Mike Krieger

• 1. Introduction

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  Michel Krieger was born on the 4th of March, 1986, in São Paulo, Brazil, and by the time he turned 32, he had helped build one of the most-used platforms on earth. In 2010, still fresh from Stanford University, Krieger co-founded Instagram with Kevin Systrom. By the time he resigned eight years later, the platform had grown from a few million users to one billion monthly active users. That number is hard to hold in the mind. It means roughly one in eight people alive at that moment were checking Instagram every month. What questions does that raise? How does a software engineer, coding alone through the night, build something that reaches a billion people? What does it cost to hand that creation over to Facebook, and keep building it under someone else's roof? And what do you do after?

• 2. Stanford and First Steps

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  Krieger moved from Brazil to California in 2004 to attend Stanford University, where he majored in symbolic systems, a discipline that sits at the intersection of computer science, linguistics, philosophy, and psychology. It was at Stanford that he crossed paths with Kevin Systrom. The two would eventually form one of the more durable partnerships in the technology industry, collaborating repeatedly across more than a decade. Before Instagram took the shape the world came to know, Krieger and Systrom originally planned to build a check-in app. The pivot to a photo-sharing platform proved decisive. Once the direction changed, Krieger took on the bulk of the engineering work himself. In the early days, most of Instagram's engineering and user experience were developed solely by him, a fact that shaped the product's DNA in ways that would take years to fully appreciate.

• 3. 3:30 AM and the Early Grind

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  Krieger later described one particular night that captures what building Instagram actually felt like in those early months. He woke up to an email saying the site had gone down. He asked his colleague Shane if he had fixed it. He asked Systrom. Neither had. When Krieger scrolled back through the terminal history to see what command had last been entered, the answer was startling: he himself had revived Instagram at 3:30 in the morning, apparently in a "completely drunken state," with no memory of doing it. That story, told in Krieger's own words, is not a boast. It is a description of how precarious the platform was, how thinly staffed, and how deeply its early team was living inside it. Krieger's phrase summed it up directly: "That's how much we were struggling in those days."

• 4. A Billion Users and a Departure

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  Facebook acquired Instagram, and Krieger stayed on as chief technology officer. His commitment, by his own account, was to building and growing Instagram independently within that larger structure. Over the years of his tenure, the user base expanded from a few million to one billion monthly active users. On the 24th of September, 2018, it was announced that Krieger had resigned and would be leaving in a few weeks. He did not announce a next move at the time. The departure closed an eight-year chapter that had begun in a small team scrambling through server emergencies at 3:30 in the morning and ended with one of the largest consumer platforms in the world.

• 5. Rt.live, Artifact, and What Came Next

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  On the 18th of April, 2020, Krieger and Systrom launched Rt.live, their first joint project since leaving Facebook. The tool tracked how fast COVID-19 was spreading across each US state, offering up-to-date figures during a period when reliable public data was difficult to find. Then, on the 31st of January, 2023, the pair launched Artifact on the App Store and Google Play. Artifact was a news app, and it drew attention immediately, but within roughly a year of launching, the two announced they were shutting it down. The shutdown came in January 2024. On the 15th of May, 2024, Krieger announced a significant change of direction: he was joining Anthropic as its chief product officer. In July 2025, he also joined the board of Figma. By January 2026, he had moved onto Anthropic's Labs team.

• 6. Philanthropy

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  In April 2015, Krieger announced a partnership with GiveWell, the charity evaluator known for its rigorous analysis of nonprofit effectiveness. He committed US$750,000 over two years. Ninety percent of those funds were to be directed toward grants identified through the Open Philanthropy Project process, with the remaining ten percent supporting GiveWell's operations directly. In 2021, Krieger and his wife helped fund the opening of the Institute of Contemporary Art San Francisco, known as ICA SF, in the Dogpatch neighborhood. That effort brought together support from Krieger alongside contributions from Pamela and David Hornik and from Deborah and Andy Rappaport. Krieger married Kaitlyn Trigger in 2015, the same year he made the GiveWell commitment.