PeopleofSuperintelligence

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Holden Karau

Holden Karau is a software engineer and open-source contributor whose Apache Spark work and AI-assisted health insurance appeals connect large data systems with generative AI. She studied computer science at Waterloo and built product-classification and recommendation tools at Amazon. Her work spans Foursquare, Google, Databricks, IBM, Apple and Netflix, and she coauthored two books on Spark. In 2024, she launched Fight Health Insurance, an open-source platform that uses large language models to help people appeal health-insurance denials. As of October 2026, she is a Principal Software Engineer for Spark at Snowflake and a co-founder of Fight Health Insurance.

Timeline

  1. 2004–2009

    Waterloo computer science

    She studies computer science in the University of Waterloo's co-op Bachelor of Math program from 2004 to 2009.

  2. 2008–2011

    AI tools at Amazon

    At Amazon, she interns in 2008 and works as a software development engineer from 2009 to 2011. She builds an AI-based product misclassification detector and helps create a system that recommends browse nodes for keywords.

  3. 2011–2014

    Search at Foursquare and Google

    At Foursquare, she improves venue and user search with Elastic Search and Solr and leads the company's search migration from 2011 to 2012. At Google, she works on Google+ storage and recommendation methods from 2012 to 2014.

  4. 2014–2019

    Apache Spark and two books

    She joins Databricks in 2014 to work on Spark and its cloud backend, then becomes a principal software engineer at IBM's Spark Technology Center in 2015. In 2015, she coauthors Learning Spark, an introduction to Apache Spark; in 2017, she coauthors High Performance Spark on query speed and larger workloads. She joins Google in 2017 as an open-source big-data developer advocate working on Spark, Beam, and Dataproc.

  5. 2024

    Spark upgrades and health appeals

    At Netflix, she and Robert Morck present work on automating Apache Spark version upgrades at Netflix scale in 2024. In August 2024, she launches Fight Health Insurance, an open-source platform that uses large language models to help users generate health insurance appeals with AI.

  6. As of October 2026

    Spark engineering at Snowflake

    As of October 2026, she is a Principal Software Engineer for Spark at Snowflake, helping internal teams integrate Spark into Snowflake and contributing improvements to the open-source community. She is an Apache Spark PMC member and committer, with big-data infrastructure experience at Google, Apple, Amazon, Netflix, and IBM. She co-founded Fight Health Insurance, a generative AI tool for appealing health insurance denials.

  1. Google had the most people shaping AI every year from 2014 to 2025Our estimates of which organizations employed the most people shaping AI from 1961 to 2025, with a year-by-year chart.
  2. The United States employs an estimated 53% of people in our data with a known employment countryOur estimates of where AI careers are concentrated now and how countries’ shares of dated positions changed over time.
  3. 46% of living people in our data with known birth and employment countries work outside their birth countryOur estimate of cross-border careers in AI, from country of birth and the country of each current organization.
  4. More people shaping AI studied at Massachusetts Institute of Technology than at any other institutionOur estimates of where the people shaping AI studied and where their careers led, from education records in cited biographies.

Sources and credits

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  1. Holden Karau - Resume holdenkarau.com. Checked 19 October 2026.
  2. Learning Spark: Lightning-Fast Big Data Analysis - Google Books books.google.com. Checked 19 October 2026.
  3. High Performance Spark: Best Practices for Scaling and Optimizing Apache Spark - Google Books books.google.com. Checked 19 October 2026.
  4. ‘Make your health insurance company cry’: One woman’s fight to turn the tables on insurers sfstandard.com. Checked 19 October 2026.
  5. Data+AI Summit 2024 - Retrospective - Apache Spark waitingforcode.com. Checked 19 October 2026.
  6. High Performance Spark — Best Practices for Scaling Apache Spark highperformancespark.com. Checked 19 October 2026.
  7. Open Source Software (OSS) | Snowflake Careers careers.snowflake.com. Checked 19 October 2026.
  8. Holden Karau | QCon San Francisco 2026 qconsf.com. Checked 19 October 2026.