Secure Backup & Instant Restore System

Secure Backup & Instant Restore System

10 members × 5 months

PM / BA / Developers (Flutter / .NET / Golang) / QC

Requirements Definition / Design / Development / Testing / Deployment / Maintenance & Operations

Frontend

• Flutter（iOS / iPadOS / Android）

• Bloc / Cubit

• PhotoManager

• Native Bridge

Backend

• ASP.NET Core / Golang

• JWT Authentication Middleware

• API Gateway Infrastructure

Infrastructure

• Google Cloud Storage（GCS）

• Cloud Run

• Docker

• GitLab CI/CD

• Clean Architecture (Domain / Data / Presentation)

• Microservices Architecture

• Parallel upload pipeline with pooling and locking control

• Real-time synchronization engine (device / album / account / file deletion events)

• Subscription-based storage capacity control

• Multi-device concurrent access support Development Environments

• Staging / Production

• Implemented approximately 130 functional requirements

• Executed 2,270+ test cases across APP / WEB / Web Admin

• Successfully developed a real-time synchronization engine

• Automatic backup of images, videos, audio, and documents

• Backup and restoration of contacts, calendars, and device settings

• Real-time synchronization across multiple devices

• Multi-platform support (iOS / Android / Web)

• Reduced bottlenecks in video uploads through parallel upload processing

• Automated storage control based on subscription plans

• Centralized license and enterprise management via Web Admin

• Conducted pre-release performance testing (startup time, battery usage, memory consumption)

• Adopted a SaaS subscription-based (license-based) model

• Achieved linear scalability using Cloud Run × GCS

• Established a microservices foundation for future scalability

• Received high customer satisfaction

• Expanded into a long-term engagement

• Gained extensive positive feedback