Job Description: We are looking for a Senior Java Backend Developer to join the Margin Calculation technology team within Prime Services. Our platform processes large volumes of financial data and applies complex business rules to calculate client margin requirements and support the firm’s risk management. The role involves hands-on Java development, technical design, performance optimization, and end-to-end ownership of business-critical functionality. You will work closely with developers, business analysts, risk, and operations teams across multiple regions. This is a senior role with opportunities to influence platform design, mentor other developers, and improve engineering practices. Responsibilities • Design, develop, test, and deliver Java applications supporting margin calculation. • Translate complex financial requirements into accurate, maintainable, and well-tested solutions. • Lead technical design for significant enhancements and contribute to the platform’s technical roadmap. • Optimize calculation performance using concurrency, multithreading, parallel processing, caching, and efficient database access. • Develop high-volume batch and event-driven processing workflows. • Review code and designs, establish development standards, and mentor other engineers. • Own deliverables throughout the development lifecycle, from requirements analysis through production implementation. • Investigate production issues, perform root-cause analysis, and implement long-term fixes. • Improve monitoring, resiliency, operational support, and recovery processes. • Partner with global technology and business teams to manage dependencies, risks, and delivery commitments. • Ensure solutions meet security, regulatory, audit, and technology-control requirements. Required Qualifications • 7+ years of professional software development experience, with strong hands-on Java expertise. • Advanced knowledge of core Java, including collections, streams, concurrency, multithreading, synchronization, and memory management. • Strong experience with Spring, particularly Spring Boot, Spring Batch, Spring Integration, and Spring Data. • Experience building high-volume, calculation-intensive, or distributed applications. • Strong understanding of algorithms, data structures, design patterns, and clean-code principles. • Experience with Kafka, JMS, or similar messaging technologies. • Strong SQL and relational database experience. • Experience with JUnit, Mockito, test-driven development, and automated integration testing. • Proven experience troubleshooting and improving application performance. • Proficiency in Linux, Git, CI/CD, and production-support practices. • Working knowledge of Docker and Kubernetes. • Ability to lead technical delivery and communicate effectively with both technical and business stakeholders. Preferred Qualifications • Experience with margin, collateral, risk, pricing, Prime Services, or other financial platforms. • Experience developing calculation engines or implementing complex business rules. • Experience with large-scale batch processing and job scheduling. • Experience with Apache Geode, GemFire, or another distributed caching technology. • Familiarity with Hibernate, JPA, Jackson, and related Java frameworks. • Experience modernizing complex or legacy applications. • Experience with application monitoring, logging, alerting, and performance profiling. Education Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience What we’ll provide you In addition to salary, Citi’s 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. 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. ------------------------------------------------------ Job Family Group: Technology------------------------------------------------------ Job Family: Applications Development------------------------------------------------------ Time Type: Full time------------------------------------------------------ Primary Location: New York New York United States------------------------------------------------------ Primary Location Full Time Salary Range: $142,320.00 - $213,480.00 In addition to salary, Citi’s 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. ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above.------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------ Anticipated Posting Close Date: ------------------------------------------------------ Automated Processing and AI We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi.   Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details.   Illinois residents – AI Notice and Right ------------------------------------------------------ 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.