I'm the sole developer of the local search engine [login to view URL], dedicated to my country "New Caledonia".
The whole product (front-end, back-end, crawling), took a bit more than 6 months. I had prior experience with React, but not next.js.
I'm pretty happy with what I've done UI wise, it runs fast, but I've noticed that the UI renders several times (I've investigated this a long time ago, but I think I get at least 4 unnecessary renders).
I works pretty good on the latest smartphones, but any lower end, or older smartphones, will display a shacky UI.
Right now I have a lot of work to do on the crawling side, and not enough time to investigate this issue.
To sum up : I would like to find an expert in [login to view URL], even better if you also know react-instantsearch (because I know the performances issues comes from this library). Your goal will be to speed-up the UI rendering.
The code base is not huge either, this should be a few days (2-3) work only.