Nasrulla Unais

Multi-tenant booking system enabling real-time reservation of sports arenas with optimistic locking to prevent double-booking.

• Architected multi-tenant booking system for real-time sports arena reservations
• Implemented optimistic locking to prevent double-booking concurrency issues
• Integrated PayHere IPG for secure payment processing with webhook reconciliation
• Designed normalized PostgreSQL schema for venue availability, pricing tiers, and user roles

Production Android app with 14+ releases, Material Design 3 migration, and background scheduling using WorkManager.

• Spearheaded modernization of open-source Android app, migrating legacy UI to Material Design 3 and Jetpack Compose across 14+ production releases
• Engineered background scheduling system using WorkManager and Sensor Fusion (Compass/GPS) for improved prayer time accuracy
• Developed and integrated 4 interactive Home Screen Widgets using Jetpack Glance, increasing user retention and daily engagement

Cross-platform communication mediator addressing code-mixed dialects (Singlish/Tanglish) with LLM-powered intent processing.

• Developed cross-platform communication mediator addressing code-mixed dialects (Singlish/Tanglish) by integrating LLMs to process intent and map outputs to formal text
• Engineered bidirectional real-time chat infrastructure using WebSockets, implementing local message queuing to maintain data integrity during offline client states
• Built media processing pipelines to handle voice note compression and document OCR extraction, passing sanitized inputs to the translation engine