Oren Yomtov
Angel Investor, Principal Security Researcher at Koi
Tel-Aviv District, Israel
Summary
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SeniorOren Yomtov is an experienced technologist and entrepreneur with a decade of hands-on experience across blockchain research, security, and full-stack development. Currently leading blockchain research at Fireblocks and serving as Principal Security Researcher and angel investor at Koi, he blends offensive security expertise with pragmatic engineering to secure high-value crypto infrastructure. His open-source contributions span notable projects like fbchat and Ethereum's Sourcify, where he improved reliability and compiler performance—evidence of a developer who dives into both UX and low-level build/tooling issues. A former CEO, university lecturer, and IDF software engineer, he pairs leadership and teaching with real-world adversarial testing experience. Based in Tel Aviv, he’s a public speaker whose work has been featured at RSA Conference and in outlets like Business Insider, reflecting both technical credibility and a knack for communicating complex security topics.
10 years of coding experience
11 years of employment as a software developer
English, Hebrew
Stackoverflow
665reputation
133kreached
6answers
6questions
Github Skills (26)
javascript10
facebook-messenger10
python10
messenger10
facebook-messages10
html-parsing10
ethereum10
smart-contracts10
facebook-chat10
react10
solidity9
beautifulsoup9
http-request9
debug8
debugging8
Programming languages (19)
Github contributions (5)
fbchat-dev/fbchat
May 2018 - Jun 2018
Facebook Chat (Messenger) for Python
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 commits, 4 PRs, 3 comments in 1 month
Contributions summary:Oren primarily focused on bug fixes and code improvements for the fbchat Python library. They addressed an `IndexError` bug related to thread fetching and updated the library to obtain necessary tokens and data, including `fb_dtsg` and `fb_h`, from Facebook's APIs. Additionally, the user eliminated an unnecessary HTTP request during login and replaced the `lxml` parser dependency with Python's built-in HTML parser.
facebook-messenger-botpythonchatchat-messengerfacebook
ethereum/sourcify
Sep 2022 - Sep 2022
Source code verification service for Ethereum smart contracts
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:5 commits, 2 PRs, 3 comments in 1 day
Contributions summary:Oren contributed to both the front-end and back-end of the Sourcify project. They addressed a performance issue by increasing the maximum buffer size for the Solidity compiler. They also made multiple UI changes, including fixing useEffect dependencies, allowing deep linking, and refactoring the lookup page.
ethereumcontractblockchaindecentralizedsolidity
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