Global Financial Firm located in MISSISSAUGA, ON has an immediate contract chance for an experienced Senior Java Developer Pay Rate: $70.00 - $75.00 Negotiable based upon years of experience Work Mode: Hybrid Location: Mississauga, ON Responsibilities: Analyze complex business requirements and translate them into highly scalable, reliable, and secure backend systems designs.

Write high-quality, production-ready, and performant Java code using advanced software engineering principles.

Lead the technical implementation and delivery of critical, complex backend and data-processing initiatives.

Act as the resident Subject Matter Expert (SME) in high-throughput data processing and JVM performance tuning.

Diagnose, profile, and resolve complex performance bottlenecks, memory leaks, and concurrency issues in high-volume distributed environments.

Champion code quality through Test-Driven Development (TDD), comprehensive unit/integration testing, and rigid code review standards.

Provide technical mentorship and architectural guidance to other engineers on the team.

Requirements: Minimum 8 years of professional experience in application development or systems analysis, with a heavy emphasis on Java-based backend architectures.

Deep, expert-level understanding of Core Java (Java 11/17/21), including advanced multithreading,



concurrency models, Java memory model, and Collections API.

Extensive hands-on experience building distributed data processing systems, ETL pipelines, and real-time streaming architectures using tools like Apache Kafka, Apache Spark, Flink, or Hadoop.

Strong experience with the Spring Ecosystem (Spring Boot, Spring Cloud, Spring Data, Spring Security) and ORM frameworks (Hibernate/JPA).

Proficiency in designing schemas and writing optimized queries for both relational databases and NoSQL stores.

Comprehensive understanding of distributed system design patterns, consensus protocols, caching strategies, and API design.

Practical experience with containerization, continuous integration/continuous deployment tools, and infrastructure-as-code principles.

Strong advocate for testing frameworks such as JUnit, Mockito, and integration testing tools.

Preferred Skills: Experience with cloud platforms (AWS, Azure, or GCP), specifically managed database and container services.

Experience in financial services, banking technology, or large-scale enterprise transaction systems.

Familiarity with Unix/Linux environments, shell scripting, and network configurations.

This role is for an existing vacancy.

📌 Senior Java Developer (Mississauga)
🏢 Axelon Services
📍 Mississauga