Job Title: Java Backend Developer

Location: Toronto Downtown, ON / Hybrid – 4 Days/Week Work From Office

Contract: 12+ Months Responsibilities Design scalable event driven backend services using Kafka and Core Java to support high volume transaction processing in a secure and efficient manner

Develop robust Spring Boot microservices that enable reusable payment and card processing capabilities aligned with enterprise architecture standards

Implement reliable Kafka producers and consumers that ensure exactly once or appropriate delivery semantics for critical financial events

Optimize application performance by profiling Java code tuning threads and memory and improving response times for latency sensitive operations

Create modular and testable service components that promote clean separation of concerns and ease of maintenance across the codebase

Collaborate with product owners and business partners to translate complex cards and payments requirements into clear technical solutions

Integrate services with upstream and downstream systems using secure APIs and messaging while maintaining data consistency and observability

Apply secure coding practices and relevant compliance guidelines to protect customer information and transaction data throughout the solution lifecycle

Develop automated unit and integration tests that increase coverage and ensure regression free deployments for critical payment workflows





Troubleshoot production incidents by analyzing logs metrics and traces and implement durable fixes that improve platform stability and customer trust

Contribute to code reviews by providing constructive feedback that improves code quality maintainability and alignment to engineering standards

Document technical designs service contracts and operational runbooks that support smooth onboarding support activities and future enhancements

Mentor peers through knowledge sharing sessions on Kafka patterns Spring Boot best practices and resilient design techniques that uplift team capability Qualifications Possess robust hands on expertise in Core Java including collections concurrency and functional constructs used to build enterprise grade services

Demonstrate advanced proficiency in Spring Boot including dependency injection data access configuration management and production ready features

Exhibit practical experience designing and operating Kafka based solutions with topics partitions consumer groups and message serialization patterns

Bring experience in developing secure and scalable APIs that integrate with internal systems or partner platforms in a financial services context

Show familiarity with cards and payments domain concepts such as authorization clearing settlement and dispute handling as a desirable advantage

Apply solid understanding of software engineering practices including version control continuous integration code review and automated testing

Display experience working in hybrid work environments with distributed teams using collaboration tools and clear communication to ensure alignment

📌 Java Backend Developer (Toronto)
🏢 Atlantis IT Group
📍 Toronto