Jianfeng Wang, Ad Serving Developer in Sunnyvale, CA, United States
Jianfeng Wang

Ad Serving Developer in Sunnyvale, CA, United States

Member since May 14, 2016
Jianfeng has over 10 years of experience as a full-stack engineer with a focus on back-end systems. He's worked at both big companies like Oracle, Yahoo, a few small startups, Adify, and GrowMobile. He has built scalable web apps, ad serving systems, and AWS management systems.
Jianfeng is now available for hire




Sunnyvale, CA, United States



Preferred Environment

GitHub, Sublime Text, Ubuntu, MacOS

The most amazing...

...thing I've built is GrowMobile, from scratch to launch in 6 months. The system serves 100M daily requests, generating $10+M in revenue in the first year.


  • Funding Engineer, Core Developer

    2012 - 2015
    GrowMobile (Acquired by Perion)
    • Built the majority of the product from scratch before the acquisition.
    • Created the dashboard using Ruby on Rails to all advertisers managing campaigns, with reports for viewing. The UI is Twitter Bootstrap.
    • Developed the back-end with API integration to 100+ ad networks, an attribution server to track ad clicks, app installation, and real-time attribution. Used MongoDB as the data ingest store, and Vertica as a data warehouse for the reporting and analysis.
    • Managed 100+ servers in AWS and handled most operations including Bootstrap servers, deployment, monitoring, backup/restore MongoDB, and load balancing.
    • Built an RTB server using Go.
    • Created a mobile client SDK (Android, iOS, Unity).
    Technologies: Amazon Web Services (AWS), MySQL, Vertica, Redis, MongoDB, Ruby on Rails (RoR), Ruby
  • Senior Engineer, Manager of Back-end System

    2006 - 2010
    Adify (Acquired by Cox)
    • Built portions of Adify, an ad-serving technology platform to power and service vertical online ad networks.
    • Designed and implemented a reporting engine including UI and back-end data pipeline.
    • Implemented a billing and payment system.
    • Implemented campaign/account management.
    Technologies: .NET, SQL, C#
  • Lead Engineer

    2005 - 2006
    • Designed and implemented a back-end framework for Yahoo! Health/Lifestyle property using PHP.
    Technologies: MySQL, PHP
  • Lead Engineer

    2000 - 2005
    Siebel System (Acquired by Oracle)
    • Created a field service scheduler/appointment booking engine using C++.
    • Owned the assignment engine as a common component for entire Siebel vertical of applications using C++.
    • Built the field service dashboard module with Gantt chart to manual a schedule of field engineers.
    • Created parts of the Siebel Call Center application and the Siebel sales application.
    Technologies: C#, Java, C++


  • SwordWind: Kids Safety Product on Android

    Mobile App to track kids location, app usage, rule setting (school hours, total hours of app usage, permission on certain apps). Parents can view reports and receive alerts.

  • Wire2PI

    RealTime Video/Audio streaming from your Raspberry PI, based on WebRTC

  • Android Casual Game

    Mobile Game on Android.


  • Languages

    Python, Java, Ruby, C++, C#, PHP, SQL, Go
  • Frameworks

    Ruby on Rails (RoR), Bootstrap, Django, .NET
  • Tools

    Git, Sublime Text, GitHub
  • Platforms

    Linux, Android, MacOS, Ubuntu, Amazon Web Services (AWS)
  • Storage

    Redis, MongoDB, MySQL, Vertica
  • Other

    Ad Serving
  • Paradigms

    Agile Software Development


  • Master's Degree in Computer Engineering
    1997 - 2000
    Vanderbilt University - Nashville
  • Master's Degree in Eletrical Engineering
    1994 - 1997
    Tsinghua University - Beijing China

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