We present an experience report on moving face-to-face classes in a large CS1 course to an online format, during the COVID-19 pandemic. The course is based on the flipped classroom approach and team-based learning. Students prepare for classes by reading specific chapters of the textbook and/or by watching pre-recorded videos. The classes are synchronous, in which students take quizzes and work on programming assignments in teams, with the guidance of tutors. To evaluate the implementation, we

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... ompared the results from surveys and exams between 2019 and 2020. The results show that students were at least as satisfied with the online classes in 2020 in comparison with face-to-face classes from the previous year, and generally satisfied with the organization of the course and the learning experience. Moreover, we found no discernible change in the grades on the midterm exams and the final exam between the two years. In the future, we might allow the students to choose the class format that best fits their individual needs.