This. My Aunt was a career counselor for the past several decades. She won't let me use a resume longer than one page.
You don't need to list ever job you've had since your first part-time job flipping burgers during high school. Just try to figure out what they care about and list that prominently. If they want to know more, they'll ask about it. That said, make sure you summarize things in a way that doesn't make it appear that there are large gaps in your resume, though you may still have problems if your most relevant experience was ten jobs ago.
For a tech job, you want to focus on things like what tools you've used, what problems you've solved and any awards or achievements that you can brag about. If you really feel that you can't leave anything out, put a note on there with a link to an online copy of your CV which, unlike a resume, is supposed to list everything. Then watch how many hits it gets to see how little people care.
