SW engineer - AI frameworks (Senior)

Semidynamics' software team is extending support for our hardware into the tools and frameworks that enable clients to deploy AI applications. We're looking for software developers with strong C++ experience in complex, multi-layered projects, ideally with exposure to the interface between hardware and software. If you're passionate about performance, code quality, and solving complex technical challenges, you'll find real opportunities to grow here. You'll work side by side with our hardware and AI teams, with the chance to influence not just our software stack, but the direction of the hardware itself. What You'll Do • Design and build software components that integrate deeply with Semidynamics hardware • Work across multiple layers of complex systems, from low-level interfaces to higher-level frameworks • Collaborate closely with hardware and AI teams to shape both software architecture and hardware capabilities • Profile, debug, and optimize code for performance and reliability 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 levelNice 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 analysisWhy 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