Java backend Developer

Job Title: Java Backend Developer Location: Toronto Downtown, ON / Hybrid – 4 Days/Week Work From Office Contract: 12+ Months Job Description: We are looking for an experienced Java Backend Developer to design, develop, and maintain scalable, high-performance backend applications. The ideal candidate should have strong expertise in Java-based application development, cloud-native architectures, distributed systems, and exposure to Generative AI technologies. Responsibilities Design scalable event driven backend services using Kafka and Core Java to support high volume transaction processing in a secure and efficient mannerDevelop robust Spring Boot microservices that enable reusable payment and card processing capabilities aligned with enterprise architecture standardsImplement reliable Kafka producers and consumers that ensure exactly once or appropriate delivery semantics for critical financial eventsOptimize application performance by profiling Java code tuning threads and memory and improving response times for latency sensitive operationsCreate modular and testable service components that promote clean separation of concerns and ease of maintenance across the codebaseCollaborate with product owners and business partners to translate complex cards and payments requirements into clear technical solutionsIntegrate services with upstream and downstream systems using secure APIs and messaging while maintaining data consistency and observabilityApply secure coding practices and relevant compliance guidelines to protect customer information and transaction data throughout the solution lifecycleDevelop automated unit and integration tests that increase coverage and ensure regression free deployments for critical payment workflowsTroubleshoot production incidents by analyzing logs metrics and traces and implement durable fixes that improve platform stability and customer trustContribute to code reviews by providing constructive feedback that improves code quality maintainability and alignment to engineering standardsDocument technical designs service contracts and operational runbooks that support smooth onboarding support activities and future enhancementsMentor peers through knowledge sharing sessions on Kafka patterns Spring Boot best practices and resilient design techniques that uplift team capability Qualifications Possess strong hands on expertise in Core Java including collections concurrency and functional constructs used to build enterprise grade servicesDemonstrate advanced proficiency in Spring Boot including dependency injection data access configuration management and production ready featuresExhibit practical experience designing and operating Kafka based solutions with topics partitions consumer groups and message serialization patternsBring experience in developing secure and scalable APIs that integrate with internal systems or partner platforms in a financial services contextShow familiarity with cards and payments domain concepts such as authorization clearing settlement and dispute handling as a desirable advantageApply solid understanding of software engineering practices including version control continuous integration code review and automated testingDisplay experience working in hybrid work environments with distributed teams using collaboration tools and clear communication to ensure alignment