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Role description

Senior Data Scientist 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. In this role, you will architect, build, and deploy advanced ML & AI solutions that power Fiserv's next-generation products across payments, fraud detection, risk decisioning, and financial data enrichment. 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. 5+ 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.

Skills

Data Science, Artificial Intelligence, MLOps, AWS

About UST
UST is a global digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact—touching billions of lives in the process.