tradingforexrisk managementfintechKotlinSwiftin-app purchasesmobile appFintechTrading Tools
STINU Position Size Calculator
Android & iOS
Google Play + App Store100K+ installs4.8★
About
Position sizing calculator for forex and multi-asset trading with pip precision, contract presets, and live risk views.
Problem
Traders need clear timing, disciplined execution, and fast access to utility tools directly on mobile.
Solution
Implemented native Android and iOS features with platform-specific UI, backend integration, and maintainable release processes.
Outcome
Production release completed across Google Play + App Store. 100K+ installs · 4.8★ rating.
My Role
Delivered calculation engine, tutorial flows, localization, and subscription-ready monetization across both platforms.
Core Capabilities
- Pip-accurate risk and lot-size calculations
- Asset presets for forex, metals, indices, and crypto
- Real-time risk/position comparison
- Saved configurations and guided tutorials
- Localized UX and retention flows
Architecture
- Android navigation + chart modules + remote config
- LiveData/Flow-driven UI updates
- iOS SwiftUI + Combine calculation pipelines
- StoreKit 2 + billing infrastructure
Tech Stack
KotlinJetpack NavigationMPAndroidChartFirebase Remote ConfigFirebase MessagingBillingClientSwiftSwiftUICombineStoreKit 2