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Runway Calculator: High-Level Application Introduction & Executive Summary

📌 Introduction​

The Runway Calculator is a next-generation financial modeling and scenario analysis tool designed for SaaS startups, businesses, and investors to project their financial runway based on cash flow, revenue streams, expenses, funding events, and debt obligations. By leveraging WASM, Rust, Yew, and a serverless architecture, the application ensures high-performance financial calculations directly in the browser while maintaining scalability, low-latency interactions, and secure data storage.

This application enables users to create, modify, and compare financial scenarios in real-time, helping businesses optimize their financial strategy. The system also integrates with IndexedDB for local session storage and ArangoDB for cloud-based scenario persistence.

🚀 Executive Summary​

📍 Design Focus​

The Runway Calculator is architected with a focus on:
✅ Performance → WebAssembly (WASM) for near-native speed financial calculations.
✅ Scalability → Serverless design for dynamic resource scaling.
✅ Portability → Runs directly in the browser with Yew (Rust-based UI framework).
✅ Security → Data stored securely in ArangoDB with Role-Based Access Control (RBAC).
✅ Resilience → IndexedDB for offline storage, ArangoDB for persistent cloud data.

📍 Key Features​

1️⃣ Real-Time Runway Calculation → Estimates cash depletion timeline dynamically.
2️⃣ Multiple Financial Scenario Management → Compare different cash flow models.
3️⃣ Loan & Funding Event Modeling → Account for investments, debt, interest, and repayments.
4️⃣ WASM-Powered Browser Execution → High-performance execution in a secure sandboxed environment.
5️⃣ ArangoDB Cloud Storage → Persist financial models across devices.
6️⃣ IndexedDB Offline Mode → Work offline and sync when reconnected.
7️⃣ Intelligent Insights & Forecasting → AI-driven cost optimization and revenue projection.
8️⃣ Role-Based Access Control (RBAC) → Secure data access based on user roles.

🌍 Architecture & Design Choices​

1️⃣ Frontend: WASM + Rust + Yew (Browser-Based UI)​

The application uses Rust + Yew + WebAssembly (WASM) to deliver a highly interactive, low-latency financial modeling tool.

✅ Why Yew?

  • A Rust-based UI framework that compiles to WebAssembly, ensuring speed, safety, and memory efficiency.
  • Component-based structure similar to React but with Rust’s memory safety and performance benefits.
  • Eliminates JavaScript runtime overhead.

✅ Why WASM?

  • Native-like performance → Complex financial computations without bottlenecks.
  • Memory-safe execution → Prevents data corruption or security vulnerabilities.
  • Lightweight & portable → Runs directly in the browser without installing dependencies.

✅ IndexedDB for Local Storage

  • Stores user scenarios in the browser for instant access.
  • Data syncs to ArangoDB only when "Save" is clicked to reduce API calls.

2️⃣ Backend: Serverless + ArangoDB Cloud​

This application follows a serverless architecture, where ArangoDB handles cloud-based scenario storage and RBAC.

✅ Why ArangoDB?

  • Multi-model NoSQL database → Supports graphs, documents, and key-value storage in one system.
  • Ideal for financial scenario versioning → Each model can be stored as a snapshot for comparisons.
  • GraphDB capabilities → Enables intelligent linking of revenue streams, costs, and funding events.

✅ Serverless Execution Model

  • Financial calculations run in the browser (WASM) → No backend compute costs.
  • API calls are minimal → Only necessary for persisting scenarios.
  • GCP Cloud Functions handle scheduled tasks (e.g., auto-updating scenarios with real-time market data).

3️⃣ Security: RBAC & Encrypted Cloud Storage​

✅ Role-Based Access Control (RBAC)

  • Admin, Analyst, Viewer roles
  • Only authorized users can modify financial scenarios

✅ Cloud Data Encryption

  • ArangoDB stores financial data with per-user encryption keys
  • Logs and audit trails ensure transparency and compliance

✅ Login & Authentication (Future Phase)

  • OAuth2 / SSO integration planned for user management

🌟 Why This Approach?​

✅ Ultra-fast performance with Rust + WASM → No need for backend computations.
✅ Scalability with serverless architecture → Low-cost, high-availability system.
✅ User-friendly UI with Yew → A Rust-native alternative to React for seamless interactivity.
✅ Resilient storage system → IndexedDB for local work, ArangoDB for cloud sync.
✅ Future-proof & extendable → AI-powered insights and automation features planned.

📌 Summary: What This Application Delivers​

The Runway Calculator is designed to be lightweight, fast, and scalable, giving users the ability to:
✔️ Create multiple financial scenarios
✔️ Simulate revenue, expenses, funding, and loan repayments
✔️ Estimate financial runway with accurate burn rate calculations
✔️ Work offline with IndexedDB and sync securely to ArangoDB Cloud
✔️ Leverage AI-driven cost & revenue optimizations (future phase)

📌 Next Steps​

🚀 Do you agree with this structure?
💡 Would you like additional refinements before coding the next phase?

Once confirmed, we will proceed with:
1️⃣ Finalizing IndexedDB-ArangoDB integration
2️⃣ Expanding financial formulas & runway visualization
3️⃣ Enhancing UI for better user experience

Let me know if anything needs adjustment! 🔥