Firmware Engineer

King Technology, Inc.; Minnetonka (MN); On-site; USD 90,000 - 120,000; Full time

Job summary

King Technology, Inc. in Minnetonka, MN, seeks a Firmware Engineer to bridge hardware and cloud ecosystems. Design low-latency C/C++ firmware for microcontrollers, implement sensor drivers, and enable IoT connectivity across Wi‑Fi, BLE, and more.

Collaborate on cloud integrations (AWS/Azure/Google Cloud), data pipelines, and app interfaces with hands-on hardware debugging and RTOS or bare‑metal work. BS/MS in EE/CS and 2–5 years embedded experience required.

Qualifications

• Degree in EE/CS or related field
• 2–5 years of embedded systems experience
• Strong firmware development fundamentals in C/C++
• Hands-on hardware debugging and RTOS familiarity

Responsibilities

• Design, code, and debug C/C++ firmware for microcontrollers.
• Interface sensors via I2C/SPI/UART and develop drivers.
• Implement IoT connectivity with Wi‑Fi, BLE, LoRa, or cellular and MQTT/CoAP protocols.
• Collaborate on cloud data integration (AWS IoT Core, Azure IoT, Google Cloud).
• Assist in developing mobile/web interfaces that interact with hardware.
• Support data mining/analytics by scripting (Python/SQL).
• Other duties as assigned

Skills

C/C++ firmware development

ARM Cortex-M/ESP32

RTOS/bare-metal

Sensor integration (I2C/SPI/UART)

TCP/IP, IoT security

Python for data analysis

Education

BS/MS in Electrical Engineering or Computer Science

Tools

Oscilloscopes

Logic Analyzers

JTAG/SWD

Git

Job description

King Technology is a Minnesota-based innovator that designs and manufactures smart water care solutions for pools and hot tubs. Known for its patented technologies and purpose-driven culture, King Technology is committed to making water care easier while “Enriching Lives Daily” for customers, employees, and communities.

King Technology is seeking a Firmware Engineer who will be the bridge between our physical hardware and our digital ecosystem. You will develop low-latency code for sensors and IoT devices, ensure seamless communication with cloud platforms, and contribute to the mobile app and backend data layers that bring our products to life.

Essential Functions:

• Firmware Development: Design, code, and debug C/C++ firmware for microcontrollers (ARM Cortex-M, ESP32, or similar).
• Sensor Integration: Interface with various sensors (IMUs, optical, environmental) via I2C, SPI, and UART, including driver development and signal processing.
• IoT Connectivity: Implement and optimize wireless protocols (Wi‑Fi, BLE, LoRa, or Cellular) and messaging protocols like MQTT or CoAP.
• Cloud & Integration: Collaborate on the integration of device data into cloud environments (AWS IoT Core, Azure IoT, or Google Cloud).
• App & Interface Development: Assist in developing or maintaining mobile/web applications (React Native, Flutter, or similar) that interact with our hardware.
• Data Mining & Analytics: Support back‑office operations by writing scripts (Python/SQL) to extract, clean, and analyze telemetry data for performance optimization and business intelligence.
• Other duties as assigned
• Proficiency in C/C++ and familiarity with RTOS (FreeRTOS, Zephyr) or bare‑metal development.
• Hands‑on experience with hardware debugging tools (Oscilloscopes, Logic Analyzers, JTAG/SWD).
• Solid understanding of TCP/IP and IoT security best practices.
• The "Plus" Skills (Highly Desired):
• Experience with Python for data automation and "back‑office" data mining.
• Knowledge of RESTful APIs and JSON data structures.

Job Qualifications:

• Degree: BS/MS in Electrical Engineering, Computer Science, or a related field.
• Experience: 2–5 years of professional experience in embedded systems.
• Embrace and foster company values of Integrity, Excellence, People Chemistry, Golden Rule, Courage and Servant‑Leadership.
• Full‑Stack Mindset: You enjoy understanding how a bit of data travels from a sensor pin all the way to a cloud database.
• Problem Solver: You thrive in the "gray area" between hardware and software.
• Self-Starter: Comfortable working in a fast‑paced environment with evolving requirements
• Ability to work in the Minnetonka, Minnesota office no less than three days per week

What’s it like at King Technology?

Our culture is a result of our Mission, Vision, and Values. They are a way of life. Our employees live these out every day in small acts of kindness and overarching attitudes at every level of the company. You’ll see people with Integrity. People with Courage. People who mirror our business values of Excellence, Servant‑Leadership and Innovation, and enrich everyone’s lives by adding their own uniqueness to our company’s culture.

Join us at King Technology and help shape a culture where people, purpose, and innovation thrive together.