A self-hosted trio of small apps — lunch ordering, reminders, birthdays & gifts — on one shared spine: Authentik SSO and a common notification service.
Three small apps the household actually uses, sharing one login and one way to notify people — instead of three ad-hoc tools with three logins.
React + .NET 10 Minimal API + Postgres, a Vertical Slice per feature. The reminders app and the notification skeleton come first; the domain calculators are done and test-backed.