The interview was an interesting one - it was hard to get it - but I eventually got it. Initially I wrote directly to their email - got a task link to github - once I was done with the assignment I've wrote an email but got no answer back for 1-2 weeks. After 2 weeks, I've wrote them again (because I already had a different offer from elsewhere, but wanted to know what were my options) - and eventually got a reply and an interview. The interview was pretty simple and relaxed - I personally liked it.