Ji Pei
Engineering Manager at Notion
New York, New York, United States
Summary
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Senior🎓
Top SchoolJi Pei is an engineering manager with 11 years of experience building high-performance mobile and infrastructure systems at Notion, Instagram, and his own startup. He led and scaled Instagram teams from a single engineer to 26, driving app performance, reliability, and efficiency improvements that contributed over 15M DAU and measurable startup-level product wins like Stories, Reels, and Threads media pipelines. Technically grounded from roles building image, video, and network infra that handled >10B daily requests, he blends hands-on system design with people leadership across mobile, backend, and on-device ML. At Notion he now oversees product quality, mobile product and infra, and developer velocity for a ~40-person organization. Trained in electrical engineering and applied mathematics (Beihang; Columbia), he brings a quantitative, systems-oriented approach and founder sensibility to large product teams. Notably, his experience includes shipping state-of-the-art on-device ML for content prefetching that improved start time without harming engagement.
11 years of coding experience
10 years of employment as a software developer
Bachelor of Science (BS) Electrical and Electronics Engineering, Bachelor of Science (BS) Electrical and Electronics Engineering at Beihang UniversityMaster's degree Electrical and Electronics Engineering, Master's degree Electrical and Electronics Engineering at Columbia University
English, Chinese
Stackoverflow
1reputation
0reached
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Github Skills (6)
debug9
things9
debugging8
swift7
ios6
xcode5
Programming languages (1)
Github contributions (5)
iampgzp/catchRun
Dec 2014 - Aug 2015
Contributions:23 commits, 15 pushes in 8 months
iampgzp/Pong
Aug 2015 - Sep 2023
Contributions:2 pushes, 1 branch in 8 years 2 months
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