Bytes & B-Tree's
System Design RoadmapBytes & B-trees is a weekly newsletter for software engineers who want to understand databases from first principles — storage physics to distributed consensus. One production concept per issue, with working SQL scripts and demos in the GitHub vault.
| Platform |  | Pricing | Freemium | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 16 | Founded | 2 months ago | Last Issue | 9 days ago |
| Active | |||||
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bytesbtrees.substack.comLatest Issues
Issue #011: NULL and Three-Valued Logic: The SQL Traps That Cost You Silently
A payments company ran a daily reconciliation query for eight months before anyone noticed it was wrong.
A payments company ran a daily reconciliation query for eight months before anyone noticed it was wrong. The query aggregated transact...
The Vault — What’s inside the private GitHub repository
When you upgrade to a paid subscription, you’re added to the bytes-and-btrees-labs GitHub organisation within a few minutes. You’ll see every repository listed below — past and future — with full read access.
The vault grows by 3–4 a...
Start Here — What Bytes & B-trees is and how to get the most out of it
Welcome. This newsletter is a structured 3-year curriculum on how databases actually work — not how to use them, but how they’re built, why they make the decisions they make, and what happens inside the engine when your queries run.
Ev...
Issue #010: SQL and Relational Algebra — the formal foundation behind every query you've ever written
SQL looks like English. Underneath it is mathematics. Understanding the math is what separates engineers who write queries from engineers
A senior engineer at a fintech company spent two days debugging a reporting discrepancy. Their query...
Issue #009: Isolation levels visualised — from dirty reads to serialisable anomalies
Consider a banking application running a nightly report that sums all account balances.
Consider a banking application running a nightly report that sums all account balances. The report runs as a single long read transaction. While it run...
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| Subscribers | Engagement | 68 | Monthly Web Visits | ||
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System Design Interview Roadmap - Step by step process that will make you comfortable, familiar and then expert at System Design.
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