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Senior Machine Learning Engineer (Fraud ML)

1 month ago
Canada
Full-time
Senior
Machine Learning Engineer
Software Development
Apache Airflow Apache Spark CatBoost Kubeflow LightGBM Machine Learning MLflow Python PyTorch XGBoost
Apply Now
Affirm

Affirm

Affirm offers a transparent buy now, pay later service founded in 2012 by Max Levchin. No late fees or surprises, just a responsible way to pay over time for your favorite brands.

Diversified Financial Services
1K-5K
Founded 2012
View All Jobs 158

Description

  • Lead development of new fraud prediction models using tabular, graph, and behavioral data.
  • Build and scale feature pipelines and training datasets from proprietary and third-party signals.
  • Prototype new modeling ideas and features, run offline experiments, and promote the best approaches into production with appropriate risk controls.
  • Productionize models by integrating them into batch and/or real-time decision systems.
  • Improve model reliability, latency, and operational robustness.
  • Instrument and monitor model and data health as fraud patterns evolve.
  • Define retraining and backtesting workflows to keep models effective over time.
  • Identify and implement foundational improvements to the team’s model-building process.
  • Collaborate with Engineering, Fraud Analytics, Product, and ML Platform to define requirements, evaluate tradeoffs, and communicate results.

Requirements

  • 6+ years of experience researching, training, tuning, and launching ML models at scale; a relevant PhD may count for up to 2 years of experience.
  • Track record of delivering high-impact machine learning models in a low-latency live setting.
  • Strong Python skills and experience writing production-quality code.
  • Experience building and evaluating tabular classification models, preferably with gradient-boosted decision trees such as LightGBM, XGBoost, or CatBoost.
  • Experience with a deep learning framework, preferably PyTorch.
  • Experience with distributed data processing or parallel compute frameworks, preferably Spark; Ray or Dask is also relevant.
  • Experience with ML lifecycle tooling for orchestration, experimentation, and model monitoring, such as Kubeflow, Airflow, or MLflow.
  • Proficiency with AI-powered developer tools such as Claude Code or Cursor to speed iteration, debugging, and code quality.
  • Ability to turn simple business problems into solutions spanning multiple software components and deliver clear, tested, extensible code.
  • Comfort navigating large codebases, debugging other engineers’ code, and giving code review feedback.
  • Demonstrated ownership of personal growth and a habit of seeking feedback proactively.
  • Strong verbal and written communication skills for collaboration with a global engineering team.

Benefits

  • Remote-first work environment with the flexibility to work almost anywhere within the country of employment.
  • Base salary range of CAD $150,000 to $200,000 per year.
  • Equity eligibility through Affirm Holdings, Inc. rewards.
  • Monthly stipends for health, wellness, and tech spending.
  • 100% subsidized medical, dental, and vision coverage for employees and dependents.
  • Generous flexible spending wallets for technology, food, lifestyle needs, and family-forming expenses.
  • Competitive vacation and holiday schedules.
  • Employee stock purchase plan with the ability to buy Affirm shares at a discount.

Interested in this position?

Apply directly on the company website

Apply Now

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