Derek Cao

Software Programmer at DigitalStar.ca
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Contact Information
us****@****om
(386) 825-5501
Location
CA

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Experience

    • Canada
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • Software Programmer
      • Jan 2022 - Present

    • Canada
    • Retail
    • 1 - 100 Employee
    • System Analyst
      • May 2020 - May 2021

      Price compare system: designed a price compare system between different couriers , this system helped our company saved lots of money; Picker system: designed a picker system for warehouse, this system help warehouse to save picking time ; Language translate system: designed this system for French language searching, freelancer can use this system to help our company translate the product description easily. Route planning system: designed this system for our local delivery team ,we use this system to reduce the distance in different areas. Show less

    • Canada
    • IT Services and IT Consulting
    • Software Engineer
      • Feb 2019 - Dec 2019

      Hikvision Recorder Download: Used C++ STL, Hikvision C++ SDK and AWS C++ SDK developed this application. It supported in windows and Centos, this application was multithread and used AWS SQS and S3; Video transcode: transcoded video then uploaded to AWS S3, every school we must handle almost 200G video file and must upload these files to AWS s3 in 24 hours, so the code must be used code in multithread; Send WeChat Message: used Django to handle WeChat messages and sent message to customers; Time Schedule: Developed a windows tools to run process at some time based on C++, this application was in multithread mode; Show less

  • Guangdong Wang Jin Holdings Co., Ltd.
    • Guangzhou, Guangdong, China
    • Develop Manager
      • Aug 2015 - Dec 2018

      Design and Develop the ‘E+ Accounting System’ For the China Merchants Bank, Consumed 10 million trades every business day (Java, Spring JDBC template, SQL Server ,C# , Tfs) Design and Develop the ‘E Link Enterprise System’ For the medium-sized and small enterprises , About 30 customers join the system (C#,SQL Server ,SVN) Design and Develop the ‘E+ Accounting System’ For the China Merchants Bank, Consumed 10 million trades every business day (Java, Spring JDBC template, SQL Server ,C# , Tfs) Design and Develop the ‘E Link Enterprise System’ For the medium-sized and small enterprises , About 30 customers join the system (C#,SQL Server ,SVN)

  • Cell Communications Technology Co., Ltd.
    • Guangzhou, Guangdong, China
    • Software Engineer
      • Jul 2000 - Jul 2015

      • Managed UDP (User Datagram Protocol) in Excel Switchboard to realize VoIP ( Voice Over Internet Protocol) of Excel Switchboard in accordance with OPENH323; • Developed fax server based on API (Application Programming Interface) of dialogic to realize fax sending from PC to Phone; • Developed CTI (Computer Telephony Integration) based on C++ in Window and Linux environment to realize the management of calling center, develop Voice Platform based on NMS/Telcobridge API by utilizing Red Had Linux C++ to realize IVR (Interactive Voice Response), conference and other functions; • Lead and completed coding of ACC CODEC (Coder and Decoder) in IOS & Android system, the development of SIP (Session Initiation Protocol) Protocol Stack based on C++, project supervision of World University Game held in Shenzhen • Developed video conference system, collected original video stream from the ip camera, and the video stream is encoded and compressed by RTSP or RTMP transmission. Designed and developed: .1 the ‘Cell Call Center’, complete the Acd/Acm module to communicate to the agents and the CTI Service (C++) .2 the video conference system ,use the open source code ‘ffmpeg ’ to compile the video stream and audio stream ,also use the ‘live555’ and ‘rtmp ’ to transfer the video and audio stream (C++、ffmpeg ,live555,rtmp) .3 the live camera video system for mobile device, decode the H.264 video stream (C++, JNI, FFMPEG) .4 the ‘Foshan 12345 System’ for Foshan government, Consumed 5 million calls every day, about 100 agents (C++, NMS, JSP) .5 the ‘Sip Phone’ for Luogang district government it communicate to the sip gateway to call mobile phone (C++) Show less

Education

  • South China University of Technology
    MSC in Computer Techniques
  • Ocean University of China
    Bachelor in Electronics and Information System

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