Embedded Software Engineer – HVAC Controls

Your role

As part of the R&D team, you’ll collaborate with colleagues in hardware, cloud software, and UX to build reliable, maintainable products that meet strict quality and performance requirements.

• Developing embedded software in C/C++ for microcontroller-based and Linux-based systems
• Integrating software with custom hardware
• Maintaining code quality through testing, refactoring, and code reviews
• Contributing to system design and software architecture
• Implementing user interfaces in React for selected web-based applications
• Supporting the Yocto build pipeline for embedded Linux

Must-have qualifications

• Bachelor’s degree or higher in embedded software, electronics engineering, or similar
• At least three years of experience in embedded software development
• Proficiency in C/C++ for embedded systems
• Experience with embedded toolchains (GCC, ARM toolchain, or similar)
• Experience with real-time programming and microcontrollers
• Familiarity with embedded debugging tools
• Understanding of hardware/software interfaces and schematics
• Experience with version control (Git + Git Flow) and CI/CD
• Knowledge of communication protocols such as UART, I2C, SPI and Ethernet (TCP/IP)
• Structured problem-solving skills and clear technical communication in English

Nice-to-have qualifications

• Experience with Fieldbus protocols (Modbus, BACnet)
• Experience with embedded displays (TFT, LCD)
• Knowledge of wireless protocols (Wi-Fi, BLE)
• Familiarity with IoT and embedded-system security principles
• Experience with unit testing frameworks for embedded systems or hardware-in-the-loop testing
• Understanding of cloud-connected embedded systems or IoT communication (MQTT, REST)

Working at OJ

At OJ Electronics, you’ll find an informal, open and collaborative culture where people take pride in doing quality work.

• A flat organisational structure where decisions are made quickly
• Opportunities to grow your expertise and responsibility over time
• A healthy work-life balance and flexible working hours (30–37 hours per week)
• Competitive salary and pension package
• A modern workplace with canteen and good facilities

Please note that this position is based in Sønderborg, Denmark, and requires your physical presence on site. This is not a hybrid or remote position.