Stefano Mazzei speaking during a performance marketing event

    STEFANO
    MAZZEI

    Paid Ads and performance creative for DTC ecommerce brands.

    $52M+
    Paid Media Managed
    5.2x
    Average Meta ROAS
    +43%
    Yearly Average Revenue Growth
    150+
    Performance Brands Through Cosma

    Trusted by DTC brands across markets

    Judith & Charles logo
    Campo Grande logo
    King Ranch Saddle Shop logo
    Pew Pew Tactical logo
    Collars & Co. logo
    Campo Grande logo

    ABOUT

    I'M STEFANO.

    I’m a Performance Marketer focused on Paid Acquisition for DTC eCommerce Brands.

    My work covers both Paid Ads and Performance Creative. I spend most of my time figuring out what’s happening inside an account, where the next dollar should go, and what we need to test next. Then I use the data to shape better ads and creatives.

    Over time, I stopped seeing media buying and creative as separate jobs. Scaling a brand takes more than campaign management. You need to understand the customer, test ideas, and let the results inform what gets made next.

    That approach led me to co-found Cosma with my business partner, Cristiano Costanzi. We built the team so media buying and creative could work side by side. Performance data helps us decide what to test and what to create next.

    Today, I mainly work with DTC eCommerce Brands in the US and Canada on paid acquisition and creative strategy. I also help them think through growth more broadly.

    Stefano Mazzei portrait

    EXPERTISE

    WHERE I CREATE LEVERAGE.

    01

    META ADS

    Strategy, testing, optimization and scaling for DTC ecommerce.

    Account structure, purchase optimization, budget allocation, creative testing and performance analysis — with the goal of making the account easier to understand and easier to scale.

    • Campaign Strategy
    • Account Structure
    • Testing
    • Budget Allocation
    • Scaling
    • Optimization
    • Attribution
    • Performance Analysis
    02

    PERFORMANCE CREATIVE

    Turning customer insight and performance data into better ads.

    Hooks, angles, UGC, static ads, video concepts and creative iterations built around what the account is actually telling us.

    • Creative Research
    • Hooks
    • Angles
    • UGC
    • Statics
    • Video Ads
    • Creative Testing
    • Iteration
    • Messaging
    03

    DTC GROWTH

    Looking beyond Ads Manager when the ad account isn't the real problem.

    New customer acquisition, landing pages, offer, conversion rate, attribution and unit economics — the variables that ultimately determine how far paid media can scale.

    • New Customer Acquisition
    • Offer
    • Landing Page
    • Funnel
    • Conversion Rate
    • Attribution
    • Unit Economics
    • MER / CAC

    SELECTED WORK

    RESULTS, NOT JUST CAMPAIGNS.

    Judith & Charles performance results
    JUDITH & CHARLESPremium Women's Fashion · Canada

    From 3.5x to 9.49x Meta ROAS average.

    My Role

    Lead Strategist · Meta Ads · Account Strategy

    The Challenge

    A strong brand and product catalog, but an account that wasn't structured around the conversion signal that mattered most: purchases.

    The Approach

    I led the strategy to rebuild the Meta account around purchase optimization, catalog campaigns and structured product testing — simplifying the setup and giving the platform better signals to work with.

    9.49x
    Meta ROAS Average
    16.59x
    Google ROAS Average
    $1.72M
    Revenue Generated (Meta + Google)
    View Case Study
    BFyne performance results
    BFYNESwim & Resort Wear · USA

    Same budget. More than 2x monthly revenue.

    My Role

    Lead Strategist · Meta Ads · Creative Strategy

    The Challenge

    Revenue had plateaued around $50K/month. The account was fragmented, CPMs were rising and creative testing wasn't consistent enough to create the next wave of growth.

    The Approach

    We restructured the account, introduced consistent weekly creative testing across UGC, video and static assets, and built a more deliberate launch strategy around product collections.

    $50K → $110K
    Monthly Revenue
    +59%
    Sales Growth
    3.54x
    Average ROAS
    View Case Study
    Giorgio Cookie Co. performance results
    GIORGIO COOKIE CO.Food & Beverage · USA

    Great retention. Not enough new customers.

    My Role

    Lead Strategist · Meta Ads · Creative Testing

    The Challenge

    The product had strong repeat behavior, but almost half of the customer base consisted of returning customers. The growth constraint was new customer acquisition.

    The Approach

    We restructured Meta around new-customer acquisition, introduced better exclusions and systematic testing, and developed a creative mix across testimonial, social-proof and product-focused concepts.

    +71%
    New Customer Acquisition (Q1→Q2)
    +58.7%
    Total Sales Growth
    3x
    CTR vs Market Benchmark
    View Case Study

    AT A GLANCE

    SOME NUMBERS I'M PROUD OF.

    $XXM+
    Paid Media Managed
    X.Xx
    Average Meta ROAS
    +XX%
    Average Revenue Growth
    87+
    Performance Brands Through Cosma

    PERFORMANCE CREATIVE

    ADS I'VE WORKED ON.

    Creative isn't decoration. It's one of the biggest variables in paid acquisition.

    HOW I THINK

    MEDIA BUYING CAN'T FIX BAD CREATIVE.

    01

    CREATIVE IS A PERFORMANCE VARIABLE.

    The quality of what goes into the account matters more than endless campaign complexity.

    02

    TEST IDEAS, NOT RANDOM VARIABLES.

    Creative testing should answer questions and create learnings, not just produce more ads.

    03

    SCALE WHEN PERFORMANCE EARNS IT.

    Scaling is the consequence of a system that works — not a button you press.

    04

    MEDIA AND CREATIVE SHOULD NEVER LIVE IN SILOS.

    Performance data should continuously influence the next generation of creative.

    COSMA DIGITAL

    I ALSO CO-FOUNDED COSMA DIGITAL.

    Cosma is the performance marketing agency I co-founded around the same principles I use in my own work: paid media, creative and measurement should operate as one system. Today, the team works with DTC ecommerce brands across paid acquisition and performance creative, while I remain closely involved in strategy, advertising and creative direction.

    Meta AdsGoogle AdsPerformance CreativeDTC Ecommerce
    Cosma Digital team or workspace

    EXPERIENCE

    THE JOURNEY SO FAR.

    —

    Started in paid advertising

    First hands-on work managing paid social campaigns.

    —

    Specialized in ecommerce

    Shifted focus to DTC and performance-driven growth.

    —

    First major DTC brands

    Took on scaling engagements with established ecommerce brands.

    —

    Co-founded Cosma Digital

    Built the agency around media buying, creative and experimentation.

    —

    Scaling DTC brands

    Helping DTC brands scale through paid media and creative.

    Scaling DTC brands — CAREER_MILESTONE_05_YEAR

    WATCH

    WHAT I'VE BEEN TALKING ABOUT.

    Meta Ads, performance creative, ecommerce growth and everything I'm learning along the way.

    FROM THE PEOPLE I'VE WORKED WITH

    WHAT CLIENTS SAY.

    “[CLIENT TESTIMONIAL PLACEHOLDER]”
    Name Surname
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    Founder, Brand
    “[CLIENT TESTIMONIAL PLACEHOLDER]”
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    Head of Growth, Brand
    “[CLIENT TESTIMONIAL PLACEHOLDER]”
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    CMO, Brand
    “[CLIENT TESTIMONIAL PLACEHOLDER]”
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    Founder, Brand

    ARTICLES

    THINGS I THINK ABOUT.

    Stefano Mazzei working

    LET'S TALK

    WANT TO WORK TOGETHER?

    If you're building a DTC brand and want better performance from paid acquisition and creative, let's talk.