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Yes. It was one contract only and I was the lead frontend dev.

I wrote a very lightweight JS framework (it was just a few classes really) so we could have plugins. A plugin implemented was just an object that implemented an interface, I also wrote a poor man's React for two or three pages that needed to build a lot of DOM Dynamically.

At launch the site was getting basically 100 on the lighthouse tests with the gzipped CSS and JS coming it at ~80KB. Of course that lasted for a week because people will put up a huge image that hasn't been optimised for the web.

The site was fast because I wrote it like a website from mid-2000s. Everything was basic OOP and almost all the code was procedural.