In-memory datastores are crucial for high-frequency, low-latency workloads in various industries. However, existing solutions have stagnated with technologies from over a decade ago. The authors, Roman Gershman and Oded, experienced these limitations firsthand while working at Ubimo and later at a cloud infrastructure company. They decided to create Dragonfly, an innovative in-memory datastore designed for modern workloads. Dragonfly's novel architecture enables vertical scaling and supports atomicity guarantees for all operations. It is a modern replacement for Redis and Memcached, offering simplicity, cost savings, and high performance.