Software Developer - Senior - MSON 2

Job Title: Software Developer – Senior Location: Toronto, ON Experience: 3–9 Years Job Type: Contract Job Summary 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. Key Responsibilities • 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. Required Skills and Qualifications • 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. Preferred Qualifications • 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.