Marcel O'neil

Old Toronto, Ontario, Canada

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Summary

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Rockstar

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Top School

Marcel O'neil is a software engineer with 11 years of hands-on experience and a strong open-source footprint, including co-maintaining Electron Cash and contributions to high-profile projects like Electrum and Keybase. A University of Waterloo Software Engineering student, he has interned at Stripe, BitGo, Jane Street and Keybase, bringing production-grade backend experience across crypto, payments, and security. He’s an organiser of Toronto’s privacy-focused Citizen Hacks and a seasoned hackathon competitor with wins at major events such as Hack the North, showing a knack for rapid prototyping and product instincts. Marcel’s contributions range from wallet crash fixes and hardware-wallet integrations to adding chat API features, demonstrating practical impact on both low-level crypto tooling and distributed services. Based in Old Toronto, he blends academic rigor with startup and open-source culture, often surfacing non-obvious improvements that boost usability and reliability.

11 years of coding experience

2 years of employment as a software developer

University of Toronto Schools

BSE, Software Engineering, BSE, Software Engineering at University of Waterloo

English, French

Stackoverflow

Stats

133reputation

70reached

0answers

1question

Github Skills (20)

ec10

python10

api-design10

bitcoin-wallet10

command-line-interface10

bitcoin10

el10

bitcoins10

go10

command-line10

cli10

go-modules9

localization9

chat9

testing8

Programming languages (13)

JavaC++CGoHTMLJupyter NotebookTypeScriptCoffeeScript

Github contributions (5)

keybase/client

Aug 2019 - Nov 2021

Keybase Go Library, Client, Service, OS X, iOS, Android, Electron

Role in this project:

Backend Developer

Contributions:1 review, 12 commits, 19 PRs in 2 years 3 months

Contributions summary:Marcel contributed significantly to the backend functionality of the Keybase client. Their primary focus was implementing the "add-to-channel" command, involving modifications to command-line interface components and the chat API handler. These changes required adding a new API method to the client and service handler and updating various test files, demonstrating a comprehensive understanding of the client's architecture. Additionally, the user addressed typos in the chat API documentation.

golangreactelectronreact-nativeclient-library

spesmilo/electrum

Jan 2018 - Jul 2018

Electrum Bitcoin Wallet

Role in this project:

Back-end Developer

Contributions:7 commits, 7 PRs, 9 comments in 6 months

Contributions summary:Marcel contributed to bug fixes and improvements within the Electrum Bitcoin Wallet. Their commits involved fixing locale documentation, enhancing Ledger hardware wallet version comparison, resolving a crash related to private key export, and preventing requirements.txt from being installed to /usr. They also fixed a localization issue related to a download link and badge. Their work focused on improving the wallet's functionality and usability.

pythonelectrumlightningwalletcryptocurrency

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