Senior Product Engineer

About the role

As a Senior Product Engineer, you will own products and features end-to-end. You will be the bridge between technical implementation, product design, and user experience, working directly on Ojin to build everything from high-end interactive frontends to complex backend agentic systems.

What you'll do

• Drive features and projects from abstract concepts to production deployment, taking ownership across UI/UX design, product logic, and technical implementation.
• Architect and build core web infrastructure using TypeScript, React, and Node.js, ensuring user-facing applications are responsive, intuitive, and robust.
• Develop and maintain Python backends for AI capabilities, including proxy services, agentic systems, and conversational AI flows.
• Design scalable backend systems, considering trade-offs around performance and scalability, and drive architectural decisions that balance speed of delivery with long-term reliability.
• Collaborate closely with founders, designers, and other engineers to shape the product roadmap and technical strategy.

What you'll need

• 8+ years of professional software development experience.
• Startup experience — you have navigated the ambiguity of early-stage companies and know how to move fast without breaking things.
• Strong hands-on skills in Frontend (React, TypeScript) and Backend (Node.js, TypeScript), and comfortable owning features across the entire stack independently.
• Proficiency in Python and experience or strong ambition to build backend systems for AI agents and conversational interfaces.
• Enthusiasm about UI/UX, product design, and making trade-offs that benefit the customer.
• Professional fluency in English, both spoken and written.

Nice to have

• Experience with WebRTC and WebSockets for real-time applications.
• Experience with performance optimization for global, low-latency systems.
• Experience with Infrastructure-as-Code (IaC, AWS CDK) and AWS.
• Background in building developer tools, API platforms, or AI-enabled products.

What they offer

• High degree of autonomy and direct impact on product direction.
• Remote-first culture with Berlin HQ; work from anywhere within CET +/- 2 hours.
• 28 days of paid vacation plus 1 mental health day per year.
• Annual education budget of €900 for professional development.
• Home office equipment provided.