Sr. Software Development Engineer, Annapurna Labs

Amazon • Cupertino, CA

22h

About The Position

AWS Networking builds the infrastructure that powers every customer workload in
the cloud. ENA Express is a next-generation EC2 networking feature that
leverages the Scalable Reliable Datagram (SRD) protocol — developed by AWS — to
deliver industry-leading networking performance: dramatically lower tail
latency, higher bandwidth utilization, and consistent packet delivery at scale.

We are looking for a Senior Software Development Engineer to join the ENA
Express team. You will design, build, and own features across the full ENA
Express software stack: Firmware on the Nitro-Card, user-space libraries,
control plane components, and the performance analytics systems that help our
customers get the most out of their network. This is high-ownership work — your
code runs on a fleet of millions of EC2 instances, supporting customers who
demand the absolute best from their network, including HPC clusters, large-scale
ML training, financial services, and other latency-critical applications.

Requirements

• 5+ years of non-internship professional software development experience
• Bachelor's degree in computer science or equivalent
• Background in systems programming (C / C++) in performance-critical, production environments

Nice To Haves

• Experience in Linux and Networking protocols, or experience in Linux OS and network troubleshooting
• Experience in Linux and Networking protocols, or experience in Network protocols like DNS/DHCP/TCP and experience that includes strong analytical skills, attention to detail, and effective communication abilities
• Experience with virtualization (Hypervisors, VMware, Xen), or experience in managing and troublshooting network and experience in Network protocols like DNS/DHCP/TCP
• Experience working with software teams to tightly define the HW/SW interface, including control/status registers and error handling

Responsibilities

• Design and develop features across the AWS Networking software stack on Nitro Cards.
• Deep-dive into ENA Express and the underlying SRD protocol and L3/L4 networking to optimize packet delivery, reduce tail latency, and improve bandwidth utilization.
• Collaborate with hardware and firmware partners to define software/hardware interfaces and surface programmable capabilities to the software layer
• Partner with EC2 platform and service teams to integrate ENA Express features into the broader AWS networking ecosystem
• Mentor junior and mid-level engineers, lead design reviews, and champion engineering best practices across the team
• Drive operational excellence: build observability, contribute to on-call health, and lead incident response and post-mortems

Benefits

• health insurance (medical, dental, vision, prescription, Basic Life & AD&D insurance and option for Supplemental life plans, EAP, Mental Health Support, Medical Advice Line, Flexible Spending Accounts, Adoption and Surrogacy Reimbursement coverage)
• 401(k) matching
• paid time off
• parental leave

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level