Senior Firmware Engineer

Job Title: Senior Firmware Engineer Cellular & Wi-Fi IoT

Experience: 4 – 8 Years Domain: LTE / NB-IoT / Wi-Fi | Low-Power IoT Location: Ahmedabad

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Role Summary

We are looking for a Senior Firmware Engineer with strong hands-on experience in cellular and Wi-Fi based IoT products. The role focuses on firmware development, connectivity integration, and aggressive battery optimization for production-grade devices.

You will work on real field-deployed products, owning firmware modules such as cellular modem integration, Wi-Fi connectivity, power management, OTA, and system debugging.

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Key Responsibilities

Firmware Development & Architecture

• Design and develop embedded firmware on RTOS / bare-metal platforms.
• Implement modular firmware components aligned with system architecture.
• Participate in firmware architecture and design reviews.

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Cellular Firmware (Core Skill)

• Integrate and maintain firmware for:
• LTE / LTE-M / NB-IoT
• Work with cellular modules (Quectel / u-blox or similar):
• AT command handling
• Network attach / detach logic
• Reconnect and recovery flows
• Handle real-world network issues:
• Poor coverage
• Intermittent connectivity
• SIM and registration failures
• Optimize modem usage for:
• PSM / eDRX
• Minimal wake-up and transmit time

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Wi-Fi Firmware

• Implement Wi-Fi connectivity:
• Station mode
• TCP/IP stack integration
• Secure communication (TLS)
• Optimize Wi-Fi behavior for:
• Power consumption
• Fast connection
• Reliable data transfer
• Handle coexistence scenarios between Wi-Fi and Cellular.

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Battery Optimization & Low-Power Design

• Implement low-power firmware strategies:
• MCU sleep modes
• Peripheral power gating
• Modem power control
• Measure and optimize:
• Sleep current
• Active and peak current
• Contribute to achieving multi-month or multi-year battery life.
• Collaborate with hardware teams on power-related issues.

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Device-to-Cloud & OTA

• Implement device-to-cloud communication using:
• MQTT / HTTPS
• Support OTA firmware updates and rollback mechanisms.
• Implement logging and diagnostics for field monitoring.

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Debugging & Validation

• Debug firmware issues using:
• JTAG / SWD
• Logic analyzers
• Oscilloscopes
• Investigate and resolve field-reported issues.
• Support board bring-up and system validation.

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Required Technical Skills

Embedded & RTOS

• Strong proficiency in Embedded C / C++.
• Hands-on experience with RTOS (FreeRTOS / Zephyr / ThreadX).
• Good understanding of:
• Interrupts
• Task scheduling
• Memory management
• Low-power modes

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Cellular & Wi-Fi

• Hands-on experience with:
• LTE / LTE-M / NB-IoT
• Wi-Fi firmware stacks
• Experience integrating TCP/IP and secure protocols (TLS).
• Familiarity with cellular power-saving features (PSM, eDRX).

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Power Optimization

• Experience in current measurement and profiling.
• Understanding of battery behavior and brown-out handling.
• Ability to correlate firmware states with power consumption.

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Tools & Debugging

• Experience with:
• JTAG / SWD debuggers
• Oscilloscope
• Logic analyzer
• Comfortable debugging hardware–firmware interaction issues.

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Good to Have

• Experience with BLE in addition to cellular/Wi-Fi.
• Exposure to OTA frameworks and secure boot.
• Experience with mass production firmware and factory testing.
• Familiarity with Quectel modules (BG95 / BG77 / BG770 etc.).

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Ideal Candidate Profile

• Strong hands-on firmware engineer (not just theory).
• Comfortable working with unstable networks and power constraints.
• Ownership mindset — able to take a feature from design to field deployment.
• Interested in growing toward Firmware Architect / Tech Lead roles.