# Voytek Siewierski

> Voytek Siewierski is a Series A investor at NTT DoCoMo backing Software and Machine Learning. See 5 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [NTT DoCoMo](https://shizune.co/investors/profile/ntt-docomo)
- Location: Menlo Park, United States
- Total investments: 5
- Last investment: Jun 2022
- Lead investor: 60%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/pub/voytek-siewierski/0/a37/562

Voytek Siewierski is a Series A investor at NTT DoCoMo in Menlo Park focused on Software and Machine Learning. Before joining Rogers VP, Voytek was a partner with Mitsui Venture Partners in Silicon Valley.Earlier, Voytek was an Executive Director at NTT DoCoMo, spending 6 years in Japan and 3 years in the UK. Voytek played a key role in planning and implementing NTT DoCoMo’s Silicon Valley-based VC Fund – DoCoMo Capital.Earlier, Voytek was an activemember of i-mode project, which created the world’s largest and most successful mobile Internet portal. He has also developed a number of successful value added mobile services with partners such as Walt Disney Corporation, Warner Brothers, CNN and others.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 2 | 40% |
| Machine Learning | 2 | 40% |
| Enterprise Software | 2 | 40% |
| B2B | 1 | 20% |
| SaaS | 1 | 20% |

15 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 2 | 40% |
| Seed | 1 | 20% |
| Series B | 1 | 20% |
| Convertible Note | 1 | 20% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Poland | 3 | 60% |
| United States | 1 | 20% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| SmokeD System Inc. | Hardware Embedded SaaS, AI, deep learning, machine learning - the newest technology for wildfire detection | $2.5M | Convertible Note | Jun 13, 2022 |  |
| SmokeD System Inc. | Hardware Embedded SaaS, AI, deep learning, machine learning - the newest technology for wildfire detection | $2.5M | Seed | Jun 13, 2022 |  |
| CashDirector | CashDirector helps SMB banks differentiate from competition, acquire more new business & protect client relationships using innovative added value services. CashDirector is the leading provider of bank branded accounting platforms with cash flow management tools for banks serving MICRO & SMB clients - as an innovative add-on to existingonline banking. CashDirector application is based on AI accounting robot technology, allowing business transactions & bank operations to be booked in real time. According to a US Bank report over 80% of SMB failures are due to poor cash management. CashDirector solve this problem, helping SMBs manage cash flow and payments directly from their online bank accounts, thus creating a long-term relationship with the bank and building their loyalty. | $2.9M | Series A | May 08, 2020 |  |
| Sinterit | Sinterit is the company based in Kraków (Poland) that specializes in development of SLS 3d printers. It has been found in 2014. Sinterit’s mission is to build professional and affordable 3d printer in SLS (Selective Laser Sintering) technology. SLS technology is the next step in 3d printing: it makes possible to print objects that are difficult orimpossible to be printed in FDM (Fused Deposition Modeling) technique – the most popular technology in 3d printing market. Currently Sinterit ships Lisa all over the world. | $2.5M | Series B | Feb 26, 2020 |  |
| Docurated | Docurated’s cloud-based solutions offer the fastest and simplest way to find and use content. With Docurated’s smart approach to document management, customers drive more economic value out of existing storage investments. It’s the end of files, folders and document tagging. Docurated enables users to instantly find and use the exact and mostrelevant page, paragraph, slide and chart without opening a single folder or file, all while keeping IT departments happy. Content in shared drives and systems like SharePoint, Box and Dropbox instantly becomes visually searchable and actionable. For more information on how Docurated helps enterprises such as Netflix, Amgen, Cox Media, Mindshare, Kaiser Permanente transform information into insight and enable happy productive employees, visit www.docurated.com. | $3.8M | Series A | Feb 06, 2014 |  |

5 of 5 investments shown.

## About NTT DoCoMo

VC Fund · Tokyo, Japan

NTT DOCOMO provides mobile telecommunication services through its W-CDMA networks in Japan. The company offers voice, data, and other value-added services; public wireless LAN and international roaming services; and satellite cell phone services.Its products and services include Office Link, which allows mobile phones to be used as internallines; Business Mopera Anshin Manager, which enables the unified control of corporate mobile phones; Business Plus, a package of cloud-based enterprise services; Dcreators, an online market for accessories, smartphone cases, and interior accessories; Dfashion, a fashion e-commerce site; Dkids, an educational content service for families with infants; Dtravel, a travel service that offers travel support services; and Ddelivery, a food delivery service.In addition, NTT DOCOMO provides Docomo Mail, a cloud-based email service; Docomo ID, an account identification service; machine-to-machine (M2M) services; and Petfit, which allows users to check their pet dog’s health condition or location through smartphones or other devices. Further, it offers services in various business fields, including media, finance, commerce, healthcare, M2M, aggregation, ecology, and safety. Additionally, the company operates in the medical database business as well as provides lifestyle guidance in dining and cooking areas. In addition, it purchases and sells smartphones, tablets, and data communication devices. NTT DOCOMO was founded in 1991 and is headquartered in Tokyo, Japan. Currently, NTT DOCOMO, Inc. operates as a subsidiary of Nippon Telegraph and Telephone Corporation.

5 contacts available at NTT DoCoMo.

| Name | Title | Profile |
| --- | --- | --- |
| Hozumi Tamura | SVP & Managing Director of Smart-life Planning Department & Global Service Planning Office | https://shizune.co/investors/profile/hozumi-tamura |
| Joan Triay | Principal Network Architect, Standards & Design | https://shizune.co/investors/profile/joan-triay |
| Mitoshi Hirokane | Senior Vice President | https://shizune.co/investors/profile/mitoshi-hirokane |
| Shoji Suto | Executive Vice President | https://shizune.co/investors/profile/shoji-suto |
| Syohei Sakaguchi | Senior Vice President & Managing Director of Hokkaido Regional Office | https://shizune.co/investors/profile/syohei-sakaguchi |

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## FAQ

### What does Voytek Siewierski invest in?

Voytek Siewierski invests primarily in Software, Machine Learning and Enterprise Software startups, most often at Series A and Seed stage. Most of the 5 investments tracked by Shizune back companies in Poland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Voytek Siewierski last invest?

The most recent investment recorded for Voytek Siewierski closed in Jun 2022. Shizune tracks 5 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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