The Chispa Day — now booking founding clients

Building at 11pm since 2018

Your business runs on systems.
I build them for you.In one day.

I spent 8 years in FinTech building systems that process $5.2T+ in assets. Now I build AI systems for women-run businesses. I spend one day inside yours, build what handles your content, your clients, and your follow-up, then teach you to run it all yourself. In English o en español.

Yesenia M. Perez — Lead Software Engineer, educator, and founder of Build con Chispa
currently building$5.2T+
$5.2T+in Assets Managed
8+Yrs Engineering
Q1 '25Perf. Excellence Winner
3Kids at Home
11pmBuild Time
Two ways in

Done for you. Or learn it with me.

You can hire me to build your AI systems in one day — or start free in the community and build them yourself. Same systems, same me, different speed.

Done for you

The Chispa Day

I embed in your business for one day and build the systems myself — you watch every step, ask everything, and walk away owning all of it. No code to learn, no developer to hire.

  • AI trained on your voice — content that sounds like you
  • Client intake, onboarding, and follow-up that run without you
  • A weekly AI routine built around your actual schedule
  • Everything documented so you can run it solo
See how it works →
Learn it with me

Build con Chispa + the Courses

Not ready to hand it off? Start free in the community, then grab the challenge or a kit when you want to go deeper. You build it yourself — I show you my screen the whole way.

  • Free community — weekly prompts and live Q&As
  • Sound Like You: train AI to write in your voice
  • Instant-download kits for one specific problem each
  • Ask in English o en español — you'll get me in both
See the courses →
the actual tools

I only build what
I run myself.

Every system I set up in a client's business runs in mine first — my content, my scheduling, this site. Claude is how I build. I'm just showing you the session.

See how a Chispa Day works →
claude — yessie/brand-sprint
$claude "write my brand positioning"

Reading your about page and voice...
Analyzing background and audience...

✦ Here's what makes you different:

“Finance-grade systems thinking +
 AI fluency + Latina identity =
 a category of one.”

# refine for your sales page?

$
what I actually believe· · ·
“You don't need a CS degree or perfect timing. You need someone who's actually doing it to show you what works.”

I dropped out. Went back. Got my CS degree while bartending and pregnant with my second kid. First engineering job at 28. Lead Engineer from there. I have three kids and I code after they're asleep. I'm not teaching theory. I'm showing you what's on my screen right now.

· · ·Read my story →
The community

Build con Chispa.
Free, and actually helpful.

A free community for women using AI to run their business — not learn to code, actually run it. Come ask the questions you've been Googling with no luck. Spanglish welcome — ask in English o en español and you'll get me in both.

Free to joinWeekly AI promptsLive Q&AsSpanglish welcomeBeginners welcome
Join for free →
Free
Always
En/Es
Spanglish OK
Live
Weekly Q&A

Work with me

The Chispa Day · AI workspace setup · consulting

See services →

For employers

8+ yrs · Lead Engineer · FinTech · 2× Perf. Excellence