Senior Firmware Engineer

Wavelynx

. Architect, implement, and maintain bare-metal and RTOS-based firmware for smart card readers and controllers .

Posted 9/28/2026full-timeBroomfield • Colorado • United StatesSenior💰 $120,000 - $150,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in embedded software development, particularly with C and C++, and a strong background in real-time operating systems. Proficient in optimizing RFID/NFC protocols and implementing secure communication for smart card readers and controllers.

Highest-signal resume keywords

Embedded Software DevelopmentReal-Time Operating SystemsARM Cortex-M MicrocontrollersNFC ChipsetsSecure Communication Protocols

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C ProgrammingC++ ProgrammingFreeRTOSZephyrRFID/NFC OptimizationOTA/FOTA Firmware UpdatesStatic Code AnalysisProtocol ComplianceAESECC

Tools & Technologies

Logic AnalyzersOscilloscopesRF Test EquipmentCI/CD PipelinesSecure ElementsSecure Application Modules

Industry Keywords

Physical Access Control SystemISO 14443FelicaISO 15693OSDPUL 294FCCCEISO/IEC StandardsTLS/DTLS

Tech Stack

Tools & technologies

CloudRTOSTCP/IPC++

About the role

Key responsibilities & impact

Architect, implement, and maintain bare-metal and RTOS-based firmware for smart card readers and controllers
Optimize 13.56 MHz RFID/NFC field processing and related card protocols
Integrate and secure Apple Wallet and Google Wallet mobile credentials using Secure Elements and Secure Application Modules
Implement secure communication protocols between readers, controllers, and cloud environments
Develop tamper-resistant OTA/FOTA firmware update mechanisms with zero downtime
Troubleshoot networking issues across serial buses, IP networks, and RF interfaces
Collaborate with hardware engineers on schematic review, board bring-up, signal integrity testing, and power management optimization
Drive automated firmware testing, unit testing, and CI/CD pipelines for hardware-in-the-loop environments
Lead root-cause analysis for field escalation issues involving RF performance, timing dependencies, or protocol compliance
Work closely with hardware, software, and systems engineering teams
No supervisory responsibilities

Requirements

What you’ll need

5+ years of professional embedded software development experience using C and C++
Strong background with real-time operating systems (FreeRTOS, Zephyr, or similar)
Experience with ARM Cortex-M microcontrollers
Experience with logic analyzers and oscilloscopes
Willingness to travel domestically and internationally from 0 to 10 days per year
Direct background in the Physical Access Control System (PACS) industry
Hands-on experience with NFC chipsets, ISO 14443 Type A/B, Felica, or ISO 15693 standards
Expertise with OSDP, RS-485, TCP/IP, UDP, TLS/DTLS, MQTT, or BLE stack development
Knowledge of AES, ECC, RSA, PKI, secure boot, and hardware root-of-trust implementations
Experience with static code analysis and RF test equipment
Exposure to UL 294, FCC, CE, and ISO/IEC standards

Benefits

Comp & perks

Company-sponsored medical insurance
Company-sponsored dental insurance
Company-sponsored vision insurance
HSA-eligible plans available
Retirement plan with up to 6% 401(k) match
Holidays
Vacation leave
Sick leave