Jack Cook

Entrepreneurship

Things I've built and run, not just pitched.

Pest OS

Live · Paying customers getpestos.com →

An AI company running the full customer lifecycle for pest & wildlife operators, from the missed call to the booked job.

Most pest and wildlife control businesses are one or two people. They miss calls constantly while on job sites, and a missed call is a missed booking. Pest OS sits behind the operator's existing number. The owner still gets first crack at every call. If nobody answers after five rings, Pest OS picks up, triages the pest type and urgency, books the job to the operator's calendar, and emails a call summary.

Jack pitching Pest OS to a pest control company in a parking lot in New Hampshire
Pitching Pest OS in a parking lot in New Hampshire.

My co-founder Jacob Posner (Dartmouth '27) leads the technical architecture. I lead business development, outreach, operations, and sales. We met in Rome while studying abroad and incorporated when we got back to campus.

In spring 2026, we won the Magnuson Founder's Grant from Dartmouth's Center for Entrepreneurship, a competitive grant awarded to student ventures demonstrating real traction and a credible path to scale. The grant funds our next phase of customer acquisition and product development.

How a call flows through Pest OS

1
Customer calls
Rings operator's existing number
2
Owner gets first crack
5 rings before handoff
3
Pest OS picks up
Triages pest type & urgency
4
Job booked
Routed by location & job type, added to calendar

The real engineering is in the parts you never hear: spam screening, escalation logic, and routing that optimizes appointment times by location and job type.

First customer, live since April 2026

Our first customer, Estate Wildlife Control, is a two-operator wildlife company in New Hampshire that went live April 2, 2026. These numbers are from the last 30 days.

$43.2Kin 36 jobs booked or transferred: 18 booked directly by the AI, 18 closed by the operators after a warm transfer
$19.2Kfrom 16 after-hours calls the office would have missed
31callbacks queued for the operators
$2.4Kpeak single-day revenue captured

Early on, one call was mishandled by the AI. We caught it, told the operator, fixed the system, and repaired the relationship. An operator's phone line is their business, and we treat it that way.

Try it yourself

Call (608) 571-1212 and ask for a general demo. You'll be talking to the same AI that answers calls for our customers. See the full product at getpestos.com.

What I learned

We built first and iterated to our customer's needs, which I think was the right call. Roughly 1,000 cold emails generated interest but no signed customers. What actually worked was getting in front of people: leaning on my Dartmouth angle to get a conversation, starting with a small project to build trust, and proving the product before asking for a bigger commitment.

Pest OS taught me how to build rapport, and that face-to-face time is how you build it. It also taught me to take product validation and market research seriously: we sized the industry, talked to operators, and let a live customer shape what the product became.

Role
Co-founder, CEO
Since
January 2026
ARR
$6K
Market
$13.4B U.S. industry, 16,565 firms, 81% with one or two locations
Pricing
$500 setup + $500/mo
Burn
~$100/mo. First customer covers it 5x

GHC Partners

Venture Fund

LP outreach infrastructure, proprietary databases, and macro research for an emerging venture fund

As a venture analyst at GHC Partners, I built the fund's LP outreach infrastructure from scratch. Python scripts parsed and structured contact data from source PDFs. The Anthropic API personalized email drafts at scale. A Gmail integration delivered daily drafts to the managing partner's inbox. An Excel CRM, iterated through eight-plus versions, tracked contact status, outreach stage, and responses.

The system was designed to never auto-send. Every email required explicit partner approval before going out. The automation removed drafting time, not judgment.

LP outreach pipeline

1
Source PDFs
Parse & structure contacts
2
AI drafting
Personalized via Anthropic API
3
Partner review
Human approval on every send
4
CRM tracking
8+ iterations of Excel CRM

Beyond outreach

I spearheaded an alternative fundraising initiative, building three databases tracking PRIs, emerging manager programs, and donor-advised funds across 100+ potential LPs in the US and Northern Europe. I assisted on the fund's SBIC application, and my macroeconomic research has been included in three LP reports.

Role
VC Analyst
Since
May 2025
Scale
~700 LP contacts
Databases
3 proprietary (PRIs, emerging managers, DAFs)
Stack
Python, Anthropic API, Gmail MCP, Excel CRM
Constraint
Human approval on every send

Earlier builds

Arboro (TuckLAB, spring 2025). B2C reforestation platform. I led finance and business strategy. First place in the 6 Minute Pitch, Value Proposition, and Product Development challenges; third overall out of 16 teams.

The Gratefull Bed Company (2023–2025). I bought an ownership share of a small bed company specifically to learn small business management with real money on the line, and increased profitability each year I held it.

Pattern
Learn by owning the outcome

Next: the analytical work →