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Role Overview 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. Locations New York, Dublin, Hong Kong, London, Singapore, Sydney 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 Qualifications 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 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. About Citadel Securities Citadel Securities is a technology-driven, next-generation global market maker. We provide institutional and retail investors with world-class liquidity, competitive pricing and seamless front-to-back execution in a broad array of financial products. Our teams of engineers, traders and researchers harness leading-edge quantitative research and the accelerating power of compute, machine learning and AI to power our analytics and tackle the market’s and our clients’ most critical challenges. Together, we are forging the future of capital markets. For more information, visit citadelsecurities.com.
Here's how to pick the right one and stand out in your application.
144.883Jobs
31.687IN
81%EN
That number is real. WorkMundi's database shows 144,883 open engineer roles across the world. India has the most with 31,687 jobs, followed by the United States with 30,084. If you just finished reading one job ad and felt paralyzed by choice, you're not alone—but this scale is actually an advantage. It means you can afford to be selective.
Start by geography and language. The majority of engineer ads—117,837 of them—have the job posting text written in English. Use that as one filter, but remember: the ad text language tells you nothing about whether the role actually requires you to speak English day-to-day. Read the job description carefully. Then check which countries have the volume you're targeting. Singapore, Poland, and Australia round out the top five after India and the US.
Next, learn who's hiring. Accenture has posted 2,801 engineer roles. andurilindustries, speechify, and jobgether are also actively recruiting. If you're applying to one of these names, research their hiring patterns and interview style before you apply. That homework pays off.
When you interview, expect the question every engineer hears: 'Tell me about a time you had to debug a problem that wasn't in your job description.' Have a specific story ready—not a general one. Name the tools, the deadline pressure, and what you learned. Hiring managers listen for whether you see problem-solving as part of the role itself, not a favour.