I interviewed for two positions at Slalom. The first one, the recruiting coordinator said she would pass me through to the second round, but I never heard back from her.
Next, I was an internal referral for a position and was contacted. After six (6!) interviews, silence. I had to reach out twice and didn't hear anything for a month after my final interview.
Despite my hesitations, I recently spoke with their recruiting team about another open position and they were already considering me, according to the recruiter. That was a month ago.
They are in the midst of massive growth right now, it might be time for them to at least consider sending out form letters to people they don't hire.