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Denis Yarats

Denis Yarats is a computer scientist and entrepreneur who serves as co-founder and chief technology officer of Perplexity, an AI-driven answer engine that has positioned itself as a challenger to conventional search [1]. He has described the company's founding insight as a rejection of the plain chat interface that became dominant after the rise of chatbots, arguing that Perplexity's differentiation lies in a simple, intuitive product built specifically to answer questions rather than to generate open-ended conversation [3][4]. Yarats frames search as an extremely difficult, essentially open-ended technical problem, and says that rather than competing broadly with Google he and his co-founders chose to focus narrowly on a subset of that problem and pursue it with depth and rigor [3][4].

A recurring theme in Yarats's public remarks is truthfulness and citation as the technical and philosophical core of Perplexity's product. He traces this emphasis to his and his co-founder's academic backgrounds, where citing sources is standard practice, and says the team decided early that accuracy and speed would be the company's primary focus areas given the risks of misinformation in large language model outputs [4]. He has outlined a technical approach that combines large language models with a custom ranking and retrieval system, cross-referencing multiple web sources to identify and resolve contradictions, and presenting multiple viewpoints when sources disagree rather than defaulting to a single biased answer [4]. He also describes building self-verification capability into the models so that mistakes can be caught and fed back into a continuous improvement loop, which he refers to as establishing a data flywheel [4].

On company building, Yarats has said that Perplexity's early hiring emphasized small numbers of highly trusted people, achieved in part through week-long working trial periods rather than conventional interviews for roughly the company's first ten to fifteen hires [3]. He credits this early foundation, including hiring collaborators he had worked with previously, with establishing a fast-moving, execution-focused culture that persisted as the company scaled, expressing the view that maintaining velocity as an organization grows is one of the central challenges of leadership [3]. He has characterized his own experience running the company's technology as closer to a lifestyle than a conventional job, citing the pace of daily change since Perplexity's launch [4].

Beyond these public discussions of product philosophy and culture, Yarats has appeared across multiple technology and AI-focused podcasts and interviews to discuss Perplexity's approach to search, retrieval, and the broader shift from search engines toward what he and his co-founder Aravind Srinivas have called "answer engines" [5][6][7][8][9][10][11][12][13][14][15].

Insights & ideas

Denis Yarats sees Perplexity's differentiation from Google as rooted in giving direct answers rather than forcing users through multiple links, arguing search is "AI complete" and that even the best search engine still leaves gaps to fill [2]. He treats truthfulness, citations, and avoiding bias as the most fundamental part of the product, tracing this instinct to an academic background where citing sources is second nature, and stresses that combatting misinformation requires good models, strong ranking systems, multi-source reconciliation, and models that can self-verify and correct mistakes to build a data flywheel [2]. He is emphatic about simplicity and intuitive design, having rejected a plain chat interface early on, and about focusing narrowly on doing a few things with high quality rather than spreading across many features [1][2]. On culture, he credits slow, deliberate hiring through week-long trial periods for building a strong founding team that set a lasting standard of speed and operational excellence, and says his ongoing challenge as the company scales is preserving that early velocity [1].

Experience

  1. Co-Founder & CTO
    PerplexityAug 2022 to Present
  2. Angel Investor
    Denis YaratsJan 2024 to Present
  3. AI Research Scientist
    Facebook AI ResearchJun 2016 to Jul 2022
  4. Staff ML engineer
    QuoraSep 2013 to Jun 2016
  5. Software Development Engineer II
    MicrosoftNov 2011 to Sep 2013

Education

Media & appearances

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