Yaroslav Lehenchuk.
Founder & CEO of O-CMO, practicing Fractional CMO, and AI operator. 15+ years in B2B tech marketing. Ukrainian, based in Lisbon.
Marketer first, founder second.
I'm a practicing Fractional CMO with 15+ years in B2B tech marketing — SaaS, IT outsourcing, fintech, healthtech, professional services. I work directly with founders and CEOs to build marketing systems that generate pipeline, not activity.
I've run engagements with 30+ tech companies across the EU, US, and AU, and led teams of 30+ people. I still take client work — running a marketplace of fractional CMOs without practicing the craft would be strange.
Four chapters, one thread: senior ownership.
Every company I've worked with had marketing activity. Almost none had a senior owner for it. Everything I've built follows from that observation.
B2B tech marketing
15+ years in-house and agency-side across SaaS and IT services — from hands-on channels to marketing leadership.
Fractional practice
Went fractional to fix the ownership gap directly: GTM strategy, team hiring, and pipeline for tech companies at $1M–$30M ARR.
O-CMO — 2023
Founded O-CMO after watching companies hire marketing leaders blind. Every CMO reference-checked, public pricing, account management after the match. 300+ vetted leaders, 5/5 on Clutch.
Octocrew — 2026
Founded Octocrew — managed AI coworker crews deployed into a company's existing tools. Senior strategy needs execution capacity; AI agents provide it.
Hiring a CMO shouldn’t be a gamble.
Over 110,000 people now put “fractional” in their LinkedIn title — up from 2,000 in 2022. Verification didn't keep up: companies hire from cold outreach and hope. O-CMO removes the gamble — every marketing leader is reference-checked by former clients and peers before they reach you. I reviewed the first hundred applications myself, and I still personally review the edge cases.
Where to find me.
LinkedIn →
Daily posts on go-to-market for tech founders. The fastest way to reach me.
Medium →
Long-form on fractional marketing, GTM strategy, and marketplace building.
CMO profile →
My verified profile in the O-CMO catalog — industries, track record, availability.
Email →
team@o-cmo.com — for partnerships, press, and everything else.