Firmware Engineer- Embedded Systems - STM

Position: Firmware Engineer- Embedded Systems - STM32
** 4-6 Month REMOTE

Contract:

*
* ** Electrical & Firmware Engineer - Weather Station Redesign Project*
* We are seeking an experienced Electrical & Firmware Engineer to support the redesign of a modular weather station system. This contract position involves consolidating three legacy weather station products into a unified hardware and firmware platform, featuring ultrasonic measurement and advanced environmental sensors. You will handle both PCB design and low-level firmware development, seeing the electronics through design, prototyping, and iterative test cycles-all in close collaboration with our internal engineering team.

** Project Duration:
** 4-6 months, with potential for extension or future opportunities

*
* Location:

** Remote (occasional travel to Grants Pass, Oregon may be required for testing and project handoff)

*
* Start Date:

** ASAP

** Responsibilities*
* + Design and layout PCBs using Altium Designer (license and shared vault provided)

+ Develop electronics using STM
32 ARM Cortex processors, from schematic to board bring-up

+ Select and integrate humidity/temperature (RH/T) sensors, barometric pressure sensors, and ultrasonic transducers

+ Implement and test connectivity using RS-232, RS-485, SDI-12, and USB interfaces

+ Develop embedded firmware in C using STM
32

Cube/HAL for hardware abstraction

+ Implement and maintain communication protocols and sensor control-including ultrasonic measurement routines

+ Develop serial communications and manage peripheral interfaces via UART, SPI, I2C, analog signals, and A/D and D/A conversion

+ Apply basic digital signal processing (DSP) and PID control as needed for sensor data handling

+ Reference and optimize existing sensor firmware code for system integration and performance

+ Lead iterative prototype and system testing, particularly during wind tunnel qualification

+ Document design, code, and test procedures; participate in knowledge transfer with the internal team

+ Collaborate closely with the customer's hardware and firmware teams to ensure project success

** Qualifications*
* + Hands-on experience with Altium Designer for PCB development

+ Proven ability to design with STM
32 ARM Cortex processors (both hardware and firmware aspects)

+ Strong embedded C programming skills and expertise with STM
32

Cube/HAL

+ Solid knowledge of serial communications (RS-232, RS-485, SDI-12, USB) and sensor integration

+ Familiarity with ultrasonic transducer selection and environmental sensor interfacing

+

Experience with A/D, D/A, DSP, and PID control in embedded systems

+ Capable of working independently and collaboratively across disciplines

+ Willingness and ability to travel periodically to Grants Pass, Oregon for critical test and integration phases (if required)

+ Local candidates preferred, but remote candidates considered

** If you're ready to tackle an end-to-end electronic systems challenge and help deliver the next generation of modular weather station technology, please send your resume and a brief summary of related project experience.*
* As part of our promise to talent, Kelly supports those who work with us through a variety of benefits, perks, and work-related resources. Kelly offers eligible employees voluntary benefit plans including medical, dental, vision, telemedicine, term life, whole life, accident insurance, critical illness, a legal plan, and short-term disability. As a Kelly employee, you will have access to a retirement savings plan, service bonus and holiday pay plans (earn up to eight paid holidays per benefit year), and a transit spending account.

In addition, employees are entitled to earn paid sick leave under the applicable state or local plan.  ()  for more information on benefits and perks that may be available to you as a member of the Kelly Talent Community.

Why Kelly ®  Engineering?

Your engineering skills are in demand, but how do you find the right fit? Easy. At Kelly Engineering, our team creates expert talent solutions to solve the world's most critical challenges. We connect you with leading organizations where you can collaborate on innovative projects, work with cutting-edge technologies and accelerate your growth. Whether you prefer the variety and flexibility of short-term projects or are looking for a long-term opportunity, we're here to guide you to the next step in your engineering career.

About Kelly

Work changes everything. And at Kelly, we're obsessed with where it can take you. To us, it's about more than simply accepting your next job opportunity. It's the fuel that powers every next step of your life. It's the ripple effect that changes and improves everything for your family, your community, and the world. Which is why, here at Kelly, we are dedicated to providing you with limitless opportunities to enrich your life-just ask the 300,000 people we employ each year.

Kelly is committed to providing equal employment opportunities to all qualified employees and applicants regardless of race, color, sex, sexual orientation, gender identity,…