Engineering Deep Dive
Technical writing on architecture decisions and lessons from production.
Featured
December 202518 min read
Architecting for N-Tenants: Database Connection Exhaustion
How we scaled from 300 to N tenants without adding infrastructure. The fix? Replace eager connection initialization with lazy loading, promise caching, and LRU eviction.
Impact Snapshot
Before3,000 connections at boot
After0 connections at boot
Result94% reduction in peak connections
#Node.js
#System Design
#MongoDB
#Multi-Tenancy
#Microservices
May 202612 min read
Event-Driven Microservices: Decoupling Services with RabbitMQ
How backend services publish events through RabbitMQ instead of calling each other directly, with retry queues, dead lettering, and idempotent consumers, built as an event-driven system from day one.
Impact Snapshot
ArchitectureEvent-driven from day one
Scale1M+ events/day
On failureAuto-retry, then dead letter queue
#Node.js
#RabbitMQ
#System Design
#Microservices
#Event-Driven Architecture
August 202610 min read
The Transactional Outbox Pattern: Making Event Publishing Atomic
How to guarantee a database write and the event it triggers either both happen or neither does, closing the one gap the RabbitMQ post left open, with a polling relay, a change-stream alternative, and where else the pattern applies.
Impact Snapshot
ClosesSilent event-loss gap
MechanismSame-transaction outbox row
DeliveryStill at-least-once, by design
#Node.js
#MongoDB
#RabbitMQ
#System Design
#Distributed Systems