I'm a PostgreSQL Performance Consultant & NestJS Backend Architect. I specialize in stabilizing high-scale databases (18TB+) and preventing financial race conditions.
Recent Result:
→ Stabilized 18TB Fintech PostgreSQL cluster
→ Reduced database operations by 57% (1,760 → 760 per request)
→ Achieved 5+ months of 100% uptime
→ Compressed backups from 18TB to 7.5TB using pgBackRest
| Repo | What It Solves | Technology |
|---|---|---|
| bulletproof-fintech-ledger | Prevents double-spending using Pessimistic Locking | NestJS, PostgreSQL, TypeORM |
| postgresql-10m-performance-demo | 2000x query speedup (2.1s → 1ms) using BRIN indexes | PostgreSQL 16, SQL Optimization |
| nestjs-idempotency-pattern (Coming Soon) | Handling duplicate webhooks safely at scale | NestJS, Redis, Unique Constraints |
| Layer | Technologies |
|---|---|
| Database | PostgreSQL 14-17 · MongoDB · Redis · Aurora |
| Backend | NestJS · Node.js · TypeScript · Express |
| DBA Tools | pgBackRest · pg_stat_statements · EXPLAIN ANALYZE |
| Infra | AWS (RDS, S3, EC2) · Linux |
┌─────────────────────────────────────────────────┐
│ │
│ 🔍 Find the slow query │
│ 📊 EXPLAIN ANALYZE it │
│ 🛠 Fix the index / rewrite the query │
│ 📉 Measure: 2,152ms → 1.08ms │
│ ✅ Document everything │
│ 🔄 Repeat for next bottleneck │
│ │
└─────────────────────────────────────────────────┘
| 🌐 Website | waqasdb.com |
| 💼 Upwork | Hire Me |
| Connect | |
| consulting@waqasdb.com |
"I don't just optimize queries; I engineer stability."