Independent editorial profile

Steli Efti

Co-founder and CEO of Close and startup-sales educator

Steli Efti co-founded Close and publishes practical teaching about startup sales, outbound, follow-up, objections, leadership, and founder-led growth.

Startup salesSales follow-upObjection handlingSales leadership

Why BuildOS listens

BuildOS listens to Steli because his sales teaching focuses on what happens after an initial ask: objections, silence, follow-up, and the smallest next response. The reviewed source directly informs the reply-revival mode in Engagement-First Outreach. We use that narrow process without importing every sales opinion or treating company results as independent evidence.

Editorial standard

Inclusion means BuildOS reviewed useful public material and can trace specific processes back to it. It does not mean the person reviewed, approved, or endorses the resulting skill.

Skills informed by this work

BuildOS currently traces 1 reviewed source across 1 published skill.

1 reviewed source

Cold Email Engagement-First Outreach

A source-lineaged root combo skill for planning, drafting, auditing, and rewriting cold outreach. Distilled from seven cold-email source analyses into one master playbook for high-volume campaigns, strategic accounts, single-target relationship outreach, reply revival, investor fundraising, founder-led outreach, recruiting, PR, partnerships, and customer research.

Material BuildOS reviewed

Used in Cold Email Engagement-First Outreach

Get 457% more replies to your sales emails with the 1, 2, 3 hack

By Steli Efti

Work and background

Co-founder and CEO

Co-founded a CRM platform built for sales-focused small and midsize businesses.

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Startup sales education

Publishes long-running practical guidance about outbound, follow-up, objection handling, hiring, and sales management.

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Y Combinator founder

Close identifies Steli as a Y Combinator alumnus who advises startup founders and sales teams.

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Founder sales guides

Authors public guides and books on startup sales, negotiation, demos, pipelines, and sales hiring.

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Profile sources

Close author profile Official biography, writing archive, current role, and portrait source. Close sales resources Primary collection of the company’s public sales guides and teaching. Reviewed video Primary source reviewed for the reply-revival mode. Founder sales guide First-party long-form sales teaching from Steli and Close.

Last reviewed 2026-07-10. Self-reported audience metrics are labeled in context.