Job Description Core

Factor is searching for an ETL Tester on a contract basis for a Financial Services client in the GTA .

This position is hybrid and will require the successful incumbent to go into the office four (4) days per week.

Roles and Responsibilities Collaborate with developers, business analysts, data engineers, and other stakeholders to identify, troubleshoot, and resolve data quality issues.

Participate in requirements reviews, source-to-target mapping sessions, and design discussions to ensure testability, completeness, and data quality.

Analyze source-to-target mappings, define test strategies, create comprehensive test cases, and perform rigorous data validation.

Validate data accuracy, completeness, and integrity through source-to-target reconciliation and transformation testing.

Execute complex SQL queries, perform backend testing, and validate ETL transformations across Oracle, SQL Server, and Big

Query platforms.

Validate end-to-end ETL workflows, data pipelines, and data movement across source, staging, and target environments.

Work with multiple source systems containing structured, semi-structured, and JSON data.

Develop and maintain automated data validation, reconciliation, and regression tests using Python, SQL, and other automation utilities.

Support continuous improvement of ETL testing processes through automation and reusable testing frameworks.

Own test planning, test execution, defect management, regression validation, test reporting, and testing sign-off for assigned EDW initiatives.

Collaborate with project teams to support release readiness activities and ensure delivery quality.

Maintain test cases, test results, defect logs, and other QA artifacts in Jira, Confluence, and related project repositories.

Requirements 5+ years of hands-on experience in ETL testing, data validation, source-to-target reconciliation, data transformation testing, and end-to-end validation of data pipelines in Data Warehouse environments.





Strong experience with SQL, backend testing, ETL validation, and complex Big

Query queries for data validation, reconciliation, and troubleshooting.

Strong understanding of Data Warehousing concepts, ETL processes, data modeling, and data quality principles.

Hands-on experience with Oracle, SQL Server, Big

Query, Informatica Power

Center, Airflow/Cloud Composer, and GCP data services.

Experience validating data across source, staging, and target systems, including structured, semi-structured, and JSON data.

Experience developing and maintaining ETL test automation solutions using Python, SQL, or similar technologies for automated data validation, reconciliation, and regression testing.

Proven ability to own test planning, test execution, regression validation, defect management, and testing sign-off activities for EDW initiatives.

Requirements Do you have the skills that will enable you to succeed in this role? You have 10 or more years of software development experience, (conceptualization, design, development and debugging) with at least two years of experience as a technical lead providing hands-on architectural design for software applications with an understanding of design patterns such as MVVM, MVC, Clean Architecture Sound technical knowledge with: Java, J2EE Web Services (REST & SOAP) Angular 8(+) Java Script Spring Boot (Micro Services) You have experience with unit-testing, code for robustness, security, usability and improving performance of the overall application You have a proficient understanding of code versioning tools, such as Git Strong command in Computer Science concepts (SOLID, etc.) Experience in integrating Third Party libraries and SDKs Experience building applications that consume web services and REST interaction with JSON Solid problem solving abilities Evaluate new technologies and participate in the continuous improvement of applications and systems Youre passionate about well-designed products and not afraid to sit with our Design Team to prototype, wireframe, and white-board your ideas

📌 ETL Tester (Contract) (Toronto)
🏢 CoreFactor
📍 Toronto