Objective: To test the feasibility and efficacy of an enhanced onboarding intervention to prevent weight gain and support the early job success of new bus operators. Methods: Control participants (n = 9) completed usual practice new employee training and onboarding. Intervention participants (n = 14) completed five supplemental trainings and four online challenges during their first year. Primary outcomes were body weight, dietary behaviors, physical activity, and sleep duration/quality. Early job success was measured with job-related socialization adjustment factors. Results: The difference between intervention and control participants in body weight change at 12 months tenure was -6.71 lb (Cohen's d = -1.35). Differences in health behavior changes were mixed, but socialization adjustment changes favored the intervention group. Conclusions: Results support the feasibility of enhanced onboarding for bus operators to prevent worsening health while simultaneously advancing their success as new employees.