Founder · Certified Leadz LLC

I'm not a marketer who found AI. I'm an operator who got tired of the software.

Xavier Medina — second-generation contractor, 20+ years in the trades, and the builder behind Certified AI™.

Watch first: 60 seconds on what we build and why.
The short version

I grew up in this.

My father was a contractor. I'm the second generation. More than twenty years in the field, over 500 roofs installed across seven states, and five years running projects as lead project manager for a national roofing brand before I went out on my own.

Then I started Certified Contracting — a licensed Arizona general contractor, ROC #364621 — and ran into the wall every owner hits. You can do the work. You cannot do the work, answer the phone, chase the money and hire three people in the same week. Something always drops.

So I started building. A recruiting pipeline that texted applicants in seconds instead of days. A follow-up sequence that worked leads I'd already written off. A proposal generator that turned measurements into a branded, multi-option proposal before I left the driveway. Invoice automation so material cost stopped being a surprise at month end.

None of it came off a shelf, because nothing on the shelf fit how a sales-led company actually runs. It got built out of necessity and tested with my own money on the line.

Certified Leadz exists because other owners kept asking me to build them the same thing. Today we build those systems with AI where it genuinely helps — and we're building our own operating system, Certified AI, on the same rules we install for clients.

From the video

Key points

  • Certified Leadz started inside Certified Contracting, Xavier's licensed Arizona general contracting company.
  • The systems were built out of necessity: hiring, follow-up, proposals and paperwork were eating the owner's week.
  • Clients own what gets built — accounts, data and systems stay in their name.
How I work

What you get from an operator that you don't get from an agency

I know what your day looks like

I've been on the roof at 5 a.m. and in the truck at 9 p.m. writing proposals. When you say follow-up isn't happening, I know why.

Tested on my own companies first

Every system we install was built inside a company I run, with my money funding the mistakes. The case studies show the lessons.

You own what we build

Your accounts, your data, your system. If you want to run it yourself in six months, you can.

I'll tell you no

If what you need isn't what we build — or AI shouldn't touch it — I'll say so on the first call.

Systems built

What I've built

  • AI Lead Response

    SMS follow-up and re-engagement run in our own businesses. The automatic AI voice callback is in development and is not live yet.

  • AI Recruiting Engine

    Applicant intake and screening run live for Certified Contracting. Outbound messaging is waiting on Meta app review and carrier SMS registration.

  • Outbound Prospecting Engine

    Running for Certified Leadz's own outbound calling. Every call is placed by a person.

  • Sales Call Intelligence

    Built into our internal sales tooling and tested; not yet running on live client calls. Real-time, during-the-call coaching is a concept, not a feature.

  • Proposal Automation

    The proposal and quote generators were built for Certified Contracting. The proposal-to-signature-to-payment flow in Certified AI runs on staging.

  • Invoice-to-Job Automation

    Built for Certified Contracting's JobNimbus account. Matching rules are specific to each company's suppliers and job naming.

  • AI Receptionist

    In development for Certified Leadz's own line. Not live yet — we'll change this label when it is answering real calls.

  • Conversion Website

    This site is one. Earlier contractor lead pages were built the same way.

Case studies

Builds, with the lessons included

Built in-houseBeta: In limited use; expect changes.

AI Recruiting Engine for a Door-to-Door Roofing Sales Team

Replacing a Make.com texter with a purpose-built screening and booking system for commission roofing sales reps — applicants screened with evidence, interviews booked without phone tag, hires approved by the owner.

Built in-houseBeta: In limited use; expect changes.

Building Certified AI: One Operating System for Our Own Company

Consolidating prospecting, sales, proposals, payments and AI-assisted software building into one governed system with human approval on every consequential action — built on our own company first.

Built in-houseLive: Running in production for a real business today.

Re-Engaging Cold Homeowner Conversations Without Losing the Personal Touch

Turning years of cold text threads — missed inspections, unanswered proposals, past clients — into a paced, owner-approved re-engagement program that sends from the owner's own number, inside the original thread.

Writing

Articles by Xavier

Business Process Automation·

What Should a Roofing Company Automate First?

A roofer's order of operations for automation: lead response, estimate follow-up, proposals, recruiting and invoices — and what should stay human.

Founder Notes·

What AI Should Not Automate in a Sales Business

Where AI belongs in a sales process and where it doesn't: the decisions we keep human in every system we build, and the rule we use to tell the difference.

Media & profiles

Find Xavier elsewhere

For podcasts, interviews or speaking, use the form below and choose “Podcast / media”.

Talk to Xavier directly

Twenty minutes, owner to owner. You'll talk to me, not a setter reading a script.

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