Shopify → Fynd merchant migration platform. 6-stage fault-tolerant ingestion pipeline, 1M+ records migrated with zero duplication, now serving 50+ merchants end-to-end.
200–500 rec/s
p99 200–400ms
−70% ops effort
Node.js
Kafka
MongoDB
Kubernetes
Discount & promotion service, taken from zero to 97K MAU. Circuit-breaker-guarded dependencies, bounded error propagation, and health-signal probes keep it above 99.9% availability.
97K MAU
200–500 req/s
99.9% uptime
Node.js
Redis
PostgreSQL
Cursor-based streaming with adaptive chunk sizing and token-bucket concurrency. Cut peak pod memory 80% (1.5 GB → 300 MB) and runs 5–10 migrations concurrently under back-pressure.
−80% memory
5–10 concurrent
token-bucket
TypeScript
Kafka
Back-pressure
Internal platform for 10,000+ tutors at Byju's: onboarding, scheduling, audit, payroll. Cut payroll cycle from 3–4 days to 1 and removed the engineering bottleneck for 3 ops teams.
10K+ tutors
1-day cycle
3 teams freed
Node.js
PostgreSQL
React