Alex Scarlatos
Hello! I'm an AI research engineer at Duolingo. I got my PhD at the University of Massachusetts Amherst, working with Dr. Andrew Lan in the Machine Learning for Education (ML4Ed) lab. I got my BS/MS in Computer Science from Stony Brook University, where I focused on musical interfaces and game development.
My research augments large language models (LLMs) with student-centered objectives to enable high quality and personalized educational AI systems. My recent work achieves this goal via methods for faithfully simulating student behavior using LLMs, which inform rewards or other signals for AI teachers. I have published papers in NLP (ACL, EMNLP, NAACL) and education (AIED, LAK, EDM) conferences, but am also interested more broadly in machine learning, reinforcement learning, and musical applications of AI. Outside of research, my passions are writing and playing music, cinematography and photography, rock climbing, hiking, chess, and video games.
Experience
Duolingo
2026-Present
Details to come!
University of Massachusetts Amherst
2021-2026
I was in the ML4Ed lab, where I focused on training LLMs to tackle a variety of tasks in mathematics education. See my Research page for the list of papers I published during my PhD. I also designed and taught a freshman seminar, "The Age of Generative AI", and was a teaching assistant for "Reasoning Under Uncertainty".
Cambium Assessment
2025
I was a research intern where I developed a simulated student method for estimating the difficulty of open-ended assessment questions.
Google DeepMind
2023-2024
I was a student researcher on the amazing Magenta team, working with Dr. Anna Huang. During my time there, I built an interface for real-time musical jamming between humans and AI on the piano.
Bloomberg L.P.
2018-2021
At Bloomberg, I worked in the real-time enterprise data department as a full stack software engineer. My team revamped our whole workflow on a modern web stack (React/Flask/Postgres), where I was integral in both the development and design of the new architecture. I was also involved in developing and designing tools for continuous integration and continuous deployment (CI/CD), such as automated release systems and credential management frameworks, to make releasing code easier and more secure. I mentored 3 incoming team members by teaching them our business logic, helping them learn new technologies, and guiding them on projects. I also gave multiple presentations and live demos to both engineering and business teams.
Applied Visions
2016-2017
AVI is a software contracting company I interned at as a software engineer. I've worked on a variety of projects that involved manipulating data sets, building data visualization tools and developing software for the web. In addition to development, I worked closely with other employees on project planning. I participated in scrum meetings, sprint meetings, and gave presentations to co-workers on research and progress.
Eduware
2014-2015
Eduware is a small shop that develops exam-building software for secondary school teachers. I was a part-time web developer, working on the software's front-end, server and database within Microsoft's ASP.NET framework. I also worked on smaller projects using Flash and Unity3D. The company was the first major experience I had developing software and I owe them for getting me an early start in the field.