Software engineering · infrastructure · writing
Lucas Weis Polesello
I write about software engineering, infrastructure, reliability and practical lessons from building and operating systems.
Latest blog posts
View all postsApr 23, 2026
Why Your p99 Latency Destroys Node.js Event Loop Throughput - Theory and Practice
An interactive M/G/1 queue simulator that shows why a slow tail latency wrecks throughput — and what the event loop cost really looks like.
nodejseventloopperformancequeuing-theorymg1
Apr 5, 2025Bitmaps for Access Control: Scaling Notification Fan-Out with Redis ACL Checks
Why bitmaps are an efficient way to do access-control checks for high-volume real-time notifications, and when to use them.
notificationsdatastructuresbitmapsredis
Mar 30, 2025The Tale of How We Paid Back Years of Tech Debt in a Month
How an oversized IAM session object caused cascading infrastructure problems, and why trimming hot-path data models often beats scaling.
redisbandwidthcost