Java Developer

Toronto, ON
On-site
Posted Oct 22, 2026
1 position

Opens LinkedIn

Employment type: Full-time
Experience level: Senior · 5+ years
Posting language: English
Working hours: 40 hours per week
Seniority: Mid-Senior level
Application method: Direct apply is available

Job summary

Design, develop, and maintain scalable Java microservices and reactive applications, including REST APIs and event-driven integrations using IBM MQ and Kafka. Collaborate with cross-functional teams, uphold code quality through documentation and reviews, troubleshoot production issues, and contribute to optimization and automation.

Job details

Position: Java Developer Location: Toronto, ON Job Description We are looking for a Java Developer with strong experience in Java 17, Spring Boot, Spring WebFlux, microservices, REST APIs, IBM MQ, and Apache Kafka. The role involves developing high-performance, scalable applications and collaborating with cross-functional teams to deliver end-to-end solutions. Responsibilities Design, develop, and maintain high-performance, scalable microservices using Java 17 and Spring Boot. Build reactive and non-blocking applications using Spring WebFlux to handle high-concurrency workloads efficiently. Develop and consume RESTful APIs following industry best practices and ensuring proper documentation. Implement event-driven architecture using IBM MQ and Apache Kafka for asynchronous communication between services. Collaborate with cross-functional teams including frontend developers, architects, and product owners to deliver end-to-end solutions. Write clean, maintainable, and well-documented code adhering to coding standards and best practices. Participate in code reviews, provide constructive feedback, and ensure code quality across the team. Troubleshoot production issues, perform root cause analysis, and implement effective fixes. Contribute to continuous improvement initiatives by identifying opportunities for optimization and automation. Mandatory Skills Java 17 – Expert-level understanding of Java 17 features including records, sealed classes, pattern matching, and enhanced switch expressions. Spring Boot – Strong hands-on experience building production-grade applications using Spring Boot. Spring WebFlux – Proficiency in developing reactive, non-blocking applications using Spring WebFlux and Project Reactor. REST APIs – Expertise in designing, developing, and securing RESTful APIs with proper versioning and error handling. Microservices – Solid experience with microservices architecture including service discovery, API gateway, circuit breakers, and distributed tracing. IBM MQ – Hands-on experience with IBM MQ for enterprise messaging and integration. Apache Kafka – Strong knowledge of Kafka for building event-driven systems, including producers, consumers, and stream processing. Good to Have MongoDB – Experience with MongoDB for NoSQL database design, queries, and aggregation pipelines. AWS Cloud – Familiarity with AWS services such as EC2, S3, Lambda, ECS, and RDS. OpenShift – Experience deploying and managing applications on OpenShift or similar container platforms. Kubernetes – Knowledge of Kubernetes for container orchestration, deployments, and scaling. Helm – Experience with Helm charts for Kubernetes application packaging and deployment. Harness – Familiarity with Harness for continuous delivery and deployment automation. Git & Bitbucket – Proficiency in version control using Git and collaboration via Bitbucket. JIRA – Experience using JIRA for agile project management and issue tracking. Gradle – Hands-on experience with Gradle for build automation and dependency management. Lightspeed – Familiarity with Lightspeed for development acceleration. Kibana – Experience with Kibana for log visualization, monitoring, and troubleshooting.

What you’ll do

Requirements

Requires expert-level Java 17 knowledge and strong hands-on experience with Spring Boot, Spring WebFlux, REST APIs, and microservices architecture. Also requires experience with IBM MQ and Apache Kafka; MongoDB, AWS, container platforms, deployment tools, and related development tools are listed as good to have.