Lead Application Support Engineer — Java & AI

Citigroup Inc.; Mississauga; On-site; CAD 168,000 - 238,000; Full time

Job summary

Citigroup Inc. in Mississauga is seeking an experienced Application Support Analyst – Senior to combine strong Java development with hands-on application support and an interest in AI innovations.

You will contribute to high-value projects on a global platform, ensuring stability, scalability, and continuous improvement in support operations. The role emphasizes core Java, Spring Boot, RESTful APIs, microservices, and enterprise application support across capital markets.

Qualifications

• 2+ years of hands-on Java development including Core Java, OOP
• Spring Boot framework and RESTful API design and implementation
• 6+ years in application support roles
• Experience with Oracle, MS SQL, MongoDB
• Angular 2+ and UI/UX design awareness
• Capital Markets domain experience preferred

Responsibilities

• Provide technical and business support for Citi Applications, resolving issues quickly and improving stability
• Write and maintain high-quality Java code using Spring Boot, RESTful APIs, and microservices
• Liaise between users/traders, internal tech groups and vendors; coach junior analysts
• Participate in end-to-end application releases from development to production
• Perform post-release checkouts and infrastructure updates
• Develop and maintain technical support documentation

Skills

Java Development

Spring Boot

RESTful APIs

Microservices

Application Support

Oracle

MS SQL

MongoDB

Angular 2+

UI/UX

AI Interest

AI Tools

Generative AI

AI-driven Monitoring

Capital Markets

Communication

Problem-Solving

Adaptability

Continuous Learning

Education

Bachelor's/University degree or equivalent experience

Tools

Oracle

MS SQL

MongoDB

Job description

Citigroup Inc. in Mississauga is seeking an experienced Application Support Analyst – Senior to combine strong Java development with hands-on application support and an interest in AI innovations.

You will contribute to high-value projects on a global platform, ensuring stability, scalability, and continuous improvement in support operations. The role emphasizes core Java, Spring Boot, RESTful APIs, microservices, and enterprise application support across capital markets.