Mark Hahnenberg
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolMark Hahnenberg is a seasoned software engineer and technology leader with 15 years of experience, currently Head of Technology at Clay in New York. His career spans low-level systems work on JavaScriptCore at Apple and HHVM at Facebook to product and infrastructure roles at Nylas, Airtable, Meta, and Clay, giving him rare breadth from VM internals to scalable backend services. He combines a focus on performance and reliability with hands-on test automation—evidenced by contributions to the nylas/sync-engine that reduced flakiness and sped up tests by refactoring sleeps and mocking external services. A Carnegie Mellon computer science graduate, he brings both deep technical rigor and practical product-oriented engineering to mission-critical systems.
16 years of coding experience
13 years of employment as a software developer
Carnegie Mellon University
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (10)
test-automation10
testing10
pytest10
python10
gevent10
imap9
smtpd8
smtp8
smtps8
git7
Programming languages (5)
Github contributions (5)
nylas/sync-engine
Aug 2016 - Aug 2016
:incoming_envelope: IMAP/SMTP sync system with modern APIs
Role in this project:
Backend Engineer & QA Engineer / Test Automation Engineer
Backend Engineer & QA Engineer / Test Automation EngineerContributions:17 commits, 35 PRs, 73 pushes in 13 days
Contributions summary:Mark focused on improving the test suite for the `nylas/sync-engine` repository, primarily targeting performance and reliability. Their contributions included refactoring tests to reduce reliance on sleep statements, thereby speeding up test execution. They also mocked external services and data generation to isolate tests and improve execution speed, alongside fixing lint errors. Furthermore, the user addressed test flakiness by fixing or adjusting tests that used the `gevent.sleep` function and by refactoring tests to use a fixture to mock `gevent.sleep` and replace with more appropriate behavior, thus creating a more stable testing environment.
mailsmtpsyncincomingemail
nylas/mypy-tools
Oct 2017 - Nov 2018
A handful of tools for using mypy
Contributions:22 commits, 20 PRs, 35 pushes in 1 year 1 month
mypypython
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