Joel Johnson
Staff Software Engineer at Hipp Health
Atlanta, Georgia, United States
Summary
🤩
Rockstar🎓
Top SchoolJoel Johnson is a Staff Software Engineer with 14 years of experience specializing in performance, algorithms, language design, compilers, and math, primarily using C++, Python, and Ruby/Rails. He has progressed from CAD and embedded-style performance work to leading core engineering teams at fintech and health tech companies, currently driving engineering at Hipp Health after six years at Omada Health. Joel contributes to open source tooling for observability—his work on rbspy improved sampling flexibility, subprocess support, and Unicode-safe flamegraphs—reflecting a practical focus on profiling real-world systems. He combines low-level C++ template expertise with high-productivity Ruby and Python development, making him effective across tooling, backend services, and platform performance. Colleagues rely on him to tackle tricky fidelity and validation problems that surface only under scale or in mixed-language stacks.
13 years of coding experience
18 years of employment as a software developer
Bachelors, Computer Science, Bachelors, Computer Science at Middle Tennessee State University (MTSU)
Stackoverflow
11reputation
486reached
1answer
2questions
Github Skills (22)
command-line-interface10
profiling10
command-line10
rust10
cli10
data-structure9
performance-monitor9
performance-analytics9
algorithm9
algorithms9
performance-measurement9
performance-monitoring9
performance-analysis9
data-structures9
performance-tuning9
Programming languages (12)
Github contributions (5)
rbspy/rbspy
Jan 2018 - Feb 2020
Sampling CPU profiler for Ruby
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 15 commits, 11 PRs in 2 years
Contributions summary:Joel contributed to the core functionality of the `rbspy` profiler. Their work included adding features like sample rate and duration controls to the record subcommand, enhancing the tool's flexibility. They also implemented input validation for filenames and integrated support for subprocesses, expanding the scope of the profiling capabilities. Additionally, they fixed fidelity issues in flamegraph SVGs and added a test to verify unicode support within the project.
cpurustrubycpu-profilerprofilers
liaden/dotfiles
Apr 2015 - Aug 2023
Contributions:80 pushes in 8 years 5 months
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