Dishonest recruiting and employment practices:
When I was recruited I was promised a 9-5 schedule with some on-call shifts. In actuality, I discovered shortly after accepting the role that 40% of my evenings required 8-9PM conference calls with folks in Tokyo. This forced me to relocate my entire family from the East Coast to WA within 90 days of accepting the role so that I could end my workday at a reasonable hour.
Legal Issues:
Less than a year later, the company violated federal law and then retaliated against me for pushing back on the violations. I resigned in disgust as a result of the retaliation, but an employment related government agency ultimately agreed that their actions were illegal and I was able to be compensated for the ordeal.
Ethics Issues:
During my relatively brief time there, I became aware of situations where the General Counsel signed off on contract language making false cybersecurity assurances. I objected to the language in question and engaged our outside counsel to try and block the fraudulent contracts from being signed, but our general counsel determined that the risk of the fraud being discovered and litigated against was low enough to justify continuing to agree to that contract language for lucrative deals. My jaw almost hit the floor when I heard the decision!