# Mitko Simeonov

> Mitko Simeonov (Dimitar Simeonov) is the founder and CEO of Pioneer, a San Francisco startup that uses large language models to help climate tech companies win government grants, contracts and incentives in a fraction of the usual time. A Bulgarian math olympian turned MIT-trained AI engineer, he shipped machine learning to hundreds of millions of users at Twitter before building Pioneer, which raised $2.9M in seed funding led by Blue Bear Capital in late 2023. He describes himself as a compulsive problem solver and writes a long-running blog about thinking independently.

- **Role:** Founder & CEO at Pioneer
- **Organizations:** Pioneer, Twitter, Dropbox, Slapdash, MIT, On Deck
- **From:** Bulgaria
- **Nationality:** Bulgarian
- **Education:** Studies in computer science, mathematics, and engineering; Master's in AI and natural language models, Massachusetts Institute of Technology (MIT)
- **Known for:** Founder and CEO of Pioneer, raising $2.9M in seed funding, Deployed AI to hundreds of millions of users at Twitter, Earned a Master's focused on AI and natural language models at MIT

## Career timeline

- **2008-2012** — Research Assistant at MIT, studying AI and natural language models
- **2013-2017** — Staff Software Engineer at Twitter, deploying AI to hundreds of millions of users
- **2019** — Founding Engineer at Slapdash (Y Combinator W19)
- **2022** — Co-founded Pioneer with COO Kyle Treige
- **2023-02** — Pioneer launches its AI-powered funding service
- **2023-11** — Pioneer raises $2.9M seed round led by Blue Bear Capital

## Achievements

- Founder and CEO of Pioneer, raising $2.9M in seed funding
- Deployed AI to hundreds of millions of users at Twitter
- Earned a Master's focused on AI and natural language models at MIT
- Former member of Bulgaria's national math olympiad team (IMO)

## Latest updates

- **2023-11** — Pioneer closed a $2.9M seed round led by Blue Bear Capital with Collaborative Fund, Soma Capital, Cool Climate Collective and Kayan Ventures.

## Links

- Website: https://www.pioneerclimate.com
- LinkedIn: https://www.linkedin.com/in/dimitarsimeonov/
- Twitter/X: https://twitter.com/themitak
- GitHub: https://github.com/mitko

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Profile page: https://yespress.io/mitko-simeonov
Published by YesPress — https://yespress.io
Last updated: 2026-06-22