Does having a new website design and code affects the SEO
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Dear experts,
We are in the process of completely revamping our website code and design to a new version of prestashop.
Having mentioned that, please note that we are not changing the URL links. So, the same products links will be the same and intact. Only the content is changing.
So, how this is affecting my website SEO or SERP?
Regards,
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Yes it will. It's hard to say if it will be a negative and a positive change though.
There are a lot of elements that come into play as far as rankings and a lot of those elements are on-page elements (real estate / position within the page of content blocks, links, images).
The bottom line however is that since the urls will stay the same it's only half of the issue in this case

As long as it will bring improvements on the UX side you are safe even if for a short time google will "dance" with your rankings...
If you do see negative impacts at least you can pin point how important your on page elements are and if you really assess the situation and the difference you can improve and go even better then before.
Trial and error is the best approach on SEO - and on your case this is the best time to do a new session

Hope it helps.
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It can help hurt or stay the same if you have the same CMS better chance of nothing changing
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Nice response eyepaq.
By the way, what's UX?
Well, one part I'm worried about is the number of links per page. Currently I have warning in almost all the website because I'm exceeding the number of links per page. And in the new website, these links will double because I'm adding extra big navigation plus many related links on the sides.
So, how would this affect as well???
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If your content is changing it will definitely affect your SEO positioning. Though there's no way of telling if it will have a positive or negative impact.
One thing I would suggest is make sure that you are using the proper keywords in your content(no keyword stuffing) and that you use the proper keywords in page titles, meta, etc.
Beyond that it's all up to the content you put in place.