Ultra-Low Latency Trading Infrastructure Engineer

Citi Group; Irving (TX); On-site; USD 180,000 - 280,000; Full time

Job summary

Citi is seeking a seasoned Low Latency Trading Infrastructure Engineer to design, implement, and optimize ultra-fast trading compute platforms. You will work at the intersection of hardware engineering, finance technology, and performance science to push nanosecond-level efficiency across the trading stack.

The role requires hands-on experience with bare-metal servers, kernel bypass, and high-performance networking, collaborating with trading desks and exchange partners to deliver deterministic

Qualifications

• Proven experience in low-latency infrastructure for trading.
• Strong knowledge of kernel bypass and NIC tuning.
• Experience with FPGA-enabled hardware and colocation setups.

Responsibilities

• Design low-latency compute topologies including bare-metal servers, NICs, kernel bypass technologies such as DPDK and FPGA/co-location hardware.
• Evaluate CPU microarchitecture, NUMA topology, cache behavior, and memory bandwidth for trading workloads.
• Define hardware and firmware standards with vendors like Dell, HPE, Mellanox/NVIDIA, Arista, Cisco, Juniper.
• Design and maintain custom server build patterns for the low-latency trading platform.
• Establish standards for low latency Linux, Windows, and Microservice infrastructure and tuning.

Skills

Low latency

DPDK

Kernel bypass

FPGA hardware

Bare-metal servers

NIC optimization

Benchmarking tools

Linux tuning

Tools

Dell servers

HPE servers

Mellanox/NVIDIA NICs

NVIDIA Networking

Arista networking

Cisco networking

Job description

Citi is seeking a seasoned Low Latency Trading Infrastructure Engineer to design, implement, and optimize ultra-fast trading compute platforms. You will work at the intersection of hardware engineering, finance technology, and performance science to push nanosecond-level efficiency across the trading stack.

The role requires hands-on experience with bare-metal servers, kernel bypass, and high-performance networking, collaborating with trading desks and exchange partners to deliver deterministic