Senior Java Developer Assistant Vice President

Job Summary   At Citi, we believe in the power of engineering to drive success and foster a culture where innovation, collaboration, and professional growth thrive.   Join Citi's Oasys Financial team as a Senior Java Developer and take a pivotal role in a landmark modernization project. Oasys is Citi’s core sub-ledger system for the   Over-the-Counter   (OTC) business, processing millions of trades daily. We are embarking on a major strategic initiative to transform this key platform, moving it from a legacy system built on shell scripts into   a state -of-the-art   architecture based on modern Java microservices.   We are   seeking   a highly skilled and motivated technical leader to drive the design, development, and delivery of our next-generation financial accounting systems, ensuring they meet the highest standards of scalability, performance, and security.     Key Responsibilities   As a Senior Developer, you will be a technical leader at the heart of this transformation. Your duties will include:   Re-Architect and Modernize:  Lead the re-architecture of our legacy financial ledger, migrating complex business logic from shell scripts and stored procedures into a modern, event-driven platform built on Java microservices.   Hands-On Development:  Design, develop, and implement high-performance, scalable, and secure Java applications that will form the new backbone of our financial systems.   Champion Code Quality:  Write clean, well-documented, and thoroughly testable Java code. Act as a champion for software engineering best practices, including Object-Oriented Design, SOLID principles, and Test-Driven Development (TDD).   Database Integration:  Collaborate closely with database teams to design and implement strategies for data integration and migration as part of the transition to the new Java architecture.   Problem Solving:  Act as a key technical expert, troubleshooting and resolving complex issues that arise during system migration, modernization,   and in   production.   Mentorship and Leadership:  Conduct rigorous code reviews, mentor junior developers, and contribute to the continuous improvement of team standards and development processes.   Cross-Functional Collaboration:  Work in close partnership with product managers, business analysts, and other global teams to ensure technical solutions are perfectly aligned with evolving business requirements.     Qualifications   Required:   Experience:  8+ years of hands-on professional experience in designing and building robust, scalable, and maintainable server-side applications using Java.   Technical Depth:  Strong   expertise   in Object-Oriented Design, data structures, design patterns, and concurrency.   Database Skills:  5+ years of   significant experience   with SQL databases,   demonstrating   proficiency   in writing complex   queries   and   optimizing   database performance.   Operating Systems:  Strong command of the Unix/Linux environment, including familiarity with system-level operations and administration.   Education:   Bachelor’s degree in Computer Science , Engineering, or   a related   field.   Preferred (Highly Desirable):   Legacy Modernization:  Proven experience in migrating complex, large-scale legacy systems (particularly those heavily reliant on shell scripting and monolithic databases) to modern, cloud-native   microservices   architectures.   Modern Technologies:  Deep familiarity with modern Java frameworks (e.g., Spring Boot),   microservices   architecture, and containerization platforms (e.g., Docker, OpenShift).   AI-Assisted Development:  Experience using AI-powered development tools (e.g., GitHub Copilot, Claude, Devin) to accelerate development and improve code quality.   Database Systems:  Hands-on experience with enterprise-level SQL databases such as MSSQL.   Scripting:   Proficiency   in shell   scripting, which   will be essential for understanding and migrating the legacy system.   Domain Knowledge:  A solid understanding of the financial accounting domain, including concepts like posting, calculations, and sub-ledger processes.     Why Join Us?   Impact:  Take a leadership role in a high-visibility modernization project that will directly shape the future of Citi's global financial operations.   Challenge:  Solve unique and rewarding technical challenges while dismantling a legacy system and building a   cutting-edge   platform from the ground up.   Culture:  Be part of a world-class engineering team in a dynamic, collaborative, and supportive environment that encourages innovation and continuous learning.   Growth:  Access Citi’s extensive professional development resources and enjoy clear pathways for career advancement within a leading global financial institution.   ------------------------------------------------------ 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 . 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