Senior Engineer or Tech Lead at Fast-growing AI communication startup

You will architect the core real-time messaging infrastructure for an AI-native collaboration platform. By implementing CRDTs and scaling WebSocket systems, you will enable seamless interaction between humans and AI agents. This role combines hands-on engineering with technical leadership, defining the backbone of how modern teams communicate in an agentic world.

Fast-growing AI communication startup

• Design and implement the next generation of real-time sync engines using CRDTs and advanced WebSocket architectures.
• Serve as the senior technical anchor, making critical build vs. buy decisions and balancing speed with long-term scalability.
• Mentor a small team of engineers while remaining hands-on in the codebase to ship core infrastructure and product features.

• Proven experience building and scaling real-time messaging or multiplayer collaboration systems (e.g., sync engines, WebSockets, or CRDTs).
• Strong product sense and the ability to thrive in a fast-paced, 0-to-1 startup environment where requirements evolve quickly.
• Professional background at high-growth startups or companies known for world-class engineering in the collaboration and infrastructure space.

• Solve complex distributed systems problems like conflict-free state synchronization at the intersection of AI and real-time infrastructure.
• Join a high-caliber team led by a serial founder and Thiel Fellow, backed by top-tier venture capital firms.
• Benefit from significant equity ownership (0.5%+) in an early-stage company reimagining the multi-billion dollar workplace messaging market.