Develop and optimize AWS's SRD transport protocol powering EFA, EBS, and next-gen network infrastructure

Own design, deployment, and performance tuning of SRD (Scalable Reliable Datagram), the high-performance low-latency transport protocol underlying AWS's ML/HPC platforms and storage services. Heavy focus on network simulation, protocol-level troubleshooting, and mentoring within Annapurna Labs' software group.

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What this interview tests

Transport protocol design (reliability, latency, throughput tradeoffs)
Network simulation and performance evaluation methodology
Troubleshooting data loss/latency issues in production network infrastructure
Data-center networking and large-scale distributed systems
Technical leadership: architecture ownership and mentoring

Common question themes

Design tradeoffs in a low-latency, high-reliability transport protocol

Using simulation to find and fix a network bottleneck before hardware rollout

Debugging a real production network issue causing data loss or latency spikes

Leading architecture/design reviews for a new or evolving system

Mentoring junior engineers or leading a project as tech lead

How candidates describe it

Real Senior Network Software Engineer interview stories — retold from candidates' public write-ups, with sources.

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