[asidiali]

Google Sheets via Sheets API

https://developers.google.com/sheets/api

- free

- framework agnostic

- easy to integrate (IMO relatively easier than parsing a WP API, setting up proper taxonomy, etc)

- your user is probably already familiar with Google Sheets

- not ideal for sensitive info, that's ok because this is a portfolio site for public info

- not ideal for large datasets, that's ok because your user will have a relatively small, static dataset

Here's the sample frontend: https://developers.google.com/sheets/api/quickstart/js

If it was for a big client needing a business solution, sure I'd say you need to choose Wordpress as it is industry standard. But because it sounds like your client is an individual who hired you for their own personal needs, IMO Wordpress is overkill here.

Better yet, just hook up a YAML flat file, show them where it is in Github, and give them collaboration permissions :D