[anon50118810]

It depends on what we mean by customizing. If you're strong in two different areas, for example both web development and devops, and you're open to both types of positions, you should have two resumes. However once you have these resumes, you should look for positions that fit the resumes and not vice versa.

Beyond that I don't think it's worth tweaking a resume for each ad, for example modifying word order. Nothing wrong with it exactly, but the gain is minimal because no one reads your resume that closely, and I think it encourages the wrong mindset for what is unavoidably a numbers game.