Staff AI Research Engineer

Staff AI Research Engineer We are looking for an experienced AI Research Engineer to join the Duolingo Monetization team. The ideal candidate will have a proven track record as an AI research engineer, with extensive experience across various machine learning techniques including large language models, multi‑armed bandits, and more. They will have experience at all levels of the ML stack, including feature engineering, developing training data, fine‑tuning, reinforcement learning, quality evaluations, deployment, and monitoring. On the Monetization team, we are building AI systems to improve the learning experience while driving our business, including deploying our research into bandit models to balance revenue and retention. A broad set of AI domains and broad experience in AI/ML is highly desirable. You Will Join a full‑stack team of frontend, backend, and other AI Research engineers, fostering a collaborative and innovative work environment. Contribute to the development and training of bandit models and large‑scale neural network models. Collaborate with cross‑functional teams to understand their needs and align the models’ outputs with company objectives. Participate in and help drive strategic product and business decision‑making as a member of the Monetization leadership group. Stay up‑to‑date with the latest developments in machine learning, particularly in LLMs and bandits, and apply this knowledge to drive advancements in our projects. Mentor team members, providing guidance and support in their professional development. Ensure the delivery of high‑quality, scalable, and efficient machine learning solutions. You Have Proven experience as an AI research engineer, for example, in LLMs, bandits, computer vision, or related fields. Strong background in training and fine‑tuning large models in an applied setting. Advanced degree in Computer Science, Engineering, or a related field with a focus on machine learning or artificial intelligence, or equivalent experience. Excellent leadership and communication skills, with the ability to manage and inspire a team. Deep understanding of machine learning concepts, frameworks, and best practices. Salary Range

$220,800 - $331,200 USD

Accommodations We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact [email protected] Equal Employment Opportunity Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. Fraud Warning Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we'll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double‑check these details before sharing any information. #J-18808-Ljbffr TrulyHired