# Arvind Sundararajan

> Arvind Sundararajan is the San Francisco-based CTO and co-founder of Abacus.AI. A computer scientist trained at IIT Bombay and Stanford, he helped lead the backend of Gmail around its launch, led machine-learning and serving work for AdSense, co-founded Post Intelligence, ran autonomy-systems engineering in Uber's self-driving program, and returned to entrepreneurship in 2019. His recurring project is to turn difficult infrastructure into products ordinary users can operate.

- **Role:** CTO and Co-Founder at Abacus.AI
- **Organizations:** Abacus.AI, Uber Advanced Technologies Group, Post Intelligence, Candid, Google, Alpiri
- **Education:** B.Tech in Computer Science, Indian Institute of Technology Bombay, M.S. in Computer Science, Stanford University
- **Known for:** Helped lead Gmail's backend around its initial launch and through early scale., Led machine-learning and serving-system work for Google AdSense., Received two Google Founders Awards, associated in public profiles with his Gmail and AdSense work.

## Career timeline

- **1996** — Graduated from IIT Bombay with a B.Tech in Computer Science.
- **1998** — Earned an M.S. in Computer Science from Stanford University.
- **2004-2008** — Worked at Google as a senior engineer and technical lead, including Gmail backend work around its launch and machine-learning and serving systems for AdSense.
- **2010-2017** — Co-founded and served as CTO of Post Intelligence, formerly MyLikes, with Bindu Reddy.
- **2016-2017** — Served as CTO and co-founder of Candid, a newsfeed product developed within Post Intelligence that used deep learning for moderation.
- **2017** — Post Intelligence was acquired by Uber.
- **2017-2019** — Worked as a senior technical leader at Uber's autonomous-vehicles division, leading the Autonomy Systems team across onboard software, machine learning and infrastructure.
- **2019** — Co-founded RealityEngines.AI with Bindu Reddy and Siddartha Naidu; the company later became Abacus.AI.
- **2020** — RealityEngines.AI rebranded as Abacus.AI and announced a $13 million Series A.
- **2021** — Abacus.AI raised a $50 million Series C, taking disclosed funding above $90 million.
- **2023** — Co-authored the Giraffe paper on extending the context length of large language models.

## Achievements

- Helped lead Gmail's backend around its initial launch and through early scale.
- Led machine-learning and serving-system work for Google AdSense.
- Received two Google Founders Awards, associated in public profiles with his Gmail and AdSense work.
- Co-founded Post Intelligence and built it through its 2017 acquisition by Uber.
- Led Uber ATG's Autonomy Systems team across onboard software, machine learning and infrastructure.
- Co-founded Abacus.AI, which raised more than $90 million in disclosed funding by October 2021.
- Co-authored Giraffe, a 2023 paper and open release exploring long-context large language models.
- Named inventor on Google patents concerning structured-data search and adding attributes and labels to structured data.

## Latest updates

- **2023-08** — Co-authored Giraffe, research on extending LLM context lengths, with three released evaluation datasets and long-context models.
- **2021-10** — Abacus.AI announced a $50 million Series C led by Tiger Global with participation from Coatue, Index Ventures and Alkeon Capital.
- **2020-07** — RealityEngines.AI became Abacus.AI and announced its Series A.

## Links

- Website: https://xenon.stanford.edu/~arvind/
- LinkedIn: https://www.linkedin.com/in/arvindsundararajan

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Profile page: https://yespress.io/arvind-sundararajan
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Last updated: 2026-09-27