I am a Senior Security Software Engineer at Etsy.
Before that, I was a Senior Software Engineer at Apple and at Yelp.
I am a Recurse Center'14 alumni (former Hacker School).
I have been hacking, coding, and using Linux since high school. Then one year I went to DEF CON and found weirdos like me. I also presented a talk on quantum cryptography there once.
My book in Python and Algorithms has been used by many around the world. Recently I signed with Hanbit Media, Inc. to have it translated to Korean.
I build tools focusing on Network Security, Cloud & Containers Security, and Machine Learning & Deep Learning in Security.
I have done research in places such as Los Alamos, BNL, and NASA.
My book in Group Theory is now used as text book by graduate students around the world, including at CALTECH.


  • If you are a physicist, this is the singularity I am talking about. If you are a computer scientist, then it is this. They are equally fascinating. ☺
  • My PGP: 145A 15D9 3393 4416 F7EA 0B9E E26F 1C8E 27D9 8506.
  • License: This blog is licensed under the Creative Commons Attribution-Noncommercial 3.0 license.
  • Opinions are my own and not the views of my employer.
  • Kindness is wisdom.
  • Impossible is just another state of mind.