palaniappan p4 min
Scale a Legacy Monolith on AWS Before You Split It (2026): Vertical, Read Path, Cache, and Queue Offload Ladder
On a composite B2B order API (~2.4k RPS peak, 24 ECS tasks on Aurora), running the scaling ladder in order — RDS Proxy, read-replica routing, ElastiCache, then SQS offload — moved modeled p99 from 1,840 ms to 72 ms before any microservice split.