Firmware Engineer

Quiretech is looking for an accomplished firmware engineer to join our team to work on different projects being executed at different levels. Success will include significant collaboration with EE, Product Management and Product Design Teams. If you enjoy working in a collaborative environment and are looking to support a dynamic team, this might be the role for you! This role will report to our Senior Engineer., Specific duties include, but are not limited to:

• Work with internal and external stakeholders to define requirements, develop architectures, and plan sprints
• Generate firmware from development through to evaluation and validation of programs/systems for new and existing products, ensuring adherence to applicable industry and business standards
• Develop and monitor project timelines, ensuring projects are completed on time and within cost objectives and in accordance with client and company objectives
• Communicate work progress and design details to product development teams
• Conduct and participate in product design reviews to provide technical feedback on product designs and quality
• Conduct firmware unit tests to exercise the code’s implemented functionality and utilize it to debug circuits
• Document your firmware designs in a clear way that allows for collaboration across team members and geographies
• Implement and maintain firmware industry-accepted standards for revision control and firmware maintenance
• Additional duties and overtime as required

Things You Know How To Do:

1. Firmware Architecture & Development * Design, implement, and maintain production-grade firmware for microcontroller-based IoT devices, primarily targeting Nordic Semiconductor nRF52-series SoCs running Zephyr RTOS / Nordic Connect SDK (NCS). * Develop and integrate firmware modules including application state machines (SMF), sensor drivers, peripheral managers (GPIO, ADC, SPI, I2C, UART, USB CDC), and NVM/EEPROM configuration stores. * Implement low-power firmware strategies: tickless idle, system off, wakeup from GPIO/RTC, accurate battery-voltage monitoring via ADC. * Port and adapt firmware across microcontroller families including Atmel/Microchip AVR & SAM, Nordic nRF52/nRF53, Texas Instruments CC-series, and Raspberry Pi RP2040. * Develop firmware for Raspberry Pi (Linux-based) edge nodes, including Python and C daemons, I2C/SPI userspace drivers, and systemd service management.

2. Wireless Protocol Integration * Integrate and debug LoRaWAN stacks (Class A/C) using the LoRa Radio Driver and LoRaWAN stack available in Zephyr RTOS; configure regional parameters (EU868, US915, AU915), ADR, and MAC command handling. * Provision and manage LoRaWAN devices on cloud network servers including AWS IoT Core for LoRaWAN: configure Device Profiles, Service Profiles, and destination rules; send/receive confirmed and unconfirmed downlink frames. * Integrate GPS/GNSS modules (UART NMEA and binary protocols) for location tracking; implement time-of-fix optimization and cold/warm/hot start handling. * Develop and debug BLE firmware using Zephyr’s BLE stack: GAP advertising/scanning, GATT server/client, custom service and characteristic definitions, MCUmgr DFU over BLE (SMP protocol). * Integrate Wi-Fi, RFID/NFC (PN5180 and ISO 15693/14443 protocols), and additional RF peripherals as product requirements dictate.

3. Hardware Bring-Up & Driver Development * Perform hardware bring-up on newly fabricated PCBs: power sequencing validation, clock configuration, peripheral initialization, and first-boot diagnostics. * Review schematic and layout files; collaborate with EE team to identify firmware-visible hardware issues such as pull-up values, signal integrity concerns, and peripheral address conflicts.

4. Cross-Functional Hardware Debug * Work side-by-side with electrical engineers to diagnose and resolve hardware/firmware integration issues, including power consumption anomalies, bus communication failures, and RF performance problems. * Operate and interpret results from standard bench instruments: digital oscilloscopes, logic analyzers (Saleae/Protocol Analyzers), bench power supplies, multimeters, spectrum analyzers, and RF test equipment. * Capture and analyze SPI, I2C, UART, and LoRa/BLE air-interface traffic to validate protocol compliance and identify timing or framing errors. * Use J-Link / nRF9160-DK debug probes and Segger RTT / GDB for real-time firmware debugging and memory inspection.

5. Testing, QA & Production Support * Write unit tests and integration tests using Zephyr’s Twister test framework; automate regression testing in CI/CD pipelines. * Support assembly and rework operations: through-hole and SMD soldering, wire harness fabrication, conformal coating inspection, and rework of BGA/QFN components under microscope. * Document test procedures, pass/fail criteria, and field failure analyses in engineering records systems.

6. Rapid Prototyping & Research * Build functional IoT prototypes rapidly using development boards (nRF52840-DK, Raspberry Pi, Arduino, ESP32) to prove concepts before committing to custom PCB design. * Research and evaluate new MCUs, sensors, wireless modules, and cloud connectivity services; produce written component comparison reports with firmware complexity assessments. * Develop GUI tooling and internal utilities (Python, PyQt, HTML/JS) to assist QA, field technicians, and manufacturing - such as downlink command builders, provisioning dashboards, and device log viewers. * Support cloud-side integration: AWS IoT Core rules, Lambda functions, and MQTT broker configurations related to device fleet management and OTA update delivery.

7. Lab Organization & Documentation * Maintain firmware source repositories with clear branching strategy, commit hygiene, and version tagging aligned to hardware revisions. * Write and maintain firmware architecture documents, peripheral interface specifications, bring-up guides, and production programming SOPs. * Organize and maintain the electronics lab workspace: component inventory, test fixture storage, ESD precautions, and calibration schedules for bench instruments. * Source and evaluate electronic components and modules; conduct market searches for alternatives when parts are end-of-life or unavailable.

Do you have experience in Technical writing?, Do you have a Bachelor of Science?, * Minimum of 3-5 years of experience working in embedded systems firmware space, with significant periods focused on the development of consumer electronics, real-time control systems, and motor control systems

• Bachelor of Science (B.S.) or Master of Science (M.S.) degree in Electrical Engineering, Computer Engineering, Embedded Systems, or similar
• You are a creative person that delivers innovative solutions from concept to production
• Highly motivated and self-starting with strong attention to detail and impeccable organizational skills
• Demonstrated portfolio of shipped or prototype IoT/embedded products (GitHub repos, senior design projects, or professional references)
• Good working knowledge of electronics testing tools, components, and lab safety practices
• Experience with schematic capture and PCB layout review (Altium, KiCad, Eagle, or similar)
• Strong written and verbal communication skills; ability to document technical work clearly, Ability to work remote some of the time. This is a paid full-time position in Cresskill, NJ (Location is accessible within walking distance of public transportation). Candidates are expected to work for at least 40 hours per week., * Embedded software: 3 years (Preferred)

• Competitive Salary
• Work-life flexibility

Quiretech is a growing electrical systems and device engineering company that provides customized solutions to the medical and consumer electronics industry. It specializes in embedded system circuit design, fabrication and assembly, along with firmware development and testing. We work with a variety of clients either as direct engineering consultants or as part of a larger team of consultants, therefore our exposure to new and exciting projects and technologies is vast.