What You'll Bring Required: * Strong experience with modern C++ * C programming experience * Working knowledge of Python * Experience with Linux environments * Multithreading experience * Software profiling and debugging (gdb) * Strong problem-solving skills and attention to detail * English proficiency at C1 level Nice to Have: * PyTorch dispatcher/ATen internals * vLLM * SGLang * CMake * LLVM/GCC * Hardware/software interfacing experience * Multi-GPU deployment * C/C++ and Python interoperability (pybind11) * ONNX Runtime execution provider (EP) registration * Open source contributions * CUDA/ROCm * AI kernel development * Bare-metal programming * AI application development * Workload analysis Why Semidynamics? * Join one of Europe's most promising deep-tech semiconductor scale-ups * Accelerated career development path * Hybrid model: 4 days/week at our Barcelona city-center office, 1 day WFH * 1 week per year of "work from anywhere in the world" * Competitive compensation package #J-18808-Ljbffr