This study focuses on understanding the impact of the onboarding process on employee performance in IT firms. Onboarding is an important human resource practice that helps new employees adjust to their job roles, work environment, and organizational culture. The main objective of this research is to analyze how onboarding activities such as training, orientation, and support influence employee performance, productivity, and job satisfaction. A quantitative research method was used, and data was collected from employees through a structured questionnaire. Statistical tools like regression analysis and ANOVA were applied to examine the relationship between onboarding and employee performance. The findings indicate that effective onboarding helps employees gain confidence, improve their skills, and perform their tasks more efficiently. Proper onboarding also reduces confusion, increases job satisfaction, and supports long-term organizational growth. Therefore, onboarding plays a significant role in improving employee performance in IT firms.