Replacing several ephemeral SSE channels with one table-backed notification stream — 25-second heartbeats, Last-Event-ID replay and runId correlation across async workflows. A walkthrough from the wire up.
Two services used the same BullMQ queue name under different Redis key prefixes, so every OCR extraction result was enqueued where nothing would ever read it. An incident write-up.
Automated Indian GST compliance, multi-way ledger reconciliation, GSTR-1/3B return filings, and an asynchronous AI-powered invoice extraction pipeline.
Real-time dynamic QR campaign lifecycle engine with distributed Redis locking for atomic inventory redemptions, sponsor ad delivery, and live SSE analytics.
Replaces paper health-visit logs with a proof chain — physical presence, on-device ECDSA signing, async fraud scoring and EVM blockchain anchoring.