AUTSORSA is a fast-growing company founded and based in Bulgaria, providing business outsourcing, outstaffing, and HR services to clients all over the world. Our client is a leading European semiconductor company developing cutting-edge AI chip infrastructure and software platforms that enable high-performance AI and data processing workloads. Their teams work end-to-end — from hardware architecture to low-level software — building complete solutions that power next-generation AI systems. If you are passionate about systems programming, performance optimization, and parallel computing , and want to work closely with hardware and AI teams on real-world, high-impact products, this is a great opportunity to join a fast-paced and innovative environment. We are looking for a Senior Software Engineer to join a highly skilled team developing software frameworks and tools for AI accelerators. What you’ll do: Develop and optimize low-level software components for AI and HPC workloads. Profile and analyze workloads to improve performance and scalability. Work on kernel optimization, parallel data processing, and inter-device coordination. Collaborate closely with hardware and AI teams to influence both software and hardware design. Contribute to emulation, performance analysis, software packaging, and distribution. Participate in continuous improvement of software architecture, tools, and workflows. Requirements: Required: 4+ years of experience in a Software Engineering role. Strong knowledge of C/C++ and Python . Solid experience with Linux environments. Hands-on experience with software profiling and performance analysis . Background in parallel programming and workload analysis . Strong problem-solving skills and attention to detail. Bachelor’s, Master’s, or PhD degree in a relevant field. English level C1 or higher . Nice to have: C/C++ and Python interoperability. Assembly experience (RISC-V, RISC-V Vector). Architecture-based optimization. CUDA or ROCm experience. Bare-metal programming. LLVM / GCC toolchains. AI application development experience. ONNX Runtime knowledge. Master’s or PhD degree. Why join us: Relocation package for you and your family (visa, flights, first-month rent, housing assistance). Permanent, full-time onsite role in Barcelona, Spain . Flexible working hours (Monday–Friday, 9–6). Work in one of the few European companies building AI chip infrastructure end-to-end . Small, highly skilled team with strong technical ownership. Supportive, family-friendly environment. Candies, coffee, and free Spanish lessons