We're hiring a Senior Embedded Software Engineer to design, build, and ship production-grade firmware for connected devices using Zephyr RTOS on ARM Cortex-M. You'll own features end-to-end--from requirements and architecture through implementation, test automation, and performance optimization--with a strong emphasis on reliability, security, and low-power operation.

Responsibilities

• Deliver embedded software across the full lifecycle: requirements -> design -> implementation -> verification

• Implement features across multiple subsystems (drivers, connectivity, power, security); debug complex issues across firmware, hardware, and toolchains

• Work with devicetree/Kconfig, Zephyr drivers, and subsystem APIs (e.g., Bluetooth, UltraWideBand, NFC, logging, shell, PM)

• Build and maintain automated tests (ztest, Twister) and CI/CD pipelines for firmware validation on real hardware

• Perform hardware bring-up (boot, clocks, peripherals, memory maps) using J-Link/GDB/RTT/SWO

• Collaborate closely with hardware, QA, and product to land features on schedule with high quality

• Contribute to secure boot/FOTA workflows and production-ready release practices

Candidate profile - must have

• Bachelor's degree in Automatics, Computer Science, Telecommunications, Electronics, or related field.

• 5+ years building firmware for ARM Cortex-M devices, including at least 3+ years hands-on with Zephyr RTOS.

• Strong C (and solid C++ familiarity), embedded design, and device-driver development (I2C/SPI/UART, GPIO/EXTI, ADC/DMA, timers).

• Zephyr essentials: devicetree, Kconfig, CMake/west, Zephyr SDK/toolchains, boards/overlays, and subsystem integration.

• Connectivity experience with BLE (GAP/GATT) and at least one of UWB or NFC; proficiency with protocol sniffers and analyzers.

• Proficient in debugging and bring-up using J-Link, logic analyzers, and oscilloscopes.

• Experience with CI/CD and automated test (ztest/Twister, HIL where applicable).

• Excellent written and spoken English.

Candidate profile - nice to have

• Secure boot & updates (MCUboot, DFU/FOTA), secure storage/crypto, key handling

• Low-power design (sleep states, timers, PM policies) and profiling methodologies

• Knowledge of MISRA-C, static analysis, and code review practices

• Experience with Nordic nRF or similar SoCs (Bluetooth Controller/Host stack integration)

• Python for tooling/test harnesses; basic scripting for build/test automation

• Familiarity with Agile workflows and backlog ownership

Tools & Ecosystem

• Build: west, CMake, Zephyr SDK, Ninja, cache strategies

• Test: ztest, Twister, HIL; unit/integration testing

• Debug/Trace: J-Link, GDB, RTT/SWO, logic analyzer, oscilloscope

• CI/CD: GitHub Actions / GitLab CI / Jenkins; artifact versioning and release tagging

• Collaboration: Code reviews, design docs, and clear communication across teams

What We Offer

• Flexible and hybrid working arrangements

• Opportunity to work on innovative products and technologies used by leading international customers

• Access to modern development tools, laboratories and testing environments

• Technical and professional development through training, certifications and knowledge-sharing initiatives

• International collaboration with engineering teams across the Marquardt Group

• Attractive compensation package including 13th salary, meal vouchers and annual bonuses

• Comprehensive benefits package covering medical services, sports & wellness, culture, education, tourism and more

• Long-term career development within a global technology company

About Marquardt R&D Center Sibiu

The Marquardt R&D Center in Sibiu has been developing innovative technologies and products since 2008.

Our engineering teams work on software development, hardware design, mechanical engineering, testing and validation, contributing to products used by some of the world's leading automotive manufacturers.

By combining innovation, technical excellence and teamwork, we help shape the technologies of tomorrow.

About Marquardt Romania

Marquardt is a globally operating family-owned technology company with more than 8,000 employees worldwide. In Romania, our Production facilities, R&D Center and Business Services organization work together to develop, manufacture and support innovative solutions for leading international customers.

Driven by innovation, teamwork and continuous improvement, we create technologies that shape the future of mobility and beyond.

We invite you to be part of the successful Marquardt team!

Contact Marquardt R&D Center

Address: Str. Emil Cioran, Nr. 2, Sibiu (behind the Ramada hotel)

Web: www.marquardt.com/careers/locations/romania