Senior HPC Developer - RDMA Networking

Clockwork.io•Palo Alto, CA

4d•$150,000 - $230,000

About The Position

We’re looking for a Senior HPC Developer who wants to grow in a startup environment while working on cutting-edge GPU and high-performance networking problems. You’ll work across multi-node, multi-GPU systems and have the opportunity to learn deeply across the full stack—from kernel and drivers to GPUs and networks. This role is ideal for someone who is hands-on, curious, and excited to learn by building and debugging real systems at scale.

Requirements

5+ years of experience in systems, HPC, or performance-critical software development
Strong proficiency in low-level C/C++
Solid understanding of RDMA networking, including InfiniBand, RoCE, and IBVerbs
Experience working with multi-node, multi-GPU workloads
Familiarity with collective communication libraries and communication algorithms
Ability and willingness to debug complex issues across hardware and software boundaries
Curiosity and eagerness to learn in a fast-moving startup environment

Nice To Haves

Experience with congestion control mechanisms such as DCQCN
Exposure to GPU-aware networking or advanced communication optimizations
Experience with performance profiling, tracing, or observability tooling
Background in AI infrastructure, HPC clusters, or distributed systems

Responsibilities

Build and optimize high-performance GPU and networking subsystems
Work with collective communication libraries and algorithms for multi-node, multi-GPU workloads
Debug performance issues across kernel, driver, GPU, and network layers
Develop and improve GPU-aware networking solutions
Profile, analyze, and tune system performance using low-level tooling
Collaborate closely with a small engineering team and take ownership of core systems