I've researching which software application to use to help me grow my SFR portfolio.

I agree with a lot of the advice already given (i.e. legal lease agreement, maintenance team, etc) i would HIGHLY recommend utilizing a property management software to run everything through.

If you have only 1 month supply everything sells and sellers don't have to offer much discount. 

We receive the monthly owner statements from AppFolio (and every other PM software) and manually "translate" those into QBO via a JE.

I’m a few years out of college and working as a software engineer in Indianapolis.

Any recommendations on software or systems to use for one rental? 

But once your property is ready to be listed, find a good property management software that has all the features you need - Listing Syndication, Tenant Screening, Lease Signing, Rent Collection, etc; and you should be able to have a much better work-life balance.

@Jay Levy We use our property management software, Innago, to manage the entire screening process.

I appreciated that their pricing packages were customizable to what you need as a combination of their PM software, maintenance coordination, leasing services, and/or delinquency assistance.

I think that your best bet is to offer the Holder of the Contract for deed some sort of discount if they refinanced out of the contract for deed so you could get your equity, short of that I don't think you have a lot of options.