Embedded Firmware Engineer

About Us

At pūrtec, we are building the future of Environmental Quality Intelligence (EQi™) — bringing real-time environmental insights to the spaces where people live, work, and thrive. From luxury hospitality to health-critical facilities, our IoT-powered platform is creating a new category in building wellness and human experience intelligence.

We’re entering an exciting stage of growth, preparing to scale our consumer-facing products and enterprise offerings across hospitality, healthcare, and real estate verticals. To do this, we need a proven Embedded Firmware Engineer who can turn complex requirements into an embedded IoT technology.

Role Overview

The Embedded Firmware Engineer will design and develop firmware and low-level control software for environmental monitoring or control devices, such as air quality sensors, weather stations, or energy-efficient IoT products. This engineer will work as a self-reliant individual contributor at the intersection of electronics and software, developing high-reliability embedded systems capable of continuous autonomous operation in variable environmental conditions.

What You’ll Do

• Design, implement, and maintain firmware for microcontroller-based environmental monitoring systems using C.
• Integrate and manage sensors for temperature, humidity, particulate matter, pressure, or CO₂ and ensure accurate calibration and signal processing.
• Develop efficient real-time control and communication routines under an RTOS (e.g., FreeRTOS, CMSIS-RTOS2, or Zephyr).
• Implement low-power modes, sleep scheduling, and data acquisition strategies for battery devices.
• Interface with hardware peripherals via communication protocols such as I²C, SPI, UART, and Modbus.
• Design and maintain bootloaders, OTA (Over-The-Air) update mechanisms, and fault recovery logic.
• Collaborate with hardware engineers on PCB bring-up, debugging, and validation using lab instruments (oscilloscopes, logic analyzers).
• Develop unit tests, system integration tests, and environmental reliability validation processes.
• Contribute to robust documentation for firmware design, hardware-software interface specifications, and test procedures.
• Work closely with firmware team to ensure accurate telemetry data transmission and synchronization over BLE and Wi-Fi.

What We’re Looking For

• Bachelor’s degree in computer science, computer engineering, embedded systems, or equivalent discipline.
• At least 3 years of experience in embedded firmware development with ARM Cortex-M architectures or similar microcontrollers.
• Solid proficiency in C, with good understanding of memory management and interrupt-driven programming.
• Experience with RTOS development (FreeRTOS, CMSIS-RTX5, or ThreadX) including task scheduling, synchronization, and ISR integration.
• Familiarity with sensor integration, analog/digital interface design, and signal conditioning principles.
• Familiarity with STM32CubeIDE configuration and code generation.
• Experience using version control (Git) and continuous integration tools.
• Strong debugging skills using oscilloscopes, logic analyzers, and JTAG/SWD interfaces.
• Excellent analytical and problem-solving skills with attention to detail.
• Strong communication and documentation skills suitable for cross-functional coordination.

Ways You Can Stand Out

• Experience developing IoT or environmental sensing devices with cloud connectivity (MQTT, HTTPs, AWS IoT, or Azure IoT Hub).
• Familiarity with wireless protocols such as BLE or cellular IoT.

Why Join Us?

• Be part of a mission-driven company redefining environmental wellness and indoor intelligence.
• Shape the launch of cutting-edge IoT products and a category-defining SaaS platform.
• Work alongside visionary leadership with experience scaling consumer and enterprise brands.

Job Types: Full-time, Part-time, Contract

Pay: $60.00 - $90.00 per hour

Benefits:

• Flexible schedule

Work Location: Hybrid remote in Lake Forest, CA 92630