Jason Warner
Angel Investor
San Francisco, United States
Jason Warner is a seed investor 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.
- Total investments:
- 62
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Jason Warner invests in
Stages Jason Warner invests in
Countries Jason Warner invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $1.6M–$5M
- Pre-Seed
- $878k–$4M
- Series A
- $8M–$25M
Investment Focus
Industry
- Software 31 (50%)
- Information Technology 13 (21%)
- Developer Tools 8 (13%)
- Artificial Intelligence 8 (13%)
- SaaS 6 (10%)
Stage
- Seed 37 (60%)
- Series A 15 (24%)
- Pre-Seed 6 (10%)
- Funding Round 1 (2%)
- Venture - Series Unknown 1 (2%)
Country
- United States 42 (68%)
- Canada 4 (6%)
- Spain 1 (2%)
- Israel 1 (2%)
- United Kingdom 1 (2%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Meticulous is a tool for detecting bugs in web applications. The company was founded in 2021. | $15M / Series A / Jul 15, 2026 | ||
| Cloud-based configuration platform for modern application teams | $4M / Pre-Seed / Mar 26, 2025 | ||
| 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 | ||
| 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 provides full-stack enterprise financial services designed for institutions & enterprises. | Seed / Sep 26, 2023 | ||
| Series provides full-stack enterprise financial services designed for institutions & enterprises. | $25M / Series A / Sep 26, 2023 | ||
| 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 is a tool for detecting bugs in web applications. The company was founded in 2021. | $4M / Seed / Feb 06, 2023 | ||
| slai deploys machine learning models in minutes using infrastructure managed for you. | $3.5M / Seed / May 10, 2022 | ||
| Rapidly Develop AI Projects | $3.5M / Seed / May 10, 2022 | ||
| See all 62 investments → | |||
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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 $1.6M–$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.
How do I contact Jason Warner?
Public channels for Jason Warner include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
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 Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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