
JJ Fliegelman
Startup founder, advisor, investor, and armchair linguist
New York, NY
Joined May 2025
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Summary
JJ Fliegelman is a serial entrepreneur and investor with a strong background in technology, having co-founded WayUp (formerly Campus Job), a leading DEI recruiting platform that raised over $40 million and was recognized by CNN. He is currently building First Harmonic and actively invests in early-stage startups, particularly through Y Combinator Demo Day funds. x+3
He is deeply integrated into the Y Combinator ecosystem, first as a successful alumnus (W15 batch) with WayUp, then as a Visiting Group Partner (2022-2023), and now as a prolific investor leading multiple Demo Day funds. His article 'Your company is not 'too far along' for YC' highlights his commitment to fostering startup growth and sharing his insights. ycombinator+2
Fliegelman possesses a unique blend of technical and business acumen, starting as a self-taught programmer with a background in International Studies and Economics from the University of Pennsylvania, followed by experience as a consultant at McKinsey & Company. This diverse foundation allowed him to effectively lead the technical development as CTO of WayUp and contribute to its strategic growth. ycombinator+2
Beyond his professional pursuits, JJ is an avid linguist and traveler, demonstrating a keen interest in languages (proficient in English, Spanish, Hebrew, Catalan, French, and German) and experiencing diverse cultures through backpacking. He also enjoys unique hobbies like cooking with a flamethrower and appreciating both gourmet and budget-friendly coffee and pizza. x+3
Work
Education
Projects
Hobbies
Enjoys languages and linguistics, is a self-proclaimed armchair linguist, and is proficient in multiple languages including Spanish, Hebrew, Catalan, French, and German. x+2
Enjoys cooking with his flamethrower, fancy coffee, and decidedly unfancy $1 pizza. ycombinator
Has a passion for travel, having backpacked in 16 countries and identifies as a travel addict. x+2
Actively involved in building new ventures, as indicated by his current engagement with First Harmonic and past roles as a founder and CTO. x
Notes
MTMichael Tansaid
JFJJ Fliegelman
is one of the most respected investors they've worked with at venture funds.Mar 16, 2026
MTMichael Tansaid
JFJJ Fliegelman
is one of the most supportive hiring managers or business owners they know for 17-year-olds starting out.Feb 23, 2026
RARaghav Arorasaid
JFJJ Fliegelman
is one of the most impressive software engineers they've worked with who previously founded or worked at a YC startup.Dec 18, 2025
MTMichael Tansaid
JFJJ Fliegelman
is one of the most effective ex-YC founders they've seen at growing and engaging communities.Dec 12, 2025
Jul 28, 2025
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