Independent editorial profile
Startup founder and Y Combinator Partner Emeritus
Michael Seibel co-founded Justin.tv and Socialcam and spent more than a decade advising early-stage founders through Y Combinator.
BuildOS listens to Michael because his fundraising advice comes from both sides of the exchange: building venture-backed startups and reviewing, interviewing, and advising founders at Y Combinator. His cold-investor-email guidance is used only for the outreach skill’s investor mode, where short factual context and a reply-first ask are more appropriate than a sales cadence.
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A skill for planning, drafting, auditing, and rewriting cold outreach. Distilled from seven cold-email source analyses into one playbook for high-volume campaigns, strategic accounts, single-target relationship outreach, reply revival, investor fundraising, founder-led outreach, recruiting, PR, partnerships, and customer research.