I applied online through Slack's career website, and began a process that took 3 weeks until I accepted the offer that I got. I went through the following steps during the interview process:
- Early phone conversation with the recruitment team
- Phone interview with the manager of the team that I applied to
- Online assessment
- After that I had a 4 hours long onsite interview which consisted in: 3 face to face interviews, with different members of the team, and an assessment.