Embedded Software Engineer Linux kernel, EFA

Are you passionate about systems programming at the intersection of hardware and software Do you want your code to directly accelerate the worlds largest AI training and inference workloads The Elastic Fabric Adapter (EFA) Drivers team is looking for Software Development Engineers to design and implement the kernel drivers and userspace libraries that power high-performance networking for AWSs AI/ML and HPC infrastructure.

EFA is the custom network interface that enables thousands of GPUs and accelerators to communicate at near-wire-speed bandwidth and low latency making it a critical enabler of both foundation model training and real-time inference serving at unprecedented scale. When customers train the next generation of large language models or serve billions of inference requests with tight latency SLAs on Amazon EC2 P5 P6 or Trn instances its our driver stack that moves the data.

Key job responsibilities
- Design develop and optimize Linux kernel drivers (RDMA/EFA) and userspace provider libraries (rdma-core) that ship to millions of EC2 instances
- Work directly with custom hardware collaborate with chip designers to bring new silicon capabilities to life in software
- Contribute to the upstream Linux kernel RDMA subsystem and rdma-core open-source project
- Architect solutions for next-generation networking features: GPU-direct RDMA adaptive routing collective offloads and multi-path transport
- Build monitoring and automation tools to enhance driver testing for functionality reliability and performance
- Own the full lifecycle: from initial hardware bring-up and feature enablement through testing deployment and production troubleshooting across the global AWS fleet

- Bachelors degree in Computer Science Engineering Mathematics or a related field
- 3 years of non-internship professional software development experience in C/C
- Experience contributing to the architecture and design (architecture design patterns reliability and scaling) of new and current systems

- 3 years of full software development life cycle including coding standards code reviews source control management build processes testing and operations experience
- Experience in debugging profiling and implementing software engineering best practices in large-scale systems
- Experience writing low level drivers
- Experience with DMA PCIe or hardware/software co-design
- Contributions to open-source projects or upstream kernel work

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