# Janusz Niewiadomski

> Janusz Niewiadomski is a pre-seed investor at ISEC (Warsaw) backing Finance and IT Management. See 2 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [ISEC](https://shizune.co/investors/profile/isec-802c)
- Location: Warsaw, Poland
- Total investments: 2
- Last investment: May 2025
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/janusz-niewiadomski-6173711
- X (Twitter): https://twitter.com/ph_nk

Janusz Niewiadomski is a pre-seed investor at ISEC in Warsaw focused on Finance and IT Management. Janusz Niewiadomski is the President and Co-Owner of ISEC. He previously worked at COSEINC as a Senior Security Researcher.

## Round sizes

| Stage | Round size |
| --- | --- |
| Pre-Seed | $1.4M–$1.4M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Finance | 1 | 50% |
| IT Management | 1 | 50% |
| Telecommunications | 1 | 50% |
| Enterprise Software | 1 | 50% |
| Identity Management | 1 | 50% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Defguard | Defguard is an open-source on-premise security platform and was created to give businesses powerful capabilities for safe access control. | $1.4M | Pre-Seed | May 21, 2025 |  |
| Defguard | Defguard is an open-source on-premise security platform and was created to give businesses powerful capabilities for safe access control. | $1.4M | Pre-Seed | May 21, 2025 |  |

2 of 2 investments shown.

## Co-investors
- [Hard2beat](https://shizune.co/investors/profile/hard2beat) — VC Fund, 2 deals together
- [S20 Fund](https://shizune.co/investors/profile/s20-team) — VC Fund, 2 deals together
- [SMOK Ventures](https://shizune.co/investors/profile/smok-ventures) — VC Fund, 2 deals together
- [ISEC](https://shizune.co/investors/profile/isec-802c) — VC Fund, 1 deal together

## About ISEC

VC Fund · Warszawa, Poland

ISEC offers penetration tests, source code analysis, vulnerability assessment, social-engineering, project support, research and development. They also offer to test their compliance with the clients security requirements.

1 contacts available at ISEC.

| Name | Title | Profile |
| --- | --- | --- |
| Janusz Niewiadomski | President and Co-Owner | https://shizune.co/investors/profile/janusz-niewiadomski |

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### Similar stage
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### Similar country
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## Featured in investor lists
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## FAQ

### What does Janusz Niewiadomski invest in?

Janusz Niewiadomski invests primarily in Finance, IT Management and Telecommunications startups, most often at Pre-Seed stage. Most of the 2 investments tracked by Shizune back companies in Poland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Janusz Niewiadomski's check size?

Janusz Niewiadomski typically joins rounds of $1.4M–$1.4M 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 Janusz Niewiadomski participates in.

### When did Janusz Niewiadomski last invest?

The most recent investment recorded for Janusz Niewiadomski closed in May 2025. Shizune tracks 2 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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