alt Hacker Newsmicroservices were an effect of the ZIRP era. you literally have places like Monzo bragging that they've 3 microservices for each engineer.
3 tier architecture proves time and time again to be robust for most workloads.
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Uvix • yesterday at 9:09 PM
Certainly no more than three tiers.
"Traditional" three-tier, where you have a web server talking to an application server talking to a database server, seems like overkill; I'd get rid of the separate application tier.
If your tiers are browser, web API server, database: then three tiers still makes sense.
1 micro-service per pizza sized team seems to work pretty well.
Put it into a monorepo so the other teams have visibility in what is going on and can create PRs if needed.