Senior Frontend Engineer - Consumer Experience

• A locked frontend stack. React 19 Next.js 16 Tailwind v4 shadcn/ui. Non-negotiable. If you have strong opinions about this stack great - it's already decided and you'll build within it.
• Three consumer surfaces with different interaction paradigms. A content-rich website. A streaming conversational AI. A browser extension that activates at checkout. Each has different rendering state management and performance constraints.
• AI-generated UI components. Parts of the interface are generated or adapted by AI at runtime. You'll work with probabilistic GUIs - components that render differently based on confidence levels context and user state.
• A design system that doesn't fully exist yet. The Founding Designer will define it. You'll build and extend it. Design-engineering collaboration is tight - no handoff no Jira tickets no waiting for specs.

• Consumer surface quality. The interfaces users touch. Page speed interaction fluency visual polish accessibility. You ship what users see and feel. The standard is: would you trust this product with your own money?
• Cross-surface component architecture. Shared components that work across web chat and extension. Design tokens component APIs responsive patterns. The technical infrastructure that makes three surfaces feel like one product.
• AI-interface integration. Streaming responses confidence indicators regeneration controls progressive disclosure. The frontend patterns that make AI intelligence feel trustworthy and responsive.

• How you think. You have taste - an intuitive sense of what "right" looks and feels like. You can defend component architecture decisions with behavioral evidence ("users scan left-to-right so the action goes here") not just technical arguments. You think about the person using the interface not just the code rendering it.
• How you work. You ship features end-to-end - from design discussion through implementation through deployment. Claude Code or Cursor is part of your daily workflow. You verify what AI produces. You write code that other engineers can read and extend. You care about performance because slow is broken.
• What you've probably built. Consumer-facing web applications with meaningful traffic. Component libraries or design systems. Streaming or real-time interfaces. We care about the live URL and the craft behind it not which company logo was on the door.
• Who this isn't for. This role is wrong if you prefer backend infrastructure to user-facing interfaces. It's wrong if "pixel-perfect from a Figma spec" is your primary workflow - there won't always be a spec. It's wrong if you treat Tailwind as optional or have strong anti-React convictions. You'll thrive here if you care about craft ship fast and like working at the intersection of design and engineering.

• Total first-year comp: $325000 - $425000 (base + equity + profit sharing).
• Base: $200000 - $260000. Top of market.
• Equity: PIUs - $0 strike Capital Gains actual ownership from day one.
• Profit sharing: Annual FCF participation.
• Liquidity: Annual tender offer.
• Benefits: 100% premium coverage. Unlimited PTO.

What We Do

Product.ai (formerly Demand.io) is the truth layer for commerce. Built on Axiomatic Intelligence — a proprietary adversarial reasoning methodology that stress-tests product claims against physics economics and engineering constraints — Product.ai delivers verified purchase verdicts not summaries. Product.ai tells consumers when NOT to buy. Product.ai emerges from Demand.io a profitable bootstrapped AI commerce company whose SimplyCodes platform processes over $1B in annual transaction value with a team of 20. Founded by Michael Quoc.

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