Gamified Commerce · High-CCU Scale
Play In The Box
Burning Bros · KoreaFrontend Engineer — Performance & Reliability03/2026 — Present
Gamified e-commerce for Korean fandom merch — gacha box-opening, raffles and campaign drops including The First Fan × G-Dragon — built to survive its own launch-day traffic spikes.
Headline result
38s → 620ms
p95 latency, at ~30k concurrent users
What I delivered
- Diagnosed and fixed a ~30k-CCU production outage: p95 latency 38s, 50k/min 5xx
- Root causes: cache stampede, sticky 404s, unbounded HTTP socket growth
- Authored the edge-caching + ECS auto-scaling design, validated by an in-region k6/EKS rig against production
Stack
- Next.js 16
- NestJS
- Redis
- BullMQ
- AWS ECS
- CloudFront
- k6