Your Task

This role involves developing new and maintaining existing applications using modern technologies (primarily Java) based on requirements of internal or external customers. You will work independently or as part of a project team on designing, developing, and building mid-size to complex, scalable applications in a cloud-native, microservices-based environment. As part of this position, you will actively contribute to the migration of business logic from a legacy billing system (one of the top 100 most critical Telekom applications) into a modern streaming platform built on Quarkus and Kafka, designed to process millions of events daily.

Responsibilities

Collaborate with stakeholders (business, product, architects) to understand requirements and translate them into scalable technical solutions
Design and develop backend applications and microservices in a cloud-native environment
Contribute to the migration of business logic from a legacy billing system into a modern event-driven architecture (Quarkus + Kafka)
Design and implement REST APIs and event-driven communication between services
Analyze requirements and propose robust, maintainable architecture solutions with focus on scalability and performance
Estimate development effort, plan implementation, and support delivery planning
Develop high-quality, clean, and testable code using Java (preferably Java 17)
Ensure code quality through testing, reviews, and best practices
Participate in CI/CD pipelines, deployments, and release management
Support application operation (L2/L3), including troubleshooting, bug fixing, and performance optimization
Create and maintain technical documentation (architecture, APIs, flows)
Ensure security and compliance with internal standards
Proactively identify risks, perform root cause analysis, and drive improvements
Act as a senior team member, contributing to architecture decisions and mentoring junior developers
Share knowledge within the team and contribute to continuous improvement of development practices