Project Name (Title) Comprehensive Online Appointment System Development for Psychological Clinic (Mobile & Web) Project Description (Full Text) Introduction and Project Summary: We are seeking an experienced freelancer or team to develop a full-fledged online appointment booking system for a psychological counseling clinic. The project requires both a mobile application that functions flawlessly on iOS and Android devices, and a user-friendly web interface. Requirements and Core Features (Admin/Specialist Panel): Advanced Administrator (Admin) Accounts and Authorization Hierarchy: Initially, three (3) admin accounts must be established, and this number must be easily scalable in the future. Super Administrator (Clinic Owner) Account: Will have the authority to view all current and active calendars simultaneously. Furthermore, the Super Admin will have full authority to remove, delete, or add new admin accounts (specialists/psychologists). Specialist (Psychologist) Accounts: Each specialist will only be able to view and manage their own specific calendar. Google Calendar-Like Functionality: The appointment calendar and interface must strictly follow the logic and user experience (UX) of Google Calendar in terms of operation and workflow. Specialist-Specific Color Coding: Each specialist/psychologist must have their own assigned color for easy distinction within the calendar. Flexible Working Hours Management: Via the admin panel, each specialist must be able to flexibly block off non-working time slots for every single day. These "unavailable" slots must not be selectable or visible to clients. Requirements and Core Features (End-User/Client): Client Registration and Specialist Assignment (CRM Feature): End-users will register on the system after downloading the application. Registered clients must be assigned to a specialist (psychologist) by the admin accounts. Once assigned, the client will only be able to view the calendar of their dedicated specialist and book appointments with them. Communication and Automated Notification System (SMS & WhatsApp Integration): Reliable SMS integration and WhatsApp Business API integration linked to the company's phone number are mandatory for stable project operation. Appointment Confirmation/Information: Immediately after an appointment is booked, an automated message containing the appointment details must be sent to the client via both SMS and WhatsApp. Appointment Reminder: A reminder message for the appointment must be automatically sent to the client exactly 24 hours prior to the scheduled date and time via both SMS and WhatsApp. Language Support (Multilingual): The application and web interface must be prepared with both Turkish and English language options. Turkish must be set as the default language. Note: Turkish translations for the English texts used within the program will be provided by us to the developer (provided that the English texts are delivered to us as a Word file and translation support is requested). Technical Expectations: Mobile application (Native or Cross-Platform, please specify your preferred technology). Reliable, fast, and scalable backend infrastructure. Bug-free and stable performance. In Your Proposal, Please Include: The technology stack you plan to use for both mobile and web development, and your experience with similar integrations. Your previous experience with developing corporate/appointment booking systems. Your proposed Fixed Price or Hourly Rate and estimated timeline for completion.