The development of elementary-aged students' STEM and computer science (CS) literacy is critical in this evolving technological landscape, thus, promoting success for college, career, and STEM/CS professional paths. Research has suggested that elementary-aged students need developmentally appropriate STEM integrated opportunities in the classroom; however, little is known about the potential impact of CS programming and how these opportunities engender positive perceptions, foster confidence, and promote perseverance to nurture students' early career aspirations related to STEM/CS. The main purpose of this mixed-method study was to examine elementary-aged students' (N = 132) perceptions of STEM, career choices, and effects from pre-to post-test intervention of CS lessons (N = 183) over a three-month period. Findings included positive and significant changes from students' pre-to post-tests as well as augmented themes from 52 student interviews to represent increased enjoyment of CS lessons, early exposure, and its benefits for learning to future careers. Keywords Elementary STEM education • Motivation • Computational thinking • Careers education and to improve workforce development (Barr and Stephenson 2011), the field of CS has included CT with existing K-12 content and curriculum (Jona et al. 2014; Israel et al. 2015; Wilensky et al. 2014). Moreover, embedding CT concepts, its tools and practices into interdisciplinary contexts especially in math and science promotes students' understanding of the fields, equips them with foundational STEM knowledge, increases career aspirations in STEM, and creates students who are more productive STEM citizens (Augustine 2005; Weintrop et al. 2016). 2.1 Essential Computational Thinking in the Early Years Elementary-aged students need exposure to interdisciplinary STEM/CS content to collaborate , explore, create models, analyze, and draw conclusions. These skills are applicable to many areas of students' lives, thus, promoting their development is essential in today's classrooms. Past research has suggested improved cognitive benefits such as problem-solving, mathematics, and reasoning for children who participated in computer programming as compared to children who did not participate in similar learning experiences (Clements et al. 2001; Liao and Bright 1991). Other benefits included long-term effects such as increased enjoyment with inquiry-based learning, sustained attention, and self-direction, (Clements 1987). Contemporary programming literature emphasized ongoing support for children to engage in innovative programming environments and languages such as Scratch, Kodu, Etoys, and Lego We-Do since they provide age-appropriate materials for children to apply core CT concepts such as abstraction, automation , analysis, decomposition, and iterative design (Bers and Horn 2010; Mioduser et al. 2009; Resnick 2006). Existing benefits indicated that inquiry-based science, numeracy, and literacy activities during preprimary and primary years provide elementary-aged students approp...