Senior Embedded Firmware Engineer

Senior Embedded / Firmware Engineer(RTOS, communication, critical systems, secure embedded systems)Scope of DutiesThis is not a typical embedded role. It involves designing systems, deterministic communication, real-time, and responsibility for key product elements.You will work from low-level firmware to backend communication.In practice this means:Development of firmware for security components and communication modulesDesigning and improving communication between two MCUsWorking with real-time logic, state machines, and error handlingCreating and maintaining hardware drivers (UART, SPI, I2C, GPIO)Designing and developing wireless communication systems (BLE onboarding, provisioning, data exchange)Ensuring stable communication with the backend through OCPP over WebSocket (or similar device-cloud protocols)Working on OTA and system resilience in the production environment (rollback, recovery, update security)Low-level debugging using professional tools (JTAG, SWD, logic analyzers, etc.)Designing APIs and communication layers between system modulesTechnology and ArchitectureThe system consists of two main units:Security/power controller: nRF5340 or similar low-power MCU (RTOS / embedded firmware)Communication/application controller: i.MX RT1061 or similar application-grade MCU (RTOS / embedded Linux optional)MCUs communicate through a proprietary protocol designed for determinism and consistency.Communication with the backend is realized based on OCPP over WebSocket or a similar device-cloud protocol.RequirementsVery good knowledge of C/C++ in embedded systemsExperience working with MCUs (e.g., STM32, nRF, ESP32, or similar)Knowledge of communication protocols: UART, SPI, I2C, and BLE (or other wireless)Experience in designing embedded systems (architecture, not just implementation)Ability to debug HW/SW systems (JTAG, SWD, system logs)Experience in designing interfaces and APIs between system componentsMilestone WelcomedExperience in secure embedded systems (device identity, secure update concepts, integrity, tamper resistance)Experience with OTA/bootloaders (rollback, recovery, update safety)Knowledge of RTOS systems (FreeRTOS, Zephyr, or others)Experience with device ? backend communication (WebSocket, MQTT, REST)Automotive/industrial embedded backgroundKnowledge of provisioning systems / fleet management / BLE onboardingNice-to-Have (but not required)Experience with OCPPZephyr RTOSEmbedded Linux (Buildroot / Yocto)Working Conditions100% remote work - you can work from anywhereB2B: up to 8,000 EUR net per monthFlexible working hoursCollaboration with an experienced system/firmware teamReal impact on the architecture and product development direction