For a good portion of my last job, I was able to lead a team tasked to rebuild & redesign the architecture of ExpertFlyer.com, which was a property that my company bought. The original site was around 15yrs old, we totally rebuilt it in Go, React,& Typescript.
The version I was working on wasn’t fully launched when I left the company, but it was very near completion. I can not speak to what happened to it after I left, but we put a great deal of time into making it very fast, responsive, & everything you’d expect from a modern web application.
However, we did launch an Open Beta as part of a partnership with American Express & Hilton while I was there. You can read about it on ThePointsGuy.com here.