Senior HPC Developer - RDMA Networking

Responsibilities

• workload fault tolerance
• RDMA networking and storage data paths, spanning compute hosts, NICs,
• DPUs, smart switches
• Design, build, and optimize
• high-performance RDMA networking and storage systems
• Work with
• RoCE, RDMA Verbs, and NVMe-over-Fabrics
• Develop systems that leverage
• DPUs, SmartNICs, and programmable switches

for packet processing, telemetry, control, and data-path acceleration

• Develop and optimize software using queue pairs, completion queues, memory registration, zero-copy I/O, and other RDMA primitives
• Debug performance and reliability issues across applications, Linux kernel, drivers, NICs, DPUs, switches, and storage systems
• Analyze network and storage behavior including latency, throughput, queueing, congestion, packet loss, retransmissions, and flow control
• Develop mechanisms to improve network performance and congestion behavior in high-bandwidth RDMA fabrics
• Build tooling and instrumentation to understand end-to-end performance across compute, network, and storage
• Profile and tune systems across PCIe, NUMA, CPU, memory, NIC, DPU, network, and storage boundaries
• Own major components from design through implementation, performance validation, and deployment

Requirements

• 5+ years of experience
• in systems, networking, storage, HPC, or other performance-critical software development
• Strong proficiency in
• low-level C/C++
• Strong understanding of

RDMA networking, including

• Strong understanding of networking fundamentals, including packet processing, queues, congestion, and flow control
• Experience debugging low-level Linux networking, storage, or driver behavior
• Familiarity with concepts such as DMA, memory registration, queue pairs, completion queues, interrupts/polling, and zero-copy I/O
• Experience profiling and optimizing latency- and throughput-sensitive systems
• Ability to reason across hardware and software boundaries and independently debug complex system-level problems
• Strong ownership and comfort working in a small, fast-moving engineering team

Preferred

• DPUs, SmartNICs, or programmable network hardware
• Experience with platforms such as
• NVIDIA BlueField
• or programmable switch environments
• P4, switch SDKs, or in-network packet processing
• NVMe, NVMe-oF, NVMe/RDMA, or NVMe/TCP

We’re looking for a

Senior Systems Engineer – RDMA Networking & Storage to help build and optimize high-performance infrastructure for AI and HPC systems.

You’ll work across, storage systems, and the Linux software stack. The work includes RoCE networking, NVMe-over-Fabrics, congestion control, performance optimization, programmable network hardware, and debugging complex interactions across hardware and software.

This role is ideal for an experienced systems engineer who enjoys working close to the hardware, diagnosing difficult performance problems, and building reliable systems where latency, throughput, and network behavior matter.

What You Bring

RoCE and RDMA Verbs

SPDK

• , DPDK, or other userspace I/O frameworks
• Experience with Linux NVMe and RDMA subsystems

Experience with

congestion control, including DCQCN, ECN, PFC, or related mechanisms

Experience tuning NVIDIA/Mellanox ConnectX NICs and RoCE fabrics

• Experience working with high-performance switches and data-center network fabrics
• Experience with PCIe, NUMA, huge pages, DMA, or CPU affinity optimization
• Experience with performance profiling, tracing, or observability tooling
• Background in AI infrastructure, HPC clusters, distributed storage, or large-scale data-center systems
• Enjoy
• Challenging, technically deep projects
• A friendly and inclusive workplace culture

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.

Clockwork Systems is an equal opportunity employer.

We are committed to building world-class teams by welcoming bright, passionate individuals from all backgrounds. All qualified applicants will receive consideration for employment without regard to race, color, ancestry, religion, age, sex, sexual orientation, gender identity or expression, national origin, disability, or protected veteran status. We believe diversity drives innovation, and we grow stronger together.