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Role description

Front End Engineer

Fifth Door logoFifth DoorYC F25
AI-native
TypeFull-time
WorkplaceRemote
SeniorityMid-level
SponsorshipSponsors visas
LocationSan Francisco, CA, US / Remote (US)
Engineering

About Us

Fifth Door unlocks the power of imagination by making it easy for anyone to create, share, and play turn-based games anywhere, with anyone. We exist to inspire connection, creativity, and community through the limitless joy of games.

Create. Play. Anywhere.

About the Role

We are seeking a Front-End Engineer who is passionate about delivering outstanding user experiences that delight our users. This is an opportunity to join a fast-moving, ambitious team where your work will have real impact from day one.

Responsibilities

  • Architect, develop, and maintain highly responsive and user-friendly web applications.
  • Collaborate with cross-functional teams to turn mockups and prototypes into elegant, functional code.
  • Ensure the technical feasibility of UI/UX designs.
  • Optimize applications for maximum speed and scalability.
  • Write clean, maintainable, and well-tested code.
  • Identify and troubleshoot front-end performance issues.
  • Stay current with front-end trends and emerging technologies, bringing ideas back to the team.

Qualifications

Must-Have:

  • 3+ years of experience as a front-end engineer or similar role.
  • Expert proficiency with React and Typescript.
  • Strong understanding of cross-browser compatibility, responsive design, and accessibility standards.
  • Familiarity with modern build pipelines and tools (Webpack, Vite, Rollup, etc.).
  • Experience integrating with RESTful APIs and WebSockets.
  • Git proficiency and experience working in an agile development environment.
  • Proficiency using AI tools in development workflows

Nice-to-Have:

  • Interest or experience in animations on the web.
  • Some familiarity with back-end technologies is a plus.
  • Passion for gaming, creative tools, or AI applications.

Benefits

  • Competitive salary and meaningful equity.
  • Health, dental, and vision coverage.
  • Flexible work hours and unlimited vacation policy.
  • A collaborative, supportive team environment.
  • Opportunity to shape product direction and culture early.

Relevant archetypes

Apply on Y Combinator
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Company info

Fifth Door logo

Fifth Door

Create and play games with AI

SeedYC F25
Size1–10 employees
IndustryTechnology, Information and Internet
Funding
  • Seed · $20M · Nov 26, 2025
Unlock human wisdom
ThesisTermsPrivacy
Investors
Garry Tan (Y Combinator)Aydin Senkut (Felicis Ventures)George Bousis (Protagonist Ventures)

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