Senior Track

Scaling Rails Apps

Most "we need to scale!" conversations are three different problems pretending to be one. This series builds the diagnostic muscle: where the bottleneck actually lives, the order to fix things in, and the engineering blogs from Shopify, GitHub, and Artsy that document how real teams found theirs.

1. Diagnose Before You Scale 2. Indexes & EXPLAIN 3. The Concurrency Model 4. Hot Rows & Contention 5. Caching, Properly 6. Background Jobs as a Scaling Tool 7. Pagination at Scale 8. Bulk Operations & Memory

Want to drill these? The matching Practice cards turn each lesson into a multiple-choice scenario.

Long-form companion

Eager Loading — includes vs preload vs eager_load vs joins

The four AR methods, side by side, with the SQL each one generates and when to pick which.

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