Software Developer - Senior - MSON #2

Job Title: Software Developer – Senior
Location: Toronto, ON
Experience: 3–9 Years
Job Type: Contract

We are seeking an experienced Senior Software Developer to design, develop, integrate, and maintain complex software applications and data-driven solutions. The candidate will be responsible for implementing application features, developing APIs, building ETL pipelines, integrating front-end and back-end components, and optimizing database performance. The ideal candidate will demonstrate strong programming skills, sound architectural understanding, and the ability to deliver scalable, secure, and maintainable applications.

• Design, develop, enhance, and maintain enterprise and internet-ready applications.

• Develop, consume, test, and integrate RESTful APIs and other application interfaces.

• Implement front-end components and integrate them with back-end services, business logic, and databases.

• Design, build, and maintain ETL workflows and data pipelines to support data extraction, transformation, validation, and loading.

• Develop application modules using object-oriented programming principles and relevant 3GL languages.

• Write complex SQL queries, optimize database operations, and troubleshoot data-related issues.

• Design and maintain relational database structures and support applications that interact with hierarchical databases.

• Apply rapid application development (RAD) approaches to accelerate prototyping, iterative delivery, and application enhancements.

• Identify and resolve performance bottlenecks across application, API, integration, and database layers.

• Implement application validation, error handling, logging, security controls, and data integrity measures.

• Conduct code reviews, unit testing, integration testing, and defect resolution.

• Collaborate with business analysts, architects, QA engineers, DevOps teams, and other stakeholders to translate requirements into technical solutions.

• Prepare technical specifications, integration documentation, and implementation guidelines.

• Mentor junior developers and contribute to coding standards and development best practices.

• 3–9 years of professional software development experience.

• Strong experience in application development, programming, and software integration.

• Hands-on experience designing and integrating APIs and web services.

• Proficiency in front-end development and front-end/back-end integration.

• Experience developing and maintaining ETL processes or data pipelines.

• Strong knowledge of object-oriented programming and one or more 3GL languages, such as Java, C#, C++, or Python.

• Proficiency in SQL and experience working with relational databases; exposure to hierarchical databases is desirable.

• Experience developing and supporting internet-ready, data-driven applications.

• Knowledge of RAD methodologies, iterative development, and agile practices.

• Ability to troubleshoot complex application issues and optimize code and database performance.

• Familiarity with source control, automated testing, deployment practices, and technical documentation.

• Strong analytical, communication, and cross-functional collaboration skills.

• Experience with API security, authentication, and integration patterns.

• Exposure to cloud-based application development, CI/CD, and application monitoring.

• Experience with ETL orchestration tools, data validation frameworks, or enterprise integration platforms.