This study integrated Project-based learning (PBL) in an online environment and aimed to investigate critical issues, dynamics, and challenges related to PBL from 49 student perspectives in an online course. The effect of PBL was examined qualitatively with open-ended questionnaire, observations, and students' submissions who were taking an online certificate course. According to the findings, students thought that an online PBL course supports their professional development with provision of practical knowledge, enhanced project development skill, self confidence, and research capability. This support is further augmented with the facilities of the online learning environment. Students mainly preferred team-work over individual work. Although students were mostly satisfied with the course, they still had some suggestions for prospective students and instructors. The findings are particularly important for those people who are planning to organize course or activities which involve online PBL and who are about take an online or face-to-face PBL course.