Application Developer for Reselling Platform (m/f/d)

PURPOSE Develops new and maintain existing source code of applications in Java programming language based on requirements of internal or external customers. These applications support automation of business processes of the Reselling services like Netflix, Disney+, Apple TV etc,. Works independently or in project team on developing and building midsize and complex application for customer usage. Handles all phases of software development lifecycle by himself, especially for midsize applications, provides professional support in the field of deep system analysis, technical documentation, building related infrastructure for developed application by prototyping, research. Performs role of lead development architect, substitutes the role of project manager in case of small or midsize software projects, serves as professional mentor THE BUSINESS AND PROJECT DESCRIPTION The PSB Hub manages billing, collections, and accounting functions for partnering, business, wholesale, and accounting value streams. It handles B2B billing, verifies TDG invoices with partners, and serves business customers and wholesale clients. Comprised of 13 teams, the Hub works closely with business units to drive customer impact, focusing on cloudification, system modernization, and agile practices. The SK PSB Team is responsible for planning, product development, application operation, and DevOps of Reselling services. The Service Delivery Platform (SDP) application is the backbone for partner connectivity, handling identity management, online payments, subscription services, and more across all Deutsche Telekom European markets. SDP empowers partners like Netflix, Disney, Google, and Apple to integrate seamlessly, so Telekom customers can subscribe to services or make purchases directly via their Telekom bill. WHAT WILL YOU DO? Listen to user requests, consult with internal /external customers, assist in gathering requirements for preparation of application detailed feature specification as necessary basis of quality and functional application Analyze of customer’s requirements and propose application / framework design of midsize application architecture (incl. interfaces, relation database structure) in order to build application functionality easy for maintenance and future extension according to customer needs Provides project estimates, timeline like total number of development hours, total number of testing hours and bug fixing and report it to customer for budget planning in advance Implements customer’s requirements based on specification in selected object oriented programming language (JAVA, TypeScript) into functional and user friendly application to meet customer’s needs Provides testing of programmed functionality before deployment in order to avoid bugs and ensure quality of code Implements security concept according to PSA policy in developed application to ensure accordance with DTAG standards Write and update regularly more complex technical / system documentation (e.g. Authorization concept) for success of penetration tests and also for official handover to operation process Communicate project status and deliverables to managers, customer with efficiency and accuracy of any progress or delays to keep them informed and let them be ready for managerial decision and project’s adjustment in advance Maintain application on 2nd, 3rd level support by fixing bugs and regular check, programming updates of features on customer’s change request to satisfy customer needs and to ensure smooth running of the application with added value Record spent time daily in transparent way to have basis for invoicing for customer and Controlling department purpose Perform deploy on infrastructure, backup and restore procedures, handle release management in order to provide regular upgrades of software to have up to date features implemented according to agreement with customer Other duties and responsibilities as assigned by higher management. Manages partial project tasks assigned to him, timelines and communication Mentor of junior developers Provides technical trainings for basic users, junior developers (e.g. SharePoint sites administrators workshops) if required YOU WILL SUCCEED IF YOU: have education of Information technologies – Bachelor´s degree have experiences with ICT System - 2+ years have experiences with programming – Intermediate have experiences with HW/SW Overview – Advanced have experiences with General IT Overview – Advanced are communicative, team player and have analytical thinking speak English – Upper intermediate (B2) have experiences with programming – Advanced skills with Java 21, SpringBoot have advanced knowledge of software development methodology (e.g. Agile, Waterfall), Rabbit MQ, MySQL, OpenSearch, Docker, Kubernetes, Angular, Cucumber, Git, Maven have advanced skills with monitoring tools like Graylog and Grafana and proven skills with SSH, SSL/TLS, WSDL, Oauth2, OpenAPI, REST experienced in UML and overview ab…