▹ Led the backend architecture and system design of a real-time geolocation app

▹ Implemented international date/time handling to support multi-timezone usage

▹ Integrated partially-filled form handling with auto-save functionality

▹ Refactored service layer for improved scalability and maintainability

▹ Reduced API response time by 40% through advanced query optimization

▹ Improved error-handling strategy across frontend and backend layers

▹ Managed VPS performance and stability through optimized server configuration

▹ Developed category/time/location-based search filters with high precision

▹ Containerized services using Docker for consistent deployment pipelines

▹ Built and maintained RESTful APIs for internal and external applications

▹ Refactored MySQL schemas and queries for better normalization and speed

▹ Contributed to frontend components using React and context-based state management

▹ Handled infrastructure logic for OLTs, ONUs, and NAPs device management

▹ Led the migration and restructuring of legacy database models

▹ Participated in architectural reviews and DevOps process improvements

▹ Designed and developed a desktop app for managing short-term rental properties

▹ Implemented booking flow, customer records, and availability calendar

▹ Built a financial dashboard with automatic invoice generation

▹ Planned and tested a one-time purchase licensing model

▹ Developed microservices and APIs using Spring Boot with Clean Architecture principles

▹ Implemented JWT-based authentication and role-based access control

▹ Improved system performance by optimizing SQL queries and indexes

▹ Collaborated with frontend and QA teams in an agile delivery environment