Machine Learning Engineer

Location: Mississauga, Canada. Employment Type: Full-time. Work Arrangement: Hybrid. Department: Application Delivery Department. Job Summary

Express Scripts Canada is looking for a Machine Learning Engineer to design, build, and operate data pipelines and ML services that detect unusual patterns in healthcare claims and pharmacy transactions. The role blends hands‑on data engineering (Oracle + ETL), model development (unsupervised learning), and API serving (Python/FastAPI), with close collaboration across business teams. Key Responsibilities

Design and implement ML data pipelines to ingest, engineer, and persist features from Oracle databases. Build and validate unsupervised ML models (MiniBatchKMeans/KMeans, DBSCAN) with dimensionality reduction and evaluation metrics. Serve models as REST APIs using FastAPI/Pydantic, including health endpoints, CORS, structured response models, and operational logging. Orchestrate end‑to‑end vali...