Haijiang Zeng

Experience

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  Longfor Properties Co. Ltd

  Jan 2019 - Apr 2019

  Machine Learning Engineer

  • Conducted machine learning in Python in establishing investment mapping model based on 40+ factors and with the fitting rate reaching 90%.• Improved iterative models and table relationship in SQL databases. Wrote queries and indexes to update weekly. • Leveraged ARIMA model and HP filter analysis to predict and optimize sales of different construction plans.

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  Daimler China

  Jul 2019 - Sept 2019

  Business Intelligence Engineer

  • Developed OCR (Optical Character Recognition) programming to collect data automatically from scan-copied China VAT invoices. Reached 87.3% success rate from 237 invoices.• Contributed in building RPA (Robotic Process Automation) based on decision trees for the Controlling Department. Shortened the approval time by 33%.• Utilized ARIMA model for forecasting employees’ demission rate and sales data. MAPE is lower than 5%. • Designed data life cycle for internal data platform from initial generation to daily usage scenarios such as analytics and visualization. Show less

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  Tencent

  Apr 2020 - Sept 2020

  Product Analyst

  · Conduct cutting-edge research in the game field and interpret user-side and industry-side changes. Two research reports have been pushed into Tencent.· Conduct business topic research, including demand research and analysis, gameplay disassembly, circle segmentation, etc., to provide decision support for product application and landing.

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  Kuaishou Technology

  Aug 2020 - Apr 2021

  · Establish a DAU estimation model to provide data support for user growth plans and division of labor, and the MAPE is less than 2.5%.· Use Hive SQL to provide data support to product, operation and user research teams, including AB testing, dashboard building, abnormal attribution, etc.· Daily market data monitoring and reporting, and timely attribution of changes in various indicators.· Write user growth research reports, among which a special analysis of Chinese celebration activities excavated 5 types of high conversion rate video tags and 242 high-value creators. Show less

  • Data Scientist in E-commerce Operation

    May 2020 - Apr 2021

  • Data Scientist in User Growth

    Aug 2020 - Dec 2020
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  Oceans

  Jun 2021 - May 2022

  Data Scientist

  · Establish an evaluation system including 42 indicators for the construction of investment database.· Use python crawler to crawl data regularly and automatically update it into the database.· Based on NLP technology, finish keyword positioning and sentiment analysis for further evaluation.

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  Walmart

  Jul 2022 - now

  Senior Data Scientist