About
It started on my wife's laptop, in 2023.
KeyFlow started in November 2023 as a set of scripts on my wife's laptop. She is a real estate agent in Ohio, she was coordinating transactions for another agent on top of her own, and too much of her week was going into work that was not selling real estate. Three rebuilds later it is this, and it has carried well over a hundred real closings.
The sentence this is built on
Meralis says something about her clients that turned out to describe the software as well:
People are not scared of buying a home. They are scared of not understanding it.
We learned that from the other side first. Seven years of renting, a relocation to Cincinnati, and in June 2016 a first house we had been qualified to buy long before we felt able to. The obstacle was never the money. It was that every answer changed depending on who we asked.
Meralis spent five years in banking, got licensed in 2020, and came to real estate wanting to be the resource we had needed. I followed in December 2024.
The same sentence describes what goes wrong on the agent's side of the table. An agent is not scared of their cap. They are scared of not being able to see it. Not scared of a deadline, but of not knowing which ones just moved. Not scared of the commission math, but of a number that changed and did not say so.
Everything here is one version or another of that.
Where it came from
I am Lester Marcano, an electrical engineer with about two decades of writing software behind me, and a licensed agent. Meralis Marcano, my wife, has been selling real estate since 2020. For a long time my involvement in her business was carrying boxes and proofreading flyers.
Then I started paying attention to where her time actually went. Not the showings, not the negotiating, not the parts of the job she is good at and enjoys. The other hours. Re-deriving deadlines after a closing moved. Rebuilding a commission estimate in a spreadsheet because the last one no longer matched. Answering the same three questions from the same client for the third time that week.
She was also coordinating transactions for two other agents, on top of her own.
None of it was difficult. All of it was necessary, and all of it was the kind of work that expands to fill whatever evening is available.
Three versions, over three years
The first version, in November 2023, was not a product. It was a set of scripts that ran on Meralis's laptop and nowhere else, doing the specific things she did by hand. Useful, and completely untransferable.
In February 2025 the second version moved inside a Gmail add-on, because that is where the work actually happened. Closer to the job, and still bounded by somebody else's product.
What exists today began in October 2025, rebuilt properly. By then the requirements were not guesses. They were two years of watching which parts kept breaking.
In December 2024, between the first version and the second, I got a real estate license myself. The order matters: the first version was built for somebody else, from watching. Both rebuilds came after I had my own files in it, my own deadlines to miss, and my own commission to be wrong about.
What it actually changed
The part I did not expect is the part worth telling.
The goal was to give Meralis her evenings back, and it did that. But it also let her take on more business. Coordinating for two other agents while running her own book stopped being the ceiling it had been, because the work that used to expand to fill an evening now took minutes.
Capacity, not just relief. That was not the plan, and it is the reason I kept building.
How it was tested
Over a hundred real closings have run through KeyFlow, including deals Meralis coordinated for two other agents. Real clients, real money, real deadlines, on our own files, for nearly three years before it was offered to anybody.
That is a strength and a limit at once. It means the product models the job correctly for two agents in one market, and it means a team lead in a different state, with a different contract and a different brokerage model, will find things it assumes. Those are the things we do not know yet.
Underneath, every change is checked against an automated test suite before it reaches anyone's account. That matters for one specific reason: commission math that silently changes is far worse than commission math that visibly breaks. A number that quietly becomes a different number is a number you cannot trust again.
About the numbers on this site
Every screenshot is a capture of the running application loaded with a fictional book of business, so no real client's file appears anywhere on this site. Every one carries a note saying so.
The hundred-plus closings are ours and the ones Meralis coordinated for two other agents. We would rather tell you exactly where a figure comes from than round it up.
What we believe about your data
An agent's production history, client list, and commission records are the record of a career. In most tools that record lives in an account somebody else controls, and it ends when the affiliation does.
In KeyFlow you are the account holder. The workspace is yours, and everything in it exports to a spreadsheet from a button in Settings without asking anyone. That is the reason the product exists rather than a feature added to it.