Bilingual admin portal for an automated assessment platform

A public-sector client was automating assessments. The portal needed self-registration and staff administration in two languages while backend contracts kept changing.

Sole frontend engineer in a multi-team agile programme, delivering sprint by sprint alongside the AI, backend and DevOps teams: UI, UX, API integration and tests.

• Architecture: Feature modules on Redux Toolkit, one HTTP layer for tokens and retries, and shared admin components that new screens reuse.
• Frontend: A six-day clickable prototype of the assessment console, then the portal from Figma designs, with right-to-left switching.
• Security: Locked-account handling, silent token renewal from an HttpOnly cookie, idle sign-out and role-gated routes.
• Infrastructure & DevOps: Maintained the frontend's multi-stage, non-root nginx image on the DevOps team's platform.
• Testing: Concurrent token refresh, expired reset keys and locked-account sign-in under test; 84% statement coverage.

• A moving API contract. The backend's error format changed mid-project. I wrote one error service instead of patching screens: the server's message in the user's language first, then field errors, codes and HTTP status. Within two days it covered sign-in, registration, password reset, settings, user admin and token refresh.
• One expired token, many requests. Parallel requests failed together when a token expired; now they queue behind a single refresh, and a logout flag clears the queue. Trade-off: shared state in the HTTP layer, covered by dedicated tests.

In six weeks: from prototype to self-registration, password recovery and user and role administration on the real gateway API, with 385 passing unit tests.