Senior Java Developer in Mississauga, Ontario II Fulltime

Java Developer in Mississauga, Ontario (Hybrid)

Opening- 10

Salary CAD 120K

Hands on coding in Java

Job Title : Senior Java Developer

Location : Mississauga, Ontario, Canada

Company : Citibank

Employment Type : Full-Time

About the Role

We are seeking a highly skilled and experienced Senior Java Developer to join our technology team in Mississauga. The ideal candidate will play a key role in designing, developing, and maintaining high-performance, scalable, and secure enterprise banking applications. This position requires strong hands-on coding expertise, system design experience, and a deep understanding of financial services technology environments.

Key Responsibilities

Design, develop, and maintain enterprise-grade applications using Java 8 / 11 / 17

Develop microservices-based applications using Spring Boot & Spring Framework

Build and integrate RESTful APIs and event-driven services

Participate in system architecture and technical design discussions

Ensure high performance, scalability, and security of applications

Collaborate with cross-functional teams including QA, DevOps, Product, and Business stakeholders

Perform code reviews, unit testing, and enforce best coding practices

Troubleshoot and resolve production issues in high-availability systems

Contribute to CI / CD pipelines and DevOps practices

Required Qualifications

8+ years of hands-on experience in Java development

Strong expertise in :

Core Java (Collections, Multithreading, Concurrency, JVM tuning)

Spring Boot, Spring MVC, Spring Security

RESTful API development

Microservices architecture

Experience with :

SQL & NoSQL databases (Oracle, PostgreSQL, MongoDB)

Messaging systems (Kafka, RabbitMQ)

Docker & Kubernetes

Git, Maven / Gradle

Experience working in Agile / Scrum environments

Strong understanding of design patterns and system design principles

Experience in banking or financial services domain preferred

Nice to Have

Experience with cloud platforms (AWS / Azure / GCP)

Knowledge of CI / CD tools (Jenkins, GitHub Actions)

Exposure to event-driven architecture

Experience with performance tuning and distributed systems

Familiarity with regulatory and compliance-driven environments