What is the best time to contact you?
From Europe this would be in the afternoon, from the US during normal business hours.
What databases do you use?
This depends on the project, but PostgreSQL, Redis, and CouchDB are on our shortlist.
What programming languages do you use?
Mostly Google Go (GoLang) for the back-end and JavaScript (Vue.js) for the front-end.
Do work only with public clouds?
No, depending on your project, other options, like your own servers are an possible.