Jimmy Song
Instructor at Jimmy Song Consulting
Austin, Texas, United States
Summary
🤩
RockstarJimmy Song is a Bitcoin educator, developer, and entrepreneur with 14 years of software engineering experience, based in Austin, Texas. He teaches blockchain programming at the University of Texas and through Programming Blockchain while advising firms like Unchained Capital and Level, and serving as an expert witness in Bitcoin litigation. A hands-on contributor to core Bitcoin projects, Jimmy optimized cryptographic primitives and performance in btcd and improved testing and offline-signing capabilities in Armory and Bitcoin Core, demonstrating deep protocol-level expertise. He combines academic teaching, practical engineering, and industry advisory roles to promote “sound money,” and has authored books and O’Reilly content to broaden Bitcoin literacy. Less obvious: his background spans both large fintech architecture roles (Paxos) and low-level crypto performance engineering, giving him rare fluency across product, protocol, and pedagogy.
14 years of coding experience
17 years of employment as a software developer
Stackoverflow
233reputation
11kreached
5answers
0questions
Github Skills (36)
json-rpc10
unit-testing10
transaction10
code-signing10
pytest10
python10
back-end-development10
testing10
test-framework10
bitcoin10
bitcoins10
signing10
functional-testing10
secp256k110
go10
Programming languages (13)
Github contributions (5)
etotheipi/BitcoinArmory
Dec 2014 - Oct 2015
Python-Based Bitcoin Software
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:70 commits, 1 PR, 91 pushes in 10 months
Contributions summary:Jimmy primarily contributed to the `bitcoinarmory` repository by fixing bugs and improving the codebase related to the armoryd daemon and its associated testing framework. The user addressed issues in the startup tests, corrected methods, and enhanced the functionality of the armoryd server. They also refactored code, improved error handling, and added new JSON-RPC calls to improve the system's capabilities, specifically around transaction signing and lockbox functionalities, which are essential to the wallet's offline signing features.
pythonbitcoin
btcsuite/btcd
Mar 2014 - Jul 2016
An alternative full node bitcoin implementation written in Go (golang)
Role in this project:Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:5 commits, 5 PRs, 27 comments in 2 years 4 months
Contributions summary:Jimmy primarily focused on optimizing the performance of the `btcd` Bitcoin implementation. They improved addblock logging, including the addition of new properties for the block importer to track processing statistics. Their significant contributions centered on optimizing the `ScalarBaseMult` and `ScalarMult` functions through the implementation of endomorphism and NAF optimizations, leading to substantial performance gains. The user also refactored code to use btcec structs instead of ecdsa structs, enhancing the maintainability of the codebase.
golangfull-nodebitcoin-nodebtcdcryptocurrency
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