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Quick version of what you just signed up for: one deeply-researched essay a week, on the systems behind the systems. No hot takes. No AI-paraphrased summaries of someone else's blog post. No "10 things every engineer must know." Just the slow, careful version of one idea, done properly.

Everything here runs along three threads:

• Systems: failure modes, consensus, idempotency, replication. The unglamorous primitives that decide whether your 3am page is annoying or
  catastrophic.

• Databases: B-trees, storage engines, indexes, contention. What your database is actually doing under EXPLAIN ANALYZE, minus the textbook fog.

• AI Engineering: structured outputs, tool use, context windows, evaluations. The engineering discipline that most "AI agent" tutorials skip entirely.

The goal is simple: when something breaks, you understand why it broke, not just what to type to make the alert go away.

If you want somewhere to start, the next issue lands in your inbox in a few days. If you'd rather not wait, the archive is open at themainthread.beehiiv.com and explore.

One small favor: reply to this email and say hi, or tell me what you're working on. It teaches email clients we are not spam, and honestly I read every one.

Glad you're here. Talk soon.

Anirudh
The Main Thread

The Main Thread
A serious systems journal for engineers. One careful essay a week, written by Anirudh Sharma.
Principles over hacks. Systems over shortcuts.

Written something you disagree with? Good. Reply to this email - I read every one.

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