Senior Firmware Developer — Smartcard & Mobile Credentials (m/f/d)

As a Senior Firmware Developer, you will design and implement C++ application firmware on microcontrollers (ARM Cortex-M) running an RTOS. Your focus will be on application-level features and the integration of physical and smartphone-based credential processing flows (Mifare DESFire, HCE, mobile wallets)., Implement C++ application-layer firmware on an RTOS (tasking, IPC, power-aware scheduling). Develop application logic for existing (Mifare DESFire) and future standards: app/file model, access conditions, personalization, and lifecycle management. Integrate NFC/BLE/WLAN stacks and mobile credential workflows (provisioning, HCE, revocation). Interface with secure elements / SAMs for key storage and transaction offload. Implement secure boot, signed/encrypted OTA, and application-level runtime protections. Enhance and maintain internal software suites (C++, C#). Build tests and CI/CD artifacts; use protocol sniffers and hardware debuggers for validation. Work closely with mobile, backend, hardware, and QA teams; produce technical and security documentation., +5 years of embedded firmware experience. Strong C++ experience for microcontrollers in resource-constrained environments and practical RTOS experience (Zephyr is an advantage). Hands-on RFID / NFC experience (ISO 14443, Mifare DESFire EVx preferred). Experience with smartphone credential flows (mobile wallets, HCE, provisioning). Familiarity with applied cryptography in embedded systems (secure messaging, AES/HMAC, k...

Fähigkeiten

C++, Embedded Systems, Zephyr, Bluetooth Lowenergy, Debugging