Aaron Vega
Founder & CEO
Ex-owner of Vega Heating & Air. Still keeps a multimeter in his backpack.
Built by people who’ve owned trucks.
Fieldstack started in a 1,200-square-foot HVAC shop in Modesto, California. We weren’t a tech company that decided to serve trades. We were a trade business that got fed up and built better tools. Then realized other owners wanted them too.
Aaron Vega, founder & CEO · photographed at his old shop in Modesto, July 2024.
The founder story
I ran a 9-truck HVAC shop. I built the software I needed.
In 2014 I bought a tired HVAC company in Modesto from my father-in-law. Nine trucks, twelve techs, and a service manager who knew everything but kept it all in her head. The first month I owned it I lost $14,000 because we missed two install deposits and a tech wrote down the wrong serial number on a warranty claim.
We tried ServiceTitan. Too expensive and too complicated. The implementation team made my office manager cry. We tried Jobber. Built for lawn care; it didn’t understand maintenance plans or equipment history. We tried Housecall Pro. Felt like a generic CRM with a pretty logo.
So I hired a developer my brother knew. We built our own dispatch board on nights and weekends. Then a mobile app for the techs. Then a billing module. By 2019 my shop was doing $4.2M a year on software no one else had ever seen. Two other HVAC owners in the valley asked if they could buy a copy. That was Fieldstack’s first sale.
Five years later we’re used by 1,400+ shops across North America. I sold the HVAC business in 2022 to focus on this full time. But every single feature we ship still has to pass one test: would I have actually used it when I was running trucks?
Aaron Vega
Founder & CEO
What we believe
Three rules. We say no to anything that breaks them.
i.
Plain English wins.
If a 58-year-old service tech can’t figure it out without a training video, we redesign it. No jargon, no acronyms, no “quick tip” bubbles. The dispatch board says “drag a call onto a tech.” That’s the entire onboarding.
ii.
Built for the truck, not the conference room.
We test every screen on a contractor-grade Android in direct sunlight, with gloves on, while standing in a customer’s side yard. If it doesn’t work there, it doesn’t ship. No matter how clean the Figma file looked.
iii.
Your data is yours.
Full export, anytime, no questions. No “talk to your account manager.” No data hostage games. If we’re not earning the renewal, we deserve to lose it. Sleeping easier means knowing you can walk.
The team
38 people in three states. 14 of them have wired a thermostat.
We hire for two qualities first: shop sense and craft. Engineers who respect that a tech’s phone screen is the most important UI in the company. Support folks who can talk Trane SEER ratings without Googling.
Priya Kalra
Co-founder & CTO
Built the first dispatch board in her brother’s garage in 2017. Stripe and Square before that.
Marcus O’Donnell
Head of Product
15 years as a service manager at a Sacramento HVAC shop. Speaks fluent NATE.
Deja Carmichael
VP, Customer Success
Onboards every shop herself for the first 90 days. Used to run a 3-truck shop in Atlanta.
Sam Liang
Engineering Lead, Mobile
Obsessed with offline-first sync. Has tested the crew app from inside a Costco walk-in freezer.
Reyes Hidalgo
Implementation Manager
Has migrated 600+ shops off ServiceTitan, Jobber, and pen-and-paper. Yes, pen-and-paper.
Jamie Moss
Designer
Spent four years designing dashboards at Square. Now designs them for a 58-year-old tech in gloves.
…and 30 more
Engineering, support, sales
Spread across Sacramento, Austin, and remote. Three of us are former Trane techs.
Customer ride-along · summer ’24
We sit on every install we ship
The company today
Eight years in. Still owner-operated.
1,400+
HVAC & plumbing shops
Active customers, across 41 US states and 4 Canadian provinces
$2.1B
In job revenue tracked
Processed through the platform in 2025 alone
96%
Annual retention
The other 4% mostly retired or sold the business
38
People on the team
14 with trade backgrounds. Three former service managers
Open roles
Come build the next 1,400 shops.
We’re hiring across engineering, design, support, and field sales. Fully remote roles available. Bonus points if you’ve ever wired a contactor or billed a customer through QuickBooks at 11pm.
Same demo, same 20 minutes. Same person who’s worked in your shoes.
Now you know who built it. Let’s show you what your week looks like on it.