Data Scientist

Data Scientist Washington, DC Must have skills. Python, TensorFlow ,PyTorch, Spark, data analysis ,Datamodeling. Role Summary We are seeking a highly skilled Senior Data Scientist with expertise in Machine Learning, Artificial Intelligence, Large Language Models (LLMs), foundation models, and fine-tuning techniques. This position is ideal for someone who is passionate about building enterprise-grade AI & ML applications and applying cutting-edge techniques to real-world financial and payments challenges. Key Responsibilities • Design, build, and optimize Generative AI, LLM, and multimodal foundation models for enterprise fintech applications. • Fine-tune or adapt open-source and proprietary models Build high-performance models for NLP, document intelligence, anomaly detection, risk scoring, predictive analytics, and decisioning use cases. • Lead experimentation to evaluate model accuracy, scalability, and fairness. Partner with engineering teams to deploy models on cloud-based ML pipelines (Azure, AWS) & data platforms (Databricks & Snowflake) Work with large-scale structured and unstructured datasets across the payments and financial ecosystem. • Implement model monitoring, drift detection, and continuous retraining strategies. Evaluate and operationalize new AI technologies, foundation model architectures, responsible AI frameworks, and emerging research. • Drive POCs and innovation initiatives that enhance Fiserv s AI capabilities and differentiate our products. • Required Qualifications Master s or PhD in Computer Science, Data Science, Machine Learning, AI, or related field. 8+ years of hands-on experience building and deploying machine learning models in production. • Proven expertise with LLMs, transformer architectures, transfer learning, and model fine-tuning. Strong proficiency in Python, PyTorch or TensorFlow, and ML libraries such as Transformers. Experience with cloud ML platforms, containerization (Docker/Kubernetes), and MLOps tools. • Solid understanding of statistical modeling, optimization, and evaluation methodologies. Strong communication skills and ability to collaborate in cross-functional, fast-paced environments. Preferred Qualifications • Experience working in fintech, payments, banking, or fraud/risk environments. • Background in vector databases, RAG pipelines, and knowledge graph integration. • Experience with data privacy, model governance, and Responsible AI frameworks. • Contributions to open-source AI/ML communities or research publications.