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Janus Varmarken

I am currently working as a software engineer at Juniper Networks. I did my PhD at UC Irvine, where I worked under the guidance of Professor Athina Markopoulou.


University of California, Irvine

My research was on network fingerprints, and on how smart home devices affect user privacy. I was advised by Professor Athina Markopoulou. I was selected for the Networked Systems Fellowship.

IT University of Copenhagen

  • MS in Information Technology
  • Graduated June 2017 with a GPA of 9.60/12.0
  • Copenhagen, Denmark

My Master Thesis, A Software Platform for Patient-Controlled Oral Analgesia, was supervised by Associate Professor Erik Grönvall and co-supervised by Associate Professor Søren Debois.

IT University of Copenhagen

  • BS in Software Development
  • Graduated June 2013 with a GPA of 8.92/12.0
  • Copenhagen, Denmark

My Bachelor Thesis, Speeding Up Mobile Web Browsing on the Android Platform, was supervised by Professor Athina Markopoulou.


Work Experience

University of California, Irvine

  • Graduate Student Researcher
  • September 2017 – Present
  • Irvine, California
My research investigates how smart home devices’ use of the network impacts user privacy and includes:
  1. Large-scale studies of (i) advertising and tracking on smart TVs, and (ii) network fingerprints of smart TV apps;
  2. A methodology that automatically discovers patterns ("fingerprints") in packet exchanges between smart home devices and their cloud servers, which enables an in-network observer to infer user actions on these devices from the encrypted network traffic

Juniper Networks, Inc.

  • Software Engineer Intern
  • June 2021 – September 2021
  • Sunnyvale, California

Built a user experience predictor for Zoom meetings using data I crawled from the Zoom API. Also designed and implemented a service that translates IP unicast traffic to IP multicast traffic.

University of California, Irvine

  • Teaching Assistant
  • March 2020 – June 2020 & April 2019 – June 2019
  • Irvine, California

Teaching Assistant for Introduction to Computer Networks (CS 132 / EECS 148).

Symantec Corporation

  • Security Technology & Response (STAR) Intern
  • June 2019 – September 2019
  • Culver City, California

Worked on network traffic analysis using Swift and Rust.

IT University of Copenhagen

  • IT Employee (Research Assistant)
  • December 2015 – December 2015
  • Copenhagen, Denmark

Development of an Android application for controlling a custom-built wearable device. Bluetooth was used for communication.

University of California, Irvine

  • Visiting Junior Specialist II
  • September 2014 – January 2015
  • Irvine, California

Development of an Android application, AntMonitor, capable of monitoring all network traffic on an Android device.

Danish Maritime Authority

  • Student Worker (Programmer)
  • October 2013 – July 2014
  • Valby, Denmark

Development of e-Navigation systems, i.e. computer systems for vessel navigation with the purpose of increasing safety on board while simplifying the navigator’s job.

Hammerstad A/S

  • Programmer
  • March 2012 – September 2013
  • Herlev, Denmark

Programming websites and database tools in C#.