The Signal
Substacknewsletter · by Rui Diao
A former Google senior staff engineer's first-principles analysis of the tech that truly matters, finding the signal in the noise of AI, DeFi, and beyond.
- Audience
- Not shown publicly
- We show a dash rather than guess
- Observed frequency
- Monthly or less
- From 1 post indexed in the last 90 days
- Last post
- Sep 12, 2026
- Sep 12, 2026
- Likely audience
- software engineers interested in small-scale projects
- Inferred from post content
The Signal is a Substack newsletter by Rui Diao covering personalized recommendation systems, local public library technology and software engineering for small scale. NewsletterFIT indexed 1 post from it in the last 90 days, most recently on Sep 12, 2026.
Topics
- personalized recommendation systems
- local public library technology
- software engineering for small scale
- parenting and child development
- web application development
Recent posts
- Building a…
- I Built…
- Home AI…
- I Went…
- Home AI…
Sponsors detected
No sponsored posts detected in the last 180 days of indexed posts.
Detected automatically from posts marked as sponsored. Detection can miss or misread placements.
See the full picture on The Signal
Subscriber momentum over time, every detected sponsor with the source post, companies and people it mentions, guests, and an alert when any of it changes.
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Compiled from public pages · refreshed Nov 8, 2026 · How NewsletterFIT collects and labels data