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Butlr Logo Butlr · IT - Software Development

Firmware/Embedded Engineer

United States 100.00 - 120.00 USD / Hour · Job Posted December 06, 2025
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Job Description

We’re seeking an experienced Firmware/Embedded Engineer to develop, optimize, and maintain embedded Linux–based gateway systems for IoT and edge applications. The role involves end-to-end firmware design, connectivity, security, and integration with cloud services.

Job Responsibility

  • Build and customize Linux OS images (Yocto or Debian-based)
  • Integrate kernel modules, device drivers, and BSPs
  • Optimize boot time, memory, and power usage for embedded devices
  • Implement and manage Ethernet, Wi-Fi, LTE/4G, and PoE networking
  • Configure DHCP, DNS, MQTT, HTTP/HTTPS, NAT, and firewall rules
  • Ensure stable and secure connectivity with automatic recovery (99% uptime target)
  • Develop C/C++/Python services for data acquisition, buffering, and routing
  • Integrate edge ML models and cloud middleware (AWS, MQTT, REST APIs)
  • Manage local storage, caching, and retry logic for intermittent networks
  • Implement secure boot, signed firmware, and integrity checks
  • Manage certificates, keys, and access control
  • Support OTA firmware updates with rollback protection
  • Design system health telemetry (CPU, memory, connectivity, temperature)
  • Create watchdogs, auto-recovery scripts, and remote logging/debugging (jFrog, syslog)
  • Support remote firmware updates and diagnostics
  • Develop and automate unit/integration tests
  • Collaborate with QA on test execution and system validation
  • Bring up and test peripherals (Wi-Fi, LTE, USB, GPIO)
  • Integrate and test Linux drivers (Qualcomm and custom)
  • Validate sensor and RF interfaces
  • Profile CPU, memory, and I/O performance
  • Tune kernel and network parameters for reliability and throughput
  • Optimize flash storage and file system usage
  • Develop clients for MQTT, HTTPS, and WebSockets
  • Handle device provisioning and cloud connectivity (AWS IoT Core, Azure)
  • Support remote configuration and edge analytics modules
  • Work cross-functionally with hardware, QA, and cloud teams
  • Participate in code/architecture reviews
  • Document system architecture and deployment guides

Requirements

  • Strong C/C++/Python skills in embedded Linux environments
  • Hands-on experience with Yocto, BSPs, and networking stacks
  • Familiarity with OTA updates, secure boot, and cloud-IoT integration
  • 5-10+ years related experience
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