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That's an interesting question and something that hadn't really occurred to me. Personally, over the past few years I've been a developer, a product owner and now a product manager. But if I were to apply for a new developer role, would I leave out my current product manager role from my CV? Absolutely not! It's generally considered a bad idea to have gaps in your CV. And actually having worked various roles can actu…
How about if I was a stay-at-home dad for a year? I haven't included that in my resume - I figured if I were asked I have no problem speaking about it, I'm actually super proud of it, it just doesn't strike me as something I should put in my list of experience.
It is something you should be prepared to explain at an interview, but I don't think it would cause any problem.
You're right that it doesn't really count as experience. Employers won't necessarily mind a one year gap on your CV, but if you do find it difficult to get to the interview stage, it could help to add a short note to your CV explaining the gap. But I'd hope that wouldn't be necessary.