Overview

Citi’s Equities Technology organization is seeking a Low‑Latency Java Data Systems Engineer to join the Equities Electronic Execution technology team. This role is focused on building and operating the data‑plane foundations of Citi’s electronic trading ecosystem. This role focuses on the low‑latency data plane that supports execution, routing, internalization, connectivity, and market data systems, providing event transport, sequencing, fan‑out, back‑pressure, replay, and latency‑controlled data distribution.

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 supp...