Senior Embedded Linux Engineer (Embedded Linux)

Location: Fully remote across Europe; optional pet-friendly office in Warsaw. Core team hours are 10:00–18:00 CET, with occasional scheduled calls with US-based clients up to approximately 20:00.

Salary: 120–180 PLN net/hour on a B2B contract, depending on experience.

Company

hirify.global designs and co-creates connected physical and digital products, including wearables, smart audio, health-tech hardware, and IoT devices, for clients such as Oura, Bose, Neurable, and McIntosh.

What you will do

• Design and maintain custom embedded Linux distributions using Yocto or Buildroot.
• Bring up new hardware platforms and debug issues from schematics through software alongside hardware engineers.
• Develop BSPs and bootloaders, customize the Linux kernel, and write or debug drivers for interfaces such as I2C, SPI, UART, and MIPI.
• Write efficient C/C++ system services and applications and optimize boot time, memory usage, and power consumption.
• Implement security features including Secure Boot and encrypted filesystems, and debug firmware and hardware-adjacent issues using JTAG/SWD, serial logs, logic analyzers, oscilloscopes, and vendor tools.
• Collaborate with hardware, mobile, QA, backend, product, and client-side teams on requirements, architecture, testing, delivery, documentation, and engineering practices.

Requirements

• 4+ years of professional experience in embedded or firmware development.
• Strong hands-on C/C++ experience for embedded systems.
• Hands-on experience with Yocto Project or Buildroot, plus understanding of the Linux kernel, device drivers, and device tree.
• Experience with embedded CI/CD, bootloaders—particularly U-Boot—and constraints involving timing, memory, peripherals, boot time, and power consumption.
• Ability to debug firmware and hardware-adjacent issues with JTAG/SWD, serial logs, logic analyzers, oscilloscopes, and vendor tooling.
• Ability to read schematics, datasheets, technical documentation, and errata; familiarity with UART, SPI, I2C, GPIO, or similar interfaces.
• Proficiency with Bash and/or Python for automation and testing, plus solid Git and GitHub collaboration skills.
• Written and spoken English at minimum B2, clear communication with engineers, PMs, QA, and clients, and a self-reliant, responsible problem-solving approach.

Nice to have

• Experience with ARM Cortex-M microcontrollers and RTOS such as FreeRTOS or Zephyr.
• Advanced Bluetooth/BLE experience, including GATT, pairing and bonding, connection parameters, throughput, power trade-offs, and secure OTA/DFU.
• Networking experience with TCP/IP, Wi-Fi, Ethernet, and MQTT.
• Multimedia and audio experience with GStreamer, V4L2, ALSA, I2S, codecs, or graphics acceleration.
• Security experience with Secure Boot, OP-TEE, TrustZone, encrypted filesystems, or cryptography.
• Sensor integration and power profiling, containerization on embedded devices, experience with different platforms, and a personal GitHub or GitLab project portfolio.

Culture & Benefits

• Freelance time-and-material engagement for an initial three-month mutual evaluation period, with a possibility of moving to a permanent contract and full benefits.
• Flexible working hours, remote work across Europe, or work from the Warsaw office.
• Up to 26 days of paid holidays and 10 days of sick leave on B2B; paid leave and medical benefits are not included during the freelance period.
• Self-development budget of 2,000 PLN/year, private medical care, working equipment, knowledge-sharing activities, and an assigned onboarding buddy.
• Structured ramp-up with progressively larger tasks, early feedback, and participation in both the Firmware & Hardware chapter and a project squad.

Hiring process

• HR call of up to 45 minutes.
• Technical interview of up to 90 minutes.
• Final feedback; the recruitment process usually takes 1–2 weeks.