Senior AI Research Engineer
Core
Building AI systems for video calls to support Duolingo's core learning mission and improve user habits.
Role type
Senior AI Research Engineer (Video Call team)
Builds
Large-scale neural networks, speech recognition, and text-to-speech systems for video call features
Domain
Education technology / AI / Machine Learning
Deliverable
production ML models
Required skills
LLMs, multimodal modeling, speech processing, training and fine-tuning large models, reinforcement learning, quality evaluation, deployment, monitoring, feature engineering, data development
Preferred skills
Experience across multiple levels of the ML stack, broad experience in AI/ML domains
Technologies
Large language models, speech models, neural networks
Responsibilities
Contribute to development and training of machine learning models; Collaborate with cross-functional teams to align model outputs with objectives; Participate in strategic product and business decision making; Stay up-to-date with latest ML developments; Mentor team members; Ensure delivery of high-quality, scalable ML solutions
Seniority
Senior, hands-on IC with mentorship responsibilities