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I am a Staff ML Engineer focusing on backend systems, large-scale data pipelines, recommendation systems, content moderation, and emerging LLM-agent architectures. At Glassdoor, I delivered multi-stage job recommendations, built a cross-brand policy-aware RAG moderation system, and architected an AI support agent powered by LangGraph. I previously designed Spark pipelines and full-stack analytics tools for healthcare claims and payment integrity at Cotiviti, and I enjoy turning complex data problems into scalable production systems. I thrive in building end-to-end data tooling and distributed systems that ship value in production.…I am a Staff ML Engineer focusing on backend systems, large-scale data pipelines, recommendation systems, content moderation, and emerging LLM-agent architectures. At Glassdoor, I delivered multi-stage job recommendations, built a cross-brand policy-aware RAG moderation system, and architected an AI support agent powered by LangGraph. I previously designed Spark pipelines and full-stack analytics tools for healthcare claims and payment integrity at Cotiviti, and I enjoy turning complex data problems into scalable production systems. I thrive in building end-to-end data tooling and distributed systems that ship value in production.

YIXUAN (PHILLIP) G U

Data Scientist, Full Stack Developer, Back-End Developer, +4

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I am a Staff ML Engineer focusing on backend systems, large-scale data pipelines, recommendation systems, content moderation, and emerging LLM-agent architectures. At Glassdoor, I delivered multi-stage job recommendations, built a cross-brand policy-aware RAG moderation system, and architected an AI support agent powered by LangGraph. I previously designed Spark pipelines and full-stack analytics tools for healthcare claims and payment integrity at Cotiviti, and I enjoy turning complex data problems into scalable production systems. I thrive in building end-to-end data tooling and distributed systems that ship value in production.…I am a Staff ML Engineer focusing on backend systems, large-scale data pipelines, recommendation systems, content moderation, and emerging LLM-agent architectures. At Glassdoor, I delivered multi-stage job recommendations, built a cross-brand policy-aware RAG moderation system, and architected an AI support agent powered by LangGraph. I previously designed Spark pipelines and full-stack analytics tools for healthcare claims and payment integrity at Cotiviti, and I enjoy turning complex data problems into scalable production systems. I thrive in building end-to-end data tooling and distributed systems that ship value in production.

Available to hire

I am a Staff ML Engineer focusing on backend systems, large-scale data pipelines, recommendation systems, content moderation, and emerging LLM-agent architectures. At Glassdoor, I delivered multi-stage job recommendations, built a cross-brand policy-aware RAG moderation system, and architected an AI support agent powered by LangGraph.

I previously designed Spark pipelines and full-stack analytics tools for healthcare claims and payment integrity at Cotiviti, and I enjoy turning complex data problems into scalable production systems. I thrive in building end-to-end data tooling and distributed systems that ship value in production.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Software Engineer at Glassdoor

July 1, 2019 - November 1, 2021

Maintained indexing pipelines, consolidated Lucene indexes into OpenSearch, and added similarity embeddings to ranking, supporting improved search and discovery features.

Voyager Search at Glassdoor

November 1, 2021 - March 1, 2022

Helped migrate legacy job and employer search services from Solr and Lucene to Elasticsearch/OpenSearch. Productionized ranked search models and enhanced observability with Docker, Kubernetes, Prometheus, and Grafana.

Senior Machine Learning Engineer at Glassdoor

March 1, 2022 - July 1, 2024

Atlas (Job Discovery & Recommendation): designed a production multi-stage recommender; built hybrid candidate generation using OpenSearch BM25 and ANN vector search; integrated AI Guided Job Search; developed LLM-based match-quality labeling and RAG-based job insights.

Staff Machine Learning Engineer at Glassdoor

July 1, 2024 - Present

Aquila (Glassdoor Support AI Assistant): Architected LangGraph-based multi-agent workflow for routing, retrieval, reasoning, and escalation across support domains; built MCP tool layer exposing internal systems as safe tools; implemented a policy-aware RAG moderation layer with citations; added automated escalation and telemetry.

Software Engineer at Cotiviti

November 1, 2015 - July 1, 2019

Spark pipelines powering payment integrity analytics in a healthcare data lake; Spark ETL for multi-terabyte claims; validation and anomaly detection; built full-stack analytics portal (REST/GraphQL backends, React dashboards); RBAC, export tools, search; Docker deployment and on-call support.

Senior Software Engineer at Glassdoor - Voyager Search

November 1, 2021 - March 1, 2022

Helped migrate legacy job and employer search services from Solr/Lucene into Elasticsearch/OpenSearch. Productionized ranked search models. Added Docker, Kubernetes, Prometheus and Grafana.