Firmware Engineer

OUR MISSION

ButterflyMX is on a mission to empower people to automate property access, operations, and security from a single platform. Our products are installed in more than 20,000+ multifamily, commercial, gated communities, and student-housing properties worldwide, including properties developed, owned, and managed by the most trusted names in real estate. Our features are designed for developers, owners, property managers, and tenants and our products lower operating costs and improve tenant satisfaction.

OUR SOLUTION

Developers and owners no longer need to run building wiring or install in-unit hardware. Property managers can grant building access, revoke permissions, and review entry logs from an online dashboard. Residents can open doors from their smartphones, issue visitor access, and see who is trying to enter the building.

OUR CULTURE & VALUES

Fantastic people are the key to our success. As a distributed, primarily remote workforce, we’re looking for more intelligent, passionate, collaborative, ai-forward, and down-to-earth individuals to join our growing team. We’re driven by a shared commitment to excellence and innovation, grounded in our core values: We delight our customers, We take ownership, We are a community of collaborators, We speak up, We think big and do small, and We are tenacious.

ROLE OVERVIEW

At ButterflyMX, firmware sits at the critical intersection of electronics, embedded systems, product reliability, device security, and customer experience. We are seeking an exceptional Firmware Engineer to help design, build, debug, secure, and optimize the embedded software that powers our next generation of access control, intercom, IoT, wireless, and connected hardware products.

This role requires a rare combination of strong firmware development skill, deep hardware intuition, and practical embedded systems judgment. The successful candidate will be comfortable working close to the hardware — registers, buses, timing, interrupts, memory, power, analog behavior, digital interfaces, and real-world failure modes — while also understanding how embedded devices interact with secure cloud-connected systems.

Our products span multiple embedded environments, including bare-metal microcontroller firmware with main-loop architectures, RTOS-based systems including Zephyr, and embedded Linux platforms. This engineer must be able to write production-quality code independently, analyze and optimize firmware at a low level, troubleshoot hardware/firmware interactions, and use AI tools intelligently to accelerate development without outsourcing engineering judgment.

This is a hands-on, high-impact engineering role for someone with initiative, tenacity, curiosity, and the ability to solve ambiguous problems across hardware, firmware, manufacturing, and field reliability.

RESPONSIBILITIES

- Develop Production-Ready Embedded Firmware

- Design, write, debug, and maintain firmware across bare-metal, RTOS/Zephyr, and embedded Linux platforms.

- Build reliable low-level firmware in C/C++ and other relevant firmware languages for microcontrollers, peripherals, sensors, communication interfaces, power systems, and device control logic.

- Develop main-loop, interrupt-driven, event-driven, and multithreaded architectures optimized for timing, memory, latency, power, boot time, and long-term reliability.

- Own firmware from board bring-up and prototype development through EVT/DVT/PVT, production release, and post-launch support.

- Bridge Hardware, Firmware, and Real-World System Behavior

- Work close to the hardware, including registers, buses, interrupts, ADCs, power rails, signal integrity, timing, noise, grounding, and analog/digital interactions.

- Read schematics, understand PCB layouts, and collaborate with electrical and mechanical engineers on architecture, bring-up, manufacturability, thermal behavior, EMI/EMC, and field installation constraints.

- Diagnose multi-domain failures using oscilloscopes, logic analyzers, debuggers, multimeters, power analyzers, and other lab tools.

- Build firmware that is resilient to power instability, brownouts, signal noise, temperature extremes, communication faults, installation variability, and device aging.

- Build Secure Connected IoT Device Firmware

- Implement secure boot, bootloaders, chain of trust, signed firmware, certificate signing, key provisioning, device identity, and image validation.

- Support secure OTA updates, rollback protection, version control, recovery behavior, and firmware authenticity.

- Develop secure device-to-cloud and device-to-controller communication using appropriate authentication, cryptographic, and transport-layer protections.

- Partner with security, cloud, and systems teams on device hardening, credential management, threat modeling, and secure manufacturing provisioning.

- Implement Embedded Communication Protocols

- Develop and debug firmware for I2C, SPI, UART, GPIO, AD