Slack's recruitment team were amazing, very organized and communicative during the entire process. Everyone involved in the interview process, both over the phone, video calls and in person were welcoming, warm and generally easy to interact with. They asked some great and tough questions, always keeping you on your toes. What I loved about Slack is while they did test your skillset to a degree, they were primarily testing you on your personality and whether or not you'd be a fit for their culture.