01
MonetKit
featured · lead design & development A cross-platform subscription management platform in the spirit of RevenueCat. Owned the core backend, public API, SDK API, webhook pipeline, entitlement system, and admin portal — normalizing the full billing lifecycle across Apple App Store, Google Play, and Stripe.
provider event→ transaction · subscription→ entitlement→ outbox→ customer webhook
- —3 billing providers normalized into one canonical event model
- —4 product areas owned end-to-end: core backend, public API, SDK API, portal
- —Idempotency, deduplication, retry with backoff, Transactional Outbox
NestJS TypeScript PostgreSQL Redis RabbitMQ Stripe Apple / Google IAP
read full case study → 02 OTTclouds Streaming Platform
Built and optimized HLS/LL-HLS streaming infrastructure with a custom video player and analytics — improving playback delivery, viewer-experience tracking, and day-to-day streaming operations.
HLS / LL-HLS Wowza SRS CloudFront Lambda@Edge
read full case study → 03 Reliable Billing Webhook Pipeline
Event-driven billing pipeline hardened against duplicates, out-of-order events, and service crashes — idempotency, deduplication, a canonical event model, Transactional Outbox, retry with backoff, and a full audit trail.
RabbitMQ DLQ Transactional Outbox PostgreSQL
read full case study → 04 Backend Observability Platform
Observability on the LGTM stack: centralized logging, metrics, distributed tracing, and dashboards that shorten incident detection, investigation, and debugging across backend services.
Grafana Loki Tempo OpenTelemetry Prometheus
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