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john_at_harmon.hk

I do freelance, contact me at john_at_harmon_hk

• Programming
  • firmwares / embedded
    • STM8
    • AVR
    • Arm Cortex-M
      • Standalone / FreeRTOS
    • Arm Cortex-A
      • u-boot
      • linux kernel driver
  • desktop / mobile / user-space software see below
• Electronic Engineering (Eagle PCB / Cadance/Orcad )
  • I touched every product of HeadacheSound
    • 80% GA1.1
    • 60% PBA1
    • 50% OMNI
  • Most electronics for Oblisk Soundwork
  • Raspberry Pi CM4 "motherboard"
    • HDMI signals
    • PCIe / m.2 signals
    • 1GBASE-T switches
  • USB-PD 20V multiport charger
  • Given datasheets and specs I am confident to play with DDR layouts
• Product Engineering (Solidworks)
  • OMNI (HeadacheSound)
    • Plastic moulding
    • Metal CNC
  • PC Cases
    • Sheet-metal
    • Fasteners mechanisms
  • Analog Watches

I write mostly back-end but front-end is also capable.

• Android JAVA
  • sorry no Kotlin experience
• C/C++
• iOS Swift
• C#
• Python3.9
• Javascript / Typescript / HTML5 / CSS3
• .net core
• ASP.net
• VB6/ASP classic

I write many native codes, recent years I do many audio processing, Fresher from HeadacheSound is one of my work.

I do machine learning from 2021, not "top-notch", but definitely have experience.

• sklearn pipelines
• Boost/Bagging algorithm
• Tensorflow / Pytorch