Sammratt Saha

At Visa, I lead end-to-end QA strategy and release governance for high-volume payment processing and financial reporting platforms. I delivered 10 consecutive error-free monthly publication cycles, achieved 100% contractual quality compliance, and reduced undetected production defects by 65%.

I own ETL and data warehouse quality across Hadoop, Hive, PySpark, and Teradata pipelines, validating source-to-target mappings, transformations, reconciliations, historical reprocessing, and reporting cubes. I also built 200+ reusable Python and PySpark validation utilities, saving more than 20 engineering hours per release cycle.

I lead and mentor a 15+ engineer QA organization across India and global locations while partnering with Engineering, Product, and Operations on quality risks, release readiness, and production investigations.

I designed and shipped SENTINEL, a four-stage Claude-powered LLM pipeline that generates executable PySpark validation scripts at 90%+ AI-assisted output. I also defined test architecture for MCP servers and LLM agents, covering tool orchestration, grounding, guardrails, authorization, and prompt-injection resilience.