Building PAKDE: Offline-First Village Co-op Software Powered by Tauri v2 & Gamification

In most 48-hour hackathons, the default instinct is to spin up a Next.js cloud web app or a React Native mobile app. It’s convenient, familiar, and easy to copy-paste.

However, rural village reality doesn’t care about developer convenience.

When building PAKDE (Penguat Administrasi Koperasi Desa Offline-First), we designed for real-world conditions: spotty 3G village connections, low-spec desktop PCs, and complex double-entry SAK EP accounting compliance.

Here is why—and how—we built PAKDE using Tauri v2 (Rust), React 19, SQLite (SQLCipher), and a Duolingo-inspired RPG gamification engine.

🎮 Try the Interactive Quest Engine Demo

Below is an interactive live preview of PAKDE’s Sense of Direction quest hub. In the desktop application, completing daily accounting and legal compliance quests awards XP and levels up the village co-op’s RAG status:

💡 The Anti-Hackathon Trope Philosophy

Why reject traditional Cloud SaaS and Mobile Apps for rural administration?

⚙️ Core Technical Architecture

PAKDE combines high-performance Rust desktop bindings with modern React frontend components:

  ┌─────────────────────────────────────────────────────────────┐
  │                   PAKDE Tauri v2 Desktop                    │
  ├──────────────────────────────┬──────────────────────────────┤
  │    React 19 + TypeScript     │   Rust Backend Engine        │
  │    - Zustand State           │   - SQLCipher (AES-256)      │
  │    - React-Konva Shelf Plan  │   - HMAC Progress Signer     │
  │    - Gamification Quest UI   │   - Zero-Knowledge Sync      │
  └──────────────────────────────┴──────────────────────────────┘

🔒 Cryptographic Progress Signing & Encrypted Database

To prevent local stat-tampering while maintaining zero cloud dependence, PAKDE cryptographically signs local XP and quiz achievements using HMAC-SHA256:

// Rust Backend (Tauri v2) - Securing local progress state
use hmac::{Hmac, Mac};
use sha2::Sha256;

#[tauri::command]
pub fn verify_quest_completion(quest_id: &str, xp_earned: u32, secret_key: &[u8]) -> bool {
    let mut mac = Hmac::<Sha256>::new_from_slice(secret_key).expect("HMAC can take key of any size");
    mac.update(format!("{}:{}", quest_id, xp_earned).as_bytes());
    
    // Validate integrity before updating SAK EP ledger
    mac.verify_slice(&get_saved_signature(quest_id)).is_ok()
}

🇮🇩 Regulatory & Legal Compliance Engine

PAKDE translates complex statutory requirements into straightforward RPG quests:

[!IMPORTANT] UU No. 25/1992 Legal Integration: Every step of cooperative governance—from mandatory initial savings (Simpanan Pokok) to annual member assemblies (RAT) and surplus distribution (SHU)—is enforced as a level requirement.

1. SAK EP Financial Ledger: Full Chart of Accounts (COA) with automated Balance Sheets and Cash Flow statements.
2. Yarnen POS System: Handles cash transactions as well as harvest-credit (Yarnen) receivables ledger.
3. Visual Store Shelf Planner: Built using react-konva for village WASERDA retail layout optimization.

🚀 Get Started with PAKDE

Pre-built native installers are available for Windows and macOS:

• 💾 Download PAKDE for Windows (.exe)
• 🍎 Download PAKDE for macOS (.dmg)
• 💻 GitHub Repository

Written by Okihita • Published on okihita.dev