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# Embedded Software / Firmware Engineer

- **Company:** 22nd Century Technologies, Inc.
- **Location:** Indianapolis, IN, United States
- **Contract:** Temporary to permanent
- **Skills:** Abstraction Layers, Application Programming Interfaces (APIs), ARM Architecture, Booting (BIOS), Continuous Integration, Software Debugging, Embedded C, Embedded Software, Firmware, Gecko (Software), Mesh Networking, Packet Analyzer, Real-Time Operating Systems, Wireless Sensor Networks, Universal Asynchronous Receiver/Transmitter, Serial Peripheral Interface, PIC Microcontroller, Wireless Devices, Git Flow, Bare Metal, Zigbee, U-Boot
- **Published:** November 5, 2026
- **Apply:** https://www.thejobnetwork.com/job/61eccb88-9ab5-4e96-bbcb-c130790a9e62/embedded-software-firmware-engineer

## About the Role

Key Requirement: Strong Embedded C and hands-on wireless communication experience (RF / Sub-GHz / Z-Wave)., * The ideal candidate should have hands-on experience developing embedded firmware for wireless devices, preferably using Silicon Labs EFR32 platforms and Z-Wave technologies.

Required Technical Skills

 * Strong proficiency in Embedded C (Mandatory).
 * Experience with bare-metal and RTOS-based firmware development.
 * Hands-on experience with ARM Cortex-M microcontrollers.
 * Understanding of interrupt-driven architectures.
 * Experience with DMA, timers, watchdogs, GPIO, UART, SPI, and I2C.
 * Knowledge of bootloaders and firmware update mechanisms.
 * Debugging experience using J-Link, SWD, and GDB.
 * Experience in low-power firmware design.

Wireless Protocol Expertise (Critical)

 * Hands-on experience in wireless communication technologies such as RF, Sub-GHz, Z-Wave, Zigbee, or other low-power wireless protocols.
 * Experience with mesh networking and wireless sensor networks.
 * Understanding of RF coexistence and wireless communication fundamentals.
 * Experience with OTA firmware updates over wireless.
 * Knowledge of MAC/PHY behavior and custom protocol implementation is an advantage.

Silicon Labs / Z-Wave Experience (Preferred)

 * Experience with Silicon Labs EFR32 microcontrollers.
 * Familiarity with Simplicity Studio and Gecko SDK.
 * Experience with Silicon Labs wireless stack APIs.
 * Knowledge of Z-Wave 700/800 series.
 * Understanding of SmartStart and S2 security.
 * Experience with OTA DFU mechanisms.
 * Familiarity with Zniffer packet analysis and PTI packet tracing.

Security Skills

 * Understanding of secure boot and firmware signing.
 * Experience with key provisioning and encrypted OTA updates.
 * Knowledge of secure pairing and authentication.
 * Understanding of replay protection and secure credential storage.

Additional Preferred Skills

 * Modular firmware architecture and state-machine design.
 * Event-driven embedded systems.
 * Git workflows and CI/CD for firmware.
 * Automated firmware testing.
 * Hardware abstraction layer development.
 * Technical documentation and debugging discipline.

Education:

 * Bachelor Degree

## Description

* We are looking for an experienced Embedded Firmware Engineer with strong expertise in Embedded C, ARM Cortex-M microcontrollers, firmware development, and wireless communication technologies.