Julian Weisser
About Julian Weisser
Julian Weisser is a co-founder of On Deck, the founder community and fellowship program (ODF) that says it has launched more than 1,000 startups. His LinkedIn headline describes his current work as helping more people start startups through Solo Founders and ODF. He is based in San Francisco.
He is the founder and CEO of Solo Founders, a program for people starting companies on their own. NFX Signal lists him as an investor at Other Ventures since 2020 and as an On Deck co-founder and partner since 2018. Crunchbase lists him as Head of Recruiting and Co-Founder at On Deck and CEO at Solo Founders. He also hosts the Texts with Founders podcast, which covers fundraising topics such as investors who ghost founders.
On Deck's own podcast page from 2023 describes him as an angel investor with over a hundred angel investments, naming Loyal, Level and Atmos. Crunchbase and NFX Signal each record 15 investments on their profiles, so public databases cover only part of what he has said he has done.
On that podcast he discussed fundraising and venture capital in 2023, including why profitability and revenue matter more to investors, and funding models such as those of Zapier and Bubble that prioritize revenue over heavy venture funding.
The Lounge deals desk lists Julian Weisser in the Supermemory pre-seed round of $3M, dated 2026-06. NFX Signal also lists Supermemory as a $3M pre-seed, dated Oct 2025, with Joshua Browder of Wander as a co-investor. The two sources give different dates. NFX also shows Supermemory in the Solo Founders Program S25 and lists him as the first supporter of MagicSchool AI. NFX ranks him under AI at Seed and Series A.
NFX Signal lists an investment range of $100K to $10M and a sweet spot of $1M. These figures are self-reported on a third-party profile, not a statement from Weisser. The same profile ranks him for AI (Seed and Series A), Enterprise (Series A) and San Francisco Bay Area Enterprise (Seed). His public work centers on early-stage and solo founders. His personal site is weisser.io.
- Supermemory: AI memory company; $3M pre-seed round, listed as Oct 2025 on NFX Signal and 2026-06 on the Lounge deals desk.
- MagicSchool AI: AI company; NFX Signal lists him as first supporter. Year not public.
- Loyal: named by On Deck as one of his angel investments. Year not public.
- Level: named by On Deck as one of his angel investments. Year not public.
- Atmos: named by On Deck as one of his angel investments. Year not public.
- ValueBase: Crunchbase lists him as a seed round investor. Year not confirmed.
Investing activity
Julian Weisser appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Pre-seed, with a median round size of $3M. The most recent is Supermemory (Pre-seed, $3M, Jun 2026).
Julian Weisser most often invests alongside Susa Ventures, Dane Knecht, Browder Capital and Theo Browne, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Julian Weisser
Does Julian Weisser invest in AI startups?
Yes. He is listed in the Supermemory $3M pre-seed round, and NFX Signal ranks him under AI at Seed and Series A. He has also been listed as first supporter of MagicSchool AI.
What check size does Julian Weisser write?
He has not stated a check size publicly that we could find. His NFX Signal profile lists a range of $100K to $10M with a $1M sweet spot, which is self-reported on a third-party site.
What is Julian Weisser's background?
He co-founded On Deck, the founder community behind the ODF fellowship, and founded Solo Founders. He is also an investor at Other Ventures per NFX Signal.
What stage does Julian Weisser invest in?
His public record shows pre-seed and seed investments, and NFX Signal ranks him for Seed and Series A in AI. His Supermemory deal was a pre-seed.
Where is Julian Weisser based?
He is based in San Francisco, California, according to LinkedIn, Crunchbase and NFX Signal.
Does Julian Weisser back solo founders?
He runs Solo Founders, a program for people starting companies alone, and he lists the Solo Founders Program S25 on NFX Signal alongside Supermemory. This suggests he is open to solo founders, though he has not published an investing rule about it.
Is Julian Weisser an angel investor?
Yes. Julian Weisser invests personally as an angel.
What AI companies has Julian Weisser invested in?
Julian Weisser's AI investments include Supermemory. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Julian Weisser invest at?
In the rounds tracked on Lounge, Julian Weisser has invested at Pre-seed, with a median round of $3M.
Who does Julian Weisser co-invest with?
Julian Weisser's most frequent co-investors on Lounge are Susa Ventures (1 deal), Dane Knecht (1 deal), Browder Capital (1 deal), Theo Browne (1 deal) and David Cramer (1 deal).