Serbia-Senior Software Engineer - RISC-V Virtualization

Description NextSilicon is a swiftly growing unicorn startup that is reimagining high-performance computing. Our pioneering RISC-V and accelerator coprocessor vastly accelerates supercomputers, driving them forward into a new generation. Our new software-defined hardware architecture enables HPC and AI to fulfill its promise of breakthroughs in all advanced research fields. At NextSilicon, everything we do is guided by three core values: • Professionalism: We strive for exceptional results through professionalism and unwavering dedication to quality and performance. • Unity: Collaboration is key to success. That's why we foster a work environment where every employee can feel valued and heard. • Impact: We're passionate about developing technologies that make a meaningful impact on industries, communities, and individuals worldwide. We are seeking a highly skilled and experienced Software Engineer to join our team. In this role, you will be responsible for the architecture and implementation of virtualization support for our custom RISC-V implementation, ensuring our hardware-software synergy delivers maximum performance for virtualized workloads. Requirements • B.Sc in Electrical Engineering, Computer Science, or equivalent experience. • 7+ years of experience as a low-level software engineer. • Deep technical literacy: Ability to digest and implement complex technical specifications, specifically the RISC-V H-extension (Hypervisor). • Virtualization expertise: Solid understanding of virtualization fundamentals, including nested page-tables, virtualized I/O, and IOMMU logic. • Strong OS Internals: Proficiency in kernel-level development and memory management. • Strong, proven coding skills in C and C++. • Hardware-aware debugging: Ability to root-cause complex integration issues across the stack, distinguishing between software bugs, hardware errata, or spec misinterpretations. • Familiarity with Python for scripting and internal tooling — an advantage. • Experience with KVM, OpenSBI, or custom micro-hypervisors — an advantage. • A proactive, can-do approach and flexible mindset. • Excellent written and verbal communication skills. • Ability to work both independently and as part of a collaborative team. Responsibilities • Design and implement the virtualization layer and hypervisor support for our custom RISC-V implementation. • Take ownership of the H-spec implementation, ensuring our software stack is strictly compliant with (or intentionally extends) the RISC-V standard. • Develop and maintain hypervisor-level software to support guest execution, world-switching, and resource isolation. • Debug and resolve high-pressure integration issues between our evolving hardware and the software stack (KVM/Hypervisor). • Implement and optimize memory management strategies, including two-stage translation and I/O virtualization. • Collaborate closely with hardware teams to validate the H-extension and provide feedback on hardware design from a software perspective. • Wide system impact through collaboration with software engineers, hardware engineers, and other stakeholders.