The Senior Lead Engineer - QA role involves collaborating with development teams to finalize Non-Functional Requirements (NFRs) and define performance acceptance criteria. Responsibilities include providing time and effort estimates for performance testing, building comprehensive test plans, and designing/executing strategies using NeoLoad or similar tools. The role requires integrating performance testing into CI/CD pipelines using GitLab, monitoring application performance with APM tools like New Relic, and utilizing SQL for backend analysis. The engineer will also build visualizations and dashboards for performance metrics, provide detailed reports with root cause analysis, and embed performance best practices with cross-functional teams.