✅ Further development and maintenance of the billing system for Telekom Deutschland's resellers✅ Replacement of the utilized billing software with an in-house solution✅ Agile software development within a Scrum team✅ Analysis and implementation of new requirements✅ Deployment to the company's private cloud using CI/CD pipelines✅ Integration with the enterprise-wide identity management through SAML 2.0✅ Implementation of the country-specific component of the new self-service app for end customers of Telekom Deutschland in an international environment (MeinMagenta 2.0)✅ Implementation of the Product Inventory Management microservice interface for integrating legacy systems with the backend-for-frontend✅ Agile software development within a Scrum team✅ Deployment to the AWS cloud using CI/CD pipelines✅ International project

✅ Securing the German mobile billing chain✅ Designing and aligning new meters/measurement points along the billing chain✅ Configuring new meters and equations✅ Release management✅ Ensuring compliance with SOX (Sarbanes-Oxley Act)

✅ Securing the German mobile billing chain✅ Designing and aligning new meters/measurement points along the billing chain✅ Configuring new meters and equations✅ Release management✅ Ensuring compliance with SOX (Sarbanes-Oxley Act)

✅ Bridgehead Corporate IT payment systems✅ Budget coordination✅ Planning and commissioning with corporate-level system project managers✅ Co-signing management templates for budget approvals✅ Subject matter project leadership for requirements exclusively concerning international systems✅ Member of the international community for knowledge sharing and early involvement in international solutions

✅ Ensuring security, data protection, and SOX compliance for the CRM system for mobile customers✅ Creation of data protection and authorization concepts✅ Implementation of measures from risk analyses and security assessments✅ Project management✅ Coordination between business and IT stakeholders✅ Selection and commissioning of external service providers✅ Bridgehead Corporate IT payment systems✅ Budget coordination✅ Planning and commissioning with corporate-level system project managers✅ Co-signing management templates for budget approvals✅ Subject matter project leadership for requirements exclusively concerning international systems✅ Member of the international community for knowledge sharing and early involvement in international solutions

✅ Further development and maintenance of the billing system for private and business customers of T-Mobile Germany✅ Requirements analysis and functional design using object-oriented methods (UML)✅ Maintenance of system documentation (German and English)✅ Functional design leadership✅ Accompanying the offshoring to an Indian service provider

✅ Served as a software architect in various customer projects✅ Industries: Public sector, travel agencies, military, automotive suppliers✅ Requirements analysis✅ Object-oriented analysis and design using UML✅ Creation of database models✅ Software architecture conceptualization✅ Development of web interfaces✅ Client-side and server-side Java development✅ Specification of unit, module, and integration tests✅ Training and coaching of client employees

✅ Engagement as an IT consultant in various customer projects✅ Industries: Public sector, banking, telecommunications✅ Requirements analysis✅ Object-oriented analysis and design using UML✅ Software architecture conceptualization✅ Implementation in Java✅ Training and coaching of client employees✅ Graphical user interface (GUI) development for mainframe applications

✅ Team leadership of 4 developers✅ Resource planning using MS Project✅ Creation of IT concepts✅ Requirements analysis✅ Implementation of GUI and application logic using Visual Basic✅ Customization and expansion of the data model using Oracle Designer✅ Module and integration testing.

✅ Development of client-server applications for an energy provider in a development team with client employees using C and C++✅ Maintenance of DB2 and Oracle development databases✅ Design and implementation of the GUI using ISA Dialog Manager✅ Execution of module and integration tests.