Senior Java Backend Developer (Java / Spring Boot / …, Calgary

Overview Cogency Inc. is seeking a highly skilled Senior Java Backend Developer to build and maintain scalable, high-performance enterprise applications. The ideal candidate will have deep expertise in Java, Spring Boot, microservices architecture, and Kafka-based event-driven systems, with a strong focus on backend development, system design, performance optimization, and distributed systems integration. Key Responsibilities - Design, develop, and maintain robust backend services using Java and Spring Boot - Build and enhance RESTful APIs and microservices-based solutions - Develop and support event-driven architectures using Kafka - Participate in architecture discussions and contribute to design decisions - Implement resilience, fault tolerance, and scalability patterns - Optimize application performance, memory usage, and database interactions - Write clean, maintainable, and well-documented code - Perform unit, integration testing, and support QA/UAT cycles - Monitor, troubleshoot, and resolve production issues - Collaborate with DevOps, frontend teams, and business stakeholders Required Technical Skills 1. Core Java - Strong understanding of Object-Oriented Programming (OOP) - Expertise in Collections and Exception Handling - Hands-on experience with Java 8+ (Streams, Lambdas) - Knowledge of Design Patterns - Understanding of JVM internals and Garbage Collection - Robust knowledge of multithreading and concurrency - Spring Boot & Backend Frameworks - Dependency Injection (DI) and Inversion of Control (IoC) - REST API development and best practices - Configuration and setting management - JPA / Hibernate for persistence - Transaction management - Unit and integration testing (JUnit, Mockito) - Microservices Architecture - Service decomposition and domain-driven design (DDD) - Inter-service communication (REST, messaging) - Resilience patterns (Circuit Breaker, Retry, Bulkhead) - Observability (logging, monitoring, distributed tracing) - API gateway and service discovery - Kafka & Event Streaming - Kafka topics, producers, and consumers - Consumer groups and offset management - Kafka cluster architecture and replication - Message serialization (Avro / JSON) - Monitoring, troubleshooting, and performance tuning - Database & Performance - Strong SQL skills and query optimization - Experience with relational databases (Oracle, SQL Server, PostgreSQL) - Knowledge of indexing and performance tuning Qualifications - Bachelor’s degree in Computer Science, Engineering, or related field - 7+ years of hands-on backend development experience - Experience working in large-scale enterprise environments - Strong analytical, problem-solving, and debugging skills - Excellent communication and collaboration abilities Work Model Hybrid – 3 days per week onsite (mandatory) in downtown Calgary Apply on Kit Job: kitjob.ca/job/2pltei