Cosmin Stejerean
Ffmpeg Whisperer at Meta
Las Vegas, Nevada, United States
Summary
🤩
Rockstar🎓
Top SchoolCosmin Stejerean is a seasoned software engineer with 18 years of experience specializing in large-scale video and audio processing, currently optimizing media quality at Meta as a self-styled "FFmpeg Whisperer." He has founded and led companies building distributed transcoding systems and served as CTO driving supply-chain software, combining hands-on engineering with business leadership. An active open-source contributor, Cosmin has patched and extended high-profile projects like Netflix's VMAF—adding a five-parameter logistic regression model and motion2 feature support—and improved tooling across DevOps and API clients. Based in Las Vegas, he brings deep backend and systems expertise across cloud, CI/CD, and media pipelines, plus practical security and performance sensibilities from earlier roles. Known for fixing subtle compatibility and memory issues, he pairs pragmatic bug-squashing with model-driven improvements that measurably raise perceptual video quality.
18 years of coding experience
9 years of employment as a software developer
MicroMasters Supply Chain Management, MicroMasters Supply Chain Management at Massachusetts Institute of TechnologyBachelor of Business Administration - BBA Business Administration Management and Operations, Bachelor of Business Administration - BBA Business Administration Management and Operations at Western Governors University
Stackoverflow
1,388reputation
185kreached
16answers
0questions
openssl
top-5%
compilation
top-5%
python
top-5%
Github Skills (52)
api-rest10
python10
apidoc10
restful-api10
django10
api-design10
scikit10
loadtest10
command-line-interface10
machine-learning10
java10
javas10
http-client10
aws10
api10
Programming languages (16)
Github contributions (5)
newsapps/beeswithmachineguns
Jan 2013 - Dec 2017
A utility for arming (creating) many bees (micro EC2 instances) to attack (load test) targets (web applications).
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:71 commits, 39 PRs, 37 pushes in 5 years
Contributions summary:Cosmin primarily focused on improving the functionality and maintainability of the `beeswithmachineguns` tool. They implemented features such as keep-alive connections and basic authentication, and added support for AWS GovCloud. Furthermore, they made improvements to the code, including fixing URL handling, validating parameters and removing unnecessary imports. The user also updated the project's dependencies.
instancesload-testweb-applicationsbeesec2
cosmin/stashy
Mar 2013 - Dec 2022
Python API client for the Atlassian Stash REST API
Role in this project:Backend Developer
Backend DeveloperContributions:96 commits, 84 PRs, 88 pushes in 9 years 10 months
Contributions summary:Cosmin primarily focused on developing the backend functionality of the stashy project, a Python API client for the Atlassian Stash REST API. Their contributions included adding Sphinx documentation for the project, updating existing documentation, and implementing new features related to repository hooks and tags. They also addressed bugs, improved the codebase, and added support for Python 3, indicating a strong understanding of the project's core functionality and its interaction with the Stash API.
api-clientapipythonstashapi-client-python
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