Embedded Firmware and Hardware Engineer - Wearable Devices

open ring • Estonia

Remote

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AI Summary

Shape the firmware and hardware of the world’s first open-source smart ring platform. Lead bring-up, validation, and production readiness for wearable tech. Collaborate with cross-functional teams to deliver scalable, reliable products.

Key Highlights

Core role in firmware and hardware development for wearable devices

Hands-on experience with BLE 5.x, low-power design, and sensor integration

Startup environment with direct collaboration with founders and cross-functional teams

Key Responsibilities

Develop, maintain, and debug low-power firmware for wearable hardware using BLE 5.x, RTOS, or bare metal

Lead hardware bring-up on new prototypes, validate schematics, review layouts, and define board revisions

Define, test, and validate 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 with CM for DFM reviews, EVT/DVT/PVT validation, and yield optimization

Work with 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

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Technical Skills Required

C/C++ Embedded Firmware Development Hardware Bring-up and Validation

Benefits & Perks

Equity-based compensation

Fully remote work

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Nice to Have

Experience with RTOS (Zephyr)

Hands-on experience with oscilloscopes, logic analyzers, and hardware validation tools

Job Description

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

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