Both of these examples are generally relegated to the well heeled homeowner due to the costs and individualized nature of the final product.

I have a full time job that I love as a product design engineer and I want to fulfill my other dreams which is owning my first Multifamily home.

I'm got to figure out what to do with my owner occupied single family, before I move on to another deal, and may be looking out of Mass for my next. 

This originates more from single family sales, where there is an "option" to do any repairs required by the buyers' lender, up to a certain amount.  

I have invested in single family homes in the past.

My goal - to be netting $30,000 a year from rental properties (probably single-family homes).  

Be the first one to make decent mortgage origination software, make a boat load of money because you've got a monopoly product. 

I am finally at a stage where I feel confident enough to start investing but not sure which is best for me (Single fam, apt, etc.).

Lets say I find a Single Family 2/1 for between 50-70K in a neighborhood where the comps are 90-120K and rent is going for 1,300/month. 

My two cents is that if you had a good experience with any professional by all means pass on their name (it's buyer beware -- people asking for referrals should know that it can go either way in starting a relationship with a referred professional), unless you know of something that's causing the professional's work product to slide.