Technical Due Diligence when acquiring SaaS app

Hi There- Wanted to see if this community had any recommendations on a company that could help with technical due diligence from an acquisition? Long story short but me and 2 partners are looking to buy a few small SaaS apps and use our marketing/sales skills to grow them. Unfortunately, we don't have coding backgrounds. We'd be open to hiring a company or an individual to help us with the technical due diligence. Any recommendations/suggestions?