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Dennis Pacewicz

Software Engineer

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About

Software Engineer with experience delivering high-impact initiatives at global companies. Thriving in environments that require technical creativity and multidisciplinary collaboration to solve complex problems. Passionate about learning; everything from compiler design to sailing.

Experience

  • GitHub

    February 2022 - Present
    • Senior Product Security Engineer
    github.com
    Technical lead within the Product Security Engineering team, specializing in architecting secure "paved paths" across the SDL to scale systemic protections while enhancing developer experience.
    • Ruby
    • Rails
    • React
    • Copilot
    • Actions
    • Kubernetes
    • CodeQL
    • Kusto

  • Shopify

    January 2017 - August 2022
    • Senior Developer (2021 - 2022)
    • Developer (2018 - 2021)
    • Developer Intern (2017)
    shopify.com
    Core contributor to Shopify's App Systems and Theme Store, focused on enabling platform growth while maintaining merchant security and trust.
    • Ruby
    • Rails
    • React
    • GraphQL
    • MySQL
    • Elasticsearch

Community

  • RubyKaigi

    April 2025
    • Featured Speaker - RubyKaigi 2025 (Matsuyama, Japan)
    rubykaigi.org
    Co-authored and presented "Keeping Secrets: Lessons Learned From Securing GitHub" alongside security researcher Wei Lin Ngo.

    • Hack the 6ix

      August 2017 - December 2019
      • Director of Engineering
      hackthe6ix.com
      Led the engineering team for Toronto’s largest hackathon, growing the team and building out custom event management tooling, supporting 1000+ hackers.

      Education

      • University of Ontario Institute of Technology

        2013 - 2018
        B.Sc. in Computer Science

      Interests

      • Outdoors

        • Sailing
        • Backwoods camping
        • Mountain biking

      • Creative

        • Music production
        • 3D modelling
        • CNC / Digital manufacturing