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 with multi-node, multi-GPU workloads
Familiarity with collective communication libraries and algorithms
Ability to debug complex issues across hardware and software boundaries
Curiosity and eagerness to learn in a fast-moving startup environment
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
Benefits
Challenging projects
Friendly and inclusive workplace culture
Competitive compensation
Great benefits package
Catered lunch
Full Job Description
About the Role
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. What You'll Do
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
What You Bring
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
Bonus Points
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
Enjoy
Challenging projects.
A friendly and inclusive workplace culture.
Competitive compensation.
A great benefits package.
Catered lunch.
Compensation for this position will vary based on the skills and experience you bring, as well as internal equity considerations. For candidates hired at the posted level, the expected base salary range is $150,000 - $230,000. The offered compensation package may also include stock options or other equity awards, subject to Clockwork's equity program and applicable approvals.
About Clockwork Active Media
Clockwork Active Media is a digital marketing agency that specializes in creating engaging content for brands. The company was founded in 2002 by Jason Brush and is headquartered in Chicago, Illinois. Clockwork's services include content strategy, user experience design, and digital marketing. The company has worked with a variety of clients, including Microsoft, Nike, and Samsung. Clockwork is committed to creating innovative solutions that help brands connect with their audiences in meaningful ways.
