Data Scientist III

This is a fully remote position, open to applicants in Brazil.

📋 Description

• Develop and enhance fraud prevention intelligence.

• Mitigate financial losses and decrease chargebacks.

• Detect weaknesses in protective measures.

• Suggest corrective and preventive strategies.

• Design, implement, and advance recommendation models for various use cases and channels, ensuring optimal performance, scalability, and quality.

• Establish success metrics, including precision, recall, and business impact.

• Organize and refine the alert monitoring and prioritization process, boosting the team's operational efficiency.

• Create and enhance procedures for assessing, validating, and overseeing fraud detection models and rules.

• Assist in the technical development of less experienced analysts by sharing expertise and best practices.

⛳️ Requirements

• Strong understanding of statistics and experience in applying Machine Learning techniques to fraud detection.

• Proficient in Python and ML libraries, including Scikit-learn, XGBoost, and related tools.

• Skilled in SQL for handling large data sets using Spark, Databricks, and BigQuery.

• Capable of translating technical insights into business implications.

• Experience in merchant acquiring or with card-present and card-not-present transactions (credit and debit) is a plus.

• Familiarity with decision engines such as Feedzai, FICO, ClearSale, or Cybersource is advantageous.

• Experience in structuring fraud prevention policies, procedures, and processes is a plus.

🏝️ Benefits

• Fixed salary.

• Variable compensation package* (profit sharing, long-term incentive plan, or commission — based on role eligibility; employees cannot freely choose the applicable model).

• Copay health and dental insurance (excluding employees with disabilities, who are exempt from copayments).

• Verde Virtual Hospital: telemedicine team available 24/7.

• Medication subsidy.

• Meal and/or food allowance — Pluxee*.

• Childcare assistance (for children up to 5 years and 11 months old).

• Support for employees with children with disabilities.

• Life insurance.

• Fuel or commuting allowance*.

• Home office allowance* (available for Hybrid or Remote contracts only).

• Welcome kit for new parents.

• SESC partnership*.

• Education benefit — internal self-development platform (Studa and Stone Library).

• Acolhe360º — free emotional support.

• Quick massage and on-site clinic*.

• Optional benefits: Wellhub, TotalPass, Pet Club, Flash, Férias&Co, transportation voucher, Allya, and educational partnerships.

• All Stone positions are also open to individuals with disabilities.