Ether Law Office still operates its legal services conventionally, so prospective clients must visit or call for legal information or consultation. This limits service coverage, raises human-error risk in manual record-keeping, and reduces transparency of advocates' profiles and specializations before clients decide to consult. This study aims to design and build a Web-Based Lawyer Service Provider System that makes it easier for prospective clients to obtain legal information and consultation in accordance with applicable Indonesian regulations. The system was developed using the Waterfall method, covering requirements analysis, system design using Unified Modeling Language (UML), implementation with the Laravel framework based on Model-View-Controller (MVC) architecture and a MySQL database, and testing using the Black Box Testing method. The system has three user roles, namely Prospective Client, Advocate/Lawyer, and Admin, with features including registration and login, a company profile, advocate profiles and specializations, advocate search and filtering, legal consultation via chat, schedule management, and invoice issuance and monitoring. Black Box Testing on 15 test scenarios shows a 100% success rate, with all system functions running as required. Thus, this system is expected to improve access to legal services and benefit both prospective clients and advocates at Ether Law Office. This study provides a practical contribution in the form of a legal-service digitalization prototype that can serve as a reference for similar law offices to improve service efficiency and transparency