Hi, I'm Nhân Nguyễn 👋
Backend developer focused on building scalable services with Java and PostgreSQL.
I write about system design, REST & gRPC APIs, microservices, DevOps practices, and lessons learned from shipping production systems.
$ alias me="backend engineer @ zcrossoverz"
❯ whoami
Nhân Nguyễn
❯ cat skills.txt
Java · Docker · K8s
PostgreSQL · Redis · Kafka
REST · gRPC · Microservices
❯ _
Java Concurrency: From Banking Race Conditions to Designing Systems for 10,000 TPS
A deep dive into Java Concurrency for Senior Developers and Tech Leads, featuring a banking case study and production-grade solutions.
Read more →The exponential curve nobody shows you — why tool users and system builders end up in different galaxies, and the 4-part system I am building to cross the gap
There are three tiers of AI users and the curve between them is not linear — it is exponential. Here is how I draw the curve, why the gap keeps widening, and the personal AI system + multi-agent + distribution playbook I am running to climb before the window closes.
Read more →AI is quietly eating my brain — cognitive atrophy, the new bottleneck, and the 5 rules I now live by
The uncomfortable pattern I noticed in myself after 18 months of heavy AI use — the symptoms of cognitive atrophy, why the career bottleneck has shifted from execution to judgment, and the habits I forced on myself to reverse it.
Read more →Process vs thread vs coroutine — stack layout, switch cost
Processes, Threads, and Coroutines: Stop Trusting the Sandwich Layout and Understand TLB Flush
Read more →Let's Connect
Interested in collaborating, have a question about a post, or just want to talk backend engineering? Reach out — I'm always happy to chat.