• Architecting v2 API redesign for Fastify-based microservice with improved endpoint structure and error handling across MongoDB transactions

• Implemented database indexing strategies and query optimization for high-traffic endpoints

• Executing zero-downtime migrations to restructure database schemas while maintaining backward compatibility

• Built automated medication reminder system using GCP Cloud Tasks for scheduled push notifications via APNs

• Implemented queue-based notification architecture with retry logic for failed deliveries and scheduling edge cases

• Established CI/CD pipeline using GitHub Actions for automated admin panel deployment

• Refactored legacy codebase following clean code principles across NestJS monorepo (Nx workspace)

• Optimized MongoDB aggregation pipelines for improved query performance

• Led backend development for Chrome extension serving 1,000+ active users, architecting TypeScript + React monorepo using Microsoft Rush

• Implemented production monitoring and on-call system using GCP logging for debugging and incident response

• Built scalable backend infrastructure on GCP + MongoDB supporting real-time load filtering and AI integration for logistics workflows

• Established error tracking and alerting system for production stability

• Applied structured decision-making frameworks to technical design and code reviews

TedbookCRM (Full System Architecture):

• Architected and built complete CRM backend from scratch using Express.js + TypeScript + MongoDB, supporting web and mobile platforms

• Designed role-based system serving operators, logistics managers, warehouse staff, and couriers with real-time Socket.io updates

• Implemented Firebase Cloud Messaging for push notifications to courier mobile apps

• Currently processing 50+ daily orders across distributed team of 10+ users with total transaction volume approaching 600 orders

• Built admin analytics dashboard providing real-time statistics with daily/weekly/monthly reporting capabilities

WiFi Captive Portal (Yaponama):

• Developed high-throughput authentication system handling 1,000+ daily user registrations across 14 branch locations

• Implemented OTP-based SMS verification integrated with Unifi controller for seamless network access provisioning

• Built using MySQL + Sequelize ORM + TypeScript ensuring data consistency and transaction safety

• Deployed production-ready system with automated user provisioning reducing manual configuration overhead to zero

VoIP Integration System:

• Built Node.js middleware connecting Asterisk phone systems with custom call queue management interface

• Implemented real-time call monitoring features including spy mode, pause controls, and intelligent call routing

• Delivered operator dashboard displaying live incoming/outgoing call information with sub-second latency

Chatwoot Customization:

• Refactored authentication system and optimized media handling (images/videos) for client deployment

• Fixed critical copy-paste bugs and implemented file upload restrictions improving system stability

• Enhanced third-party integrations and resolved production errors affecting user experience

• Rebuilt high-traffic Telegram bot using PHP/Laravel + Nutgram framework for improved performance

• Currently serving 60+ concurrent users processing 300+ daily requests across multiple user groups

• Architected modular bot structure enabling rapid feature deployment and external bot integration

• Contributed to CRM/BPM systems development using Odoo and Jira platforms

• Redesigned and modernized the user interface of an e-commerce platform, improving the overall customer experience