SECTION I · THE BRIEF
Brief #48468Updated 21 AUG 2026CHICAGO, IL, US / SAN FRANCISCO, CA, US / REMOTE (SAN FRANCISCO, CA, US; CHICAGO, IL, US)YcY COMBINATOR
Employbl Company Profile

Founding Engineer (Frontend)

Letter AI is the world's first generative AI powered revenue enablement platform. Build and maintain all the collateral and training you need 10x faster with generative AI. Personalize instantly by vertical or even…

Location
Chicago, IL, US / San Francisco, CA, US / Remote (San Francisco, CA, US; Chicago, IL, US)
Company size
5–20
Posted
Today
Via
Yc
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  • 01Comp band & equity packageLocked
  • 02Seniority & experience requirementsLocked
  • 03Interview process & rubricLocked
  • 04Hiring manager & team contextLocked
  • 05Growth trajectory in this roleLocked
  • 06Offer & decision timelineLocked

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Founding Engineer (Frontend) · Letter AI

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Job title
Founding Engineer (Frontend)
Job location
Chicago, IL, US / San Francisco, CA, US / Remote (San Francisco, CA, US; Chicago, IL, US)
Job description
We are now looking for a frontend focused Founding Engineer to join our team. As one of our first hires, you will play a pivotal role in shaping the company, our culture, and technology. You will fully own the frontend of Letter AI's web app and help us deliver a world-class user experience driven by the latest advances in generative AI. Your key responsibilities will include: 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 As a part of the team at this early stage, you will not only receive competitive salary and benefits, but also a significant equity stake in the company. We are seeking teammates who are resourceful, ambitious, solution-oriented, and humble. Join us on this exciting journey to build the world's next leading sales software company. We look forward to hearing from you!
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Letter AI headquarters

Chicago, IL

Company size

520 employees

Founded

2023

Total raised

$3,200,000

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Funding rounds

  • Series B$40M
  • Series A$10.6M
  • Seed$4M
  • Seed$2.7M
  • Pre Seed$500K