MainDevs

AI-native business operating systems

Stop stitching together tools that don’t talk to each other.

Most growing businesses run on six or seven disconnected tools — a CRM here, a spreadsheet there, none of it talking. We build your business’s operating system: one custom-fit platform that replaces the patchwork — with AI working inside it, doing the fetching, typing and chasing your team does by hand today.

Six tools. No single source of truth.

Every connection below is a manual export, a copy-paste, or a person remembering to do something.

Fig. 01 — Stack topologyBefore / After

Before — point to point

QuickBooksHubSpotSlackSpreadsheetsEmail threads9 more SaaS

Nothing agrees. The numbers in one tool contradict the numbers in the next, and two of the links broke months ago without anyone noticing.

After — one foundation

MAINDEVS OSQuickBooksHubSpotSlackSpreadsheetsEmail threads9 more SaaS

One layer underneath everything. Your tools keep doing what they do well — the operating system holds the truth and moves the work between them.

You keep what works. We build the layer underneath.

No rip and replace. The operating system is the foundation your existing tools plug into.

  • Keep

    Whatever already works

    If QuickBooks is fine, QuickBooks stays. It just stops being an island.

  • Connect

    Everything else

    One number means one thing across the whole business, instead of three tools disagreeing about the same customer.

  • Automate

    What is still manual

    The exports, the re-keying, the Friday afternoon reconciliation. Handled by the system instead of a person.

The system does the work nobody has time for.

AI is not a feature bolted to the side. It is how the operating system moves work between your tools.

Reads what comes in
An email becomes a record
A client sends scope and dates in a paragraph. It lands as a job, on the right account, with the right contact. Nobody retypes it.
Drafts the paperwork
The invoice writes itself
Hours get approved and the invoice is already drafted against the right job, waiting for a person to look at it and send it.
Notices what stalled
Nothing goes quiet unseen
The proposal nobody followed up on, the invoice nobody chased, the job stuck between two people. It surfaces before it costs you.
Answers in plain English
Ask the system, not a person
“What did we bill Northwind last quarter?” No export, no pivot table, no waiting on whoever owns the spreadsheet.
Checks its own work
Month-end stops being a week
Reconciliation runs overnight. What lines up is closed. What does not is flagged for a human instead of quietly booked.

Where a person decides

Every one of these hands off to a human at the point where judgment matters. The system does the fetching, the typing and the chasing. It does not make the calls.

On our side of the wall, the same technology handles the repetitive engineering — which is why a system like this lands faster and costs less than a traditional shop with the same headcount.

How the work actually runs.

One team from scope to support, and a price agreed before anyone writes code.

  1. Step 01

    We map what you run on

    A working session through your real stack — what each tool holds, where work gets re-keyed by hand, and which of those handoffs is actually costing you money. You keep the map whether or not you hire us.

  2. Step 02

    A fixed first build, not a retainer

    A written scope: what gets built first, what it costs, and what it explicitly does not include. Agreed before anyone writes code — so if it is not worth it, this is the cheapest possible place to stop.

  3. Step 03

    You see it running on your own data

    Not a demo at the end. Something you can click, with your real records in it, while there is still budget and time to change direction. If we built the wrong thing, you find out in weeks, not quarters.

  4. Step 04

    The same team keeps it running

    The people who scoped it build it, and the people who built it support it. No handover to an account manager, no rotating bench, no ticket queue between you and whoever knows your system.

What this asks of you

A few hours in the first week, and one person who can answer questions and make decisions. That is genuinely it.

You already have a business to run. If your team ends up managing the project, we have not done our job — and the whole point of the system is to give those hours back, not spend more of them.

The three things buyers ask first.

We already use HubSpot and QuickBooks. Why would we need this?

You keep whatever is working. We are not asking you to rip and replace — what we build is the layer that connects everything and automates what is manual today. Think of it as the operating system your existing tools plug into, not a replacement for all of them.

How is this different from hiring a development agency?

Same senior-level output, delivered with agency-level service. We deliver faster and at a lower cost than a traditional shop with the same headcount, because a great deal of the repetitive engineering work is handled differently on our end.

Are you actually a US company?

Yes. We are a US company, we invoice in dollars, and we work the same hours you do — so you are not waiting overnight on answers. Our registered entity details are on the terms page.

Show us your stack. We’ll show you what one system looks like.

A 30-minute call. You walk us through the tools you run on; we tell you honestly what is worth connecting and what is not.