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I’m a freelance Digital Marketing & Performance specialist based in Zürich, with 16+ years of hands-on experience in paid media, performance analytics, and marketing technology. I specialize in Google Tag Manager and GA4, including consent mode and enhanced conversions, so teams can rely on accurate full-funnel tracking and performance reporting for smarter decisions. I enjoy turning complex tracking setups into clear, trustworthy insights—auditing GTM/GA4 configurations, resolving conversion tracking discrepancies, and supporting Smart Bidding with reliable data. Over my career I’ve planned, managed, and optimized multi-channel campaigns across Google Ads, Meta Ads, TikTok, Snapchat, and Search, improving efficiency and conversion rates through structured testing, KPI analysis, and strong stakeholder communication.…I’m a freelance Digital Marketing & Performance specialist based in Zürich, with 16+ years of hands-on experience in paid media, performance analytics, and marketing technology. I specialize in Google Tag Manager and GA4, including consent mode and enhanced conversions, so teams can rely on accurate full-funnel tracking and performance reporting for smarter decisions. I enjoy turning complex tracking setups into clear, trustworthy insights—auditing GTM/GA4 configurations, resolving conversion tracking discrepancies, and supporting Smart Bidding with reliable data. Over my career I’ve planned, managed, and optimized multi-channel campaigns across Google Ads, Meta Ads, TikTok, Snapchat, and Search, improving efficiency and conversion rates through structured testing, KPI analysis, and strong stakeholder communication.

Tereza Cerna

Digital Marketer, Performance Marketer, Marketing Analyst, +2

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I’m a freelance Digital Marketing & Performance specialist based in Zürich, with 16+ years of hands-on experience in paid media, performance analytics, and marketing technology. I specialize in Google Tag Manager and GA4, including consent mode and enhanced conversions, so teams can rely on accurate full-funnel tracking and performance reporting for smarter decisions. I enjoy turning complex tracking setups into clear, trustworthy insights—auditing GTM/GA4 configurations, resolving conversion tracking discrepancies, and supporting Smart Bidding with reliable data. Over my career I’ve planned, managed, and optimized multi-channel campaigns across Google Ads, Meta Ads, TikTok, Snapchat, and Search, improving efficiency and conversion rates through structured testing, KPI analysis, and strong stakeholder communication.…I’m a freelance Digital Marketing & Performance specialist based in Zürich, with 16+ years of hands-on experience in paid media, performance analytics, and marketing technology. I specialize in Google Tag Manager and GA4, including consent mode and enhanced conversions, so teams can rely on accurate full-funnel tracking and performance reporting for smarter decisions. I enjoy turning complex tracking setups into clear, trustworthy insights—auditing GTM/GA4 configurations, resolving conversion tracking discrepancies, and supporting Smart Bidding with reliable data. Over my career I’ve planned, managed, and optimized multi-channel campaigns across Google Ads, Meta Ads, TikTok, Snapchat, and Search, improving efficiency and conversion rates through structured testing, KPI analysis, and strong stakeholder communication.

Available to hire

I’m a freelance Digital Marketing & Performance specialist based in Zürich, with 16+ years of hands-on experience in paid media, performance analytics, and marketing technology. I specialize in Google Tag Manager and GA4, including consent mode and enhanced conversions, so teams can rely on accurate full-funnel tracking and performance reporting for smarter decisions.

I enjoy turning complex tracking setups into clear, trustworthy insights—auditing GTM/GA4 configurations, resolving conversion tracking discrepancies, and supporting Smart Bidding with reliable data. Over my career I’ve planned, managed, and optimized multi-channel campaigns across Google Ads, Meta Ads, TikTok, Snapchat, and Search, improving efficiency and conversion rates through structured testing, KPI analysis, and strong stakeholder communication.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Czech

Fluent

Slovak

Fluent

German

Advanced

French

Beginner

Work Experience

Digital Marketing & Performance Manager at Cognito Schools

May 1, 2026 - Present

Coordinated end-to-end tracking and analytics setups with external developers and technical partners, auditing GTM containers and GA4 configurations to ensure accurate attribution across the full funnel. Built and maintained performance dashboards, ensuring consistent data quality and reporting governance, and communicated insights and recommendations to management. Planned, managed, and optimized paid social campaigns across Meta Ads and Google Ads with budget ownership and regular plan-vs-actual reviews to maintain continuous spend control. Analyzed campaign KPIs (CPM, CTR, CPA, conversion rate) to find optimization opportunities and support management decisions. Created and maintained audience-oriented social content aligned with internal and external stakeholders, and deployed AI tools to improve audience development and reporting workflows.

Digital Growth Marketing Manager at Nicole Curtin – Project Engagement at eBay (DE/UK)

October 1, 2025 - May 1, 2026

Developed and implemented measurement frameworks based on multi-touch attribution and Google Analytics 4, ensuring reporting governance, data quality, and on-time delivery across international multi-country campaigns (DE/UK). Managed GTM configurations and GA4 event tracking to maintain accurate conversion data and support Smart Bidding strategies across a $20M+ annual budget. Conducted A/B and multivariate testing on creatives and funnel elements, reducing CAC by 85% and improving conversion rate. Built MarTech solutions for tracking, conversion optimization, and feed management to improve campaign and attribution quality. Planned, managed, and optimized audience-oriented campaigns across Meta Ads, TikTok Ads, Snapchat Ads, DV360, and Search, generating $200M in incremental revenue through structured budget planning and KPI forecasting. Proactively advised and supported internal teams and external partners on digital work experience marketing activities and communication requests.

Freelance Marketing Consultant

August 1, 2025 - January 1, 2026

Designed and delivered full-funnel performance marketing strategies for clients in real estate and e-commerce via Google Ads, Meta Ads Manager, and LinkedIn Ads, including conversion tracking setup and troubleshooting. Analyzed and reported campaign KPIs (CPM, CTR, CPC, CPA, conversion rate) for data-driven optimization and transparent client communication.

Digital Project Manager & Digital Consultant at HOY & Mediaschneider

May 1, 2019 - October 1, 2022

Advised Swiss clients strategically on digital communications and developed regulatory-compliant campaigns aligned with digital media strategies. Led cross-functional teams with a process-optimization focus, achieving 20% faster project delivery.

Junior Digital Media Consultant at Wavemaker

May 1, 2017 - February 1, 2019

Developed and planned digital media strategies for agency clients within one of the world’s leading media agency networks.

Brand Manager & Project Manager at BURDA International

September 1, 2009 - March 1, 2016

Achieved 33% monthly revenue growth through data-driven brand and marketing strategies with precise audience targeting. Doubled social media user base within 6 months through targeted content and growth initiatives.