I used to have only 1 CV (like you, I assume). Not anymore. Now I have some sort of a template with fixed parts (e.g., education, past experience)... but whenev

I used to have only 1 CV (like you, I assume). Not anymore. Now I have some sort of a template with fixed parts (e.g., education, past experience)... but whenever I apply for a company I put on my CV 90% or so of the keywords they are looking for. I usually know very well around 60% of what they are looking for, and have a bit of knowledge of everything else. So, for instance if they say that knowing Nginx is a plus, well, I put I used Nginx in some of my old jobs. I certainly know a bit of Nginx but I'm no expert. The point is that when they open my CV, they get to see their keywords. Obviously this technique is only useful to pass the recruiters/screeners. When I get to talk to engineers and managers, I take it more seriously.