Citi’s Equities Technology organization is seeking a Low‑Latency Java Data Systems Engineer to join the Equities Electronic Execution technology team. This role focuses on building and operating data‑plane foundations for Citi’s electronic trading ecosystem.

Responsibilities

• Design and build low‑latency Java data pipelines that process order lifecycle and market data events with strict guarantees around ordering, sequencing, determinism, and replay.
• Develop GC‑sensitive, data‑plane Java systems, using off‑heap memory, binary protocols, and low‑contention concurrency to achieve predictable latency.
• Implement resilient fan‑out, back‑pressure, and recovery mechanisms to support multiple downstream consumers without compromising latency or correctness.
• Work directly with FIX and exchange‑driven message flows, handling sequencing gaps, snapshot/replay, session lifecycle, and state reconstruction.
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