Colin Mackie
Owner at CoinsTax LLC
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolColin Mackie is a seasoned software engineer and founder with 25+ years building scalable, secure products across fintech, crypto, and SaaS. He created Bitcoin.Tax—one of the earliest crypto tax platforms—and now runs Chain Glance, demonstrating deep domain expertise in tax, compliance, and blockchain portfolio tooling. Colin combines hands-on full‑stack engineering (.NET Core, Node.js, AWS, MySQL, MongoDB) with product leadership, having designed tax engines and importers that processed hundreds of millions of trades and billions of gain calculations across multiple countries. He’s led teams, mentored developers, and maintained a high user satisfaction score while running his own ventures, bringing a product-first mindset to technical decisions. An early contributor to projects like the Winauth authenticator, he pairs pragmatic security awareness with real-world systems thinking. Based in Seattle, he’s seeking a long-term senior engineering or technical consulting role where his quiet confidence and end-to-end ownership can move meaningful products forward.
15 years of coding experience
7 years of employment as a software developer
BSc (hons), Computer Science/Software Engineering, BSc (hons), Computer Science/Software Engineering at The University of Birmingham, UKRoyal Hospital School
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (9)
net10
asp-net10
user-authentication10
authentication10
dotnet10
csharp10
dotnet-core10
security10
github8
Programming languages (6)
Github contributions (5)
winauth/winauth
Jul 2010 - Mar 2015
Authenticator on Windows for Battle.net / Steam / Guild Wars 2 / Glyph / Runescape / SWTOR / Bitcoin and digital currency exchanges
Role in this project:
Back-end Developer
Back-end DeveloperContributions:130 commits, 4 pushes, 3 comments in 4 years 8 months
Contributions summary:Colin's initial commit shows the upload of a beta version, indicating the start of development. Subsequent commits include file modifications within the Authenticator project. This suggests the user was responsible for contributing to the core functionality of the authenticator software, potentially including the logic for security features and integrations with various online services. Later commits involved linking to a GitHub repository, showing the user managed the project's source control.
exchangesguildrunescapebattlecurrency
cdmackie/passport-coinbase-oauth
Feb 2019 - Dec 2024
Contributions:5 pushes, 1 branch, 2 tags in 5 years 11 months
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