Front End Developer - Labrynth

Infinity Constellation is a company that builds AI-powered platforms to streamline regulatory complexity. They are seeking a Front End Engineer to own the client-facing B2C experience for an AI-assisted patent intelligence platform, focusing on onboarding, user experience, and guided exploration.

Responsibilities:

• Wire up the BFF client: consume the checked OpenAPI contract via generated clients, and establish stable success/error envelopes, request IDs, idempotency-key and If-Match plumbing, and loading/empty/error/permission state scaffolding
• Build invited sign-in and account context: Cognito sign-in (email/password + Google, PKCE) wired to opaque BFF sessions and protected routes, with explicit account-context switching on staging
• Stand up the guided-exploration entry point: exploration create/run UI wired to the agent and the public corpus, showing the operation lifecycle via resumable SSE on staging
• Conduct a UX & code audit: review for correctness, performance, and consistency; produce a prioritized fix list and a design-system alignment plan
• Invited-account onboarding: invitation acceptance (personal signup / team membership), first workspace creation, first source upload with visible quarantine states (upload_pending → quarantined → processing → available|rejected|processing_failed), and ToS/legal-disclosure acceptance
• Account & membership UX: personal/team accounts, owner/member capabilities via capability policy v1, membership states, and guarded personal↔team conversion flows, with the active account always explicit and never inferred
• Guided exploration experience: the primary entry point over the workspace/exploration/idea/draft model, surfacing exploration lineage (derived_from / incorporates / branches_from / supersedes) and the operation lifecycle (accepted → dispatched → executing → succeeded|failed|cancelled|expired); raw model chain-of-thought is never shown
• Durable-operation progress: fetch-based resumable SSE (auth via header, cookie, or storage; reconnect replays from the last-seen event sequence; respect streams/session and account limits), with cursor-polling fallback and 409 cursor_expired snapshot/resync
• Public graph & analysis views: production-quality visualization and core claims/novelty/cluster views over the public reference plane
• Billing UI (beta): Stripe test-mode plan selection and entitlement display, with no live charging
• Performance & robustness: meet agreed Core Web Vitals budgets; consistent loading/empty/error/permission states; responsive and accessible UI
• Test coverage & handover: component and E2E coverage for critical paths, documented component patterns, and clean handover