Senior Frontend Developer (+ Equity) at AI-native startup backed by YC and Spark Capital

We're seeking a Senior Frontend Developer to own the frontend of the core product, Sauna, for an AI-native startup. The role involves making product and design decisions, prototyping quickly, and executing without perfect specs. The company is a 12-14 person team backed by YC and Spark Capital, building a personal AI assistant.

• Own the frontend development of the core product
• Make product and design calls independently
• Prototype and execute designs quickly
• Ensure software feels polished with attention to detail
• Implement and create designs as needed

• 4+ years of frontend engineering experience
• Portfolio of complex web apps in production
• Deep fluency in React and state management
• Comfortable with full-stack development
• Strong performance instincts and product sense
• High autonomy and low ego
• US work authorization or O-1 visa eligibility
• Experience with multiplayer apps and LLM-based tools
• Background in local-first architectures
• Design background or strong visual sense
• Experience as a founding frontend engineer