Joe Loser
Senior Engineering Manager, Mojo Libraries at Modular
Denver, Colorado, United States
Summary
🤩
Rockstar🎓
Top SchoolJoe Loser is a senior engineering leader with 11 years of experience building performance-critical systems, including six years in high-frequency trading and extensive work on GenAI serving infrastructure. He currently leads the Mojo libraries team at Modular, where he scaled the org, open-sourced the Mojo standard library and MAX AI Kernel, and shipped portable GPU programmability that was showcased at NVIDIA GTC. A hands-on manager and prolific contributor to major C++ projects (LLVM, Folly, rippled, fbthrift), he brings deep expertise in modern C++, low-latency design, compilers, and language/runtime performance. Joe combines a track record of 0→1 product delivery and team formation with pragmatic engineering practices like TDD/BDD and Bazel-based public builds, driving both community adoption and measurable performance gains. Based in Denver, he pairs system-level rigor with developer advocacy to make high-performance primitives broadly usable.
11 years of coding experience
8 years of employment as a software developer
University of Missouri
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (23)
c-language10
lib10
code-library10
ledger10
cmake10
refactor10
xrp10
computer-engineering10
blockchain10
refactoring10
cpp10
thrift10
cprogramming-language10
boost9
compiler-optimization9
Programming languages (10)
Github contributions (5)
facebook/folly
Jan 2018 - Jan 2023
An open-source C++ library developed and used at Facebook.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:94 commits, 132 PRs, 300 comments in 5 years
Contributions summary:Joe contributed to the Facebook's Folly library by addressing compiler-related issues and enhancing code functionality. Their work included implementing configuration checks for OpenMP support, adding missing overrides for virtual methods, and resolving format warnings. Moreover, they fixed unused parameters and refactored code to streamline the build process and improve compatibility with Clang.
facebookcppc-library
XRPLF/rippled
May 2018 - Nov 2018
Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++
Role in this project:Back-end Developer
Back-end DeveloperContributions:27 commits, 34 PRs, 226 comments in 6 months
Contributions summary:Joe primarily focused on code quality improvements and bug fixes within the rippled codebase. Their contributions included removing redundant code elements, such as extra semicolons and type qualifiers. They also addressed missing virtual destructors in several classes, and updated the code to use modern C++ features like explicit constructors. Additionally, they converted macros into an enum and renamed a member function.
cryptographycppxrpldaemonblockchain
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