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.
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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
- 8+ years of hands-on professional experience in Java
- 5+ years of significant experience with SQL databases
- Strong command of the Unix/Linux environment
- Bachelor's degree in Computer Science, Engineering, or related field
- Experience in migrating large-scale legacy systems to cloud-native microservices
- Familiarity with modern Java frameworks and containerization platforms
- Experience using AI-powered development tools
- Hands-on experience with enterprise-level SQL databases
- Proficiency in shell scripting
- Understanding of financial accounting domain concepts
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
What We Do
Citi's mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. Our core activities are safeguarding assets, lending money, making payments and accessing the capital markets on behalf of our clients. We have 200 years of experience helping our clients meet the world's toughest challenges and embrace its greatest opportunities. We are Citi, the global bank – an institution connecting millions of people across hundreds of countries and cities.
