Senior Data Migration Tester – Mortgage Systems Lead

Gazelle Global; Amsterdam; On-site; EUR 65,000 - 90,000; Full time

Job summary

Gazelle Global is seeking a Senior Tester for a 2–3 year data migration project with a large financial client in Amstelveen. The role focuses on leading data migration testing across the lifecycle, coordinating complex scenarios and ensuring data integrity during migration.

The ideal candidate has proven experience in enterprise testing, strong SQL skills, and fluency in Dutch and English, with the ability to work across legacy and modern systems.

Qualifications

• Senior tester with proven experience in complex enterprise environments.
• Fluent in Dutch and English (spoken and written).
• Strong testing across legacy and modern system landscapes.
• Hands-on SQL and relational databases.

Responsibilities

• Lead the planning, design, execution, and reporting of data migration testing activities.
• Coordinate complex migration test scenarios including validation of calculations, business rules, document migration, and recovery testing.
• Analyze migration outcomes to validate data quality, completeness and accuracy.
• Identify and support defect resolution during migration testing.
• Collaborate with data engineers, IT Business Analysts, project managers, and cross-functional teams to deliver outcomes.
• Document test execution, findings, risks, deviations, and recommendations for auditable migration processes.
• Help continuously improve testing processes to align with governance and quality standards.

Job description

Gazelle Global is seeking a Senior Tester for a 2–3 year data migration project with a large financial client in Amstelveen. The role focuses on leading data migration testing across the lifecycle, coordinating complex scenarios and ensuring data integrity during migration.

The ideal candidate has proven experience in enterprise testing, strong SQL skills, and fluency in Dutch and English, with the ability to work across legacy and modern systems.