Senior Java Developer (Core Java)

Position: Senior Java Developer

Location: Onsite- Mississauga, ON

Job type: Full-time/Permanent hiring

We are seeking a highly experienced Senior Java Developer to drive the architectural design, development, and scaling of our enterprise-grade microservices and distributed systems. In this critical backend role, you will be responsible for building high-performance, resilient application ecosystems that securely process complex business logic and integrate seamless RESTful APIs across the enterprise.

You will act as a core technical anchor, collaborating deeply with architects, business analysts, and cross-functional engineering teams to translate complex requirements into robust, production-ready software.

Core Responsibilities

• Microservices Development: Architect, build, and maintain scalable, high-throughput microservices leveraging Java, Spring Boot, and cloud-native design patterns.
• API & System Integration: Design, implement, and consume secure, highly performant RESTful APIs to integrate internal platforms with external enterprise systems.
• Data & Messaging Orchestration: Optimize application interactions with relational databases and event-driven architectures utilizing distributed messaging systems.
• Code Quality & Reliability: Lead by example through robust unit testing, system integration testing, strict code reviews, and proactive application performance tuning.
• CI/CD & DevOps Alignment: Implement and support continuous integration and deployment pipelines to ensure rapid, secure production releases.

Required Technical Skills

• Experience: 6–10 years of progressive, hands-on enterprise software engineering experience.
• Core Java Mastery: Elite proficiency in Core Java, including modern language features (Java 8, 11, and 17).
• Spring Ecosystem Expertise: Deep, production-grade knowledge of Spring Boot, Spring MVC, Spring Security, and Spring Data JPA.
• Distributed Architecture: Proven experience designing and operating Microservices Architectures and handling distributed transactions.
• Databases & Messaging: Strong command of SQL databases (PostgreSQL, Oracle, or SQL Server) alongside event streaming/messaging tools (Kafka, RabbitMQ, or JMS).
• Foundational Engineering: Complete fluency in Git-based workflows, Unix/Linux environments, and Object-Oriented Design Patterns.