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I am a data-driven digital marketing professional with over a decade of experience specializing in analytics, attribution, and measurement in high-volume, regulated environments. I translate marketing execution into reliable data, clean reporting, and actionable insights, helping teams optimize budgets and performance across multi-channel campaigns. My strengths include designing scalable tracking frameworks, owning GA4 & GTM implementations, and guiding cookie deprecation and consent-related changes. I thrive in cross-functional environments and enjoy turning complex data into clear, business-ready dashboards and recommendations.…I am a data-driven digital marketing professional with over a decade of experience specializing in analytics, attribution, and measurement in high-volume, regulated environments. I translate marketing execution into reliable data, clean reporting, and actionable insights, helping teams optimize budgets and performance across multi-channel campaigns. My strengths include designing scalable tracking frameworks, owning GA4 & GTM implementations, and guiding cookie deprecation and consent-related changes. I thrive in cross-functional environments and enjoy turning complex data into clear, business-ready dashboards and recommendations.

ERATOSTHENIS KOSTARAS

Marketing Analyst, Performance Marketer, Data Analyst, +2

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I am a data-driven digital marketing professional with over a decade of experience specializing in analytics, attribution, and measurement in high-volume, regulated environments. I translate marketing execution into reliable data, clean reporting, and actionable insights, helping teams optimize budgets and performance across multi-channel campaigns. My strengths include designing scalable tracking frameworks, owning GA4 & GTM implementations, and guiding cookie deprecation and consent-related changes. I thrive in cross-functional environments and enjoy turning complex data into clear, business-ready dashboards and recommendations.…I am a data-driven digital marketing professional with over a decade of experience specializing in analytics, attribution, and measurement in high-volume, regulated environments. I translate marketing execution into reliable data, clean reporting, and actionable insights, helping teams optimize budgets and performance across multi-channel campaigns. My strengths include designing scalable tracking frameworks, owning GA4 & GTM implementations, and guiding cookie deprecation and consent-related changes. I thrive in cross-functional environments and enjoy turning complex data into clear, business-ready dashboards and recommendations.

Available to hire

I am a data-driven digital marketing professional with over a decade of experience specializing in analytics, attribution, and measurement in high-volume, regulated environments. I translate marketing execution into reliable data, clean reporting, and actionable insights, helping teams optimize budgets and performance across multi-channel campaigns.

My strengths include designing scalable tracking frameworks, owning GA4 & GTM implementations, and guiding cookie deprecation and consent-related changes. I thrive in cross-functional environments and enjoy turning complex data into clear, business-ready dashboards and recommendations.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Greek, Modern

Fluent

Work Experience

Digital Data Analyst at XM

October 1, 2022 - Present

Analytics and measurement support for multi-channel paid acquisition in a high-volume, regulated fintech environment. Owned GA4 and Google Tag Manager implementations for key acquisition funnels, improving tracking accuracy and attribution across Criteo and Yahoo Ads. Built and maintained reporting frameworks used by performance and marketing stakeholders and guided cookie deprecation and consent-related tracking changes.

Paid Advertising Manager & Marketing Analyst at PeoplePerHour

June 1, 2019 - September 1, 2022

Managed and optimized paid acquisition across Google Ads and paid social for a global marketplace. Owned Google Analytics and Google Tag Manager to ensure accurate attribution and measurement. Analyzed campaign performance and user behavior to guide optimization and budget allocation. Designed reporting frameworks and KPI benchmarks for marketing and leadership teams. Improved attribution accuracy and performance visibility through standardized analytics practices.

Marketing Consultant / Performance Marketing Manager at Generation Y

October 1, 2017 - May 1, 2019

Planned and executed paid media strategies across Google Ads and paid social channels. Set up and maintained Google Analytics for campaign measurement and reporting. Analyzed performance data to optimize targeting, creatives, and budgets. Defined KPIs and evaluated ROI across campaigns and clients.

Co-Owner & Freelance Digital Marketer at YES Internet

February 1, 2011 - September 1, 2017

Led end-to-end digital marketing activities across performance channels, analytics, and reporting. Managed budgets, optimization, and performance targets for multiple client accounts. Implemented analytics setups to measure ROI and campaign effectiveness. Built long-term client relationships as primary point of contact.

Co-Founder & Business Development at Donorwiz

February 1, 2011 - October 1, 2017

Co-founded an early-stage digital fundraising startup; led business development, partner relationships, and early client acquisition. Owned initial marketing efforts across paid campaigns and outreach.