Mentee Testimony
"Leon pitches us like a co-founder, not a distant advisor, opens doors to political leaders, and replies at 11 pm with feedback on urgent decks. His advice is never generic; it’s precise, immediate, situational, and feels like having a brilliant extra founder on the team."
Anne Greul
About
Leon Szeli is building a new startup after founding AI sizing company Presize and working in product management at Meta.
Co-Founder and Investment Committee Member, CDTM Venture Capital
Leon Szeli is an AI entrepreneur building a new startup in stealth. He previously founded and led Presize, which developed AI-based size recommendations for online fashion shopping. Meta acquired the company in 2022, after which Szeli worked in product management on Meta’s commerce products until June 2026.
Szeli also co-founded CDTM Venture Capital and serves on its investment committee. The fund backs early-stage founders connected to the Center for Digital Technology and Management. He invests through Szeli Ventures as well. His experience combines building an AI product, navigating an acquisition, managing commerce products and evaluating early-stage investments.
Experience Leon brings to founders
- AI products
- E-commerce technology
- Product management
- Early-stage investing
- Fundraising
Operating and investing experience
A selection of companies and roles connected to Leon Szeli.
Ventures
Presize
Former founding CEO
CDTM Venture Capital
Co-founder and investment committee member
Meta
Former product manager
Highlights
- Founded Presize, which Meta acquired in 2022.
- Co-founded CDTM Venture Capital.
- Worked on commerce products at Meta.
Questionsfounders ask aboutLeon Szeli
Who is Leon Szeli?
Leon Szeli is building a new startup after founding AI sizing company Presize and working in product management at Meta.
What experience does Leon Szeli bring to mentoring?
Their experience spans AI products, e-commerce technology, product management, early-stage investing and fundraising.
The best founder mentors
are founders themselves.
Know someone who belongs in the EWOR Fellowship?
Nominate a founder