Not sure if there's a company that could handle both (or do it well anyway) since one would be more focused on interior finishing and possibly mold remediation while the other would be on foundations.
AFAIK you can't make a basement waterproof. When this happened to me the fix was to put in a sump pump that would gather and pump away water that was under the slab before it could seep in. We sold that house not long after so can't say how effective it was long term but that's what I've been told.
They also checked other things like grading around the house (was fine in my case), downspouts that need to be extended so they don't drop water right at the foundation (I think we had some extensions added). I've heard of people needing to dig down and put more drainage under windows or weeping tile around the foundation etc..
Lots of variables like age of the house, grading, what's already there, etc.
Hopefully someone with more expertise can chime in but I would guess it'd probably be a different company you'd want to address any foundation issues.
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