Low Latency Infrastructure Engineering, Equities Trading, Director

** Role Overview:*
* Citi Equities Technology is seeking a senior leader for its low-latency infrastructure engineering group. The person in this role will be responsible for design, architecture & delivery of Citi's trading infrastructure across colocation sites and strategic data center assets.

This role requires a combination of deep technical expertise in low latency infrastructure and networking systems, trading microstructure knowledge and strong leadership and execution capabilities. The successful candidate will lead a global engineering team to deliver platform infrastructure in close partnership with the software delivery teams, Citi's enterprise technology group and trading functions.

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* Key Responsibilities:

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* + Define and execute the strategic roadmap for low latency trading infrastructure across

Global Equity Markets.

+ Architect and deliver high performance colocation environments,connecting exchange venues, market data providers, and internal trading systems.

+ Lead design and implementation of ultra-low latency Layer 1/Layer 2 network infrastructure between exchange colocation facilities and Citi data centers.

+ Drive selection, evaluation, and deployment of cutting-edge low latency switching, routing, timing, and telemetry technologies.

+ Work withvendorspartners, exchange providers, telecom carriers, and hardware manufacturers to optimize connectivity, resiliency, and performance.

+ Design resilient cross-connect and market access strategies across global exchanges and liquidity venues.

+ Establish standards for low latency Linux infrastructure, including

Operating System optimization, kernel bypass technologies, CPU isolation, NUMA optimization, interrupt tuning, and deterministic performance engineering.

+ Lead engineering teams responsible for infrastructure provisioning, bare-metal automation, deployment pipelines, hardware lifecycle management, and production engineering.

+ Develop scalable operational models enabling rapid deployment of trading infrastructure, including procurement workflows, capacity management, rack design, and colocation expansion.

+ Build highly secure and compliant environments aligned with Citi operational, cyber, and regulatory requirements.

+ Collaborate with application engineering teams to optimize end-to-end trading latency and infrastructure determinism.

+ Drive observability, performance benchmarking, packet capture analysis, and latency telemetry across the trading stack.

+ Manage relationships with exchanges, telcos, connectivity providers, and colocation operators globally.

+ Lead incident management and infrastructure resiliency programs for mission-critical trading environments.

+ Mentor and develop senior engineers and technical leads across infrastructure and platform engineering disciplines.

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* Required Qualifications:

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* + 15+ years of experience in low latency infrastructure engineering within electronic trading, capital markets, hedge funds,trading venues or equivalentfinancial institutions.

+ Proven experience building and operating exchange colocation environments for Equities or multi-asset electronic trading platforms.

+ Deep expertise in low latency network design, including:

+ Arista, Cisco, Juniper, or equivalent ultra-low latency switching platforms

+ Layer 1 optimization

+ Multicast market data distribution

+ Precision timing/PTP

+ Optical transport and cross-connect architecture

+ Exchange connectivity design

+ Strong understanding of modern low latency hardware platforms, NICs, FPGA-enabled environments, and packet processing optimization.

+ Advanced Linux systems engineering expertise, particularly:

+ RHEL&Kernel tuning

+ CPU pinning and isolation

+ IRQ balancing

+ NUMA optimization

+ DPDK/XDP/kernel bypass technologies

+ Deterministic systems performance tuning

+ Experience designing resilient infrastructure across colocation facilities and large-scale enterprise data centers.

+ Strong knowledge of automation and infrastructure engineering practices using Python, Ansible, CI/CD pipelines, and infrastructure-as-code methodologies.

+ Experience managing hardware procurement, vendor negotiations, colocation buildouts, and telecom contracts.

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