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Job Overview

Citis Equities Technology organization is seeking a handson Senior Market Data Platform Engineer to join the Market Data Engineering team, focusing on the design and delivery of Citis nextgeneration realtime market data distribution platforms supporting global Equities trading, with a roadmap toward multiasset coverage over time.

The role sits within a horizontal Market Data platform organization responsible for delivering accurate, deterministic, and lowlatency market data to a broad set of internal consumers, including Electronic Execution (Algo/SOR), Market Access, and analytics platforms.

The senior engineer will be involved in handson system design and implementation, contributing to architectural decisions and ensuring adherence to latency targets while treating data correctness and determinism as nonnegotiable engineering outcomes. This includes deep ownership of wiretoconsumer latency, performance measurement, regression control, and OSlevel optimization required to achieve predictable behavior at scale.

This role requires close collaboration with trading desks, platform consumers, quantitative research, infrastructure, and regional teams globally. Alignment with global strategy and crossregional market coverage is a core part of the role. Prior experience with realtime market data systems and exchange microstructure across global venues is essential.

Responsibilities:

• Design and develop Citis nextgeneration realtime market data distribution platforms delivering normalized market data to multiple internal consumers across regions.

• Build and evolve performancecritical C++ components for market data ingestion, normalization, and fanout.

• Define and enforce platform standards for market data semantics, schemas, and correctness guarantees.

• Engineer the endtoend wiretoconsumer hot path, with explicit focus on NUMAaware design, core pinning / CPU isolation, lockfree concurrency, memory layout, and cache locality.

• Own operatingsystem and runtimelevel optimizations, including Linux kernel and network tuning, IRQ affinity, threading models, and performance profiling.

• Ensure deterministic performance under burst load, packet loss, and volatile market conditions.

• Use Aeron (or equivalent) for highperformance fanout and IPC, with handson responsibility for driver configuration, transport selection, and tuning. Own Aeron backpressure behavior, loss/replay semantics, and performance diagnostics to meet latency and correctness targets.

• Own latency measurement and observability using histograms (p50/p95/p99/p99.9) and tail analysis; establish baselines and alerting on distribution shifts.

• Drive high standards in code quality, automated testing, and SDLC discipline, with particular emphasis on correctness and latency regression safety.

• Leverage Citis AIpowered SDLC tooling to enhance productivity, code quality, and engineering effectiveness.

• Evolve Agile development practices and CI/CD pipelines, with a focus on shiftleft testing and safe, accelerated release cycles.

Qualifications:

• 12+ years of handson engineering experience building lowlatency, highthroughput systems, with strong proficiency in modern C++.
• Prior experience designing or owning realtime market data distribution platforms in a global financial institution (Equities required; multiasset a plus).

• Deep, handson experience with UDP multicast in production environments, including loss, recovery, and operational behavior.

• Strong understanding of lowlatency techniques, including NUMA, core pinning / CPU isolation, IRQ affinity, kernel and network tuning, memory management, and cache locality.

• Production experience using Aeron, including transport/driver tuning, backpressure management, loss/replay semantics, and performance diagnostics.

• Demonstrated ownership of wiretoconsumer latency observability, including histograms, tail analysis, and regression detection.

• Strong understanding of exchange microstructure and regional market structure differences across global venues.

• Ability to prioritize multiple initiatives and deliver in a fastpaced, globally distributed environment.

• Excellent communication skills, with the ability to reason about and clearly explain complex systems to engineers, quants, and trading stakeholders.

Education:

• Bachelor's degree / University degree in Computer Science, Engineering, or a related field, or equivalent professional experience.

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Job Family Group:

Technology

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Job Family:

Applications Development

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Time Type:

Full time

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Primary Location:

Jersey City New Jersey United States

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Primary Location Full Time Salary Range:

$176,720.00 - $265,080.00

In addition to salary, Citis offerings may also include, for eligible employees, discretionary and formulaic incentive and retention awards. Citi offers competitive employee benefits, including: medical, dental & vision coverage; 401(k); life, accident, and disability insurance; and wellness programs. Citi also offers paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays. For additional information regarding Citi employee benefits, please visit citibenefits.com. Available offerings may vary by jurisdiction, job level, and date of hire.

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Most Relevant Skills

Please see the requirements listed above.

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Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

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Anticipated Posting Close Date:

May 18, 2026

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Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi (opens in new window).

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