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 respo...