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NYSE: TRIO 61.84 down −0.47 (−0.75%) Close 2 Nov 2026

Write and test the embedded firmware of the AccessNet K-Series, the access controllers on 1.1 million doors.

About the role

The AccessNet firmware team is twenty-six engineers in Halsworth and Bengaluru. We keep the K-Series secure, fast and compatible with every AccessNet code table back to 1993.

What you will do

  • Develop features and security fixes in C for K-Series controllers.
  • Maintain compatibility with legacy code tables and back boxes.
  • Write and run hardware-in-the-loop tests.

What you will bring

  • Strong embedded C on microcontrollers.
  • Experience with cryptographic protocols on constrained devices.
  • A healthy suspicion of default settings.

Equal opportunity

TriOptimum is an equal opportunity employer. We consider every applicant on their merits, without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status or any other characteristic protected by law. If you need an adjustment to apply or interview, tell us and we will make it.