Jiayu Chang

Security Engineer - D&R at MongoDB

Greater Chicago Area

About

Experience

  • MongoDB (Full-time · 5 yrs 4 mos)
    • Staff Information Security Engineer
      Sep 2025 - Present · 10 mos

    • Senior Security Engineer - D&R
      Mar 2021 - Sep 2025 · 4 yrs 7 mos

  • Information Security Engineer at Citadel
    May 2016 - Mar 2021 · 4 yrs 11 mos

    • Created Internet edge network topology diagrams from security perspective for all major sites and their data centers, providing a clear overall picture of our network design for internal reference and external auditing. • Migrated desktop users in 12 office locations directly to OpenDNS, actively responded to any related issues and successfully handled an incident of DNS resolution failure during migration. Significantly improved the visibility of malware and botnet DNS requests (to 95%). • Fixed health errors/access issues on existing security monitor tools, documented/corrected the corresponding team Wiki pages. Created an automate weekly configuration backup process and performed patching for all devices to keep them at the latest OS versions. • Coordinated with other teams to migrate our monitoring devices (NetWitness, SourceFire, FireEye, etc.) from legacy environment to UCS cloud.

  • DePaul University (1 E. Jackson Chicago, IL 60604)
    • CDM Student Ambassador
      Jun 2015 - May 2016 · 1 yr

      • Answered questions from prospective and new students in person and over email • Welcomed attendees and answering questions at New Graduate Student Reception and various occasions

    • Course Online Technician
      Sep 2015 - Mar 2016 · 7 mos

      • Performed thorough maintenance in Course Online teaching facilities • Troubleshot hardware/software related issues and found timely and effective solutions • Provided prompt, courteous and detailed telephone help desk support and in-class support for students, faculty, lab assistants and campus administrators

  • Graduate Assistant at DePaul University
    Jan 2015 - Mar 2015 · 3 mos

    • Worked as a grader for Fundamentals of Information Assurance course • Graded promptly and accurately lab reports related to using various tools in security management