I'm using ACF plugin for custom fields for a custom post type.
WordPress has built-in REST API endpoints and if the endpoints called then all data is generated from the database and it takes some time to generate.
So the idea is to generate and update static JSON files when user change post in the admin panel.
We can consider it kind of REST API JSON cache.
And the important thing is to include all ACF custom field data and convert category/tag id to name.
For an expert, it will be an easy task and can finish it in 1~2 hours.
Budget is $30. If you don't agree with this don't bid.
Please write "WordPress Rest API Cache" in front of your bid message so that I can know you paid attention to the project detail.