Amid growing concerns about students' declining interest and proficiency in science, technology, engineering, and mathematics [STEM] subjects, this study underscores the urgent need for innovative educational interventions. It does so by investigating the impact of week-long residential STEM summer camps on the career interests of middle and high school students, using both quantitative and qualitative methods. By employing a tool for assessing responsibility-based education in conjunction with the STEMCIS, we aimed to identify a shift in interest and a lasting commitment to exploring careers in STEM fields. The results of pre- and post-camp surveys revealed a statistically significant increase in students' career interest, especially in engineering, emphasizing the positive impact of STEM summer camps on shaping students' future career trajectories. Qualitative data also indicated that participation in STEM summer camps enhanced students' interest in STEM-related careers and their understanding of both the practical applications of STEM concepts and the opportunities available in STEM careers. These findings contribute to pedagogical research by demonstrating how informal STEM programs can complement formal education, promote equity, and support career development. We recommend that educators, school leaders, and policymakers invest in and expand access to such programs to cultivate a diverse and skilled STEM workforce, thereby promoting equity and building a workforce that is both diverse and qualified to meet the demands of a technology-driven society.