Social Event Management Platform

Microservices SSO & Cold-Start Resilience: Managed cross-ecosystem authentication across multiple microservices (isce-auth, wallet-nest, and events APIs). Architected a dual-algorithm JWT verification pipeline (migrating from HS256 to RS256 JWKS) featuring in-flight request deduplication and cooldown caching to eliminate auth server stampedes during cold starts.

Next.js 16 & React 19 Tooling Adaptations: Overcame bundler breaking changes where legacy Workbox/PWA libraries conflicted with Next.js 16’s Babel 8 environment. Replaced fragile wrappers with a custom prebuild service worker pipeline and stabilized React 19 real-time Socket.io connections to prevent connection churn and memory leaks.

Real-Time Sync & Dual Notification Layer: Orchestrated active in-app messaging (Socket.io with auto-reconnection & exponential backoff) alongside background push notifications (Firebase FCM), handling edge cases around stale device tokens, unread counter race conditions, and browser permission quirks.

BFF Data Aggregation & Network Fault Tolerance: Solved frontend N+1 analytics bottlenecks and mismatched multi-service schemas by introducing a defensive normalization layer. Added smart retry mechanisms (distinguishing transient network drops from confirmed 404s/403s) to prevent false-positive error screens.

Zero-Downtime Auth Proxy & Stampede Protection: Engineered an edge proxy layer (proxy.ts + verify-jwt.ts) featuring strict algorithm pinning (dual-support for HS256 and RS256 JWKS). Implemented in-flight promise deduplication and cooldown caching to protect the auth server from cold-start stampedes, paired with double-submit CSRF cookie protection.

Custom Tooling & Decoupled Service Worker Pipeline: Solved Next.js 16 / Babel 8 bundler incompatibilities with legacy PWA packages by building a custom prebuild pipeline script (generate-firebase-sw.js). This dynamically injects runtime environment secrets into standalone service workers without reliance on broken Workbox wrappers.

Lifecycle-Stable Real-Time Sockets & FCM Integration: Stabilized Socket.io client connections across React 19 component lifecycles using ref-stabilized callbacks, eliminating teardown loops. Coupled this with exponential backoff reconnection, auto-resubscription, and a unified browser permission controller (usePermissions) with self-healing FCM token rotation.

Fault-Tolerant BFF & Defensive Data Normalization: Created a resilient data layer (actions/events.ts) featuring a typed status state machine (found, not_found, unauthorized, error) with automated 400ms retry delays for transient network glitches. Built schema normalization utilities and custom date/time parsers to eliminate SSR hydration mismatches across multi-service data models.