SJE Inc. logo
SJE Inc.

At SJE, we believe in empowering our employees to grow professionally while making a real impact. We offer competitive pay, excellent benefits, and a collaborative culture that encourages creativity and problem-solving. Join us and become a part of something bigger. Join a company where you’re not just working—you’re building a legacy!

Senior Edge Engineer

Location

United States

Posted

24 days ago

Salary

0

Seniority

Senior

Job Description

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.

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