Senior Linux Systems Engineer - Low Latency

We are looking for a Senior Linux Systems Engineer with strong experience in Linux systems, performance tuning, and low-latency environments. The ideal candidate will be responsible for optimizing and maintaining high-performance Linux infrastructure supporting trading and other latency-sensitive applications., * Design, configure, and maintain high-performance Linux servers and systems.

• Optimize Linux operating systems for low latency and high performance.
• Perform system-level tuning of CPU, memory, networking, storage, and I/O.
• Troubleshoot system performance, latency, stability, and production issues.
• Monitor system health, resource utilization, and application performance.
• Work closely with software developers, quantitative teams, and infrastructure engineers.
• Automate system administration and operational tasks using scripting.
• Support production environments and participate in incident resolution.
• Implement and maintain system security, reliability, and availability standards.
• Document configurations, processes, and performance-tuning practices.

• Strong hands-on experience with Linux, preferably RHEL/CentOS/Ubuntu.
• Strong understanding of Linux internals and system performance.
• Experience with CPU affinity, process/thread scheduling, NUMA, huge pages, and memory optimization.
• Strong knowledge of TCP/IP, networking, routing, and network performance.
• Experience with shell scripting and automation.
• Strong troubleshooting and performance-analysis skills.
• Experience with monitoring and diagnostic tools such as top, vmstat, iostat, perf, sar, and similar utilities.

Low-Latency / Trading Experience

• Experience supporting low-latency, high-performance, or real-time systems.
• Understanding of latency optimization and performance benchmarking.
• Experience with high-speed networking, kernel/network tuning, or specialized NICs is preferred.
• Exposure to electronic trading, financial markets, or trading infrastructure is a strong advantage.

Preferred Skills

• Experience with DPDK, Solarflare/AMD Pensando, Mellanox/NVIDIA, or other high-performance networking technologies.
• Knowledge of kernel tuning and Linux kernel configuration.
• Experience with C/C++ environments and application performance troubleshooting.
• Familiarity with Ansible, Python, Git, and CI/CD tools.
• Experience with cloud and/or bare-metal infrastructure is an advantage.