Stephen Ciesinski
Angel Investor
San Francisco, United States
Stephen Ciesinski is a seed investor in San Francisco focused on FinTech and Software. Stephen Ciesinski - President @ SRI International
- Total investments:
- 5
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Stephen Ciesinski invests in
Stages Stephen Ciesinski invests in
Countries Stephen Ciesinski invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
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Round size
- Seed
- $1.5M–$2.3M
Investment Focus
Industry
- FinTech 2 (40%)
- Software 2 (40%)
- Alumni 1 (20%)
- Credit 1 (20%)
- Mobile 1 (20%)
Stage
- Seed 4 (80%)
- Pre-Seed 1 (20%)
Country
- United States 4 (80%)
- United Kingdom 1 (20%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| At Synnada, we are not just part of the AI revolution; we are leading it. Founded by trailblazers Dr. Mehmet Ozan Kabak and Sami Can Tandogdu, Synnada is disrupting the AI landscape with our groundbreaking AI-native, unified data processing, and high-efficiency compute layer.Our cutting-edge frameworks for model development and training enableorganizations to seamlessly embed AI into their DNA, unlocking unprecedented levels of innovation and efficiency across diverse industries.As a powerhouse in the open-source community, Synnada stands out as a top contributor to Apache DataFusion and Mithril. Our pioneering solutions are a testament to our relentless pursuit of excellence and our unwavering commitment to propelling the data science community forward.Join us and be a part of this transformative journey. With Synnada’s unparalleled expertise and innovative approach, we are not just imagining the future of AI—we are building it. Dare to innovate, and revolutionize your operations with Synnada’s visionary technology today. | $2.6M / Pre-Seed / Dec 28, 2021 | ||
| Picus developed a novel and holistic approach to IT security: Continuous Security Validation. The Picus Security Validation Platform simulates real-world cyber threats to evaluate and optimize cybersecurity measures, ensuring organizations are prepared for potential security breaches. Picus enables businesses to test their security controlscontinuously, identifying gaps and weaknesses in their defenses. The company's technology integrates with existing security tools, providing actionable insights to enhance an organization’s ability to detect, prevent, and respond to cyber-attacks. | $1.7M / Seed / Jun 11, 2018 | ||
| Luther Systems provides a blockchain technology that specializes in offering systems for financial institutions' transaction management and also offers advisory services to financial and technology start-ups on technical and strategic issues, enabling to transact with digital ledgers. Luther Systems works with multiple corporations tostreamline and improve the efficiency, reliability, and integrity of enterprise processes. The products deliver superior performance while reducing costs to clients.The company was established in 2016 and is based in London. | $1.5M / Seed / Mar 08, 2018 | ||
| BrightCrowd improves engagement among students and alumni through simple, digital community books. By focusing on more intimate networks, these books allow members of a specific class or group to share a bit about themselves and get a more personal view of their classmates. | Seed / Oct 11, 2016 | ||
| PayJoy is a mission-first credit provider dedicated to helping under-served customers in emerging markets to achieve financial stability and success. Our patented technology for secured credit provides an on-ramp for new customers to enter the credit system. Through PayJoy’s point-of-sale financing and card offerings, customers gain access to amodern quality of life. PayJoy’s credit also allows our customers to seize opportunities as micro-entrepreneurs, and acts as insurance for tough times. Through our cutting-edge machine learning, data science, and anti-fraud AI, we have served nearly 20 million customers and lent nearly $4B as of 2026 while achieving solid profitability and growth. | $2.3M / Seed / Dec 18, 2015 |
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FAQ
What does Stephen Ciesinski invest in?
Stephen Ciesinski invests primarily in FinTech, Software and Alumni startups, most often at Seed and Pre-Seed stage. Most of the 5 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does Stephen Ciesinski invest in?
Stephen Ciesinski typically joins rounds of $1.5M–$2.3M at Seed. These are whole funding-round sizes, not Stephen Ciesinski's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Stephen Ciesinski took part in.
How do I contact Stephen Ciesinski?
Public channels for Stephen Ciesinski include LinkedIn and X (Twitter). 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 Stephen Ciesinski last invest?
The most recent investment recorded for Stephen Ciesinski closed in Dec 2021. 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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