Posted October 22, 2026

Kdb+/Q Engineer

Citadel Securities

Category:Quantitative Development

Location:New York Dublin Hong Kong London Singapore Sydney

Seniority: Senior
Employment type: Full-time
Salary (per year): $175k–$350k
Bonus: Yes

Requirements

Strong experience developing production applications using Kdb+/Q at scale
Experience building market data, analytics, electronic trading, or quantitative research platforms
Proficiency in one or more programming languages such as Python, Java, or C++
Strong Linux and distributed systems knowledge
Ability to collaborate effectively with technical and front-office stakeholders
Bachelor's degree in Computer Science, Engineering, Mathematics, or a related technical field

About the role

As a Kdb+/Q Engineer within our Global Trading Applications team, you will design and build data and analytics platforms that power trading and quantitative research across global markets. Working closely with traders, quantitative researchers, and engineers, you will develop high-performance solutions for real-time and historical market data at significant scale. This role offers the opportunity to work on a large-scale Kdb+/Q environment supporting critical trading, research, and analytics workflows.

Opportunities may be available from time to time in any location in which the business is based for suitable candidates. If you are interested in a career with Citadel, please share your details and we will contact you if there is a vacancy available.

Responsibilities

Design and build high-performance Kdb+/Q platforms that support real-time research, streaming analytics, and trading workflows across global markets
Partner directly with traders, quantitative researchers, and engineers to deliver technology that drives business outcomes
Develop scalable solutions for large-scale market data, time-series analytics, and distributed computing challenges
Contribute to the architecture and evolution of our Global Trading Applications platform, which supports trading, data, and analytics workflows across the firm
Drive engineering excellence through thoughtful design, automation, and operational best practices

What you'll get

$175k–$350k base salary
medical and life insurance
retirement and tax-free savings plans
access to other healthcare programs

Skills

Kdb+/Q · Python · Java · C++ · Linux · distributed systems