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.
GST return status queries went from 3,000ms+ to sub-15ms at peak load by reading a precomputed projection that filing writers keep fresh through domain events. Requirements, options and the update path.
Four ways a GST portal integration lost or corrupted data while every request succeeded — a case-sensitive parameter, an unechoed field, a delegated rule and an over-broad sum — and how each was closed.
Automated Indian GST compliance, multi-way ledger reconciliation, GSTR-1/3B return filings, and an asynchronous AI-powered invoice extraction pipeline.
Enterprise conversational AI gateway grounding LLM responses on real business entities — clients, projects and active persons — from an entity catalog.
Real-time dynamic QR campaign lifecycle engine with distributed Redis locking for atomic inventory redemptions, sponsor ad delivery, and live SSE analytics.
Full-stack administrative platform for multi-tenant e-commerce operations, with a NestJS backend bootstrapped to migrate incrementally off a legacy PHP monolith.
Replaces paper health-visit logs with a proof chain — physical presence, on-device ECDSA signing, async fraud scoring and EVM blockchain anchoring.