• You will work on: SIP/VoIP signaling • RTP media flows • Distributed backend systems • Event-driven architectures • Low-level, performance-sensitive network components • AI-augmented engineering workflows • You will contribute across the entire stack, from protocol handling to API-driven orchestration. • You will be responsible for: • Architecture: clean interfaces between protocol, media and API layers • Reliability & operability: instrumentation, debugging, incident management, hardening • Performance: latency, throughput, resource usage, media-path efficiency

• Own backend robustness: Improve and maintain core backend components with a focus on correctness, performance, and long-term maintainability • Solve complex business logic: Identify and fix edge cases caused by heterogeneous customer data and evolving requirements • Improve database performance: Analyze and optimize slow queries, data access patterns, and schema decisions as data volume increases • Build pragmatic solutions: Extend existing systems carefully, choosing simplicity over premature optimization & abstraction • Collaborate on operations where it matters: Contribute to infrastructure, CI/CD, observability, and deployment improvements that directly impact backend stability and scalability • Work closely with the team: Collaborate with other engineers and product to turn real operational needs into reliable backend behavior

• Work across the full stack (NestJS/React) to develop new features, maintain the existing codebase, and ensure high availability. • Manage AWS services, IAM (Cognito), improve CI/CD pipelines (GitHub Actions), and oversee IaC provisioning using CloudFormation/CDK. • Research solutions, create PoCs, and keep our technology currency and security posture up to date. • Provide L3/L4 technical support and promptly address production issues to maintain service quality. • Communicate frequently with business stakeholders to translate requirements into high-quality deliverables.

• Arbeiten in office in München, Stuttgart oder Mannheim oder von zuhause aus • Zusammenarbeit in Projektteams an der Digitalisierung wichtiger Bereiche • Verantwortung für sauberen, strukturierten, lesbaren und dokumentierten Code • Arbeiten nach Best Practices und neuesten Methoden der Softwareentwicklung • Unterstützung von Teamkollegen um gemeinsam zu wachsen und sich weiterzuentwickeln