I received an OA invitation through HackerRank shortly after I applied (early October). The HackerRank consisted of 4 problems. All of the problems were fairly difficult, especially the last two. I was rejected after completing the HackerRank.
I applied through college or university. I interviewed at Snowflake in Feb 2020
Interview
2 technical rounds, straightforward question and answer, allowed to ask for help. The engineers paid attention. Then 1 talk with the manager that was not technical and more question and answer both ways.
Interview questions [1]
Question 1
You have a sorted binary tree, see if there are 2 numbers that add up to a specified value within the tree.
I applied through college or university. The process took 2 weeks. I interviewed at Snowflake (San Mateo, CA) in Mar 2016
Interview
I met the company representatives at the career fair and submitted my resume there. I then received a follow up email in 3 weeks time requesting an initial phone interview with a recruiter where we chatted about my interests and career plans. This was followed up by two difficult technical interviews which over Skype which involved coding and multiple rounds and discussions over possible flaws and optimizations. The process was sped up to fit into a period of 9 days since I had an offer pending from another company.
Interview questions [1]
Question 1
Signed an NDA. Cannot disclose the exact questions but they involved data structures and dynamic programming.