Embedded Firmware and Hardware Engineer - Wearable Devices

Company Description

At Open Ring (www.o-ring.tech), we’re behind the world’s first open-source smart ring platform, built for researchers, startups, and developers. We’re building a community-driven ecosystem for wearable tech innovation. As we scale, we’re eager to welcome exceptional talent ready to contribute to a global movement.

Role Overview

You’ll be one of the core engineers shaping both firmware and hardware, working across bring-up, validation, and production readiness. Expect to collaborate daily with our full-stack engineer and founders to turn early prototypes into a scalable, reliable product.

Key Responsibilities

• Develop, maintain, and debug low-power firmware for wearable hardware (BLE 5.x, RTOS or bare metal).
• Lead hardware bring-up on new prototypes validate schematics, review layouts, and help define board revisions.
• Define, test, and validate existing electrical designs; propose improvements for signal integrity, power, and manufacturability.
• Own sensor integration and hardware–firmware interface design (I²C, SPI, UART, GPIO).
• Build and refine factory test firmware and diagnostic tools for CM-level testing and calibration.
• Collaborate closely with the CM for DFM reviews, EVT/DVT/PVT validation, and yield optimization.

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• Work hand-in-hand with the mobile developer to verify BLE connectivity, data logging, and end-to-end user experience.
• Contribute to hardware validation test plans, reliability testing, and bring-up documentation.

Qualifications

• 5+ years in embedded firmware and hardware integration (wearables, IoT, or consumer electronics).
• Proficient in C/C++, RTOS (Zephyr) environments, and common MCU architectures.
• Solid understanding of schematics, PCB layout constraints, and debugging hardware issues.
• Experience with BLE 5.x, low-power design, and sensor interfaces.
• Hands-on experience with prototypes, oscilloscopes, logic analyzers, and hardware validation tools.
• Comfortable working directly with manufacturers and suppliers on technical issue resolution.
• Startup-ready mindset, proactive, fast, resourceful, and hands-on.

Why Join

• You’ll work directly with the founding team, no silos, no layers.
• Own both firmware and hardware outcomes, from prototype to production.
• Collaborate closely with the mobile and mechanical teams in a fast-moving, experimental environment.
• Build the core technology for an open, developer-ready wearable platform.

Are you ready to contribute to the next generation of smart wearables - apply now!

We would love to hear from you!

Please note this position is equity based and not suitable in case you're looking for a relocation, position is remote.