Fine Margin CV template
The highest content density of any single-column template here: a smaller base size and tight spacing comfortably hold seven roles, four degrees, twelve skills and eight certificates on one page, with no colour and no boxes to trip a parser. It is the answer to "I have too much for one page but I refuse to send two". Below about eight years of experience it will look cramped for no reason — use Meridian Classic instead.
Nothing is locked. Switch to a different design later and your content comes with you.