[Remote] Hardware Engineer: Prototyping & Integration (Contract)

Note: The job is a remote job and is open to candidates in USA. MUUD Health is a fully remote mental health organization focused on delivering integrated care and digital health innovation. They are seeking a Hardware Engineer: Prototyping & Integration to manage the development of the MUUD Ring, a smart ring designed for mental fitness tracking, involving responsibilities in design, prototyping, and software integration.

Responsibilities

• Design, iterate, and refine the physical architecture and structural enclosure of the MUUD Ring
• Maximize internal layout efficiency to accommodate micro-components (sensors, battery, antenna) while maintaining a comfortable, ergonomic wearable form factor
• Prepare, optimize, and manage design files for rapid-prototyping fabrication methods like high-resolution 3D printing or micro-machining
• Physically assemble low-volume prototype variants of the smart ring, managing component alignment and micro-soldering tasks
• Maintain a bench-top testing environment to troubleshoot physical hardware defects, perform power-consumption audits, and manage battery optimization
• Source, evaluate, and test modular physical components (biometric sensors, micro-controllers) to find the optimal performance-to-size ratio
• Write and debug script-level firmware to bridge physical sensors with internal microcontrollers
• Establish secure peripheral communication channels using standard protocols to manage real-time biometric data streams
• Coordinate to ensure physical hardware signals transfer seamlessly via local APIs or Bluetooth/Wi-Fi communication stacks to the MUUD mobile app
• Conduct rigorous device bring-up testing, documenting data accuracy, sensor responsiveness, and system bottlenecks
• Work collaboratively to ensure the hardware's data output aligns with the clinical metrics required for MUUD's mental fitness archetypes

Skills

• Proven background in electrical engineering, mechanical engineering, mechatronics, or a hands-on product development equivalent
• Strong proficiency with 3D modeling and CAD workflows using SolidWorks, Autodesk Fusion 360, or similar suites
• High comfort level with physical workbench fabrication, including precision micro-soldering, circuit troubleshooting, and multimeter use
• Practical experience programming embedded systems and microcontrollers using C/C++ or Python
• Clear understanding of core hardware communication protocols (I2C, SPI, UART)
• Ability to work independently and manage complex R&D milestones within a fast-paced, remote startup environment
• Direct experience developing wearable consumer tech, biometric sensors, or IoT connected devices
• Familiarity with micro-battery optimization or ultra-low-power asset management
• Experience collaborating on cross-functional initiatives alongside mobile software developers, product managers, or clinical healthcare professionals
• Possession of or easy access to a baseline hardware prototyping/workbench setup

Benefits

• Competitive contract-based compensation commensurate with technical experience
• The opportunity to directly build, shape, and iterate on a foundational wearable health device from its early stages
• A meaningful contribution to an innovative, mission-driven ecosystem transforming how the world approaches proactive mental wellness

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