Usually, one page CV is considered the norm — a one-page resume. Recruiters who view several hundred resumes a day prefer to receive basic information about the candidate in the most concise and clear form. As a rule, you can easily fit work experience, hard and soft skills, training and other points that the candidate considers important to note on one page, so the one page CV format is as widespread as possible in the IT industry, including.
By the way, one of the key differences between developers in different countries is connected with the CV: for example, in Eastern Europe, candidates may often have not quite up-to-date resumes or, in general, not quite “according to the standard”. This is due to the different conditions of the IT hiring market: in Eastern European countries, the market, as we have already written, remains the candidate's market, so IT professionals often do not focus on compiling an ideal CV, because there is already quite high competition for each experienced candidate.
In Western European countries, on the contrary, the market mainly belongs to the employer, so an up-to-date, well-written CV is one of the ways.