The value of systematic literature review and research synthesis for the professional development of undergraduate students is largely unknown. As such, opportunities to develop these skills may be underutilized by educators. Using quantitative and qualitative methods we assessed how participation in research synthesis improved the professional development of undergraduate students in ecology. We found improvements in motivation to pursue careers in ecology and self-confidence, which are two key aspects of professional development. Systematic literature review and research synthesis are critical skills for success in environmental sciences, yet opportunities to develop these skills may be scarce. Developing these important skills imparts significant benefits to the professional development of undergraduate students, and educators should not hesitate to offer opportunities based on these skills.