Skip to content
Lenny's PodcastLenny's Podcast

Sebastian Barrios: How 18k engineers deploy 30k times a day

At Mercadolibre the engineering leadership runs product strategy: about 1,000 PMs work alongside 18,000 engineers shipping 30,000 deploys per day.

Lenny RachitskyhostSebastian Barriosguest
Jun 7, 20251h 19mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

Inside MercadoLibre: Engineering-Driven Culture Behind Latin America’s $100B Giant

  1. Sebastián Barrios, former head of product and engineering at MercadoLibre and now SVP of Engineering at Roblox, explains how MercadoLibre scaled to 18,000 engineers, 30,000 daily deploys, and five million daily deliveries across Latin America.
  2. The company runs with an unusually engineering-led product model, minimal PM headcount, high autonomy, and intense user focus, all while embracing risk and rapid experimentation at massive scale.
  3. Sebas also shares personal stories—from a teenage app that prompted a direct call from Steve Jobs to a childhood “spy training” upbringing—that shaped his bias for agency, independence, and deep technical curiosity.
  4. Throughout, he describes how MercadoLibre resists hype cycles, pragmatically adopts AI, and builds a culture of radical candor, user obsession, and high ownership.

IDEAS WORTH REMEMBERING

5 ideas

Collapse the wall between product and engineering to speed learning and ownership.

MercadoLibre has ~18,000 engineers but <1,000 PMs; technical leaders often own both the “what” and the “how,” which keeps decisions close to the technology and the user, and reduces coordination overhead.

Use high-level objectives instead of rigid OKR cascades at large scale.

Rather than dictating detailed roadmaps to thousands of engineers, leadership sets broad, near-term company goals and trusts teams to decide how to get there, with frequent product/design reviews to course-correct.

Encourage risk on vision, not on quality or reliability.

Teams are explicitly not punished for bold bets that don’t land; they are held to a high standard on stability and craftsmanship, but are rewarded for ambitious product ideas—even failed ones.

Observe users more than you ask them what they want.

MercadoLibre relies heavily on watching real behavior (usability tests, in-product metrics) rather than over-indexing on what users say in interviews, which often exposes incorrect assumptions and hidden friction.

Make candor a lived behavior, not a poster value.

Culture is shaped by who gets promoted, what behavior is praised, and how feedback is delivered in product reviews; leaders are direct and detailed about what’s working or not, while separating criticism of work from criticism of people.

WORDS WORTH SAVING

5 quotes

For me and for MercadoLibre, it’s hard to separate where engineering stops and product begins.

— Sebastián Barrios

We’re not going to determine who owns the product based on the title; it’s based on who’s best for that role.

— Sebastián Barrios

No one’s going to get fired for releasing something that didn’t work. You might even get a promotion.

— Sebastián Barrios

We like to observe users more than talk to users.

— Sebastián Barrios

Life and the world are malleable. You can change a lot more than you think.

— Sebastián Barrios

MercadoLibre’s scale, business model, and engineering organizationEngineering-led product development and minimal use of PMsCulture of autonomy, risk-taking, and radical candorPragmatic adoption of AI and internal agentic platformsOperating without heavy OKRs and aligning 18,000 engineersSebas’s personal habits, media diet, and focus/curiosity practicesFormative life experiences: Steve Jobs call, early apps, and “spy” upbringing

High quality AI-generated summary created from speaker-labeled transcript.

Get more out of YouTube videos.

High quality summaries for YouTube videos. Accurate transcripts to search & find moments. Powered by ChatGPT & Claude AI.

Add to Chrome