Freelance Embedded Software Engineer (Industrial Communications) โ 12โMonth Contract (Remote, Germany) Location: Fully Remote (within Germany) Engagement: Freelance / Contract Start Date: Rolling Start Requirement: Setup/ Eligibility to setup as Freelancer in Germany/ EU About the Project You will join a crossโfunctional engineering team developing the next generation of industrial Ethernet communication firmware used in automation controllers and edgeโconnected devices. The project focuses on implementing and optimizing an embedded protocol stack for PROFINET and EtherCAT communication modules used in highโreliability industrial environments. This is a greenfield + integration project: Building new features for an updated communications module Ensuring compatibility with leading industrial fieldbus standards Working closely with hardware, systems, and test teams to deliver productionโready firmware Key Responsibilities Design, develop, and optimize embedded C/C++ firmware for industrial communication devices Implement and maintain protocol stack components (e.g., PROFINET, EtherCAT, OPC UA, Modbus TCP ) Work with RTOS environments (e.g., FreeRTOS, ThreadX, Zephyr) and lowโlevel drivers Perform debugging, profiling, and performance tuning on embedded platforms Collaborate on system architecture decisions and contribute to technical design documentation Integrate firmware with custom industrial hardware (ARM CortexโM / CortexโAโbased MCUs) Support automated testing, simulation frameworks, and CI/CD pipelines for embedded systems Work with international teams across software, hardware, QA, and product management Ensure compliance with industrial standards and safety requirements Required Skills & Experience 5+ years of professional experience in embedded software development Strong proficiency in C and C++ (embedded focus) Handsโon experience with industrial communication protocols (one or more): PROFINET EtherCAT CANopen Modbus TCP OPC UA Solid understanding of RTOS , task scheduling, interrupts, and memoryโconstrained systems Experience with ARM-based microcontrollers and lowโlevel peripheral drivers (SPI, I2C, UART, DMA) Familiarity with embedded Linux is a plus Proficiency with debugging tools (e.g., JTAG, oscilloscopes, logic analyzers) Experience working in Agile development environments Strong English skills; German is a plus but not required Based in Germany for contract compliance requirements Experience with safetyโcritical or highโreliability systems (IEC 61508, ISO 13849) Familiarity with TSN (TimeโSensitive Networking) Knowledge of cybersecurity considerations in embedded systems (secure boot, encryption, etc.) Python scripting for automation or test development Experience contributing to open-source embedded or protocol stack projects #J-18808-Ljbffr