborate closely with Product Owners, business analysts, developers, architects, DevOps teams, and system engineers. Support implementation, testing, rollout, and continuous improvement of the solution. Contribute to a clear, consistent, and maintainable system landscape. Document and communicate solution principles, guidelines, and design decisions.