We get 5xx errors on dugunbuketi.com. Especially, we get errors when our editors editing posts on wp-admin. Wp-admin works too slow.
Also we need optimize site speed.
We use Siteground 5 CPU Cores, CentOS, 12GB RAM, 60GB SSD, cPanel, Cloud Storage, Management Services
We offload images to AWS S3 with WP-Offload Media plugin.
We use Cloudfront CDN and Cloudflare Pro
We use SG Optimizer, WP Rocket(Premium), Perfmatters plugin, Php 7.2
I can provide you paid premium plugins if you need.
This is a growing startup web site. We have 330K montly visitors, and hundreds of paid B2B members. So, downtime is very important for us. You must work at night (GMT +3, Istanbul-Turkey).
We are looking for long term team members.