Lead Java Developer (APIs and Observability) | Lead Developer mit Fokus Java, APIs und Observability (w/m/d)

Deutsche Glasfaser Holding GmbH

Saarlouis, Saarland, Deutschland
Published Feb 25, 2026
Full-time
Permanent

Job Summary

As a Lead Developer, you will spearhead the design, development, and operation of high-performance Java-based backend services and APIs. This role is central to creating scalable and future-proof systems that serve as the foundation for digital products. Your daily responsibilities include ensuring code quality through rigorous testing and observability practices, managing CI/CD pipelines via GitHub Actions, and implementing modern architectural patterns such as event-driven designs. You will play a pivotal role in cloud-native architecture decisions, focusing on resilience and maintainability. Beyond technical execution, you will act as a mentor within an agile team, fostering knowledge exchange and professional growth for less experienced colleagues. This position is particularly attractive for those seeking a 'Cloud-native' environment with a high degree of autonomy, offering modern benefits like flexible home office setups, a dedicated training academy, and a comprehensive suite of social benefits including pension and childcare subsidies.

Required Skills

Education

Degree in (Business) Computer Science, Information Technology, or a comparable qualification; alternatively, a technical vocational training with several years of relevant professional experience.

Experience

  • Several years of professional experience in backend development and building complex system landscapes
  • Extensive expertise in Java development using modern frameworks like Spring Boot or Quarkus
  • Proven experience with relational and multimodal databases including data modeling and performance tuning
  • Demonstrated experience in implementing CI/CD processes, test strategies, and observability concepts
  • Professional background in designing synchronous and asynchronous API architectures
  • Practical experience with container technologies, Kubernetes, and cloud messaging services

Languages

German (Fluent)English (Fluent)

Additional

  • Contractual job title will be 'Application Owner'. Location constraints involve regional digital supply operations. Requires ability to work independently within an agile team structure.