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Job Overview
eTrading Infrastructure Systems Architect - Low Latency Engineering (Rates Tech)

Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech.

About the Position:
We are looking for an industry wide Senior Systems Architect (Infrastructure) who can provide leadership and direction for Change-The-Bank (CTB) electronic trading infrastructure initiatives covering all technologies (in this specific domain) for Rates.
The role sits within Citi’s Global Markets: High Performance Architectures - Infrastructure (HPAi) group. This team is responsible for all electronic trading infrastructure architecture across all markets globally for the firm. It is composed of low latency Subject Matter Experts (North America, EMEA), Systems Architects (both regional and asset class aligned) and an aligned initiative management function (e.g. Technical Project Manager). Technology is key to our business; this role will require you to drive innovation and technology adoption in a large multi-faceted and complex environment. This Markets-Tech "business aligned tech" resource will collaborate with ICG-Markets "the business", CTI "Enterprise Infrastructure", and CISO "Security" teams driving technical architecture and engineering of CTB and End of Vendor Support (EoVS) initiatives where we choose to innovate.

What you will do (but not limited to)
Reporting to the head of HPAi, the Systems Architect will be responsible for ensuring best in breed technology architecture and engineering are in alignment with business requirements. This will be done in collaboration with CISO and other teams and resource aligned to HPAi who represent Enterprise and CISO priorities and standards.
Active collaboration with all parties is required to be successful. The resource should be able to effectively collaborate with the Markets-Tech Electronic Trading organization (our clients), steer other technology organizations directly or through influence, and love rolling up their sleeves and working as an individual contributor.
The resource will leverage the full strength of the supporting non-ICG technology organizations (dedicated and non-dedicated to HPAi).
The role is very broad requiring a resource that is not afraid to do new things and be challenged on a regular basis with a can-do attitude and an engineering mindset.
You will show a deep desire to drive results and an unquenchable desire to understand how technology primitives work (and how to abuse them).
Low Latency Trading - Rates and Cross Markets, domain specific technology is required (solid knowledge for as many of the following as possible):

The Technologies:
*Compute (Linux, CoreOS, Tuning, kernel bypass technologies, core dump analysis)
*Network (R&S, cut-through, Multicast, SDN, BGP, L1-L3, PCAP analysis)
*HPC File Systems (Lustre, GPFS, Weka, DDN, Ceph)
*Interconnects (InfiniBand, Slingshot, PCIe, NVLink, UALink, UPI, RoCE)
*HW (Server, FPGA, GPU, Memory, Cache, over clocking, cooling, ASIC, Quantum, NUMA)
*DevOps (OpenShift, Kubernetes, DevOps, Prog[Python, Perl, Shell], CI/CD)
*Programming (C, C++, Java, Rust, VHDL, Verilog)
*Time Sync (PTP, NTP, GPS, White Rabbit, SyncE)
*Wave (RF, Millimeter, Microwave, DWDM, Photonics)
*Storage (I/O, NAS, SAN, Object Store, SDS)
*Database (relational, columnar, graph, NoSQL, architecture, tuning)
*Monitoring (SPANs, TAPS, OEO, Packet Brokers, Corvil, SNMP, FIX, Logs, ELK, Open Telemetry, Grafana, Promethius)
*Messaging (TibRV, Solace, Aeron, ZeroMQ, Kafka, Multicast, Market data (TCP/UDP), Tibco, Exegy/Vela)
*Load Balancers (HW, SW)
*Security (Firewalls, PKI, TLS, IDS, Optical Encryption, AD, LDAP)
*Connectivity (WAN, Lucera, cross-connects, ECX, venue, client)
*Colo / Datacenter (Power, Space, Cage, Rack, Cabinet, Design)
*Excel (for advanced frameworks, data analysis)
Required: *Low Latency Trading - Rates and Cross Markets, domain specific technology is required
*Deep knowledge of operating system fundamentals - hyper focus on Linux (REL, CoreOS)
*Understanding of OSI model and TCP and UDP network protocols
*Experience with Python and data libraries
*Fluency with the Unix command line and shell scripting
*Practical experience with modern Linux systems and systems programming concepts like C, IPC mechanisms, virtual memory, and process life cycle
*Strong troubleshooting skills and knowledge of profiling/debugging tools such as gdb, perf, DTrace, SystemTap
*Can understand, interpret, and improve application performance via system tuning
*Thorough understanding of modern computer architecture - modern x86 AMD and Intel cache hierarchies as an example.
*Kernel-bypass technology knowledge (such as Solarflare OpenOnload / TCPDirect / ef_vi, RoCE, DPDK)
*Prior experience in a similar Site Reliability Engineering (SRE), DevOps, distributed computing, systems engineering/administration
*Ability to context switch to work on several projects at once
*Knowledge of JIRA, SCRUM, Sprints
The Details: *Ingress/plan/execute/manage technical initiatives to make our electronic trading systems faster, more adaptable stable and maintainable aligned to HPAi standards.
*Communicate ideas, requirements, and results across disparate teams.
This position will support technical populations (Rates), p