Firmware Engineer- Embedded Systems - STM32

4–6 Month REMOTE ContractElectrical & Firmware Engineer — Weather Station Redesign ProjectWe 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 opportunitiesLocation: Remote (occasional travel to Grants Pass, Oregon may be required for testing and project handoff)Start Date: ASAPResponsibilitiesDesign and layout PCBs using Altium Designer (license and shared vault provided)Develop electronics using STM32 ARM Cortex processors, from schematic to board bring-upSelect and integrate humidity/temperature (RH/T) sensors, barometric pressure sensors, and ultrasonic transducersImplement and test connectivity using RS-232, RS-485, SDI-12, and USB interfacesDevelop embedded firmware in C using STM32Cube/HAL for hardware abstractionImplement and maintain communication protocols and sensor control—including ultrasonic measurement routinesDevelop serial communications and manage peripheral interfaces via UART, SPI, I2C, analog signals, and A/D and D/A conversionApply basic digital signal processing (DSP) and PID control as needed for sensor data handlingReference and optimize existing sensor firmware code for system integration and performanceLead iterative prototype and system testing, particularly during wind tunnel qualificationDocument design, code, and test procedures; participate in knowledge transfer with the internal teamCollaborate closely with the customer’s hardware and firmware teams to ensure project successQualificationsHands-on experience with Altium Designer for PCB developmentProven ability to design with STM32 ARM Cortex processors (both hardware and firmware aspects)Strong embedded C programming skills and expertise with STM32Cube/HALSolid knowledge of serial communications (RS-232, RS-485, SDI-12, USB) and sensor integrationFamiliarity with ultrasonic transducer selection and environmental sensor interfacingExperience with A/D, D/A, DSP, and PID control in embedded systemsCapable of working independently and collaboratively across disciplinesWillingness and ability to travel periodically to Grants Pass, Oregon for critical test and integration phases (if required)Local candidates preferred, but remote candidates consideredIf 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. 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