Senior Full-stack Developer with focus on Frontend (Senior Application Developer - Project Gigabit) (m/f/d)

About the role

Develops new and maintain existing source code of applications in programming language like Java, ASP.Net or C# based on requirements of internal or external customers. These applications support usually automation of business processes. Project Gigabit: Be part of something big - help us build the Gigabit Business Framework , an innovative platform that brings ultra-fast gigabit connectivity to customers across Europe. We're revolutionizing how we deliver internet services - by introducing smart technologies even before fibre is physically deployed. This customer-first approach allows us to roll out infrastructure based on demand, enable instant service activation in connected homes, and support dynamic pre-sales activities - all supported by modern automation and cloud-based solutions. You'll work in an agile, international team where your ideas make a real impact. We release directly into production, continuously improve based on real feedback, and collaborate closely across teams to create robust, scalable, and future-ready solutions. Join us and help shape the digital future - with cutting-edge tools, a supportive environment, and a product that truly matters. Our mission: As a dynamic, flat and international organization, we shape the future of Deutsche Telekom IT in integrated teams consisting of all relevant competencies - it goes without saying that Telekom customers are also part of these teams. Our Focus: Architectural Evolution: We're dedicated to transitioning from monolithic systems to a decoupled API architecture, improving efficiency, reliability, and enabling scalability. Cloud Transition: Our work involves utilizing top-tier cloud solutions including AWS, Azure, and Google Cloud, as well as our private cloud for sensitive data. We're in the process of migrating from on-premise setups to a more robust, scalable cloud infrastructure. Cutting-Edge Technology: We stay on the forefront of the tech industry by actively employing modern technologies, fostering an environment that encourages learning and professional growth. Agile Collaboration: We believe in the power of teamwork and adaptability. By implementing the Scrum methodology and SAFe in our biggest projects, we ensure dynamic collaboration and efficient workflow across all levels of our organization. Innovation & Value Creation: Our teams are constantly pushing the boundaries, redesigning current solutions to fit contemporary standards, and embarking on greenfield projects with high business potential. Through strategic prototyping, we continuously unearth fresh ideas and cultivate a culture of constant innovation. WHAT WILL YOU DO? Develop new and maintain existing source code of applications Works in SCRUM team on developing and building complex application solutions for customer DTAG Serve as professional mentor for junior and medior developers Listen to user requests, consult with internal /external customers, project managers, Analyze of customer's requirements and propose overall application / framework design of midsize application architecture (incl. interfaces, relation database structure), provide complex business analysis to build application functionality Provide 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 Implement customer's requirements based on specification in selected object-oriented programming language into functional and user-friendly application Provide testing of programmed functionality before deployment to avoid bugs and ensure quality of code Implement security concept according to PSA policy in developed application to ensure accordance with DTAG standards Mentoring Take part on internal evaluation processes Product responsibility from technology point of view. Negation with PO/PM about technology stacks used in project. Tech Stacks We are searching for candidates mainly with React and Angular systematic skills, and Java, Spring Boot and Quarkus knowledge. Additional preferred knowledge/experience (as an advantage): any testing tool/framework, Kubernetes, Docker, Microservices, Git, cloud technologies (AWS, Azure, Google), DB, Grafana. YOU WILL SUCCEED IF YOU : Have React and Angular systematic skills Have some experience within the field of application programming in object-oriented programming languages, experience with agile software development methodology (e.g., Scrum) Are advanced at Programming, HW/SW Overview, General IT Overview Have good soft skills like Communication, Analytical thinking, Team Cooperation Speak English at least on B2 level and German language is advantage Create and validate the business requirements on different levels (Epics, User Stories). Clear focus on customer requirements, business value creation and securing that the backlog is understood and development ready from developer´s perspective. Describe processes and dataflows in Epics and User Storie

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