JJ is a Senior Security SWE at Google's Android Security & Privacy team where he is developing tools to fight abuse in Android with focus on JavaScript-based frameworks. He has also designed CTF challenges and helped organize GoogleCTF in the past few years. Before Google, he was a Cybersecurity researcher at iSecLab and earned his PhD in Cybersecurity from Northeastern University, Boston, MA. Some domains he is active in are large-scale web security & privacy measurement, program analysis, and Malware detection.