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BuzzClan

Senior Java Software Engineer

On site

Toronto, Canada

Senior

Freelance

23-12-2025

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Skills

Communication Java Visual Studio Eclipse SQL GitHub DevOps Jenkins Test Security Testing Networking Architecture PL/SQL Visual Studio Code

Job Specifications

Position Title: Senior Software Developer (10+ years)

Location: Toronto, ON

Mode: Contract

Position Overview

Client is seeking a highly experienced Senior Software Developer to support the design, development, modernization, and maintenance of large-scale enterprise applications. The successful candidate will work onsite and collaborate closely with business analysts, architects, testers, and stakeholders to deliver secure, reliable, and well-documented software solutions in alignment with OPS standards.

Key Responsibilities

Conduct requirements analysis in collaboration with business analysts and stakeholders
Design and document solution architectures, including conceptual, logical, and physical models
Participate in architecture checkpoints and solution design walkthroughs
Develop, integrate, and maintain system and solution components
Perform application modernization activities, including migration from WebSphere Application Server to Open Liberty/Liberty and upgrading Java applications from Java 8 to Java 9+
Patch WebSphere Application Server and troubleshoot compatibility and performance issues
Develop unit and integration test cases and support system, performance, and security testing
Prepare and maintain complete technical documentation and user guides
Support knowledge transfer activities and walkthroughs for technical team members
Collaborate effectively with internal teams, vendors, and service delivery partners
Manage multiple assignments concurrently while meeting project deadlines

Mandatory Qualifications and Experience

Minimum 10 years of demonstrated experience in IT systems development across multi-platform and multi-tier environments
Strong experience with enterprise Java technologies, including JSP, Servlets, JSF, JEE, EJB, JNDI, JDBC, JMS, XML, JSON, REST and SOAP-based web services
Proven experience migrating applications from WebSphere Application Server (WAS) to Open Liberty or Liberty
Demonstrated experience upgrading applications from Java 8 to Java 9 or higher
Experience patching and supporting WebSphere Application Server and resolving compatibility issues
Strong experience with application servers such as WebSphere, Tomcat, WebLogic, and Open Liberty
Experience with Oracle RDBMS (19c or higher) and PL/SQL
Experience with development and deployment tools, including GitHub, Jenkins, and DevOps practices
Knowledge of cloud technologies, containerization, hosting, deployment, and networking

Technical Skills and Competencies

Advanced knowledge of full-stack, multi-tier system design and integration
Strong experience with REST APIs, SOAP/WSDL services, JSON/XML messaging, and UI technologies
Proficiency with development and design tools such as Eclipse, IntelliJ, Visual Studio Code, MS Visio, and Power Designer
Strong debugging, refactoring, and performance optimization skills

Communication and Interpersonal Skills

Excellent written and verbal communication skills
Ability to prepare clear technical documentation and explain complex solutions to technical and non-technical audiences
Strong consulting, collaboration, and stakeholder engagement skills
Proven ability to work independently and as part of a team
Demonstrated ability to manage multiple priorities in a fast-paced environment

Public Sector Experience (Asset)

Familiarity with Ontario Public Service strategies, policies, standards, and guidelines
Understanding of OPS IT architecture standards, security, and privacy requirements
Previous experience supporting health sector or OPS projects is considered an asset

y guidelines, is considered an asset.

About the Company

Power Your Potential with BuzzClan Since 2013, BuzzClan has run on the vision to empower organizations to reach their full potential through cloud-driven infrastructure and technology solutions. As a leading IT managed services provider and certified partner for industry giants like Oracle, Amazon, Google, Microsoft, and Saviynt, we are reimagining what organizations can achieve. With headquarters in Dallas and offices across the US, Canada, India, and Kenya, our global reach allows us to serve the diverse needs of 100+ publ... Know more