Senior Python Developer Jobs in Enfield, NH (NOW HIRING)

Simbex is seeking a Senior Embedded Systems Engineer to own the full hardware-firmware stack for a next-generation IoT wearable platform. This is a dual-discipline role: you will independently design and develop embedded hardware circuits and PCBs alongside production-grade Zephyr RTOS firmware - fromcomponentselection and schematic capture through board bring-up, sensor integration, and field deployment. The ideal candidate is a hands-on engineer whotakes end-to-end ownershipin building sensor-based hardware and firmware.

Essential Functions:

Electrical Engineering & Hardware Development

• Own hardware design fromcomponentselection and schematic capture through PCB layout review and design-for-manufacture

• Lead board bring-up: power sequencing, peripheral initialization, signal integrity verification, and fault isolation

• Design and characterize low-power analogfront-endsand power management subsystems for battery-operated wearables

• Develop hardware test fixtures and produce electrical characterization reports

Firmware Architecture & Development

• Architect and deliver production Zephyr RTOS firmware on ARM Cortex-M/R targets

• Author device drivers, BSPs, anddevicetreeoverlays; implement sensor acquisition pipelines for IMU-based impact detection

• Design low-power state machines and event-driven architectures for wearable operation

• Set firmware coding standards, CI/CD pipelines, and architecture guidelines for the team

IoT & Wireless Connectivity

• Implement BLE stacks for real-time telemetry and configuration; design OTA update mechanisms viaMCUboot

• Integrate cloud connectivity (MQTT/CoAP) and evaluate edge vs. cloud trade-offs for impact detection

Signal Processing & Algorithm Integration

• Port impact detection algorithms from MATLAB or Python into constrained C/C++ firmware

• Apply sensor fusion (Madgwick, Mahony, complementary filter) foraccuratehead kinematics from multi-axis IMU data

• OptimizeDSP routines for speed and memory footprint on resource-constrained targets

Testing & Quality

• Define and execute unit, HIL, and system integration test plans; build automated regression frameworks

• Maintain design documentation, traceability matrices, and test reports; support compliance activities

Required Qualifications:

• BS or MS in Electrical Engineering, Computer Engineering, Embedded Systems, or related field

• 7+ years of embedded development experience, including 3+ years on production-shipped products

• Hands-on EE skills: independently read schematics, perform board bring-up, and debug hardware/firmware interaction

• Proficiencywith bench instrumentation (oscilloscope, logic analyzer, power analyzer) for power characterization and debug

• Experience selecting microcontrollers, RF SoCs, and sensor ICs (IMU, accelerometer, gyroscope) for product designs

• Strong C/C++ in bare-metal and RTOS-based embedded contexts

• Demonstrated Zephyr RTOS experience:devicetree,Kconfig, module system, and west toolchain

• Experience with ARM Cortex-M SoCs (Nordic nRF52/nRF53, STM32, or similar) and peripherals: SPI, I2C, UART, USB

• BLE firmware experience and familiarity with OTA update workflows (MCUbootpreferred)

Preferred Qualifications:

• Sensor fusion algorithm experience (Madgwick, Mahony) and algorithm porting from MATLAB/Python

• Exposure to sports biomechanics, head impact research, or wearable athletic sensing

• Cloud IoT platform experience (AWS IoT Core, Azure IoT Hub) and embedded security (TLS/DTLS, secure elements)

• Multi-core SoC development (e.g., nRF5340) or experience in a regulated/safety-critical product environment