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Embedded Firmware Engineer

Alcor -
Ciudad de México, CDMX

Postulación rápida

Información del empleo

Hace 18 horas

Cualificaciones

Jira
Procesamiento de señales digitales
Cifrado
Firmware

Descripción completa del empleo

Embedded Firmware Engineer

Location

Mexico (Remote)

About the project

We're building the next generation of a consumer health wearable for older adults. The device runs continuous biometrics, on-device interaction, and safety features, and syncs to a companion phone app over Bluetooth Low Energy. It's an in-flight firmware codebase on a Nordic nRF-family SoC built with Zephyr / the nRF Connect SDK; not a greenfield project. You'll own a defined slice of it and take it to production quality.

The device connects over BLE (no cellular). Work is remote and async-first, driven from a Jira backlog and internal design docs.

What you will do

You'll own multiple workstreams end-to-end. Depending on fit and availability, that's a piece such as:

BLE connectivity and data sync: GATT services, connection lifecycle, pairing/bonding, and reliable delivery of event and bulk data to the phone.
A sensor or peripheral subsystem: driver bring-up and a clean capture/processing pipeline on constrained hardware.
Device interaction and state machines: buttons, haptics, indicators, and the flows that tie them together.
Power management: sleep/wake scheduling, duty-cycling, and hitting a multi-day battery target.
OTA and device robustness: dual-bank updates with rollback, safe against power loss.
Data integrity and secure storage: buffering, sync, and encryption of sensitive health data at rest.

Every deliverable ships with tests and on-target validation evidence appropriate to a health device.

Must-haves

Nordic nRF-family firmware experience, shipped to production.
Zephyr RTOS / nRF Connect SDK hands-on: device tree, Kconfig, and the west build system.
BLE from the stack up: GATT design, connection lifecycle, pairing/bonding, throughput, and fragmentation.
OTA with rollback: dual-bank updates that are safe at any point in the sequence.
Power-constrained firmware: you've hit a real battery-life target on a shipping product.
Sensor/peripheral bring-up straight from a datasheet (SPI/I2C/I2S), including interrupt- and DMA-driven data paths.
Strong C, comfortable in disassembly to chase interrupt, DMA, and timing bugs.
A health-data quality bar: you treat correctness and safety-critical paths as non-negotiable, and you're comfortable working with PHI/HIPAA-sensitive data responsibly.

Nice-to-haves

Optical biosensor / PPG signal processing (HR, HRV, SpO2) and motion rejection.
IMU integration and on-device activity/motion classification.
Multi-core SoC firmware and inter-core communication.
Experience migrating or versioning a device-to-app data contract.

How you work

This is a low-direction, async-first engagement. We are hiring for the ability to turn that into finished, production-quality firmware with minimal supervision. Concretely, you:

Turn vague asks into scoped work: You write down what's in, what's out, acceptance criteria, and how you'll validate, before writing code.
Ask the decision-relevant questions up front, then move: You surface the two or three questions that actually change the design, rather than either stalling for a full spec or silently guessing on risky calls.
Make and document reasonable assumptions when an answer isn't available; pick a defensible default, note it, flag it, keep moving.
Propose decisions with trade-offs, not just questions.
Surface risk and blockers early, not at the deadline.
Communicate in writing: Design notes, clear PR descriptions with validation evidence, and a short decision log are the default.

Expect to walk through a time you shipped something from a request; what you assumed, what you asked, and how you protected the deadline when reality diverged from the plan.

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