What are your requirements? I can recommend to you a Toyota Corolla or a F150 pickup truck but without any knowledge what you need there won't be good answers. Some startups are blogs, others combine several third-party APIs and yet others are very data intensive.

(I'm running AWS, Linode, DigitalOcean, bare metal server myself, all depends on what the project needs).

I am running a payment platform that uses go, postgres, and several third-party APIs as well as offering one myself.