As someone who has read countless resumes for the standard set of tech jobs, one page should be more than enough space. If you have a portfolio or can point to online projects you've worked on, then put a link in the resume so potential employers can review your work if they're interested.

I used to say that if you have more than a page there better be a Nobel prize on the 2nd page. However, these days if you put more than a page worth of stuff in your resume then chances are few people will read that far. Maybe that's okay if you're keyword stuffing for machines to parse your resume, but I suspect you're applying for the wrong jobs if you do that. Just the highlights please.