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Role Summary We are seeking a highly skilled and experienced Backend Java Developer to join our dynamic engineering team. The ideal candidate will be responsible for designing, developing, and maintaining scalable, high-performance, and resilient backend services. This role involves working with a modern technology stack focused on asynchronous, event-based microservices, reactive programming, and robust data persistence solutions. A strong commitment to quality through Test‑Driven Development (TDD) and comprehensive unit testing is essential.

Responsibilities

Design, develop, and deploy asynchronous, event‑driven microservices using Java.

Implement solutions leveraging Java Lambdas and Reactive Functional Programming paradigms.

Work with NoSQL databases, specifically MongoDB, for efficient data storage and retrieval.

Utilize Elasticsearch for building powerful search and analytics capabilities.

Integrate and develop event streaming solutions with Apache Kafka.

Ensure high code quality through adherence to Test‑Driven Development (TDD) principles and writing thorough JUnit tests.

Collaborate with frontend developers, product managers, and other stakeholders to define and deliver features.

Participate in code reviews to maintain code quality, share knowledge, and ensure best practices.

Troubleshoot and debug production issues, providing timely resolutions.

Contribute to the continuous improvement of our development processes, tools, and methodologies.

Stay up-to-date with emerging trends and technologies in backend development.

Required Skills And Experience Core Technologies

Languages & Frameworks:

Strong proficiency in Java (Java 8+), with extensive experience in building scalable backend applications.

Microservices:

Experience with designing and implementing asynchronous, event‑based microservices architectures.

Functional & Reactive Programming:





Hands‑on experience with Java Lambdas and Reactive Programming frameworks (e.g., Spring WebFlux, Reactor, RxJava).

Databases:

NoSQL:

Strong experience with MongoDB.

Search & Analytics:

Proficiency with Elasticsearch.

Messaging & Streaming:

Solid experience with Apache Kafka for event streaming and messaging.

Development Practices

Testing:

Expert-level understanding and practical application of JUnit for unit testing and Test‑Driven Development (TDD).

Version Control:

Proficient with Git and collaborative development workflows (e.g., Pull Requests, GitFlow).

CI/CD:

Familiarity with continuous integration and continuous deployment pipelines.

General

Strong understanding of data structures, algorithms, and object‑oriented design principles.

Experience with RESTful API design and development.

Familiarity with cloud platforms (e.g., AWS, Azure, GCP) is a plus.

Excellent problem‑solving, analytical, and debugging skills.

Ability to work independently and as part of a collaborative team.

Strong communication skills, both written and verbal.

Preferred Qualifications

Bachelor's or Master's degree in Computer Science, Engineering, or a related field.

Experience with Docker and Kubernetes for containerization and orchestration.

Knowledge of other NoSQL databases.

Contributions to open‑source projects.

Experience in a fast‑paced, agile development environment.

Citi is an equal prospect 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.

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Apply on Kit Job: kitjob.ca/job/2g9eyy

📌 Backend Java Developer (Mississauga)
🏢 Citi
📍 Mississauga