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Sebastian Barrios

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2025-06-08
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2025-06-08
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  1. “People like the honesty. They might not like it in the very short term or in the medium term sometimes even. But my experience has been if you're coming from a place of honesty, again, if you're sort of like not insulting anyone or kind of like crossing a line where things feel personal, people appreciate the feedback. People like growing people, if you have your performance review and everything comes back positive, what are you going to do with that? I was like, well, he's doing great. Everything's perfect. Thank you for being a part of the company. Oh, like what could I be doing better? What's not working? It's also a skill to separate that from your person. Now we do have situations where I've had to have conversations on like, well, you got this strong feedback, but it's on the product, you know, like maybe on the vision that we are pursuing or on the execution.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  2. “Even like meetings or whatnot, or else, but later, yes, but later, and they actually mean no. I think there, Argentina and other countries, but Argentina where the company was founded is an exception to that, where people are very direct. I will tell my boss if he's wrong. It's something that I love about the company. And we've been able to sort of like export that and also select for people that will actually behave in that way. But yes, we're extremely direct, extremely candid, we're honest about what's working, what's not working. And it's a learning that every manager or leader goes through. It's like, well, I want to hurt people's feelings, you know, I want to be friends with everyone. I think we all start on that path. And eventually you realize that”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  3. “It's a great book, and the concept is also great. I would even say it's even more important in Latin America, in some Asian countries where you have a culture and I'm Latin American, so I can talk a little bit about stereotypes without becoming offensive, especially ones that are true, where there's a lot of hierarchy. And I'm not going to tell my boss that he's wrong. We're just going to do this because he said so or she said so. This is the way it works. And this is the way it's always been done. So that's the way we're going to do it. I don't want to stand out. No, these are sort of like. cultural stereotypes that we are extremely aware of when we operate. People are extremely polite in Latin America as well. I don't know if you've traveled. Everyone will smile at you. It will be very hard for someone to say no to something.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  4. “What messages they're sending to the rest of the company. They participate in the product reviews. They are very aware, at least of all a big features that we launch. And the feedback is direct and clear.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  5. “That you send are extremely powerful. And who has what title, who gets promoted, who doesn't get promoted, who is getting what praise in public, what announcements are made on new products? How do we talk about things that didn't work? One very clear one is like, okay, this didn't work. And yes, we like risk with the person that let the project was fired. It's like, well, then you're not sort of like living what you have on your website. So I think it's not more complicated than that. You need to live it. You need to show it. And you also need to have people that will take in that culture and also propagate it into their teams. That's also the way it scales in the organization. But it definitely starts with the top management of the company and again, what they are focused on.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  6. “I think that question is even more on how does culture work at any company, especially at ours. No, it's very clear that it's not what you write on the walls or what you put on your website from what I've learned and what we've seen. It's what you do. It's what the leadership team is doing is how I get my performance reviews, how I get either praise or not praise in public, what are the acceptable errors, what are the not acceptable errors. Because again, if we have a system outage, it's obviously unacceptable. Like that's not the kind of error that we're going for. We're going for, well, you took a risk and a very bold vision, and it turns out it was not the right path. You're not going to get penalized for that. You might even get a promotion and those messages.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  7. “Yeah, maybe you could say you have to be the best eventually if you want to have that flywheel running. It's hard to start and be the best and the biggest when you're just getting started. But I think just knowing that there's great talent everywhere and that it is possible to attract them without being in a specific tech hub, maybe even empowering note. So like, okay, I want to start a company here. I think we can also be honest that it will be harder. It is easier to recruit and build a team where you're in a place where the high density is all over. Another thing that happens to us is But if you actually get that flywheel going, it becomes into a clear advantage”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  8. “But you are the only top company. And I'm exaggerating a bit, right? They're great companies throughout the world and in Latin America. And you have unicorns and there are outliers. But the truth is you're setting your own path and you're setting your own map and setting your own destination and you're building things that have not been built before in a different way. It's very fun, that's for sure.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  9. “Think it applies to many things, and you often also hear like, well, you're not in the Bay Area, you're not in the pinnacle of in the capital of technology. So how can you build amazing technology? There are advantages as well. I think you would find the same with, you mentioned a bunch of companies that have experienced that where, okay, if you can be the top in the region where there's great talent by statistical definition, there's great talent everywhere. It probably follows a parabolistic distribution. So it's everywhere. A lot of it does flow into the US, and it's absolutely true that there's a very high concentration of talent outside specific companies. I think that's probably one thing you don't get outside of the big tech hubs where you are the top company.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  10. “We like competition, especially when you're competing with sort of like the top of the top, and it pushes you to be better as well”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  11. “Yeah, some of them are automated changes as well. But yeah, we have a very high speed of execution. Yeah, it's quite fun to be around something that's changing that rapidly and that dramatically. We, again, have many different businesses, many different competitors in different businesses who operate at world class, whether it's finance, whether it's e-commerce. I would even say Brazil is probably one of the most competitive markets on the planet for e-commerce. You have local players, you have international players, you have players from Asia that are even funded by video game revenue and profits. So it's a great dynamic market to be around.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  12. “PPRs, deploy changes, changes to a system. It can be configuration changes. It can be database updates or whatever. Things that change, so there's no way anyone can check what those 30,000 changes are doing.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  13. “You can't check absolutely everything when you have 18,000 people. So to give you another crazy statistic, we do around 30,000 deployments per day of like changes to production.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  14. “We don't do anything magical there. We do a lot of design reviews. I think it's a term that they would probably use or product reviews in the US where it's like, okay, this is what we're working on. This is what it looks like. This is what all the pieces together are doing and working or not working. And they're the leadership team is extremely candid and honest on their feedback. Always cordial and happy work environment, but definitely on the side of being honest about what's working, what's not working, whether the vision was mistaken as well. There were many times where we've thought this was the right direction. Turns out it's not and we can pivot very quickly into a new thing. So no big secrets. Oh, just maybe the only secret is”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  15. “We like to observe users more than talk to users. No, you always hear talk to users, listen to users, they're going to tell you what they want, what they need. That works sometimes. We've seen that what works best is just to observe them, whether that's literally like user research sessions and just seeing what people are doing with the product. I'm sure this has happened to you and to many people that listen to your show and you cringe at all the assumptions that are being crushed before your eyes as someone types in their email and their name in the same field because your field said email comma name also you could either have the email or the username and people say oh i'll write both because that's what they're asking of me so a lot of examples like this where observing users is uh extremely valuable i think those are the ones that come to mind”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  16. “And there's another tricky aspect of this because life is trade offs, but as we say, okay, let's be very distributed on what the teams are going to be working on. Then you can end up with a product that has great parts. But once you put them all together, it's horrible and it sucks. People don't like it. So you also need a mix of, okay, this is a holistic vision. This is what we want to accomplish. This is what probably the end product is going to look like. And then you can build the features. And there's no like one rule that basically applies to all projects. There are times where you can have more freedom. There are times where you do require.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  17. “There's going to be tight feedback loops on that to also make sure everyone's pointing in the same direction, but you can't sort of like be telling 18,000 people exactly what they should be working on every day and expect that to work. So there's a fun combination of what can you delegate, what can you not delegate. We're also, I think, very hands-on wherever we can be. So we can't be on every single detail. But in the projects that we feel are most important, the whole leadership team goes extremely deep into working with the team, understanding what the restrictions are, what's working, what's not working, and pushing the team forward. I think that's probably the main one. We also talked about putting users before revenue. I think that's another big one that we've liked.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  18. “Very high level objectives on where we want the company to be, and they're not even that long term. It's not like we have a 10-year plan and I think in a market that's changing so much, even before AI, this is an extremely competitive market with very dynamic regulations in multiple countries. So it's hard to say like, okay, this is a plan for 10 years and these are the OKRs. And now everyone go into your teams and implement the specific features that are going to point to that. The way we run it is these are the objectives. These are maybe some of the new businesses or areas where we would like to explore. But everything else is up to teams. We just skate the main vision for the company is going. And there's a lot of another cliche freedom and responsibility saying like, okay, do whatever literally whatever you think is best for our users, for the company, for what we want to accomplish.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  19. “One big one, it's a cliche, but it's true the fear of failure. We actually empower our teams to make mistakes. Like no one's going to get fired for releasing something that didn't work in the sense that maybe the market was not ready or we had the wrong idea on where how to implement. Obviously, there's a lot less tolerance for, okay, bad quality, and it failed because the product wasn't good or is going offline or those kinds of failures are much less tolerated. But we do encourage our teams to take a lot of risks on what we should actually be working on. We also let them be very independent. I think it goes hand in hand. So, for example, we don't operate with OKRs where everything just trickles down into what every team is supposed to do.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  20. “Exactly. And if you extend it a little more, you could even reach a point where UIs and apps are sort of entirely generated. These are like all the things that you can do inside Mercalibre. You can buy stuff. You can get a credit card. You can move money around and then have a completely personalized UI for user predicting what are you going to do next and just having that as a main screen. Maybe you have like other screens, obviously, that allow you to do everything. But it's an exciting future. I think we're going to see a lot more automated UI.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  21. “A fun one where the prompt or what you actually want the product to do is everything you tell the system. We came up with ways to use our existing code. So it's not like there's no code in any of what I'm talking about, but we basically can extract the functionality of every single one of our microservices. And then we can have agents build and use different parts of different services and create new features for users end-to-end with a UI. So that's something that is still experimental, obviously, but it's happening and it's just going to accelerate as the models get better. So we literally have things that are taking existing code. So it's not like code doesn't exist, but you don't have to write any new code. There's a lot of functionality that we already have on the platform. And you can combine different parts of it and turn it into a”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  22. “I would say we're taking it even further. We always like to think in terms of platforms. It's one of the reasons why we've been able to scale the team so much. We have a great internal developer platform that takes care of a lot of scaling, security, building, testing, compliance. So developers and teams can just focus on adding value. And we're taking the same approach with AI. We developed an internal platform called Verdi that basically abstracts away a lot of the complexities around, okay, where are you going to get data? How's it going to be authorized? And that in itself has been evolving as a models become more capable. Now you can have more agents, agentic frameworks, things taking action, taking over longer tasks. And we're seeing great results with skipping code entirely. I think it's.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  23. “Great question because you probably always hear it from the other side. Now people who are more product oriented are not going to need engineers as much. So for us, the change is accelerating what people can do on both sides. I don't think there's any competition. And again, we don't see a line between product and engineering as strongly as other companies. So I'm extremely happy when someone who's more product oriented.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  24. “The buses, the trucks, the planes, the distribution centers into routing for picking items within the distribution centers, risk, content moderation, search, robotics, there's really long list of really fun initiatives that we're working on. They're all very technical and turn into value for our users.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  25. “Other companies know it might not be the case, but my understanding is anytime it's okay, how much revenue can we get from this new feature or what's the metric that's going to move for Marcos, our CEO? The first question is always, okay, how's the user going to experience this? Show me the flow, show me the user experience. Are they understanding it? Show me the metrics that people are actually liking what we're doing. putting the users before the revenue obviously turns into revenue in the future in the long term, which is what you're looking for. So again, I think the top-down version of that, maintaining the culture and being able to select for the top of the top talent in a whole region, in multiple countries, I think it's what's allowed that to happen. And the business, as you said, there's a lot of technology, right? Like you need to do the routing for all.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  26. “Yeah, I think it's also a top down thing where a lot of the leadership is very technical. They're very into the product. They're also very into the business, into the numbers, into the details. It's amazing to be on the C-level meetings and the kind of questions, the kind of level of attention. I know founder mode is now like a term that's there, but the company has been operating like that for a while. Discussions will even go as deep as, okay, we're using that copy. That's way too many words. It's not clear, hey, why is this pixel here where we could use that space for something a lot more useful? And these are literally conversations at the C level, asking, okay, how does this work for users when you present a feature? And here I'm going to stereotype.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  27. “The details, there's not a lot of tolerance for being in a meeting and getting asked the questions like, well, I need to check with this person to understand the details because I'm not sure what technology we're using. That would not fly. So there is a bias towards the tech side of it. And then once you're inside Mercalibre, you will probably get to know you a lot more and it'll be very clear if you have the product inclination or if you should be more comfortable just with the engineering.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  28. “This works because you want to be as close to the problem as possible, and that probably works being as close to the technology as possible, being as close to the users as possible. You can have it with two different people that have to interact and coordinate. And that obviously works as well, right? Like I'm not saying this is the only way to do it. Clearly, there are a lot more examples. Maybe we are actually the exception and it would be hard to replicate anywhere else. But if you're able to have that whole context in a single mind, in a single person that can then deliver that vision to the team, I think it leads to great products that users are going to love and enjoy. In terms of hiring, we do, in the interview process, sort of like test for product skills, but we mainly do test for engineering skills. I think it's worth being honest about like we have a strong bias for engineering, for being technical, for being deep in.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  29. “So I think it's less than 1000. I think that would make 5%. In other companies, maybe you have 10, 20, 30 percent, even more, other companies.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  30. “Me and for Medical Libre, it's hard to separate where sort of like engineering stops and product begins. We do have a small product organization. There are people in Medical Libre that have the product manager title, but the ratio is much smaller than any other tech company that you would think of. And the way we think about it is like that, we're not going to determine who's going to own the product just based on the title. It's going to be based on who's the best for that role. And then it turns out that for us in the majority of the cases, it's the engineering leaders, it's the tech leads, it's the people that can understand what's technically possible. And they're also good about, okay, what are the business needs? What are the user needs? What are the users doing? How am I going to measure that? And combine that into a single role.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  31. “It's a large company. We don't focus on the stock price. That much, but yes, 100 billion, even more so now depends on how the market's feeling and what the global news are. But yes, one of the top valued companies on the planet, we have around 100 million users, customers, sellers, people interacting in the platform. And as you mentioned, one of the larger engineering and product building teams on the planet.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  32. “That's right. There's a lot of operations that need to happen for all those packages to be delivered. You asked about some fun statistics, specifically with deliveries we deliver over 5 million packages per day or items. So you visit most of Latin America. We have some very cool visualizations where if you track the routes of our trucks and delivery vans and whatnot, you sort of like paint a picture of Latin America, which is pretty fun. We obviously operate in major cities, but we have very, very large capillarity and reach all the different corners of Latin America.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  33. “Happy to, happy to. So you can think of us as a completely vertically integrated e-commerce marketplace. Oh, that means buying and selling any product you can think of and the vertically integrated part means we have our own distribution network, we have our own airplanes, we have our own trucks, we have to do all the technology and coordination behind that. or in addition to that we also have a very large fintech operation the the two sides of the business are actually almost the same size so we also offer accounts we offer credit cards we offer loans all of that sort of like integrated with each other into what we call an ecosystem”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  34. “Is the right number 18,000 and climbing? I just would specify that they don't report all directly to me. We can talk about how the company is structured. But yes, I lead the technology team that basically powers all of what they do.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  35. “We were raised in a very intensely independent way. My mother mainly, the analogy that she used is that she wanted to train us like spies. She would drop us in the middle of the city, Mexico City. I would be like, you have to get back home. You have to know public transit or ask someone for help. And basically solve problems. Just go and get things done.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  36. “It's hard to separate where engineering stops and product begins, and we don't feel like just having a title should determine who was the owner.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  37. “It absolutely exploded. I actually got contacted by a lot of different companies like multinationals, governments, saying like, well, you have the number one app. We want you to build an app for us.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source

  38. “Day I'm walking in the street and I get a phone and a blocked number. I was super young, by the way, at the time. I think I was like 16. Pick up. I said, well, high fashion. This is Steve from Apple. I need to talk to you about your app. We're not going to be able to have it on the App Store. I actually pushed back a little bit. I told I read all the rules of the App Store. He told me, check again because we just added a new rule.”

    2025-06-08 · Lenny's Podcast · How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios · IDENTIFIED FROM THE TRANSCRIPT · source