Kernel/HypervisorEngineer,Firecracker

Join us at AWS Lambda in Dublin, Ireland, building Firecracker - the open-source virtual machine monitor (VMM) purpose-built for serverless and container workloads. Firecracker runs at global scale as the foundation of AWS Lambda, Aurora D-SQL, and other AWS services, and is integrated by 10+ external teams as part of their platforms. We are looking for a Kernel / Hypervisor Engineer who is passionate about low-level systems programming and wants to push the boundaries of virtualization technology. In this role, you will work at the intersection of hardware and software - designing and implementing hypervisor components, device emulation, memory management, and guest-host interfaces in Rust on Linux/KVM. Your work will directly impact the security, performance, and efficiency of compute infrastructure serving millions of customers. Key job responsibilities * Design, develop, and maintain hypervisor and VMM components in Rust, including virtual device emulation, memory management, and vCPU scheduling. * Optimize boot latency, memory footprint, and I/O throughput for ephemeral microVM workloads at global scale. * Harden the security boundary between guest and host, contributing to threat modeling and implementing isolation mechanisms. * Contribute to the upstream Linux kernel where needed to support Firecracker's roadmap. * Mentor and coach junior engineers, drive code quality through reviews, and champion best practices. * Participate in on-call rotation to ensure operational excellence of Firecracker-based services. A day in the life Your day might start by reviewing pull requests on the Firecracker open-source repository, providing feedback to community contributors or teammates. You then dive into implementing a new virtio device or optimizing a hot path in the VMM, writing Rust and reasoning about memory safety and performance trade-offs. After lunch, you collaborate with an internal AWS service team that consumes Firecracker to debug a subtle guest-host interact