In 2023, Nepal received approximately 104,885 foreign visitors for various reasons, including business, family visits, and educational purposes. As the primary gateway for these visitors, the effectiveness and user-friendliness of Nepal's online immigration services are crucial. The Nepal immigration website plays a key role in facilitating visa applications, underscoring the need for an intuitive and user-friendly platform. This paper reviews major usability principles and explores the application of Human-Computer Interaction (HCI) components to improve the existing immigration website. By integrating Schneiderman's eight golden rules for interface design with heuristic evaluation and applying Fitts' Law along with eye tracking for usability testing, this paper proposes a dependable, evidence-based approach to designing a user interface for the immigration website. The engineering design process was used, and the Questionnaire for User Interface Satisfaction (QUIS) was completed as part of the studies. This paper aims to positively impact developers working on User Interface/User Experience (UI/UX) and Human-Computer Interaction (HCI), especially for websites that enhance digital platforms crucial to a nation's operational efficiency, such as the immigration website.