A/B testing designs in the world's most popular language learning app: https://firstround.com/review/the-tenets-of-a-b-testing-from-duolingos-master-growth-hacker/ (postpone signup, let users try it!)
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1
As a kid I didn't particularly like bosses in games: they were a bother that you couldn't skip. Now, I see so many bosses with *amazing* designs.
I think I'm just less intimidated. Platformers also let you wait until you're ready more often too.
7
Igalia's post on self-hosting CI runners is a masterclass in build engineering. It shows dealing with weird API constraints, but still finding good designs.
I also learnt that some CI systems use OCR on Apple's installers to automate!
What software designs require clean slate 'revolution' implementations, rather than evolution?
I can think of: borrow checking in a PL (existing code is unsafe), microkernels (architecture is too different from monokernels), and full REPLs (can't add type redefinition later).