SSH session logging
Solution 1:
If you are using Linux or FreeBSD, check out sudosh2:
sudosh is an auditing shell filter and can be used as a login shell. Sudosh records all keystrokes and output and can play back the session as just like a VCR. Sudosh2 is a continuation of the development of sudosh.
This will store a log of all TTY input and output (all keystrokes, including backspaces and other control characters). The output can be stored on the local machine, or can be sent to another server using syslog.
You don't state if your engineers are SSHing from a central server, or if they are all connecting from their own workstations. sudosh2 is ideal for a central server, but might be harder to implement on dozens of workstations.
Some others have used rootsh, but I am not familiar with rootsh.