Backend Engineer (m/f/d)

Role overview Build and evolve the backend foundation for speech-to-speech AI products used through APIs and integrations. You’ll own core services and infrastructure, balancing performance and scale with reliability, maintainability, and a smooth developer experience.

Responsibilities - Design and implement backend features and expand the core API. - Scale services to support high volumes of users and concurrent calls. - Improve resilience through robust error handling and idempotent operations. - Diagnose production incidents and address their underlying causes. - Build engineering tools such as integration test frameworks and feature rollout pipelines. - Improve logging, debugging, and tracing to speed up incident response.

Requirements - Professional experience with Kotlin, Spring Boot, and Java. - Strong PostgreSQL skills and experience building and maintaining data-backed systems. - Ability to take ownership of architecture and deliver production-ready backend systems. - Fluency in German.

Nice to have - Experience in a fast-moving startup or deep-tech environment. - Background in incident response, compliance engineering, or high-security systems.

Benefits and work setup Work remotely, with an office available in Berlin. The team supports asynchronous work, flexible hours, and autonomy over how work is organized, coordinated with team needs.