Upstart is seeking a Senior Software Engineer for their Machine Learning Simulations Platform to design and implement scalable simulation systems that enhance machine learning model evaluation. The role involves collaborating with data scientists and engineers to develop tools that support extensive experimentation and analysis of credit risk models. Candidates should have strong software engineering skills, experience in Python and distributed systems, and a deep understanding of machine learning concepts. This full-time position is based in the San Francisco Bay Area and offers an opportunity to impact the future of AI-driven lending.