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Amazon · Cupertino, CA

# Software Development Engineer, Annapurna Labs

US, CA, Cupertino Software Engineering 

Listed on Amazon’s official careers site. Posted July 30, 2026. Check that it is still open and apply there.
[Apply on Amazon’s careers site →](https://www.amazon.jobs/en/jobs/10488655/software-development-engineer-annapurna-labs)

[OpenNash Jobs](https://jobs.opennash.com/) / [Amazon](https://jobs.opennash.com/companies/amazon/) / Software Development Engineer, Annapurna Labs

## Job description

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 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.

### Key job 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.

## At a glance
- Posted by the employer: Jul 30, 2026
- First seen by OpenNash: Oct 18, 2026
- Last checked: Oct 18, 2026
- Listed for: 80 days
- Location: US, CA, Cupertino[Apply on Amazon’s careers site →](https://www.amazon.jobs/en/jobs/10488655/software-development-engineer-annapurna-labs)

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