I'm with a company that was acquired by IBM ~2.5 years ago. The internal systems are definitely rough, but for the most part it's business as usual.
I've heard chatter from our engineering leadership that IBM is trying to push some silly initiatives, but we've been able to prioritize the right work so far.
I also get more equity (one time award + employee stock purchase plan) than I did previously, and with how IBM stock has been performing lately this has been a net positive for me.
FWIW I have heard that IBM used to force their management style on acquisitions in years past, so perhaps this is a fairly recent shift towards a less hands-on approach.
> FWIW I have heard that IBM used to force their management style on acquisitions in years past
Definitely wasn't like that for Red Hat. We had a CFO with an IBM past which was a really nice guy and never ever felt like he was parachutes from IBM.
Now after 6 years legal, HR and finance will move to IBM starting next January; but my perspective from engineering is that after the acquisition it's been and remains business as usual.
I have no idea how it was for Hashicorp.