Machine Learning Engineer

Sift is the AI-powered fraud platform securing digital trust for leading global businesses. As a Machine Learning Engineer, you will bridge the gap between data science and large-scale distributed systems, building end-to-end pipelines and maintaining an automated machine learning ecosystem.

Responsibilities:

• Model Development & Refinement: Design, build, and deploy online machine learning models (including ensemble methods, deep learning, transformer architectures and graph-based models) to catch evolving fraud vectors in real time
• Feature Engineering at Scale: Engineer high-frequency time-series features from over 1 trillion behavioral events, optimizing for low-latency signal extraction and pattern recognition
• Production MLOps: Maintain and enhance our automated model training and deployment infrastructure, ensuring frictionless continuous integration and continuous deployment (CI/CD) of newly trained models
• System Optimization: Write high-performance code to minimize scoring latency at runtime, ensuring our core ML services scale seamlessly across distributed databases
• Collaborative Innovation: Work cross-functionally with Core Infrastructure, Product Management, and Data Science teams to translate business-level fraud patterns into robust algorithmic solutions

Requirements:

• 4+ years of professional experience building and deploying large-scale machine learning models into high-traffic production environments
• Strong proficiency in Java or Scala (for our production backend) as well as Python (for data analysis and model prototyping)
• Practical experience with Databricks and big data processing frameworks like Apache Spark, Apache Flink, or Hadoop, and working with NoSQL data stores like Bigtable
• Deep understanding of statistical modeling, probability, and standard machine learning algorithms (e.g., XGBoost, Random Forests, Neural Networks, and Clustering techniques)
• Ability to reason through data consistency, pipeline failures, and performance constraints in a distributed, multi-tenant cloud environment (GCP)
• Experience explicitly in the fraud detection, risk mitigation, or cyber-security domains
• Deep knowledge of streaming architectures (e.g., Apache Kafka)
• Familiarity with containerization and orchestration tools like Docker and Kubernetes
• Familiarity with leveraging AI coding assistants (e.g., Claude Code) to accelerate development and model prototyping