Role Summary Builds the demand-side surface of the Token Factory : the end-user portal. Delivers sign-up / SSO flows, an interactive model-comparison playground, scoped API key management, usage and spend dashboards, prepaid token buckets, and the audit log viewer. What Youll Do Build the tenant-facing portal (Web + API) with signup / SSO (OIDC / SAML federated), projects, and team management. Deliver an interactive playground with live model comparison against the Token Factory inference endpoints (SSE streaming). Build scoped API-key management, rotation, and usage attribution. Deliver real-time usage and spend dashboards sourced from the metering pipeline. Build the prepaid token-bucket flow : purchase, balance, auto top-up, low-balance alerts. Build the audit-log viewer with filtering, retention, and export. Collaborate with the backend engineer on API contracts; collaborate with SRE on observability. Must Have Strong TypeScript with a modern React framework (Next.js preferred). Comfortable with SSE / WebSockets for streaming inference UI. OIDC / SAML integration experience; short-lived token handling. A practical sense of UX not a designer, but can execute a Figma spec cleanly. Comfortable with a Go / Rust backend enough to build a sensible API contract. Nice To Have Previous experience building a developer-facing console (API keys, dashboards). Prior work on billing / metering dashboards. Shadcn / Tailwind / design-system experience (ref:hirist.tech)