Mark Lewandowski
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolMark Lewandowski is a Senior Software Engineering Manager in San Francisco with 15 years building and operating large-scale distributed systems, currently leading YouTube’s Video Metadata organization. He combines deep systems and data expertise—C++, Python, Spanner, MySQL/Vitess migrations, Hadoop/MapReduce, and NoSQL—to drive multi-year roadmaps, performance optimizations, and cost-saving platform migrations that reduced CPU and memory footprints at massive scale. A hands-on leader who hires, mentors, and defines career paths for teams of 15+, he’s also a Tier 2 oncaller responsible for production excellence across critical services. His background spans analytics-driven product decisions (A/B testing, Pandas, Redshift) and building realtime recommendation and notification systems. An early contributor to open-source tooling around time handling (Delorean) and a founding member of internal schema and core-entity working groups, he blends rigorous academic training (PhD ABD/MS/BS in CS) with practical, production-first engineering.
15 years of coding experience
1 year of employment as a software developer
BS, Computer Science, BS, Computer Science at Florida State University
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (6)
timed10
datetime10
dates10
timedelta10
datetimes10
python10
Programming languages (3)
Github contributions (5)
myusuf3/delorean
Aug 2015 - Apr 2016
Delorean: Time Travel Made Easy
Role in this project:
Back-end Developer
Back-end DeveloperContributions:46 commits, 8 PRs, 2 pushes in 8 months
Contributions summary:Mark primarily contributed to the improvement and maintenance of the `delorean` library, a Python library focused on time manipulation. Their contributions included fixing bugs, updating documentation, and adding new features like methods related to time zones. The user's work also involved refactoring code related to timezone handling and equality checks within the Delorean objects, indicating a focus on accuracy and usability. Furthermore, they have made improvements to the library's string parsing capabilities.
datetimepythontimedeltatravelphp
mlew/delorean
Aug 2015 - Aug 2015
Contributions:28 pushes, 17 branches in 18 days
travelphptime-traveldelorean
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.