Chaim Halbert
Senior Software Engineer at American Express
Phoenix, Arizona, United States
Summary
👤
Senior🎓
Top SchoolChaim Halbert is a Senior Software Engineer with 12 years of professional experience and decades of hands-on programming fluency honed from a UC Berkeley Computer Engineering background. He specializes in backend systems and cloud migrations, shipping long-lived Go-based architectures and tooling across companies like Evernote, Bank of America, Amazon, and now American Express. Comfortable across a wide polyglot stack (Go, Ruby on Rails, Python, JavaScript/Node, Java, Bash and many C-family languages), he pairs systems-level problem solving with pragmatic automation—converting Terraform workflows into idempotent Go programs and training teams on golang best practices. An active open-source contributor, he’s improved pyenv’s macOS build stability and implemented performance and API enhancements to a self-balancing interval tree, reflecting attention to compatibility, memory alignment, and algorithmic efficiency. Based in Phoenix, AZ, he brings a rare blend of enterprise-scale production experience, low-level build/system insight, and a history of shipping developer-facing tools that make teams faster.
12 years of coding experience
10 years of employment as a software developer
Bachelor of Science (BS) Program Computer Engineering, Bachelor of Science (BS) Program Computer Engineering at University of California, BerkeleyHigh school diploma honors, High school diploma honors at Hume-Fogg Academic High School
English, German, Hebrew, Yiddish, Japanese
Stackoverflow
2,284reputation
888kreached
21answers
5questions
unicode
top-5%
regex
top-5%
javascript
top-5%
parsing
top-5%
Github Skills (33)
algorithm10
algorithms10
set-operations10
python10
data-structure10
performance-optimization10
data-structures10
macos10
shell10
javascript9
unit-testing9
regex9
c119
build-system9
unicode9
Programming languages (18)
Github contributions (5)
chaimleib/intervaltree
Mar 2014 - Apr 2021
A mutable, self-balancing interval tree. Queries may be by point, by range overlap, or by range containment.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 releases, 2 reviews, 495 commits in 7 years 2 months
Contributions summary:Chaim primarily contributed to the core functionality of the interval tree data structure, adding features such as new query methods, set-like operations, and performance improvements. Their work involved refactoring existing code, adding new methods to manipulate the interval tree, and improving the efficiency of existing search functions. The user also focused on creating a more user-friendly and versatile API for interacting with the interval tree.
data-exchangecontainmentrustkd-treeinterval
pyenv/pyenv
Jan 2019 - Feb 2023
Simple Python version management
Role in this project:Back-end Developer & System Architect
Back-end Developer & System ArchitectContributions:1 review, 2 PRs, 2 comments in 4 years 1 month
Contributions summary:Chaim contributed to the project by addressing build and configuration issues related to the underlying system. They implemented changes to improve compatibility with newer compilers and operating system versions, particularly on macOS. These modifications involved adjusting the build process and adapting code to prevent configuration errors. Further, they worked on memory alignment and garbage collection, improving the stability and efficiency of the project.
python-version-managementpythonpython3version-managementshell
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