John O'Sullivan

Senior Backend Engineer at ZTX
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Contact Information
us****@****om
(386) 825-5501
Location
Chicago, Illinois, United States, US
Languages
  • English -
  • Spanish Limited working proficiency

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Daniel Posthuma

One of the core values on our team is to

Regina C.

You can count on John. His reliability, consistency, and speed-of-problem-solving make John a dazzling treasure of a dev ops engineer. I lost track of the number of times John effortlessly tackled a (seemingly) insurmountable systems issue; indeed, he helped to devise and maintain a secure CICD pipeline for our company’s complex micro-services platform. You can also count on John for passionate conversation about….well, anything. He expresses genuine interest in nearly everything – from cryptocurrency to global politics to cherry trees in Croatia. I am fortunate to have worked with John for the past year at Brighthive. Others should consider themselves lucky to say the same.

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Credentials

  • AWS Certified Solutions Architect – Associate
    Amazon Web Services (AWS)
    Jan, 2021
    - Sep, 2024

Experience

  • ZTX
    • Singapore
    • Mobile Gaming Apps
    • 1 - 100 Employee
    • Senior Backend Engineer
      • Mar 2023 - Present
  • Loyola University Chicago
    • United States
    • Higher Education
    • 700 & Above Employee
    • Instructor
      • 2018 - Present

    • Graduate Teaching Assistant
      • Aug 2017 - Jun 2018

      I work as a teaching assistant for the Computer Science department at Loyola. My duties require grading homework, projects, and exams; assisting students with questions or difficulties regarding class material during office hours; and periodic lecturing of class material. Thus far, I have been a TA for "Intro to Object Oriented Programming" and "Data Structures."

  • ConsenSys
    • Information Technology & Services
    • 1 - 100 Employee
    • Backend Engineer - Infura
      • Sep 2021 - Feb 2023
  • BrightHive
    • United States
    • Data Infrastructure and Analytics
    • 1 - 100 Employee
    • Software Engineer
      • Apr 2020 - Sep 2021
  • imbrex
    • Canada
    • Mechanical Or Industrial Engineering
    • Software Engineer
      • May 2018 - Jul 2020

    • Senior Software Engineer
      • Dec 2019 - May 2020

  • National Association of REALTORS®
    • United States
    • Real Estate
    • 700 & Above Employee
    • Software Developer
      • Jun 2017 - Sep 2017

      I was a member of the Center for Realtor Technology (CRT) Laboratory. I managed and updated the Smarthome checklist web application for realtors and members. For the bulk of my time, I created a web application using Preact, a lightware version of React, to interact with and present environmental data from hardware developed in CRT Lab known as Rosetta Home, an open source home automation system. The GitHub repository for Rosetta Home can be viewed here: https://github.com/rosetta-home/rosetta_home Show less

  • Argonne National Laboratory
    • United States
    • Research Services
    • 700 & Above Employee
    • Researcher
      • May 2015 - Aug 2016

      As an intern in the Mathematics and Computer Science (MCS) division, I worked on the Portable, Extendable Toolkit for Scientific Computation (PETSc) and Scientific Application Web Server (SAWS) projects. PETSc is a scientific library for running high-level computation experiments in physics, chemistry, and engineering. SAWS allowed PETSc to be interfaced through the web browser. The project can be viewed here: https://www.mcs.anl.gov/petsc/ As an intern in the Mathematics and Computer Science (MCS) division, I worked on the Portable, Extendable Toolkit for Scientific Computation (PETSc) and Scientific Application Web Server (SAWS) projects. PETSc is a scientific library for running high-level computation experiments in physics, chemistry, and engineering. SAWS allowed PETSc to be interfaced through the web browser. The project can be viewed here: https://www.mcs.anl.gov/petsc/

    • Mobile App Developer
      • Jul 2014 - Aug 2014

      I developed the Xamarin.Android mobile app known as "Here For You" for the Student Wellness Center at Loyola University Chicago. This is an app which provides college students information about how to report sexual assault or domestic violence to both the school and outside authorities, as well as what can be expected in the process of each report. The application details everything from signs of abuse (from a third party perspective) to the procedures done in a rape kit and links the user to nearby hospitals for optional counseling. The Android application can be seen on the Google Play store here: https://play.google.com/store/apps/details?id=edu.luc.mobile.HereForYou&hl=en Show less

Education

  • Loyola University Chicago
    Master of Science - MS, Computer Science
    2016 - 2018
  • Loyola University Chicago
    Bachelor of Science - BS, Computer Science
    2013 - 2017

Community

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