# Nikola Borisov

> Nikola Borisov is the co-founder and CEO of Deep Infra, a Palo Alto cloud company that runs open-source AI models as a low-cost, low-latency inference service. A former competitive programmer who scaled messaging backends to hundreds of millions of users at imo.im and helped build HalloApp's founding backend, he bet early that inference, not training, would become the real bottleneck of the AI era. Deep Infra now processes close to five trillion tokens a week and raised a $107M Series B in May 2026 backed by NVIDIA, 500 Global, Felicis and others.

- **Role:** Co-founder & CEO at Deep Infra Inc.
- **Organizations:** Deep Infra Inc., HalloApp, imo.im, Northwestern University
- **Nationality:** Bulgarian (based in United States)
- **Education:** B.S. Computer Science, minor in Economics, Northwestern University
- **Known for:** Co-founded and leads Deep Infra, now processing close to 5 trillion tokens per week, Raised a total of ~$133M across seed, Series A and Series B rounds, Grew token processing volume 25x since the Series A and tripled revenue since the start of 2026

## Career timeline

- **2004** — Won a gold medal at the 12th Balkan Olympiad in Informatics
- **2006-2007** — Won the ACM ICPC Mid-Central Regional Championship; served as president of Northwestern's ACM chapter
- **2010** — Graduated from Northwestern University; joined imo.im as a Software Development Engineer
- **2020** — Became Director of Engineering at imo.im, having scaled distributed backends to 200M+ users
- **2020-2022** — Backend Software Engineer and founding-team member at HalloApp, building the backend in Erlang, ProtoBuf, AWS and Redis
- **2022** — Co-founded Deep Infra in Palo Alto with Georgios Papoutsis and Yessenzhar Kanapin
- **2023** — Deep Infra emerged from stealth with an $8M seed round led by A.Capital Ventures and Felicis
- **2025** — Raised an $18M Series A led by Felicis with investor Georges Harik
- **2026** — Closed a $107M Series B co-led by 500 Global and Georges Harik, with NVIDIA, Felicis, Samsung Next, Supermicro and others

## Achievements

- Co-founded and leads Deep Infra, now processing close to 5 trillion tokens per week
- Raised a total of ~$133M across seed, Series A and Series B rounds
- Grew token processing volume 25x since the Series A and tripled revenue since the start of 2026
- Built an inference cloud serving 150+ open-source models across 8 U.S. data centers
- Early collaborator with NVIDIA on Blackwell and Vera Rubin GPUs
- Gold medal, 12th Balkan Olympiad in Informatics (2004)
- ACM ICPC Mid-Central Regional Champion (2006, 2007)
- Scaled imo.im's backend infrastructure to more than 200 million users

## Latest updates

- **2026-05** — Deep Infra closed a $107M Series B co-led by 500 Global and Georges Harik, with NVIDIA, Felicis, Samsung Next, Crescent Cove, PEAK6, Supermicro and Upper90 participating.
- **2026-05** — Company reported processing nearly 5 trillion tokens per week and operating 8 U.S. data centers with global expansion underway.

## Links

- Website: https://deepinfra.com
- LinkedIn: https://www.linkedin.com/in/nikola-borisov/
- Twitter/X: https://twitter.com/DeepInfra
- GitHub: https://github.com/NikolaBorisov

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Profile page: https://yespress.io/nikola-borisov
Published by YesPress — https://yespress.io
Last updated: 2026-07-01