1. Rhel 9 (alma/rocky linux) on a vps (don't really matters where, aws, azure, do, hetzner, wherever).

2. Postgres 15

3. Python 3.10/Django 4.x served with gunicorn

4. Jquery and or alpine js

5. Bootstrap 5

6. Caddy to serve everything

7. S3 if a lot of file uploads are needed

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I'd definitely keep using the same stack post mvp by vertically scaling the db, horizontally scaling the app servers.