Product Quality & Manufacturing Data

I investigate manufacturing quality problems — and turn failure signals into data-driven corrective actions.

Corey Zhou · Manufacturing Quality Data Engineer

Failure analysis · yield movement review · false-fail separation · Python / SQL automation · quality workflow systems

I combine semiconductor product evaluation experience with Python, SQL, statistical analysis, and internal tooling to detect abnormal quality signals, analyze failure patterns, and support corrective-action follow-through in high-volume manufacturing environments.

M.2 SSD DAS FET Burnout Root Cause Analysis

Traced intermittent DAS FET burnout in M.2 SSD LI testing to conductive debris, PCB/socket alignment risk, and DAS screening limitations, then helped reduce collected/confirmed burnout from 11 ppm to 2 ppm.

Demonstrates: root-cause chain analysis, screening logic improvement, statistically validated defect reduction

M.2 SSD LIDAS FET burnout11 ppm to 2 ppm

Manufacturing Quality Anomaly Detection Dashboard

Synthetic dashboard for yield movement, defect-code concentration, equipment-level failure patterns, false-fail signals, anomaly ranking, and corrective-action validation.

Demonstrates: statistical signal detection, ML-assisted prioritization, engineering review workflow

Manufacturing QualityAnomaly RankingCorrective Action

UFS Yield Excursion Analysis

Multi-month NGBin 19/109 trend review connecting backend MBT failures to wafer-edge process patterns.

Demonstrates: yield excursion review, process-pattern investigation, wafer-edge trend analysis

UFS V5 ITNGBin 19/109wafer-edge trend

SMT Calibration Quality Case

From LI 4523 symptoms and MLCC damage to an upstream SMT process-control signal.

Demonstrates: downstream symptom tracing, upstream process-control signal detection, corrective-action monitoring

LI 4523MLCC damageSMT calibration

Manufacturing Quality Tableau Dashboard

Synthetic-data Tableau dashboard for yield trend, defect Pareto, equipment concentration, retest behavior, and corrective-action validation.

Demonstrates: dashboard-based quality review, abnormal-signal communication, post-action validation

TableauManufacturing QualityDefect Pareto

Method

How I work

Detect

Identify abnormal yield movement, repeated failures, and equipment- or process-concentrated quality signals.

Analyze

Use test logs, retest behavior, failure-code distribution, and process history to separate false failures from true product-quality risks.

Act

Translate data evidence into issue ownership, corrective-action proposals, and cross-functional review points.

Validate

Monitor post-action yield movement, defect recurrence, and quality-risk indicators to confirm whether the action was effective.

Systematize repeated reviews into scripts, dashboards, and workflow systems so quality signals remain visible over time.

Target Role Fit

Product Quality / Failure Analysis / Manufacturing Data / Corrective Action

This portfolio is most relevant to roles involving:

  • Product quality improvement in high-volume manufacturing
  • Failure analysis support and defect-pattern investigation
  • Yield movement review and false-fail separation
  • Manufacturing data analysis with Python / SQL
  • Quality monitoring dashboards and automated reporting
  • Corrective-action tracking and post-action validation
  • Internal workflow systems for product evaluation and production-readiness review

Problems I enjoy solving

  • When first-pass failures do not tell the whole quality story
  • How to separate false failures from true product-quality risks
  • How to trace downstream test symptoms to upstream process drift
  • How to detect equipment- or process-concentrated defect patterns
  • How to make hidden calibration variation visible before defects recur
  • How to turn repeated quality reviews into automated monitoring workflows

Let's Work Together

Open to roles where manufacturing data, failure analysis, and software tooling are used to improve product quality and engineering decision-making.