This range is provided by Thyme. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.Base pay range$150,000.00/yr - $200,000.00/yrDirect message the job poster from ThymeFounding Front End Engineer | Stealth AI Creator StartupAbout the CompanyA breakout consumer AI startup is looking for a Founding Front End Engineer to join at a pivotal moment — just after hitting $1M ARR in under 4 months and on track to 10x that within the year.They’re building AI tools that supercharge individual creators — helping them produce standout social content at scale.The product sits at the intersection of AI, video, and real-time collaboration. Early traction has been explosive, and they’re backed by top-tier angels with ongoing conversations with tier-1 VCs.This is an opportunity to own the technical vision, assist in building out the team, and help define a product that could touch millions!What You’ll DoTake ownership of foundational frontend architecture as a founding engineer, making decisions that shape the company’s core product and design systemDesign and implement complex animation systems using finite state machinesManage intricate UI state transitions across multi-step AI-driven workflowsBuild scalable, performant UIs that handle real-time AI streaming, complex data, and progressive loading statesMaintain high standards for accessibility, quality, and resilience while scaling to thousands of usersYour Skills – Must-Have6+ years of production experience building complex, user-facing applicationsState management mastery: expert with FSMs (e.g., XState, Zustand) and complex UI transitionsAnimation architecture: deep understanding of FLIP technique, hardware acceleration, and custom choreographyTypeScript expertise: advanced patterns, generics, conditional types, type-safe API designPerformance engineering: Core Web Vitals, memory profiling, virtual scrolling, render performance tuningAccessibility at scale: WCAG 2.1 AA, screen readers, keyboard navigation for complex flowsTesting excellence: strong experience with visual regression, accessibility, and performance testingYour Skills – Nice-to-HaveExperience in GPU-based rendering or familiarity with infra considerations for AI-driven UIsBuilding scalable component libraries, design systems, and compound componentsAdvanced animation via Framer Motion, React Spring, or custom enginesComplex data visualization: D3.js, Canvas/WebGLAdvanced build tooling: Webpack, Vite, code splitting strategiesInterfaces for ML/AI systems, especially handling non-deterministic or streaming UXFamiliarity with AI/ML concepts and how to surface them in an intuitive UIThe StackFrontend: TypeScript, React, Next.js, Tailwind CSS, Framer Motion, XStateTesting: Jest, Testing Library, Playwright, ChromaticAI Integration: Streaming APIs, WebSocket-based real-time collaborationInfrastructure: Docker, CDN optimization, edge computing, GPU-accelerated rendering conceptsA complex animation system you’ve architected from scratchA performance optimization that improved Core Web Vitals by 20%+Examples of accessible, interactive, complex UIs you’ve built(Optional) Open source contributions or technical writing that demonstrates expertiseTechnical Challenges You Should Thrive OnBuilding a real-time collaborative interface with 60fps animationsImplementing robust state machines for multi-step AI workflowsOptimizing render performance for data-heavy dashboardsArchitecting reusable component libraries for multi-product scalingWhy This Role:Join a rocket ship just before liftoff — massive trajectory already underwayCompetitive salary + meaningful equityDirect impact on product, culture, and trajectoryWork with a highly capable, fast-moving team that actually shipsSeniority levelSeniority levelMid-Senior levelEmployment typeEmployment typeFull-timeJob functionJob functionInformation TechnologyIndustriesSoftware Development and Technology, Information and MediaReferrals increase your chances of interviewing at Thyme by 2xSign in to set job alerts for “Software Engineer” roles.San Francisco, CA $160,000.00-$180,000.00 2 weeks agoFull-Stack Software Engineer (Jr/Mid level)San Francisco, CA $120,000.00-$180,000.00 1 month agoSan Francisco, CA $150,000.00-$230,000.00 3 months agoSoftware Development Engineer I - Frontend & MobileSan Francisco, CA $150,000.00-$176,000.00 3 months agoSan Francisco, CA $120,000.00-$190,000.00 9 months agoSan Francisco, CA $150,000.00-$180,000.00 2 days agoSan Francisco, CA $125,000.00-$175,000.00 1 month agoSoftware Engineer, Frontend (All Levels)San Francisco, CA $150,000.00-$220,000.00 6 days agoWalnut Creek, CA $115,000.00-$135,000.00 6 days agoSan Francisco, CA $165,000.00-$165,000.00 2 years agoAlameda, CA $130,000.00-$160,000.00 1 month agoSan Francisco, CA $140,000.00-$280,000.00 8 months agoSan Francisco, CA $120,000.00-$200,000.00 2 years agoSan Francisco, CA $150,000.00-$300,000.00 1 month agoSan Francisco, CA $150,000.00-$250,000.00 10 months agoWe’re unlocking community knowledge in a new way. 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