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Sebastian Sanchez

Certified

Fraud & Risk Data Analyst

Sezzle | Colombia

Technologies

Data gardener, nurturing insights to bloom and thrive in the data ecosystem.

My Work

Take a look at my latest work.

project

When Was the Golden Era of Video Games?

SQL
project

Factors that Fuel Student Performance

SQL
project

When Was the Golden Era of Video Games?

SQL

My Certifications

These are the industry credentials that I’ve earned.

Data Analyst Associate

Data Analyst Associate

Intermediate SQL

Intermediate SQL

DataCamp Course Completion

Take a look at all the courses I’ve completed on DataCamp.

Courses

Intermediate SQL
Joining Data in SQL
Understanding Cloud Computing
Data Manipulation in SQL

My Work Experience

Where I've interned and worked during my career.

Sezzle | Oct 2024 - Present

Risk, Fraud & Chargeback Data Analyst

Responsibilities * Monitored customer transactions and account behavior to detect and investigate suspicious activity, using behavioral triggers and risk-based thresholds. * Utilized fraud detection tools and SQL-based analysis to identify emerging patterns, anomalies, and fraud risks. * Conducted deep-dive investigations, documented findings, and collaborated with cross-functional teams to strengthen fraud controls. Achievements * Identified and blocked high-risky merchants by detecting suspicious behavior (e.g., velocity abuse, risky international transactions, and zero-dollar authorizations), mitigating financial exposure. * Designed and executed complex SQL queries based on relational data models to generate targeted insights for fraud detection and decision-making. * Developed custom queries aligned with operational needs, enabling rapid identification of shopper abuse, account manipulation, and payment fraud. * Led fraud prevention initiatives as Task Master, successfully detecting and stopping multi-account pay-to-self schemes used for personal financial gain. * Demonstrated strong motivation and potential for further development in Python programming and business intelligence tools, with a solid understanding of variables, functions, and introductory object-oriented programming principles, aiming to apply these skills to automate fraud detection and create dynamic visual reports. * Created detailed Google Sheets dashboards and documentation to track fraud prevention cases, using Pivot Tables, database-style structures, and advanced formulas to visualize and report impact.
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Motorola Mobility (a Lenovo Company) | Jan 2024 - Jul 2024

Finance Intern

* Manage the credit and accounts receivable processes for major Motorola Mobility clients in Colombia and Ecuador (including operators, wholesalers, and distributors). * Process re-invoicing and positive bases in the mentioned countries. * Special Achievement CASH CREDIT +120 Days: This project aimed to clear unapplied payments for various clients across LATAM REGION. As a result of developing this project, I managed to process these payments by 30% of their initial value . This resulted in an increase in the balance in favor of the respective accounts, leading to an increase in available funds.

Lean Solutions Group | Aug 2022 - Mar 2023

International Logistics Coordinator

* Shipment Coordination: Organizing and coordinating the transportation of goods, including arranging shipments, selecting carriers, and ensuring timely delivery. * Order Processing: Managing the order fulfillment process, from receiving orders to dispatching goods, ensuring accuracy and efficiency in order handling. * Vendor and Supplier Relations: Communicating and negotiating with vendors and suppliers to secure favorable terms, manage contracts, and resolve any issues that may arise. * Logistics Documentation: Preparing and maintaining all necessary documentation for shipments, including invoices, bills of lading, and customs

Teleperformance | Nov 2021 - Aug 2022

Bilingual Customer Service Representative

* Negotiation and Coordination: Negotiating rates and conditions with service providers and coordinating with multiple providers to ensure a seamless travel experience. * Payment and Billing Management: Handling payments and billing, ensuring all costs are transparent and accurate. * Advice and Consultation: Providing information and advice on travel destinations, accommodations, activities, weather, and other travel-related issues. * Booking Services: Booking flights, hotels, car rentals, tours, and other travel- related services.

My Education

Take a look at my formal education

Business, International BusinessUniversidad El Bosque | 2023
Trailhead by Salesforce
Bachelor's degree, AcademicColegio Mayor de San Bartolome | 2018

About Me

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