Summary
Vanmanh Dao is a backend software engineer with 11 years' experience building high-performance, failover-resilient services, currently working at PayPay Card in Tokyo. He has designed and implemented core features for large-scale payment systems at Rakuten and decomposed legacy platforms into microservices at Money Forward, routinely working with Go, gRPC, Protocol Buffers, MySQL and cloud-native tooling. An active open-source contributor and speaker, he published tools such as mysql_warmup and has presented practical talks on unique ID generation and async RPC in Go. Comfortable across Ruby/Rails and Java stacks as well, he mentors teams on Kubernetes and CI/CD and focuses on turning large data volumes into actionable customer insights. Colleagues know him for combining pragmatic engineering with a clear emphasis on observability and failover testing.
11 years of coding experience