# Jason Warner

> Jason Warner is a seed investor at poolside backing Software and Information Technology. See 62 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [poolside](https://shizune.co/investors/profile/poolside-06b4)
- Location: San Francisco, United States
- Total investments: 62
- Last investment: Jul 2026
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/jcwarner/
- X (Twitter): https://twitter.com/jasoncwarner
- Website: https://x.com/jasoncwarner

Jason Warner is a seed investor at poolside in San Francisco focused on Software and Information Technology. Jason Warner is based out of San Francisco, California, and is the Co-founder and CEO of Poolside. Jason previously worked at Redpoint as a Managing Director. Jason Warner attended the Rensselaer Polytechnic Institute.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $2M–$5M |
| Pre-Seed | $878k–$4M |
| Series A | $8M–$25M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 31 | 50% |
| Information Technology | 13 | 21% |
| Developer Tools | 8 | 13% |
| Artificial Intelligence | 8 | 13% |
| SaaS | 6 | 10% |

73 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 37 | 60% |
| Series A | 15 | 24% |
| Pre-Seed | 6 | 10% |
| Funding Round | 1 | 2% |
| Venture - Series Unknown | 1 | 2% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 42 | 68% |
| Canada | 4 | 6% |
| Spain | 1 | 2% |
| Israel | 1 | 2% |
| United Kingdom | 1 | 2% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Meticulous | Meticulous is a tool for detecting bugs in web applications. The company was founded in 2021. | $15M | Series A | Jul 15, 2026 |  |
| ConfigHub Inc. | Cloud-based configuration platform for modern application teams | $4M | Pre-Seed | Mar 26, 2025 |  |
| Patronus AI | Patronus AI develops simulation research and infrastructure aimed at accelerating the progress towards human-aligned artificial general intelligence (AGI). The company provides evaluation models and tools designed to detect issues such as hallucinations, safety risks, and reasoning failures, as well as support custom evaluation workflows. PatronusAI also offers datasets, benchmarking capabilities, and automated evaluators for text, image, and multimodal AI applications. In addition, it conducts research on digital world models and simulation environments intended to support the training and assessment of increasingly capable AI agents. | $17M | Series A | May 22, 2024 |  |
| cside | c/side is a cybersecurity company that provides monitoring solutions, optimizing, and safeguarding vulnerable browser-side third-party scripts. | $1.7M | Pre-Seed | May 16, 2024 |  |
| Series | Series provides full-stack enterprise financial services designed for institutions & enterprises. |  | Seed | Sep 26, 2023 |  |
| Series | Series provides full-stack enterprise financial services designed for institutions & enterprises. | $25M | Series A | Sep 26, 2023 |  |
| Svix | Svix is the webhooks-as-a-service platform that empowers companies of all sizes to send webhooks easily and reliably. | $7.8M | Venture - Series Unknown | Feb 22, 2023 |  |
| Meticulous | Meticulous is a tool for detecting bugs in web applications. The company was founded in 2021. | $4M | Seed | Feb 06, 2023 |  |
| slai | slai deploys machine learning models in minutes using infrastructure managed for you. | $3.5M | Seed | May 10, 2022 |  |
| Beam | Rapidly Develop AI Projects | $3.5M | Seed | May 10, 2022 |  |

10 of 62 investments shown.

## Co-investors
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 8 deals together
- [Scribble Ventures](https://shizune.co/investors/profile/scribble-ventures) — VC Fund, 7 deals together
- [Andreessen Horowitz](https://shizune.co/investors/profile/andreessen-horowitz) — VC Fund, 6 deals together
- [Index Ventures](https://shizune.co/investors/profile/index-ventures) — VC Fund, 6 deals together
- [Kleiner Perkins](https://shizune.co/investors/profile/kleiner-perkins-caufield-byers) — VC Fund, 6 deals together
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund, 5 deals together

## About poolside

VC Fund

Poolside is developing cutting-edge foundation concepts and infrastructure that will reinvent connection with software development. The democratization of software creation — where the only practical constraint is their own inventiveness and the safety features built into the systems — will have a massive impact on the global economy and,eventually, quality of life.

1 contacts available at poolside.

| Name | Title | Profile |
| --- | --- | --- |
| Jason Warner | Co-founder, CEO | https://shizune.co/investors/profile/jason-warner |

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## FAQ

### What does Jason Warner invest in?

Jason Warner invests primarily in Software, Information Technology and Developer Tools startups, most often at Seed and Series A stage. Most of the 62 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Jason Warner's check size?

Jason Warner typically joins rounds of $2M–$5M at Seed, $878k–$4M at Pre-Seed and $8M–$25M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Jason Warner participates in.

### When did Jason Warner last invest?

The most recent investment recorded for Jason Warner closed in Jul 2026. Shizune tracks 62 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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