William Nazarethian
Senior Account Manager & Customer Success Manager
Fourteen years growing B2B revenue on international portfolios, four of them in London.
Ad serving and programmatic on the media side, enterprise platforms on the SaaS side, and cloud, connectivity and cybersecurity since 2025. The work barely changes from one to the next: onboarding, adoption, retention, renewals, upsell and cross-sell.
Based in Paris. I run my portfolios in English.
Retention & renewals
27 of 30 accounts renewed
Onboarding & adoption
150 client users trained
Certifications and continuous learning
Master’s in Management from ESC Clermont. Bachelor’s in Econometrics and Management from Paris Nanterre University.
Partner sales certifications with Veeam, VMware and Microsoft. Platform certifications across Google Ads, Google DV360, The Trade Desk, LinkedIn Ads and TikTok Ads. Multi-channel media trading with AdLearn Media, and the full French property diagnostics cycle awarded by Bureau Veritas Certification.
Account management and customer success, end to end
Which sectors do I work in?
AdTech and media platforms from 2011 to 2024. Ad serving at Sizmek, search-intent programmatic at NANO Interactive, media planning and billing workflows at FreeWheel, cross-channel advertising at Perion. Since 2025, B2B SaaS, cloud infrastructure, connectivity and cybersecurity.
What does the role cover?
The whole client lifecycle. Onboarding, platform adoption, training the client teams, executive QBRs, contract renewal, upsell and cross-sell, churn prevention, pipeline and forecasting.
Which accounts and brands?
International portfolios of 25 to 150 accounts. Agency groups including Dentsu Aegis, Havas, Publicis and GroupM. Brands including SNCF, Samsung, UEFA, Longchamp and Marks & Spencer.
Which tools?
Salesforce, HubSpot, Intercom, Zendesk, Brevo, Sales Navigator, Power BI, Datorama, Google Analytics, Excel and VBA, Jira. Plus an AI content pipeline I built on the Claude API and MCP for digiconquest.com.
Which languages?
French and Armenian are my native languages. My English comes from four years working in London and a decade of international portfolios run in English after that.
Brands and agencies
Let's talk
Happy to talk about account management, customer success or client partnership roles in AdTech, B2B SaaS and cloud. Paris, remote or international.