Sadok.app — development mobile CRM

Sadok.app is the first Ukrainian mobile CRM application for kindergartens, development centers and clubs.
Client Sadok.app
Description Sadok.app is the first Ukrainian mobile CRM application for kindergartens, development centers and clubs. The platform provides a complete interaction cycle between preschool institutions and parents: from children’s profiles to automated payments and reports. Developed with focus on convenience, European-standard data security and monetization of additional services for facilities.
Task and realisation
Preschool institutions faced critical problems: fragmented communication with parents via SMS, Viber and paper schedules, manual payment processing for basic services and clubs, lack of centralized attendance analytics and difficulties with service personalization. It was necessary to create a unified mobile ecosystem for Android/iOS with three access levels (parents, staff, administrators), payment system integration, group chats and reports to standardize processes and increase conversion of additional services.
What was done:
Developed modular architecture based on “Information + Services + Management” formula: created child profiles with development cards, attendance calendars with automatic timesheets, group and personal chats, photo/video galleries with smart distribution, automated payment processing for clubs and partner marketing for monetization. Ensured data encryption according to European standards, fast facility onboarding in 1 business day and 30-minute staff training via video tutorials. Interface adapted for mobile devices with personalization and flexible access roles. Developed two modules: “Info” (basic functionality) and “Service+” (extended with finances).
Website
sadok.app
Result
Platform development and launch took 4 months. Payment and timesheet automation reduced manual administrator work by 80%, increasing conversion of additional services (clubs, meals) by 45%. Implemented 14-day free demo access and unlimited “Info” module for first month, ensuring fast adoption in public and private kindergartens. Parent engagement grew 70% thanks to push notifications, chats and calendars. Data security and archiving comply with GDPR-like standards. Platform scales from small clubs (10 children) to large facilities (200+ children).
Flutter (cross-platform development, native iOS/Android interface from single codebase, high performance). Node.js/Express backend with PostgreSQL database for fast query processing and dynamic filtering. REST API for cross-platform data synchronization. Firebase Cloud Messaging for push notifications about news, events and payments. Data encryption to protect children’s and parents’ personal information. Payment system integration (LiqPay, Fondy, Portmone). Cloud infrastructure with European servers for data security. Automatic backup and data export to CSV/Excel. Adaptive UI/UX design with dark and light themes. Role-based access control (RBAC) for parents, educators and administrators.