Access to psychological care remains critically limited in low-income communities, hindered by financial barriers, long waiting times, and a shortage of professionals. Digital health solutions offer a promising alternative to bridge this gap, provided they adhere to principles of usability, accessibility, and data protection. This paper presents PsiLink, a high-fidelity mobile prototype designed to connect volunteer psychologists with individuals experiencing socioeconomic vulnerability. Developed through a user-centered design approach, the system was informed by a requirements analysis conducted with both potential users and psychologists. Key features include secure session scheduling, professional verification, multiple communication channels, and strict compliance with the Brazilian General Data Protection Law (LGPD). Usability tests conducted with five participants, based on Nielsen’s heuristics, resulted in an average rating of 4.62 (on a 5-point scale), indicating high satisfaction regarding navigation clarity, interface design, and perceived usefulness. These findings demonstrate that PsiLink is a feasible, accessible, and privacy-aware solution, providing a solid foundation for future implementations aimed at democratizing access to mental health support.