# Yaxin Lei > Sr Software Engineer at Tesla; always creating and building stuff Location: Berkeley, California, United States Profile: https://flows.cv/yaxinlei ## Work Experience ### Senior Software Engineer @ Tesla Jan 2024 – Present ### Software Engineer @ Tesla Jan 2023 – Jan 2024 | Palo Alto, California, United States ### Software Engineer @ Meta Jan 2022 – Jan 2022 ### Software Engineer Intern @ Facebook Jan 2021 – Jan 2021 | Menlo Park, California, United States ### Machine Learning Engineer @ Levi Strauss & Co. Jan 2020 – Jan 2020 | San Francisco Bay Area - Designed and implemented the backend data-pipelines of real-time monitor application on product supply demand, facilitating the analysis work of data scientists and internal planners; - Implemented advanced clustering algorithms on products and sales data for data analysis, product similarity grouping, and model improvement purposes; - Launched multiple time series prediction models into production, improving internal MAPE metrics by 15-20% for Levi's and Docker's products across North America (using LSTM, DeepAR, Prophet, XGBoost etc); ### CS 70 Content Creation/Course TA @ UC Berkeley Electrical Engineering & Computer Sciences (EECS) Jan 2019 – Jan 2020 - Created content for midterms, final exam, homework and discussion worksheets for CS70; - Led discussion sections and review session consistently through out the semester with high student satisfaction; - Facilitated the CS61A course staff through providing private tutoring sessions and contributing in review sessions. ### Data Science Intern @ Himalaya Jan 2019 – Jan 2019 | San Francisco Bay Area - Monitored user retention rate and behavior anomaly, and conducted in-depth analysis on user behavior and second-day retention rate with large-scale realtime online user IOS/Android data metrics; - Delivered a new marketing strategy with detailed analysis for promising/bottlenecked channels and contents on the podcast platform; - Examined possible data pipeline fallacies and data discrepancies across databases as well as verified conjectures for new App feature towards user behaviors. ### Undergraduate Researcher, Statistics Department @ University of California, Berkeley Jan 2018 – Jan 2019 | Berkeley, CA - Conducted research on existing random number generators and analyzed flaws and weaknesses; - Built high quality reproducible pseudo random number generator python package structured upon user generated seed and cryptographic SHA-256 hashing functions; - Restructured the package using C to enhance speed, while guaranteeing high level of randomness. ### Professor Assistant and Course Grader @ University of California, Berkeley Jan 2018 – Jan 2019 | Berkeley - Guided 40 students on their semester long research projects in Soc 150 Social psychology focusing on topics including identity change, identity perception and social relationships; - Facilitated the Social Psychology course by providing feedback on and grading research papers, field reports and homework; - Helped the professor with course logistics and hosted office hours. ### Founding Member and Course Facilitator @ Sutardja Center for Entrepreneurship and Technology Jan 2018 – Jan 2019 | Berkeley, CA - Founded and Facilitated the "Decode Silicon Valley Startup Success" course under UC Berkeley's Sutardja Center for Entrepreneurship & Technology - Developed the semester-long course's content and structure focusing on concrete steps of building a startup with more than 100 students enrolled ### Chief Designer and Head of Creative Marketing @ Berkeley China Forum Jan 2016 – Jan 2018 | UC Berkeley - Responsible for all the Graphic design works, including Brochure design, Ticket and Flyer design, T-shirt design and social media marketing. - Devised creative marketing strategies across all social media platforms ### Apprentice Researcher @ UC Berkeley College of Letters & Science Jan 2016 – Jan 2018 | Berkeley, CA - Researched on privacy literacy in UC Berkeley Privacy Literacy Lab (founded by PhD Naniette Coleman, advisor Professor Heather Haveman) for over two years - Improved privacy literacy through writing blog posts, wikipedia and constructed a database for privacy related annotated bibliography - Utilized technical skills for web scraping and data cleaning related to privacy literacy ### Digital Design and Marketing Intern @ Rokid Corporation Ltd Jan 2017 – Jan 2018 | Fremont, CA - Led the product launch as a core digital media designer for Rokid at 2018 Consumer Electronics Showcase (CES) - Published extensive market research internally on AR/VR glasses industry - Facilitated design and marketing work during the Rokid GLASS launching period ### UI & UX Designer @ Ez Essay Jan 2016 – Jan 2017 | Greater Los Angeles Area Ez Essay is an education company based in LA, CA. I was responsible for the UI/UX design for the company's EzEssay app. This app will be publicly released in Apple Store during April, 2017. Several specific responsibilities are: - doing market research and customer behavioral research - prototype and develop a thorough logic for the app - responsible for the UI and UX design of the companies app - formal in-person usability tests based on past users - marketing campaigns ### Logo designer @ TEDx Berkeley Jan 2017 – Jan 2017 | Berkeley, CA ### Graphic Designer (form Lux Board) @ Walnut Technology Limited Jan 2016 – Jan 2016 | Berkeley Completed the Info Graph, Logo, and UI design for Lux Board, a electric skateboard startup company in Berkeley, California. Current ways of transportation: - Bicycles/scooters: Cons: Heavy and not very portable; easily stolen. Pros: Green and accessible. - Cars: Cons: Parking difficulties, expensive, and uses gas. Pros: Efficient transport, long-distance capability. - Bus/Shuttle: Cons: Not convenient due to schedule. Pros: Relatively inexpensive. - Ride-sharing: Cons: expensive (per ride payment basis). Pros: on-demand and comfortable. What LUX board does is to provide a clean, safe, cheap and convenient alternative to the 1st mile problem by using a combination of carbon fiber and kevlar. With sufficient improvement, it has now been renamed Walnut Technology. ## Education ### Master of Science - MS in Computational Science and Engineering Harvard University Jan 2020 – Jan 2021 ### Bachelor's degree in Computer Science, Statistics, Sociology University of California, Berkeley Jan 2015 – Jan 2019 ### Bachelor of Arts - BA in Statistics University of California, Berkeley Jan 2015 – Jan 2019 ### Bachelor of Arts - BA in Sociology University of California, Berkeley Jan 2015 – Jan 2019 ## Contact & Social - LinkedIn: https://linkedin.com/in/yaxin-lei-951945119 --- Source: https://flows.cv/yaxinlei JSON Resume: https://flows.cv/yaxinlei/resume.json Last updated: 2026-03-23