Alex Rios Substack
Alex RiosInsights on system design, engineering leadership, and navigating the Staff+ career path from 17+ years in the trenches.
| Platform |  | Pricing | Freemium | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 25 | Subscribers | Read | alexriosme.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
The architecture of decisions nobody made
You join a new company. Week two, you’re poking around the monolith. You notice the authentication layer has three different patterns. One service uses JWT validation with a shared secret. Another calls an internal auth service over gRPC. A...
The substitution that isn't happening
In July 2025, the research organization METR published a study that should have made more noise than it did. Sixteen experienced developers, people with years of contributions to large open-source repositories, were given 246 real programmi...
How to size things you have never built
I was in a design review for a new notification service. Good proposal. Neat architecture. Solid API design. Then someone asked, “How much storage will this need in a year?” The room went quiet. The proposing engineer hesitated, said “I’ll ...
The attention economy inside your company
Here’s your Tuesday. You open your calendar and count six meetings. Between them, you have four gaps of roughly thirty minutes each. Your manager pings you at 10 am to ask why the feature is behind schedule. You do the math: two hours of “f...
Authors
The writers behind this newsletter.
Former Carioca \ud83c\udfd6 living in Curitiba \ud83c\udfd4 ⛩️ Supreme Leader ⛩️ Author of "System Programming Essentials with Go" and "Learning Zig". Texts about Tech Leadership, software engineering.
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