Senior AI Research Engineer

Join the Duolingo Video Call team to build and improve AI systems that enhance the learning experience. You’ll help develop, train, fine-tune, and evaluate machine learning models—spanning large language models, speech recognition, and text-to-speech—while supporting deployment and monitoring. Work with frontend, backend, and cross-functional partners to align model outputs with product goals, mentor teammates, and ensure delivery of high-quality, scalable ML solutions.