This profile has not been claimed and data may not be accurate.
Founder170
60th percentile
Investor0
YC W10Serial FounderAcquired2 ExitsRaised $50M+1,000+ EmployeesOn Wikipedia
Founder Matrix
Most Complimentary
Credibility
this founder typical founder (50th pct)
Domain Expertise · 98th percentile
- Wikidata entity Q19665536 exists for Dan Siroker, confirming public notability as an internet entrepreneur.
- Identified as a researcher on OpenAlex with an h-index of 1 and 151 citations across 4 works.
Founder score
- 99%Probability of being accurate (99%)Y Combinator W10 alum as co-founder of Optimizely (YC Winter 2010).
- 99%Probability of being accurate (99%)Exit: Optimizely acquired by Episerver in October 2020.
- 99%Probability of being accurate (99%)Named related person on SEC Form D filings for Rewind AI, Inc. (Limitless), confirming active founder/operator role.
- 99%Probability of being accurate (99%)Past co-founder of Optimizely, founded in 2009 and acquired by Episerver in October 2020.
- 97%Probability of being accurate (97%)Raised $50M per Optimizely's SEC Form D filing, the authoritative figure for capital raised.
- 97%Probability of being accurate (97%)Optimizely was co-founded with Pete Koomen, and Limitless was co-founded with Brett Bejcek.
- 95%Probability of being accurate (95%)Current Co-Founder and CEO of Limitless, an AI startup acquired by Meta in December 2025.
- 95%Probability of being accurate (95%)Exit: Limitless acquired by Meta in December 2025.
- 95%Probability of being accurate (95%)Active on Hacker News with 2,126 karma across posts and comments since 2008.
- 95%Probability of being accurate (95%)Confirmed Hacker News account @dsiroker with 2,126 karma, active since 2008.
- 92%Probability of being accurate (92%)Posted 56 stories on Hacker News, well above the 20-post threshold for active poster status.
- 90%Probability of being accurate (90%)Wikidata entity Q19665536 exists for Dan Siroker, confirming public notability as an internet entrepreneur.
- 90%Probability of being accurate (90%)GitHub account @dsiroker has been active for approximately 17 years, created in October 2008.
- 90%Probability of being accurate (90%)Top HN post 'A/B Testing You'll Actually Use: Optimizely (YC W10) Launches Out of Beta' received 249 points.
- 88%Probability of being accurate (88%)GitHub account @dsiroker is dormant with no public repo push activity detected.
- 85%Probability of being accurate (85%)GitHub account @dsiroker confirmed as Dan Siroker's account, active since 2008.
- 80%Probability of being accurate (80%)Optimizely's domain ranks #3,393 in the Majestic Million, a top-ranked web property.
- 70%Probability of being accurate (70%)LinkedIn (lnkd.in) ranks #454 in the Majestic Million, where Dan Siroker maintains a prominent public profile.
- 60%Probability of being accurate (60%)Identified as a researcher on OpenAlex with an h-index of 1 and 151 citations across 4 works.
Investor score
No signal on this dimension.
What you likely need
Dan Siroker is a serial founder with two notable exits — Optimizely (acquired by Episerver) and Limitless (acquired by Meta) — and a strong YC W10 pedigree. With Limitless now inside Meta, he is likely evaluating his next venture or considering a transition into investing or advising. His technical credibility, public profile, and network position him well for a high-impact next chapter.
Are these your current priorities?
We will tune and customize your Founder Festival experience to make sure you get invited to the events that would be most valuable to you.
- positioningLeverage your dual-exit founder story (Optimizely + Limitless) to position yourself as a repeat founder when pitching your next company — investors will fast-track diligence for proven operators.
- introsConsider formalizing an angel investing practice or micro-fund now that you have liquidity from two exits — your YC W10 network and Optimizely/Limitless brand make you a credible check-writer.
- tacticalReactivate your GitHub account (@dsiroker) with public repos or open-source projects — your account has been dormant and shipping public code would reinforce your technical founder credibility.
- positioningCapitalize on your 2,100+ HN karma and 56 posts by sharing lessons from the Limitless acquisition — a 'Show HN' or essay post from a just-acquired founder would likely hit the front page.
- fundraisingMind Emulation Foundation (YC W18) is still active — consider a public fundraising push or research partnership announcement to raise its profile while you have post-acquisition media attention.
- introsRe-engage the YC alumni network as a W10 founder with two exits — offering office hours or co-founder introductions to current batches would strengthen your deal flow and community standing.
- wellbeingAfter a company acquisition, founders often experience a 'founder's fog' — proactively schedule time to reflect on what energizes you before committing to your next full-time project.