High-Performance Trading Infrastructure Engineer

Citi Group; Jacksonville (FL); On-site; USD 170,000 - 260,000; Full time

Job summary

Citi is seeking a Low Latency Trading Infrastructure Engineer in Jacksonville to design and optimize enterprise-grade trading infrastructure. You will architect hardware-accelerated, low-latency systems and integrate them with Citi's secure, scalable platforms used across global markets.

In this role you will operate at the intersection of hardware, networking, and market data, driving nanosecond performance improvements while upholding Citi's standards for reliability and security.

Responsibilities

• Design low-latency topologies: bare-metal servers, NICs, kernel bypass (DPDK/Solarflare), FPGA/co-location hardware.
• Evaluate CPU microarchitecture, NUMA, cache behavior, and memory bandwidth for trading workloads.
• Define hardware/firmware standards with vendors (Dell, HPE, Mellanox/NVIDIA, Arista, Cisco, Juniper).
• Create custom server build patterns for the low-latency trading platform beyond Citi's standard catalog.
• Set standards for low-latency Linux/Windows and microservices, including OS optimizations and CPU isolation.
• Build benchmarking harnesses to measure tick-to-trade latency, jitter, and throughput.
• Tuning: CPU pinning, IRQ affinity, C-state/P-state, huge pages configuration.
• Correlate benchmarks with trading telemetry to validate production readiness.
• Drive packet capture analysis and latency telemetry across the trading stack.
• Architect high-performance colocation environments connecting venues and data feeds.

Job description

Citi is seeking a Low Latency Trading Infrastructure Engineer in Jacksonville to design and optimize enterprise-grade trading infrastructure. You will architect hardware-accelerated, low-latency systems and integrate them with Citi's secure, scalable platforms used across global markets.

In this role you will operate at the intersection of hardware, networking, and market data, driving nanosecond performance improvements while upholding Citi's standards for reliability and security.