Sr Backend Java Developer

Grow your career as a Senior Backend Java Developer with an innovative global bank in Mississauga, ON. Contract role with strong possibility of extension. Will require working a hybrid schedule 3 days onsite per week. Join one of the world's most renowned global banks and trusted brand with over 200 years of continuously evolving financial services worldwide. You will work alongside some of the smartest minds in the industry who are excited to share their knowledge and to learn from you. Contract Duration: 6 Months Required Skills & Experience 8+ years of 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 (JVM garbage collection, heap analysis), 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 (e.g., PostgreSQL, MySQL, Oracle) and NoSQL stores (e.g., Cassandra, MongoDB, Redis). Comprehensive understanding of distributed system design patterns, consensus protocols, caching strategies, and API design (RESTful APIs, gRPC). Practical experience with containerization (Docker, Kubernetes), continuous integration/continuous deployment tools (Jenkins, GitLab CI, or GitHub Actions), and infrastructure-as-code principles. Strong advocate for testing frameworks such as JUnit, Mockito, and integration testing tools. ??????? Desired Skills & Experience 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. ??????? What You Will Be Doing Hands-on Java Development Systems Analysis & Architecture: Analyze complex business requirements and translate them into highly scalable, reliable, and secure backend systems designs. Evaluate trade-offs between different data architecture patterns (e.g., microservices vs. event-driven). Hands-on Programming: Write high-quality, production-ready, and performant Java code. Leverage advanced software engineering principles such as Object-Oriented Programming (OOP), SOLID design principles, and design patterns. Technical Project Delivery: Lead the technical implementation and delivery of critical, complex backend and data-processing initiatives. Partner with cross-functional teams to ensure successful project deployment from conception through production. Subject Matter Expertise (SME): Act as the resident Subject Matter Expert (SME) in high-throughput data processing, stream processing, or JVM performance tuning. Provide guidance on industry best practices and emerging backend technologies. Performance Optimization: Diagnose, profile, and resolve complex performance bottlenecks, memory leaks, and concurrency issues in high-volume distributed environments. Quality Assurance & Best Practices: Champion code quality through Test-Driven Development (TDD), comprehensive unit/integration testing, and rigid code review standards. Mentorship: Provide technical mentorship and architectural guidance to other engineers on the team, fostering a culture of technical excellence and clean code. Posted By: Melissa Klein

The candidate will design and develop scalable, high-throughput backend systems and data processing pipelines using Java. They will also provide technical leadership, perform JVM performance tuning, and mentor other engineers to ensure code quality.

Requires over 8 years of experience in Java-based backend architecture with expert knowledge of Core Java, Spring Ecosystem, and distributed data processing tools. Proficiency in both relational and NoSQL databases, as well as containerization and CI/CD tools, is essential.

• KubernetesPreferred
• PostgreSQLPreferred
• DockerPreferred
• JavaPreferred
• Spring BootPreferred

Identified from the job description. Confirm important requirements above.

• Java
• Spring Boot
• Apache Kafka
• Apache Spark
• Distributed Systems
• Microservices
• Kubernetes
• Docker
• PostgreSQL
• NoSQL
• Hibernate
• JUnit
• JVM Tuning
• RESTful APIs
• gRPC
• ETL Pipelines

• Software
• Technology
• Engineering
• Finance & Accounting
• Data & Analytics

Minimum experience

10+ years

Apply by

Sep 4, 2026

Posting language

English

Working hours

40 hours per week

Office presence

3 days per week

Seniority

Mid-Senior level