[venusiant]

It are right that it is a good idea to leave a job without saying negative things about them.

The line "I felt like it was time to move on" is an adequate reason for leaving, and it's not something anyone is going to argue with. After all, leaving is a personal decision. In addition to that, three years is an above average length of time to stay in a technology job.

If someone directly asks you what you don't like about working there (such as in an exit interview), simply state that you don't want to answer the question. If they push you, simply state that you have no comment. It's a good idea to decline to answer all the questions in an exit interview. They don't have the right to force you to answer such questions.

If you a nervous about the initial conversation with your boss, kick off the resignation by sending a short email to HR saying that you wish to resign and you are giving your notice from that day (or whenever you prefer). HR will fill you in on what the procedure is and notify all the relevant people for you.

[Retra]

>It's a good idea to decline to answer all the questions in an exit interview.

Definitely. The exit interview is far too late to start caring about what your employees are thinking.