Trade Finance Core Engine Migration
Legacy Architecture
Legacy PHP 7.4 setup running single-thread SQL commands that locked core tables during transaction peaks, causing compliance report requests to timeout or hang for 14+ minutes.
Rebuilt State
A decoupled architecture separating user dashboard views from back-end transaction operations. We deployed a NestJS gateway and tuned PostgreSQL index mappings for high concurrent read operations.
[ Client Dashboard (Next.js) ]
|
| (Rest API / HTTPS)
v
[ NestJS Core Gateway Node ]
|
+------------+------------+
| (Read Fallback) | (Cache Lock Verification)
v v
[ PostgreSQL Database ] [ Redis Cache Store ]
(Tuned Index Tables) (Automatic TTL Pruning)
01. The System Block
The client ran transaction reconciliations using cron jobs. When trade volume surged, the database encountered locks on the ledger tables. Compliance officers sat idle waiting for 14-minute exports which frequently crashed.
02. Structural Rebuild
We rewrote the transaction scheduler into a decoupled query pipeline. By separating operational transaction records from compliance reporting schemas, we eliminated DB table contention.
03. Metric Validation
Production logs show report latency now averages 3.8 seconds, even during peak trading windows. Concurrent transaction handling capacity grew 160x without database CPU throttling.
System Failure Report (Week 6-9 Analysis)
During load tests in Week 9, the Redis cache cluster locked up due to an aggressive session token TTL policy, dropping active user sessions. We halted features for 48 hours to rewrite the session validation layer with secure database fallbacks and strict circuit breakers.