Senior Data Science - Fraud Prevention

Description

Job Summary: Fraud Prevention professional to develop and optimize Machine Learning and AI models, ensuring transaction security and accelerating Mercado Livre's growth. Key Highlights: 1. Develop and optimize Machine Learning models for fraud detection. 2. Create AI agents, computer vision models, and LLMs for automation and validation. 3. Dynamic and innovative environment focused on growth and learning. At Mercado Livre, we are democratizing commerce and financial services to transform people's lives across Latin America. Join us in this mission! Fraud Prevention is the internal and external reference unit for all security-related topics concerning transactions within the Mercado Livre ecosystem. We ensure operational security for platform users by applying analytical-predictive tools, models, and innovative technologies. We are the company area that enables risk-taking and accelerates growth. Within the team, we must be capable of co-creating secure products and leveraging deep ecosystem knowledge to identify vulnerabilities and proactively act through technology, processes, and people—aiming to deliver a trustworthy experience that creates value for our service users. **We seek individuals who:** * Embody entrepreneurial energy: driven by curiosity, never giving up, and focused on surpassing their own limits. * Give their utmost because they love working with commitment and dedication. * Embrace change as opportunity and learn from their mistakes. * Prioritize excellence and execution in everything they do. * Foster a positive atmosphere, joy, and fun. * Know how to build together with others and enjoy working in teams. Imagine yourself leading challenging, dynamic, and innovative projects and **being responsible for**: * Developing machine learning models to detect and prevent complex fraud patterns in real time, analyzing large volumes of transactional data to identify anomalous behaviors and risk trends. * Implementing scalable predictive solutions, ensuring proper integration with production architecture. * Designing controlled experiments to measure the impact of new models on key business metrics. * Optimizing existing algorithms to improve solution accuracy and computational efficiency. * Creating AI-powered agents, computer vision models, and LLMs to automate operations and analyze images during identity verification. **Requirements:** * Solid expertise in Data Science and Machine Learning to analyze fraud cases and propose data-driven solutions. * Strong foundation in mathematics and statistics applied to predictive models and solutions. * Ability to understand business use cases and metrics to develop technical solutions fully aligned with departmental objectives. * Experience developing computer vision models, Generative AI, LLMs, and natural language processing techniques. **We offer you:** * The opportunity to join an entrepreneurial company where we love thinking big and long-term. * The chance to take ownership of your development in an environment rich in opportunities, learning, growth, expansion, and challenging projects. * Collaboration and knowledge-sharing with outstanding professionals and experts. * An excellent work environment, equipped with everything you need to have a remarkable experience