소집 : SOZIP

An application for Delivery Cost Dutch Pay

'소집(SOZIP) means to gather (people, etc.) in Korean.'

ⓒ 2021 Changjin Ha, Sojung Moon. All rights reserved.

🚀 Tech Stack

Client (iOS)

Backend (BaaS & Serverless)

• Firebase Firestore: Realtime chat and sync SOZIP data
• Firebase Cloud Functions: Process backend business logic for reduce client burden
• Firebase Cloud Messaging: Send push notifications to target user when created new SOZIP and chat

External API

• Naver Maps API (Render location based markers)

🏗️ Architecture

graph TD
    %% Client
    subgraph Client [📱 iOS App]
        UI[UIKit / SwiftUI]
        State[State Management]
    end

    %% Backend & Infra
    subgraph Serverless [☁️ Firebase BaaS]
        Auth[Firebase Auth]
        DB[Firebase Firestore]
        Storage[Firebase Storage]
        Functions[Firebase Cloud Functions]
        FCM[Firebase Cloud Messaging]
    end

    %% External API
    subgraph External [External APIs]
        Map[Naver Maps API]
    end

    %% Data flow
    UI <--> State
    State <--> Auth
    State <--> DB
    State <--> Storage
    State --> Map

    %% Push notifications and BE logic flow
    DB -->|Event Trigger| Functions
    Functions -->|Send Push Request| FCM
    FCM -.->|Push Notification| UI

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🧱 If I were to rebuild it in 2026

Layer	Original	2026 Pick	Reason
UI	Swift UI + UIKit App Delegate	SwiftUI + @main App struct only	AppDelegate is only needed for Firebase setup; FirebaseApp.configure() can move to the App initializer
State Management	ObservableObject + @ObservedObject passed via init	@Observable macro (Swift 5.9) + @Environment	Less boilerplate, no need to pass helpers through every init
Async	Completion handlers	async/await + AsyncStream for Firebase listener	Linear, readable, type safe
Image loading	SDWebImage + SDWebImageSwiftUI	AsyncImage	Remove 2 deps
JSON parsing	SwiftyJSON	Codable	No extra dep, first-party
Credentials storage	UserDefaults (encrypted)	Firebase Auth session persistence only	Don't store credentials at all
Auth state observation	Manual callbacks	Auth.auth().authStateDidChangePublisher() or Asyncstream	Reactive, no polling
Firebase SDK	Pinned to master branch	Pinned to release tag	Build stability
Error handling	String? completion codes ("success", "error")	Result<T, AppError> or throws	Type-safe, exhaustive
Testing	None	XCTest unit tests for Helper layer + Swift Testing framework	Required for financial logic

✨ Core Features

Show Contents

Home

Check any SOZIPs near by you, or notifications

SOZIP Map

Check and contact to all SOZIPs

SOZIP

Check location, participants, or manage your SOZIP in SOZIP Details

Don't you have a favorite SOZIP? Feel free to make it!

Chat

Feel free to talk to the participants

Or you can send any images, bank accounts, or manage your SOZIP. it's so easy.

Profile

Show others your unique personality in your profile

Consulting

Are you experiencing any problems using SOZIP? Feel free to contact us!

Feedback Hub

Improve 소집 : SOZIP with your opinion.