# Juraj Masar

> Juraj Masar is a pre-seed investor backing Software and Health Care. See 3 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Total investments: 3
- Last investment: Sep 2023
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/jurajmasar
- X (Twitter): https://twitter.com/jurajmasar
- Website: http://www.jurajmasar.com
- Facebook: https://www.facebook.com/JurajMasar

Juraj Masar is a pre-seed investor focused on Software and Health Care. Juraj Masar is the Co-Founder and CEO of Better Stack, Co-Founder of Wallmine, and Founder of Customer.guru. He is a former Software Engineer at Prizeo. Juraj Masar attended Charles University.

## Contacts

5 contacts available for Juraj Masar: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/juraj-masar?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Pre-Seed | $1.1M–$2.5M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 1 | 33% |
| Health Care | 1 | 33% |
| Mental Health | 1 | 33% |
| Developer APIs | 1 | 33% |
| Cloud Management | 1 | 33% |

10 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Pre-Seed | 2 | 67% |
| Seed | 1 | 33% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 2 | 67% |
| Czech Republic | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| E2B | E2B is constructing the cloud for AI bots a platform and architecture that allows AI bots to operate freely and as first-class citizens. | $2.5M | Pre-Seed | Sep 06, 2023 | https://e2b.dev |
| ParadeDB | ParadeDB is a Postgres-based ElasticSearch alternative, engineered for lightning-fast full text, similarity, and hybrid search. | $2M | Seed | Sep 01, 2023 | https://paradedb.com |
| Upheal | Upheal is a smart platform for mental health clinicians with AI-powered progress notes, secure video calling, and analytics. They focus on providing care to clients and patients. They offer to reduce their cognitive load and any energy drain. They provide the client and therapist with time-consuming and distracting activities. | $1.1M | Pre-Seed | Oct 18, 2022 | https://www.upheal.io |

3 of 3 investments shown.

## Co-investors
- [KAYA](https://shizune.co/investors/profile/kaya-8ed9) — VC Fund, 2 deals together
- [Calm/Storm VC](https://shizune.co/investors/profile/calm-storm-ventures) — VC Fund, 1 deal together
- [Credo Ventures](https://shizune.co/investors/profile/credo-ventures) — VC Fund, 1 deal together
- [Susa Ventures](https://shizune.co/investors/profile/susa-ventures) — VC Fund, 1 deal together
- [Team Ignite Ventures](https://shizune.co/investors/profile/team-ignite-ventures) — VC Fund, 1 deal together
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 1 deal together

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## FAQ

### What does Juraj Masar invest in?

Juraj Masar invests primarily in Software, Health Care and Mental Health startups, most often at Pre-Seed and Seed stage. Most of the 3 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 Juraj Masar's check size?

Juraj Masar typically joins rounds of $1.1M–$2.5M at Pre-Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Juraj Masar participates in.

### How do I contact Juraj Masar?

Public channels for Juraj Masar 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 Juraj Masar last invest?

The most recent investment recorded for Juraj Masar closed in Sep 2023. Shizune tracks 3 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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