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  The Role   The Electronics Design Engineer will be a member of the hardware team delivering low ‑ noise, high ‑ frequency mixed ‑ signal  control  and instrumentation for our QKD systems. The role spans end ‑ to ‑ end board design in Altium (schematics, layout, DFM/DFT), precision analog signal chains, prototype bring ‑ up/validation, and, where needed, STM32 (F4/H7) firmware in C for control, calibration, and integration. You will work with existing automated measurement software in Python and extend it where needed, collaborate closely with optics, FPGA, and software, and support manufacturing.   The Responsibilities   The Electronics Design Engineer should expect to work in the following activities.   Hardware design, prototyping, and validation   Owning hardware architecture and component selection for precision, lownoise, and highfrequency performance   Designing lownoise analog and mixedsignal schematics and PCB layout in Altium   Managing prototype builds and vendors; executing bringup; precision and highfrequency measurements (DC accuracy, noise spectral density, longterm drift, frequency response); lab debug and reworks   Working with existing automated measurement software (Python) and extending it where needed   Firmware development on STM32 and interfacing in Python (secondary scope) Designing and modifying STM32 F4/H7 firmware in C (HAL) Interfacing with Python drivers/scripts for control and data acquisition   Test automation and CI Building and extending automated board/firmware test setups (Python; instrument control via VISA/SCPI through the existing automated measurement software) to capture logs/metrics Establishing repeatable build/test pipelines for firmware and board validation; archiving artifacts, measurements, and calibration data   Manufacturing support and releases Producing manufacturing packages; supporting vendors through fabrication and assembly; designing/maintaining simple test fixtures Owning hardware/firmware versioning and release notes; maintaining traceable revisions   Cross ‑ team collaboration and documentation Collaborating with optics/FPGA/software on interfaces, calibration, timing/latency budgets, and integration Authoring design docs, analyses and budgets, calibration/bringup procedures, and change logs Maintaining detailed experimental documentation in Confluence   The Requirements   The Electronics Design Engineer is expected to have the following qualifications and experience.   5+ years analog/mixedsignal electronics design for R&D/instrumentation; strong Altium for schematics and PCB layout; DFM/DFT   Deep analog fundamentals: lownoise signal chains (e.g., highfrequency TIAs/preamps, ADC drivers, antialiasing/reconstruction filters), precision references/measurements, grounding/guarding/shielding, lowleakage layout   Ability to set/close noise and error budgets; tolerance/Monte Carlo and worstcase analysis; SPICEclass simulation (LTspice/PSPICE, etc.)   Lab expertise: precision/HF measurements (DC accuracy, noise spectral density, longterm drift, frequency response, temperature dependency); oscilloscopes, spectrum analyzers; VNA as applicable   Awareness of EMC/EMI and safety constraints; designforcompliance and precompliance testing   Python for lab/test automation and instrument control; Git ‑ centric workflow   Proficiency in written and spoken English   Ability to be on ‑ site in Munich or Potsdam off