Sensorberg - Who?

Sensorberg is an innovative Berlin-based tech company that was founded in 2013.
We develop hardware and software for the digitalisation and automation of buildings. We specialise in solutions for storage, co-working spaces and commercial. We believe that a building is not just a building but a place where people spend more than half of their lives. Besides intelligent access systems, we equip buildings with a comprehensive digital infrastructure to provide occupants with the highest levels of safety, comfort and productivity, while enabling operators and owners to manage and utilize buildings with maximum efficiency.
We are a rather small company where people of different cultures and personalities come together and have (their) place. We are looking for people who share our vision and believe that a mix of qualifications, skills, personality and diversity is the basis for a transformative work process and the key to a successful system - in terms of people as well as technology. What we all have in common is a "hands-on" mentality, appreciation towards others and the ability to deal with (different) demands.

What's my role?

• You will drive the development and long-term support of our access control hardware product line. The hardware line contains includes an array of ESP32 devices including readers, actuators, and offline caching hardware.
• You will work closely with hardware engineers, product managers, and web platform teams to deliver robust, secure, and scalable embedded systems.
• Develop and integrate communication protocols (BLE, NFC, wired communication buses such as I2C, UART, RS485).
• Implement secure credential handling, device provisioning flows, OTA updates, and offline logic.
• Create high-reliability embedded solutions suitable for long-term field deployment.
• Support pilot installations and refine firmware based on customer environment findings.
• Develop automated testing strategies for firmware validation.
• And continuously improve firmware to enhance performance, security, and user experience.

What should I bring with me?

• 5+ years of professional experience in C programming for embedded systems.
• Strong background in RTOS-based development, including FreeRTOS or similar environments.
• Extensive hands-on experience with ESP32 SoCs and the ESP-IDF framework.
• Working knowledge of Nordic nRF52 series and associated toolchains.
• Proficient with Git and modern version control workflows.
• Experienced in CI/CD pipelines for embedded development, including integration of hardware-in-the-loop (HIL) testing.
• Skilled in automation scripting using Bash and Python.
• Solid understanding of networking and IoT protocols, including Wi-Fi, BLE, Ethernet, and MQTT.
• Practical experience implementing OTA update systems for IoT devices.
• Familiarity with update management platforms such as Hawkbit.
• Comfortable working in Linux-based development environments.
• Strong analytical and problem-solving skills, with a self-driven, solution-oriented mindset.
• Excellent English communication skills, both written and verbal.
• You take personal initiative and work with a solution-oriented approach
• You have an open and communicative way to round off your profile