Software Development Engineer, Annapurna Labs

About the role

We are looking for a 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.

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.
• Drive operational excellence: build observability, contribute to on-call health, and lead incident response and post-mortems.

About the team

We are a team of senior engineers with deep expertise in systems software, networking protocols, and EC2 infrastructure. Our work spans the full stack — from the Firmware on the driver Card, and NIC driver layer up through the EC2 control plane — and we collaborate closely with hardware, firmware, and platform partners. We care deeply about technical craft, operational quality, and each other’s growth.

Requirements

• 2+ 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.

Preferred Qualifications

• Experience in Linux and Networking protocols, or experience in Linux OS and network troubleshooting.
• 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 troubleshooting 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.

Pay

USA, CA, Cupertino - 165,200.00 - 223,600.00 USD annually.

Benefits

• Sign-on payments and restricted stock units (RSUs).
• Health insurance (medical, dental, vision, prescription, Basic Life & AD&D insurance and option for Supplemental life plans).
• Employee Assistance Program (EAP) and Mental Health Support.
• Medical Advice Line and Flexible Spending Accounts.
• Adoption and Surrogacy Reimbursement coverage.
• 401(k) matching.
• Paid time off and parental leave.

Learn more about our benefits at https://amazon.jobs/en/benefits.