Multiple CMS on one website / domain & SEO

[Siphoplait]

For a client we would like to work with a content hub, but their website is build on a custom CMS so we are limited in our options and if we aks their web developers they ask crazy prices to help us.  So now we have the idea to build the content hub with wordpress and implement it next to their current CMS. for example on www.website.com/contenthub/ .

As far as i know this is technically possible and there are no negative effects regarding SEO as long as we link the two sitemaps together.

Am i right or am i missing something here?

[effectdigital]

When you blend different architectures you WILL get contextual tag collisions (e.g: canonical tags don't work the same across both architectures, or Meta robots tags, or hreflangs). What you are suggesting is probably the best thing you can do, I stand behind WordPress quite firmly, even when it's used to augment another CMS (instead of replacing it). That being said, if you believe you are going to be able to predict all the issues which arise in advance - think again!

Do your best on that front (obviously) but you need to manage your client's expectations. There is going to be some fallout. There is going to be analysis needed. There is going to be dev work needed to create a seamless integration. It's good that you're being diligent and trying to predict everything, but with the complexities of the modern web (the same thing can be coded in thousands of different ways) you really need to accept there will be some problems that will need fixing. You'll need to hold some budget back for that stuff, or you'll be up a gum tree