Eliminated single points of failure across all notification channels at production scale.

A real-time snack ordering system built for high-throughput cafeteria environments. Order intake is fully decoupled from processing — the REST API stays responsive under peak kitchen load while BullMQ workers handle fulfillment asynchronously. Redis caching eliminates 94% of redundant DB reads, and atomic locks prevent race conditions on limited-stock items before enqueuing.

Eliminated single points of failure across all notification channels at production scale.

Velox completely decouples notification triggering from delivery. Any upstream service drops a Kafka event without knowing which channels are downstream. A central router fans out to isolated Go workers — one per channel. Each worker owns its retry logic, rate limiting, and provider failover independently, so a Twilio outage never touches SendGrid throughput.

Eliminated single points of failure across all notification channels at production scale.

A unified identity plane in front of all internal microservices. Instead of each service implementing its own auth, they delegate token verification to Gatekeeper via a lightweight gRPC sidecar. Security policy, RBAC rules, and audit logs all live in one place — enforcing zero-trust defaults with under 2ms overhead per request.