Founding Engineer, Frontend

About Orthogonal Orthogonal (YC W26) is building the infrastructure layer for AI agents to discover, access, and pay for APIs. We're starting with go-to-market, the APIs that power outbound, enrichment, and growth. We're two technical cofounders in San Francisco. The Role This is a founding role, not a maintain-the-codebase role. You'll own how developers experience Orthogonal — the dashboard, API marketplace, and playground — making complex agent and API workflows feel obvious. You'll work directly with both founders and ship code users see immediately. What you'll do Build and own the developer dashboard, API marketplace (discover), and playground Design intuitive UX for agent and API workflows, auth, and real-time logs and usage Craft our docs, onboarding, and SDK/CLI developer experience Obsess over polish, performance, and responsiveness across the product Ship to production daily with Next.js; use AI tools heavily to build and iterate Who you are Track record of shipping polished, production frontend Expert with Next.js/React and TypeScript Real product and design sensibility, you sweat the details Care deeply about developer experience for technical users Self-directed and thrive with real ownership on a small team Nice to have Experience with real-time interfaces Interest in AI agents, APIs, and developer tools Details Compensation $150K–$220K + equity Stage YC W26, Seed Reports to Founders directly J-18808-Ljbffr