[Hiring] Senior Edge Engineer @SJE Inc.

Role Description

As our Senior Edge Engineer , you will be the team’s depth on bare-metal firmware. Day-to-day that means:

• Secure boot, signed firmware, MQTT-over-TLS to the cloud, and the field-side protocol layer (Modbus RTU, plus CAN bus where required) on our current ARM Cortex-M class device.
• Work into the team’s embedded-Linux track as our next-generation gateway platform comes online.
• Provide occasional mentorship of early-career engineers on cross functional firmware teams within the organization.

Your primary responsibilities will be:

• Security uplift on the current device platform: Secure boot, signed firmware images, hardware-rooted key storage (a secure-element companion or equivalent), verified OTA.
• A time-boxed feasibility study on cloud protocol: Determine whether MQTT-over-TLS with mutual auth fits on the existing MCU: footprint, RAM/flash budget, TLS-stack viability.
• The field-side protocol layer: Modbus RTU primary, CAN bus where required. Clean driver abstraction for adding new field protocols.
• OTA strategy and safety: Bench validation, staged rollouts, rollback, recovery.
• Provisioning and identity: Per-device mutual-TLS credentials, secure key injection at manufacturing, key rotation.

Qualifications

• Experience with reading Modbus RTU timing diagrams on an oscilloscope.
• Debugging a stuck mutual-TLS handshake on a constrained MCU.
• Pulling a bricked unit back over JTAG.
• NXP toolchains (hands-on) or equivalent vendor environments.
• Production work on secure boot chains, signed firmware, and verified OTA on resource-constrained devices.
• Integrating hardware secure elements (Microchip ATECC608, Infineon OPTIGA Trust, or similar).
• TLS/MQTT on constrained MCUs: mbedTLS, WolfSSL, or comparable.
• Modbus RTU on bare metal: RS-485 driver, interrupt timing, framing.
• Working at the bench: oscilloscope, logic analyzer, JTAG/SWD debug, signal-level diagnosis.
• Embedded firmware (7+ years), fluency in C and modern C++ on ARM Cortex-M class microcontrollers.

Requirements

• Bonus qualifications:
• CAN bus on bare metal.
• Industrial cert experience (FCC, CE, UL).
• Manufacturing test fixture or test program design.
• Industrial or critical-infrastructure deployment experience.
• Yocto, Buildroot, or other embedded-Linux exposure.
• A 4-year degree in Computer Engineering, Computer Science, Electrical Engineering or equivalent degree and 7-10 years of experience are required.

Benefits

• Up to 120 hours of Paid Time Off in your first year plus 8 paid holidays.
• Robust benefits package including health, life, short-term and long-term disability insurance, dental and vision programs.
• Other benefit options available.