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Founding Engineer (Frontend)

Letter AI· Engineering, Frontend
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Hybrid (Chicago, IL; San Francisco, CA)$100k - $150k + equityFull-timePosted 11mo ago

About the role

Founding frontend-focused engineer to own Letter AI's web app frontend, shaping product and culture in an early-stage team. Build high-performance, AI-driven UI using React/Redux, implement UI with Material UI, ensure quality and scalability in AWS, and collaborate with backend to drive architecture and user experience.

Responsibilities

  • Develop high-performance, responsive frontend interface using React and Redux
  • Implement engaging and delightful UI experiences using Material UI
  • Take full ownership of the frontend code, ensuring its quality, scalability, reliability and maintainability in an AWS environment
  • Collaborate closely with the backend team to ensure smooth integration and contribute to architectural decisions
  • Understand customers needs and use that knowledge to improve the user experience

Qualifications

  • 3+ years of experience in frontend development
  • Proven experience working with TypeScript/JavaScript, React, Redux, and Material UI
  • Integrating with backend APIs, using techniques like caching to improve performance
  • Knowledge of automated UI testing frameworks
  • Past experience or strong interest in generative AI
  • Highly collaborative mindset with strong communication and problem-solving skills

Skills

Required:TypeScript/JavaScriptReactReduxMaterial UI
Nice to have:Frontend testing

Benefits

  • Competitive salary and benefits
  • Significant equity stake in the company
Last updated Aug 26, 2026. Interested? Apply on the company site.
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About Letter AI

Empowering B2B sellers with AI-powered training, coaching, and content

Letter AI is the world's first generative AI powered revenue acceleration platform. Build and maintain all the collateral and training you need 10x faster with generative AI. Personalize instantly by vertical or individual customers using existing data. Ask questions in real-time to your own co-pilot with expertise in your data. Scale coaching with realistic and hyper-personalized AI roleplay. Reach out to learn more about how both large enterprise like Lenovo and Adobe and growing startups like Paro and DealerBuilt are delivering real value for their revenue teams using the Letter AI platform.