sudo can't be used for filesystem access directly: it only tells you which commands a user is allowed to run.
What you could do is to write a set of scripts that will let your developers read your system files, and configure sudo to only run those scripts. They could even be fairly simple scripts, i.e
Code:
#!/bin/bash
cat /var/log/messages
Another option would be to set up a read-only samba share containing the files, and give the developers password-protected access to that. That way, they don't even need shell access to the machine.