Senior Data Scientist - Fraud Detection

DataVisor; Toronto; On-site; CAD 120,000 - 150,000; Full time

Benefits offered by this job

Stock Options

Health Benefits

PTO

Job summary

DataVisor is seeking a Senior-Level Data Scientist to join our Fraud Detection team in Toronto. You will build production ML models and personally lead investigations into fraud cases, reconstruct attacker behavior, and translate findings into detection improvements.

You will develop end-to-end fraud solutions, handle large-scale data, and communicate insights to cross-functional teams, including executives, in a fast-paced, data-driven environment.

Qualifications

• Master's or PhD in Computer Science, Statistics, Mathematics, or a related quantitative field.
• 3+ years of applied experience in fraud detection, cybersecurity, or risk domain.
• Strong programming in Python and proficiency with SQL; PySpark a plus.

Responsibilities

• Lead end-to-end fraud detection feature development from ideation to productionizing and monitoring.
• Develop highly predictive features from large-scale data including user behavior and device intelligence.
• Lead investigations into complex fraud cases, reconstruct attacker sequences, and generate actionable reports and trend analyses.
• Communicate findings clearly to product, engineering, operations, and executives.

Skills

Python

SQL

PySpark

Spark

Cloud platforms

Communication skills

English proficiency

Education

Master's or PhD in CS/Statistics

Tools

Hadoop

AWS

GCP

Azure

Spark

Job description

About DataVisor

DataVisor is the world's leading AI-powered Fraud and Risk Platform that delivers the best overall detection coverage in the industry. With an open SaaS platform that supports easy consolidation and enrichment of any data, DataVisor's fraud and anti-money laundering (AML) solutions scale infinitely and enable organizations to act on fast-evolving fraud and money laundering activities in real time. Its patented unsupervised machine learning technology, advanced device intelligence, powerful decision engine, and investigation tools work together to provide significant performance lift from day one. DataVisor's platform is architected to support multiple use cases across different business units flexibly, dramatically lowering total cost of ownership compared to legacy point solutions. DataVisor is recognized as an industry leader and has been adopted by many Fortune 500 companies across the globe.

Our award-winning software platform is powered by a team of world-class experts in big data, machine learning, security, and scalable infrastructure. Our culture is open, positive, collaborative, and results-driven. Come join us!

Position Overview

We are looking for a Senior-Level Data Scientist to join our Fraud Detection team — someone equally comfortable building production ML models and getting hands-on with individual fraud cases. This is a dual-track role: you'll develop the machine learning systems that catch fraud at scale, and you'll personally lead investigations into how specific fraud attacks happened, reconstructing attacker behavior and turning case-level findings into trend reports and detection improvements. This is a great opportunity to grow your skills in a fast-paced, data-driven environment while making a real, visible impact in the fight against fraud.

Key Responsibilities

• Machine Learning & Model Development
  • End-to-End Model Development: Lead the full lifecycle of fraud detection features and models, from ideation and data exploration to prototyping, productionizing, and monitoring
  • Advanced Feature Engineering: Develop highly predictive features from complex, large-scale, multi-dimensional data, including user behavior, device intelligence, network graphs, and transaction records
  • Large-Scale Data Processing: Work with massive, noisy, and imbalanced datasets (billions of events) using tools like Spark, SQL, and our proprietary AI platform
  • Agentic AI & Automation: Leverage agentic AI to automate analytic pipelines and develop reusable skill tools that accelerate fraud investigation, feature generation, and reporting workflows
• Live Fraud Investigation & Reporting
  • Lead investigations into complex fraud cases across identities, accounts, devices, and transaction surfaces. Reconstruct attacker sequences and hypothesize actor intent and tooling
  • Produce clear, evidence-backed technical reports and case studies for product, engineering, operations, legal, and executive stakeholders
  • Generate fraud trend reports for customers, synthesizing case-level findings and aggregate data into narratives customers can act on

Requirements

Qualifications

• Master's or PhD in Computer Science, Statistics, Mathematics, or a related quantitative field.
• 3+ years of applied experience in fraud detection, cybersecurity, or a related adversarial/high-velocity risk domain (fintech, consumer payments, banking, SaaS, marketplace risk, or security research)
• Solid understanding of both classic machine learning models (Logistic Regression, Gradient Boosting, etc.)
• Hands-on experience with the machine learning lifecycle in a production environment
• Investigator mindset: demonstrated skill in pattern synthesis, hypothesis testing, and triaging signal from noise in ambiguous, adversarial cases — not just building and monitoring models
• Strong programming skills in Python (must-have) and proficiency with SQL; experience with PySpark is a significant plus
• Experience with large-scale data tools (Spark, Hadoop, etc.) and cloud platforms (AWS, GCP, Azure)
• Excellent communication skills — able to explain complex, ambiguous, or technical behavior clearly to both technical and non-technical audiences, including customers and executives
• Professional proficiency in written and spoken English, with the ability to collaborate effectively in a global, cross-functional team

Benefits

• Base salary range: $120,000-$150,000, commensurate with experience
• PTO, Stock Options, Health Benefits