**eleQtron** develops and operates full-stack quantum computers based on trapped-ion technology. Quantum computing is a new computing paradigm rapidly approaching commercial viability. Our unique approach combines laser-cooled trapped ions with microwave control and tailored magnetic fields. Our next-generation computing machines under development will be able to find solutions to problems that are out of reach today, thus enabling new innovative products and services for a brighter future.**We are looking for a Senior Embedded (ARM) Engineer (m/f/d) to join us in Hamburg or Siegen and own the real-time firmware that turns our control electronics into a working quantum computer. You will work on our next-generation system, where the control electronics are being integrated into a single, highly integrated chip. You sit at the heart of the machine, between the hardware that generates the pulses and the higher-level software that describes the experiments. Timing is not a detail here; it is the product. You are the person who makes sure the right signal reaches the ions at the right nanosecond, reliably, run after run.** **Responsibilities:*** Own the embedded firmware on our ARM-based control platform, from architecture through implementation to on-hardware debugging* Develop and maintain the real-time software layer that coordinates pulse sequencing, timing, and data flow across our highly integrated control chip* Write and maintain the low-level drivers and board support the hardware relies on* Guarantee deterministic, low-latency behaviour under hard real-time constraints* Lead firmware bring-up together with our electronics and physics teams, and debug at the boundary where software meets signal* Define the firmware architecture and engineering practices — build, test, and release processes for the embedded layer as the system matures* Contribute to the interfaces between the embedded layer and the rest of the stack, so experiments defined in software run correctly on the machine **Required Skills:*** 5+ years of professional embedded software development for real-time or timing-critical systems* Deep command of C (and ideally C++) on ARM platforms, working close to the hardware* Experience with bare-metal and/or RTOS environments, and a clear understanding of when each is appropriate* Comfortable reading schematics and datasheets, and debugging real hardware with oscilloscopes, logic analysers, and JTAG* Strong grasp of real-time concepts: interrupts, DMA, timing, concurrency, and determinism* A track record of bringing up firmware on new hardware, not only maintaining existing systems* Ability to collaborate effectively with experimental physicists and engineers, and to turn imprecise physical requirements into robust firmware* Strong adaptability and a quick learning mindset* Good proficiency in English (written and spoken)**Nice to have (Bonus)*** Experience on highly integrated SoCs, particularly ARM+FPGA platforms such as Xilinx Zynq / RFSoC* Working alongside FPGA/digital-electronics engineers at the software–gateware boundary* Rust for embedded systems* Embedded Linux on ARM (Cortex-A), including driver and kernel-module work* Signal processing or control-loop implementation on embedded targets* Experience with high-speed data acquisition or precision timing systems* Familiarity with laboratory, scientific, or measurement instrumentation* Prior experience with quantum computing or other deep-tech domains**What you can expect from eleQtron:*** **Competitive salary:** We value our team members and therefore provide remunerations that reflect this, additionally rewarding achievements* **Flexible working hours**: We offer personal freedom through a variety of flexible work schedules