Senior Backend Engineer

About the Role Join the engineering team of a Series A B2B SaaS company building an AI-powered omnichannel customer communication platform for SMEs. You'll work on core backend technologies that power messaging, automation, and AI-driven workflows — shipping features end-to-end in a high-ownership environment and contributing to long-term architecture decisions. What You'll Do Build and deliver new backend features that reach customers directly. Improve platform performance and reliability to enhance the user experience at scale. Participate in long-term architecture discussions and help define technical direction. Shape internal development processes and establish best practices across the engineering team. Bring your own ideas to influence product and platform decisions. What We're Looking For Required: Proficiency in Java and TypeScript — both are essential for this role. Required: Experience with Quarkus or Spring Boot (or comparable JVM frameworks). Required: Hands-on experience with AWS and Terraform for cloud infrastructure. Strong PostgreSQL experience. Familiarity with AI libraries such as LangGraph . Background building scalable backend systems for communications or messaging platforms. Strong computer science fundamentals and a track record delivering features end-to-end at senior level. Tech Stack Backend: Java, Kotlin, Quarkus, Spring Boot, TypeScript Cloud & Infra: AWS (RDS/PostgreSQL, S3, SQS, SNS, SES, Lambda, CloudFront), Terraform AI/Search: LangGraph, OpenSearch Observability & tooling: DataDog, Sentry, GitHub Actions, LaunchDarkly Location & Work Arrangement This is a hybrid role based in Berlin, Germany . Visa sponsorship is available for qualified candidates.