Basement waterproofing recommendations?

Hello neighbors, There is a tiny bit of water that occasionally seeps in at the junction of the walls and floor and darkens the concrete/stone... not a real puddle... but enough to cause (unfortunately) severe mold growth over the years. If you have had a good (or horrible) experience with basement waterproofers in your Pgh home, could you please email me with recommendations or warnings? So appreciated! -Becky