Alexander Zielenski
Member Of Technical Staff at OpenAI
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolAlexander Zielenski is a software engineer with 12 years of experience building compilers, embedded tooling, and cloud-native infrastructure, currently a Member of Technical Staff at OpenAI after a multi-role tenure at Google. He is a prolific open-source contributor to Kubernetes core projects—apiserver, client-go, kube-openapi and kubelet-related tooling—where his work improved server-side apply, managed fields, testing, and OpenAPI generation. His background in low-level macOS/iOS tooling (optool, Mousecape) and past internships at Apple show deep systems and binary-format expertise alongside full-stack product instincts. A KubeCon EU 2024 speaker, he blends production-grade backend engineering with DevOps and release management, routinely modernizing dependency and build systems. Based in San Francisco, he pairs academic CS training from Cornell with hands-on experience in both large-scale distributed systems and embedded OS internals, often surfacing subtle correctness fixes that prevent no-op updates and timestamp regressions.
12 years of coding experience
12 years of employment as a software developer
Sparta High SchoolBachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at Cornell University
Stackoverflow
3,601reputation
223kreached
78answers
33questions
Github Skills (45)
dependency-management10
go-modules10
json10
objective-c10
kubernetes10
debug10
code-generator10
lib10
bit-manipulation10
apidoc10
architecture10
testing10
mach-o10
kubectl10
ui-design10
Programming languages (15)
Github contributions (5)
alexzielenski/Mousecape
Feb 2014 - Jun 2020
Cursor Manager for OSX
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:3 releases, 61 commits, 23 pushes in 6 years 5 months
Contributions summary:Alexander primarily contributed to the front-end of the project, making modifications to the UI and incorporating new features like options for left-handed users. They also addressed several bugs, fixing issues related to the display of applied capes and ensuring the application's stability. Furthermore, the user improved localization support and updated build settings, indicating involvement across different aspects of the project. Their work included changes to core files and views.
centerosxcursorspointercursor
alexzielenski/optool
Aug 2014 - Mar 2017
Command Line Tool for interacting with MachO binaries on OSX/iOS
Role in this project:Backend Developer
Backend DeveloperContributions:20 commits, 1 PR, 10 pushes in 2 years 8 months
Contributions summary:Alexander primarily focused on enhancing the functionality of the MachO binary interaction tool. Their contributions involved adding support for ARM executables and fixing 32-bit detection issues, indicating a deep understanding of binary structures and architectures. They also implemented features such as removing ASLR and code signatures and adding the capability to rename dylibs, thereby extending the tool's capabilities in manipulating MachO binaries. Furthermore, they introduced an experimental implementation related to dyld information modification.
command-line-toolosxbinariesutilityswift
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