Senior Developer - REF5617V

As Hungary’s most attractive employer in 2025 (according to Randstad’s representative survey), Deutsche Telekom IT Solutions is a subsidiary of the Deutsche Telekom Group. The company provides a wide portfolio of IT and telecommunications services with more than 5300 employees. We have hundreds of large customers, corporations in Germany and in other European countries. DT-ITS recieved the Best in Educational Cooperation award from HIPA in 2019, acknowledged as the the Most Ethical Multinational Company in 2019. The company continuously develops its four sites in Budapest, Debrecen, Pécs and Szeged and is looking for skilled IT professionals to join its team. The project focuses on implementing and improving business objects for mobile network infrastructure in backend systems up to the API layer. It provides a consistent and scalable data foundation for internal systems, while external partners remain relevant in the overall ecosystem. The work takes place in a modern, agile, and dynamic environment that fosters innovation and a clear system landscape. The team develops and maintains business objects, including data models, backend logic, and APIs. Collaboration is primarily with internal stakeholders, while considering requirements related to external partners. Activities include implementing features, refining components, testing, and maintaining documentation within a modern, agile, and engaging working environment. The senior developer contributes with strong expertise in Python, including frameworks commonly used for building robust JSON-based API services. They ensure high code quality, maintainability, and performance by applying best practices in backend development and API design. Required Qualifications: Extensive experience in Agile development methodologies Advanced proficiency in Python and modern backend frameworks Strong experience in API design, integration, and development Solid background in SQL development and database design Demonstrated expertise in back-end development and system architecture Proven experience building and maintaining API services Strong understanding of code quality, maintainability, and best practices in backend development Language: English (B2) Preferred Qualifications: Experience with performance optimization and scalability in backend systems Familiarity with business object modelling and data model design Experience in testing frameworks and quality assurance methodologies Proficiency with version control systems and CI/CD pipelines Experience working with internal stakeholder management and cross-functional collaboration Demonstrated ability to mentor junior developers and contribute to team growth Knowledge of mobile network infrastructure or telecommunications domain * Please be informed that our remote working possibility is only available within Hungary due to European taxation regulation.