Senior Java Backend Developer (Java / Spring Boot / Microservices / Kafka) - 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
2. Spring Boot & Backend Frameworks
   • Dependency Injection (DI) and Inversion of Control (IoC)
   • REST API development and best practices
   • Configuration and environment management
   • JPA / Hibernate for persistence
   • Transaction management
   • Unit and integration testing (JUnit, Mockito)
3. 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
4. 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
5. 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

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