Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech.
Citi is looking to hire a KDB+ Software Engineer into its Equities Global Data and Analytics group in Belfast , UK. This role involves designing, implementing, and deploying timeseries based software systems that offer our Equities Trading Clients with best-in-class Analytics. The engineer will be part of the Global team that captures trading, market data and computes pre-trade, at trade and post-trade analytics.
Responsibilities:
- Drive the design and development of real-time market data and analytics systems, leading KDB+/q development for trading and analytics platforms.
- Own technical delivery, and collaborate with Traders, Quants, and Global Technology teams to build high-performance, low-latency solutions.
- Utilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation
- Develop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goals
- Appropriately assess risk when business decisions are made, demonstrating consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency
- Conduct tasks related to feasibility studies, time and cost estimates, applications development, model development, and establish and implement new or revised applications systems and programs to meet specific business needs or user areas
- Monitor and control all phases of development process and analysis, design, construction, testing, and implementation as well as provide user and operational support on applications to business users
- Consult with users/clients and other technology groups on issues, recommend advanced programming solutions, and install and assist customer exposure systems
- Has the ability to operate with a limited level of direct supervision.
- Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency.
Recommended Qualifications:
- Significant relevant experience
- Proven experience working in KDB+/q
- KDB+ proficiency: Deep understanding and experience with KDB+ databases and the Q programming language.
- Programming Languages: Strong skills in Q/KDB+, Java and Python/PyKX,
- Good understanding of Linux/UNIX, OS tuning
- Knowledge of TCP/IP, UDP, Multicast and exchange specific protocols (FIX, OUCH, ITCH)
- Proven track record in profiling and optimizing for latency
- Strong debugging and trouble shooting skills, especially under production load
- Experienced in working within an agile framework to ensure timely product delivery
- Understanding of Market Microstructure, Connectivity, Smart Order Routers, Algorithmic Trading Systems will be a plus.
Education:
- Bachelor’s degree/University degree or equivalent experience
This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.
What we’ll provide you
By joining Citi Belfast, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:
27 days annual leave (plus bank holidays)
A discretional annual performance related bonus
Private Medical Care & Life Insurance
Employee Assistance Program
Pension Plan
Paid Parental Leave
Special discounts for employees, family, and friends
Access to an array of learning and development resources
Visit our Global Benefits page to learn more.
Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.
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Job Family Group: Technology------------------------------------------------------
Job Family:Applications Development------------------------------------------------------
Time Type:Full time------------------------------------------------------
Most Relevant Skills Please see the requirements listed above.------------------------------------------------------
Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------
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.
View Citi’s EEO Policy Statement and the Know Your Rights poster.
Skills Required
- Significant relevant software engineering experience
- Proven experience working with KDB+/q
- Deep understanding of KDB+ databases and the Q programming language
- Strong skills in Q/KDB+, Java, and Python/PyKX
- Good understanding of Linux/UNIX and operating-system tuning
- Knowledge of TCP/IP, UDP, Multicast, and exchange protocols including FIX, OUCH, and ITCH
- Experience profiling and optimizing for latency
- Strong debugging and troubleshooting skills under production load
- Experience working within an agile framework
- Bachelor's degree, university degree, or equivalent experience
- Understanding of market microstructure, connectivity, smart order routers, and algorithmic trading systems
Citi Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Citi and has not been reviewed or approved by Citi.
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Healthcare Strength — Benefits coverage is positioned as comprehensive, including health, dental, and vision insurance plus on-site clinics, prescription drug support, and disability coverage. Family-building support such as fertility assistance is described as a notable differentiator within the overall package.
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Retirement Support — Retirement benefits are framed as strong, highlighted by a 401(k) with matching and additional plan options like a Roth 401(k). Financial support is reinforced through discounts and broader financial guidance resources tied to the benefits ecosystem.
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Wellbeing & Lifestyle Benefits — Wellbeing support extends beyond insurance through programs like an Employee Assistance Program, counseling/legal resources, and gym or wellness reimbursement. These offerings increase the perceived total rewards value even when cash compensation sentiment varies by role.
Citi Insights
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