Modernizing a Massive Monolith
summary
Square Dashboard upgrades Ember across a decade instead of rewriting, using code mods, decaffeinate, lints and a 3–8 engineer upgrade team to keep pace while product teams verify changes. The repo sees ~140 contributors and ~1,500 commits per quarter and over 600 past contributors, and the effort converts 800 models from Ember Model to Ember Data. The monolith decomposes into addons and engines, loads a React lazy‑loaded addon for photo editing, and cuts local rebuilds from 30–60s to 3–5s.
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chapters (5)
- 0:00Start
- 7:13Upgraded to Ember 1 7
- 9:42The Year of Upgrading
- 18:46Upgraded to Ember 3 16
- 22:23Why Engines
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