Data Scientist – AI Training & Evaluation

About The Role We're looking for data scientists based in São Paulo to help train, evaluate, and improve next-generation AI systems. You'll leverage your expertise in statistics, machine learning, and data analysis to assess AI model outputs, design evaluation frameworks, and ensure AI systems deliver accurate, reliable results. • Organization: Alignerr • Type: Hourly Contract • Compensation: $25–$40 /hour • Location: Remote • Commitment: 10–40 hours/week What You'll Do • Evaluate AI model outputs for accuracy, reasoning quality, and statistical soundness • Design and apply data-driven evaluation criteria and scoring rubrics • Analyze patterns in AI-generated responses to identify systematic errors or biases • Create high-quality training data including prompts, solutions, and annotations in your areas of expertise • Provide structured, detailed feedback to improve model performance across data science and analytical tasks • Review AI-generated code, visualizations, and statistical analyses for correctness • Work independently and asynchronously on your own schedule Who You Are • Based in São Paulo, Brazil • Degree in Data Science, Statistics, Computer Science, Mathematics, or a related quantitative field (MS or PhD preferred) • Strong foundation in statistics, probability, and machine learning concepts • Proficiency in Python, R, SQL, or similar data analysis tools • Experience with data wrangling, exploratory data analysis, and model evaluation • Excellent analytical thinking and attention to detail • Strong written communication in English — able to explain complex technical concepts simply • Self-motivated and comfortable working independently Nice to Have • Experience with deep learning frameworks (PyTorch, TensorFlow) • Familiarity with NLP, LLMs, or AI evaluation workflows • Published research or industry experience in applied machine learning • Background in A/B testing, causal inference, or experimental design Why Join Us • Work on cutting-edge AI projects shaping the future of technology • Collaborate with top research labs and AI teams globally • Freelance perks: full autonomy, flexible scheduling, and remote-first culture • Gain deep exposure to how state-of-the-art LLMs are trained and evaluated • Potential for ongoing work and long-term contract extension • Be part of a growing community of expert contributors making AI smarter Application Process (Takes 10–15 min) • Submit your resume • Complete a short screening • Project matching and onboarding PS: Our team reviews applications daily. Please complete your application steps to be considered for this opportunity.