It's built with PHP on Laravel and using PostgreSQL database. Also writing some plain JS and jQuery (from old habits, maybe will switch to something more modern at some point). Hosted on Digital Ocean and server is installed with Laravel Forge.
I recently started using Cloudflare for caching and it does seem to speed up the site, but should probably think more about caching in the future. There's a lot of content that I could cache and serve directly from cached html files (for example, I could run a cron script to cache remote company profiles).