Operator First.
Mentor Always.
Anti-Agency by Design.
I’ve spent 19 years helping brands scale profitably on Amazon and beyond, from launching on the brand side to founding a leading agency, and now advising brands directly through Ajarro.
Brett Lemker
Seasoned e-commerce operator and strategist with 19 years of hands-on experience helping brands grow profitably across Amazon, Walmart, and DTC channels.
He began his career at an organic beverage company in Boulder, CO, where he launched and managed its Amazon Seller Central account shortly after the platform expanded beyond books transforming it into the company’s #1 sales channel for eight consecutive years.
Brett later joined Beekeeper Marketing as one of the early team members and Seller Central subject-matter experts, supporting major brands through its acquisition by Advantage Solutions.
As Founder & CEO of optiAMZ, Brett built one of the leading Amazon agencies in the U.S., managing over $200M in annual revenue and $17M in advertising spend for brands ranging from emerging startups to Fortune 500 portfolios with 17 employees.
Blending hands-on operating experience with rigorous, data-driven analysis, he helps brands strengthen their presence, maximize sales, and unlock sustainable profitability on Amazon and beyond.
Today, through Ajarro, Brett partners directly with brands, founders, investors, and leadership teams to drive measurable, profit-first growth. His model replaces the traditional agency structure with ethnically precision-built strategy, transparent analytics, and mentorship-driven execution.
Brands advised
300+
Revenue managed
$500m
Years of experience
19
my principles
These principles shape every engagement: simple, measurable, and profit-driven.
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Margin before vanity metrics — every lever ties to contribution profit.
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You see the why behind every decision. No hidden markups or retainers.
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Forecasts, not fluff. Decisions backed by data and experience.
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I don’t just do the work — I transfer the playbooks so your team can own it.
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No retainers. No lock-ins. Just accountability tied to measurable outcomes.
The Anti-Agency MODEL
Why This Model Works
Agencies too often put brands on autopilot. Ajarro is the opposite: direct access to a senior operator who ties every decision to contribution margin and sustainable profit. No layers. No retainers. No spin.
No layers. No lock-ins. Just results that compound.
No retainers. No bloat. Just results that compound.
Let’s Talk About Profitable Growth
No retainers. No bloat. Just measurable progress tied to profit.
