Yongwoo Noh

Senior Machine Learning Engineer

Pinterest

Built end-to-end board recommendation pipeline including graph embedding retrieval, ANN candidate generation, multi-task PyTorch ranker, and serving. Integrated lifelong user history with real-time session streams and ran A/B experiments to improve recommendation quality.

PyTorchFaissPinSage GNNSparkKafkaApache FlinkStatsigTransformersGNNFeature StoresA B TestingRecommendation Systems

Senior Machine Learning Engineer

Block / Cash App

Owned Cash App search ranking and ML inference platform serving the entire ML org. Trained XGBoost and Transformer re-rankers for payee search and architected unified deployment for multiple model families.

XGBoostTransformersDockerKubernetesAWS SagemakerMetaflowMLFlowgRPCSnowflakeDBTDatadogStatsigFeature Stores

Senior Machine Learning Engineer

Improved Home Timeline heavy ranker features using SimClusters, GraphJet, and engagement history. Rebuilt training pipelines and automated model refresh, cutting model staleness from ~7 days to ~1 day.

SimClustersGraphJetKafkaHiveCortexStarlarkA B TestingRankingFeature Engineering

Software Engineer

Built query processing, job indexing, ML ranking integration, and gRPC response serving for Cloud Talent Solution. Owned title, seniority, and industry normalization pipeline and shipped API to production across 3,000+ job properties.

NLPLearning To RankBigQuerygRPCProtocol BuffersSearchClassification

Senior Software Engineer - Machine Learning / Data Mining

Operated across ML ranking for Job Search and Job Recommendations, and backend platform for Galene search-as-a-service. Trained GBDT and GLMix personalization models on professional graph features and extended Galene with vertical-specific ranking APIs.

GBDTGLMixHadoopHiveAzkabanEspressoApache PinotVeniceGaleneSearchRecommendation Systems