Senior Full-Stack TypeScript Engineer (Frontend-Leaning)
Summary
Build and refine AI-powered, real-time collaborative web and mobile applications using TypeScript, React, and React Native in a fast-paced startup environment.
Senior Full Stack Engineer (Frontend-Focused)
About the Role
We are looking for a Senior Full Stack Engineer with a strong frontend orientation to help build next-generation collaborative AI-powered product experiences. This role is ideal for someone who thrives in fast-paced startup environments and enjoys building polished, user-centric applications that blend creativity, AI, and real-time collaboration.
You will work closely with product, design, and engineering teams to create highly interactive web and mobile experiences where humans and AI agents collaborate seamlessly.
Responsibilities
- Build and maintain complex full stack applications using TypeScript across the entire stack
- Develop highly polished, responsive, and visually refined user interfaces
- Create real-time collaborative experiences and interactive canvas-based workflows
- Work on AI-powered product features, including LLM integrations and agentic workflows
- Collaborate closely with product and design teams to deliver intuitive user experiences
- Implement animations, transitions, and modern frontend interactions
- Contribute to backend architecture and scalable system design
- Participate in technical discussions and product decision-making
- Demonstrate ownership of features from concept through production deployment
Required Qualifications
- Strong experience with TypeScript across frontend and backend development
- Proven experience with React and modern web technologies
- Experience with React Native for mobile development
- Solid full stack engineering background with strong frontend expertise
- Strong understanding of UI/UX principles and product-minded engineering
- Experience building polished consumer or SaaS web products
- Ability to work in a fast-moving startup environment
- Excellent communication and collaboration skills
- Authorized to work in the United States
Preferred Qualifications
- Experience working with LLMs, AI workflows, or agentic systems
- Experience building collaborative or real-time applications
- Familiarity with animations, motion systems, and interactive interfaces
- Experience working on creative tools, design tools, or highly visual products
- Startup experience and comfort with ambiguity
- Strong product intuition and design sensibility
Work Environment
- Hybrid role based in New York
- Four days onsite, one day remote (Fridays)
- Fast-paced startup environment with lean decision-making and rapid iteration
Ideal Candidate
The ideal candidate is a highly capable engineer who combines strong technical execution with product thinking and design sensitivity. They are passionate about building cutting-edge AI-enabled experiences and enjoy working closely with small, high-impact teams.
Y Combinator