Zizhou Wang
Software Engineer | Spring Boot, Spring Framework, AWS S3, Microservices, Distributed System
- Role
- Software Engineer at Walmart Global Tech
- Location
- Los Angeles, CA, US
- LinkedIn followers
- 500 followers
About Zizhou Wang
Passionate about building scalable and efficient backend systems, I specialize in Java…
Experience
Software Engineer
Apr 2025 — Present · Sunnyvale, CA, US
Built an enterprise search backend with Java + Spring, adding robust unit/integration tests (JUnit/Mockito) to improve reliability. Designed a BigQuery + JavaScript UDF telemetry pipeline to parse request telemetry, reconstruct span trees, and compute avg/p50/p99 latency and HTTP 4xx/5xx hotspots. Re-architected a legacy Spark/Hive workflow to a BigQuery-centric design, enabling same-day, full-day analytics and drastically cutting processing time. Authored Airflow DAGs (Python + Bash) to orchestrate ingestion, transformation, visualization export, and automated Confluence publishing, with SLAs/alerts for late or failed runs. Produced tree/flow visualizations showing dependencies, node health, and critical paths to speed bottleneck triage and on-call response. Published daily Confluence reports (key metrics, regressions, drill-downs) and persisted results to BigQuery, mirroring to GCS for durable, queryable history and low-cost backups. Hardened security by replacing hard-coded tokens with wmtframework-based token discovery/OAuth for Confluence publishing. Reduced deprecated/legacy code by 40% through consolidating scripts, standardizing shared SQL/UDF modules, and improving maintainability.
Skills
- Research
- C
- Powerpoint
- Microsoft Excel
- C++
- Matlab
- Autocad
- Java
- Numerical Analysis
- Microsoft Office
- Solidworks
- Microsoft Word
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