Job Title: Founding Software Engineer

📍Location: 🏙️ Berlin or Hamburg

🔗 Website | Linkedin

🌟 Our Mission

At coobi, we’re on a mission to transform addiction care: Making it more accessible, more personalized, and ultimately more effective. Our platform uses digital biomarkers like heart rate variability, sleep, and stress to detect high-risk moments during recovery. With the help of machine learning, we empower therapists to intervene early and support patients exactly when they need it most.

We're not building just another health app: We’re creating a digital support system that has the potential to reduce relapse rates, lighten the burden on the healthcare system, and improve the long-term health of millions.

Join us at this early stage and help shape a product that will have measurable, lasting impact on individuals, on families, and on the future of mental health care.

💼 What you’ll do at coobi:

• Design and maintain robust backend systems
• Define and optimize database schemas (Postgres or similar) to support real-time biomarker data and user interactions
• Build data pipelines for wearables and health apps, ensuring smooth ingestion and aggregation
• Improve the performance and reliability of our live product, including complex GraphQL queries and backend troubleshooting
• Collaborate closely with frontend and product teams to implement API interfaces that improve security, reliability and efficiency.

🤹 We'd love to hear from you if you have:

• A strong product mindset, a love for solving complex problems, and a willingness to take full ownership across the stack
• Experience building and scaling backend systems with Node.js, TypeScript and Postgraphile
• Deep understanding of GraphQL APIs and schema design
• Experience working with real-time biometric data through wearable APIs and SDKs
• Proficiency in structuring and querying relational databases (Postgres a plus)