Overview of the Company: Citi, the leading global bank, has approximately 200 million customer accounts and does business in more than 160 countries and jurisdictions. Citi provides consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management.As a bank with a brain and a soul, Citi creates economic value that is systemically responsible and in our clients’ best interests. As a financial institution that touches every region of the world and every sector that shapes your daily life, our Enterprise Operations &amp; Technology teams are charged with a mission that rivals any large tech company. Our technology solutions are the foundations of everything we do from keeping the bank safe, managing global resources, and providing the technical tools our workers need to be successful to designing our digital architecture and ensuring our platforms provide a first-class customer experience. We reimagine client and partner experiences to deliver excellence through secure, reliable, and efficient services.Our commitment to diversity includes a workforce that represents the clients we serve from all walks of life, backgrounds, and origins. We foster an environment where the best people want to work. We value and demand respect for others, promote individuals based on merit, and ensure opportunities for personal development are widely available to all. Ideal candidates are innovators with well-rounded backgrounds who bring their authentic selves to work and complement our culture of delivering results with pride. If you are a problem solver who seeks passion in your work, come join us. We’ll enable growth and progress together.Overview of Chief Information Security Office (CISO):The Chief Information Security Office (CISO) is home to deeply talented colleagues that work to ensure the safety of Citis clients, our revenue, our employees and our proprietary data. We manage information security as one end-to end program – one with a clear mandate and accountability. Our mission is a program that is fully anchored to modern control and architectural frameworks, is fully aligned with the enterprise architecture of the firm and is deeply integrated into the sectors and functions.Overview of the Role:We are seeking a highly skilled and motivated Lead Full Stack Application Development Engineer to join our Cloud Technology team. In this role, you will be instrumental in developing advanced Artificial Intelligence (AI) systems, with a specific focus on Large Language Models (LLMs), Agentic frameworks, and Retrieval-Augmented Generation (RAG). The ideal candidate will possess strong programming skills, a solid understanding of database systems, and the ability to design, develop, and maintain efficient, scalable, and robust applications. Responsibilities:<ul><li>Develop foundational components and advance technological capabilities within AI and LLM domains.</li><li>Build robust, scalable, and user-friendly solutions, embracing agile methodologies with rapid iteration and adaptability.</li><li>Partner closely with internal development teams and subject matter experts across the business to deliver integrated solutions.</li><li>Ensure all software platforms adhere to Citis security standards and Software Development Life Cycle (SDLC) processes.</li><li>Manage and innovate the platform at scale, ensuring continuous evolution and high performance.</li></ul> Qualifications:<ul><li>6+ years of relevant experience in Application Development, including designing and developing web portals and intranet/internet applications.</li><li>Strong proficiency in Programming Languages, with a preference for Python (asynchronous programming), FastAPI, and Javascript/Typescript.</li><li>Hands-on experience implementing web applications using Angular, JavaScript, Bootstrap, HTML5, JSON, CSS, and AJAX.</li><li>Solid understanding of the following AI/ML:<ul><li>Language Models such as GPT, Gemini, Claude,</li><li>Transformers, including concepts like Attention Mechanisms and Encoder-Decoders Architectures.</li><li>Agentic Frameworks, to build intelligent agents that operate autonomously, coordinate tasks and integrate with tools and platforms.</li><li>RAG (Retrieval-Augmented Generation), to optimize the output of a large language module so it references an authoritative knowledge base outside of its training data sources before generating a response.</li></ul></li><li>Proven experience in the following SDLC (Software Development Life Cycle) Activities: <ul><li>Systems Analysis: Gathering requirements, defining system specifications, and creating use cases for complex enterprise applications.</li><li>Design: Architecting scalable solutions, creating database schemas, and designing API contracts.</li><li>Coding: Writing clean, efficient, and well-documented code in Python, JavaScript, etc.</li><li>Unit Testing: Developing and executing unit tests using frameworks like Pytest or Jest to ensure code quality.</li><li>Other SDLC Activities: Integration Testing, Performance Testing, and Deployment Planning.</li></ul></li><li>Experience with Code Reviews, Continuous Integration, and ensuring code quality through Test Case Reviews.</li><li>Experience with CI/CD pipelines and Source Code Management (SCM) tools like GIT, along with issue tracking tools like JIRA.</li><li>Demonstrated experience building and running large-scale platforms.</li><li>Solid understanding and experience with RESTful API design principles, including Designing Stateless APIs, using appropriate HTTP methods (GET, POST, PUT, DELETE), and Implementing Versioning and Authentication (e.g., OAuth2, JWT).</li><li>Experience with Container technologies (e.g., Docker) and Kubernetes for orchestration, deployment, and scaling of containerized applications.</li><li>Proficient in Agile/Scrum methodologies, including participation in Daily Stand-ups, Sprint Planning, Backlog Refinement, and Sprint Reviews.</li><li>Development experience with at least one major Public Cloud provider (e.g., AWS, Azure, GCP).</li><li>Ability to adjust priorities quickly and effectively as circumstances dictate.</li><li>Demonstrated leadership and project management skills.</li><li>Consistently demonstrates clear, concise, written, and verbal communication skills.</li></ul> Preferred Qualification:<ul><li>Experience with MongoDB or other NoSQL databases (e.g., Cassandra, DynamoDB, Redis) for handling large volumes of unstructured or semi-structured data, including designing schemas, querying, and optimizing performance.</li></ul>Education:Bachelor’s degree/University degree or equivalent experienceMaster’s degreeThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.------------------------------------------------------Job Family Group: Technology------------------------------------------------------Job Family:Systems &amp; Engineering------------------------------------------------------Time Type:Full time------------------------------------------------------Primary Location:Irving Texas United States------------------------------------------------------Primary Location Full Time Salary Range:$125,760.00 - $188,640.00 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 &amp; 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:Oct 27, 2025------------------------------------------------------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 <a href="https://www.citigroup.com/citi/accessibility/application-accessibility.htm" target="_blank">Accessibility at Citi</a>. View Citi’s <a href="https://www.citigroup.com/global/eeo-aa-policy" target="_blank">EEO Policy Statement</a> and the <a href="https://www.eeoc.gov/sites/default/files/2023-06/22-088_EEOC_KnowYourRights6.12ScreenRdr.pdf" target="_blank">Know Your Rights</a> poster.