Sylex Assistant Pro
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Mobile AI Product Case Study

Sylex Assistant Pro

Sylex Assistant Pro is a production-oriented multilingual voice AI mobile app for iOS and Android. Built with React Native and TypeScript around controlled AI workflows, localization, request/session handling, and app-store-ready product polish. Available on Apple App Store and Google Play.

React Native TypeScript Voice AI i18next Apple App Store Google Play

1) Problem and Context

Why this project mattered
  • The legacy client had growing complexity and slower iteration speed for voice-first features.
  • Product requirements demanded stable multilingual support and clear voice-state UX across platforms.
  • The app needed stronger release-readiness for store distribution on both iOS and Android.

2) Solution Implemented

What was built

Mobile Architecture

Designed and built the React Native application in TypeScript with a clean modular structure, native platform integration, and maintainable voice-state management.

Voice Orchestration

Built controlled voice-AI interaction flows with clear state transitions, request/session handling, resilient error handling, and user-facing feedback.

UI/UX Design and Localization

Designed the full mobile UI/UX including voice-state flows, error states, and interaction feedback. Implemented automatic device-language detection and multilingual support for a broader app audience.

Safety and Reliability

Designed request/session guardrails, clear interaction boundaries, and failure-safe messaging to support product stability.

3) Technology Stack

Core tools
React Native TypeScript React Navigation i18next / react-i18next Jest Voice AI integration Controlled AI workflows Mobile release quality UI/UX Design

4) Impact and Outcomes

Production outcomes

Store Delivery

Shipped and maintained release-ready builds for Apple App Store and Google Play.

Maintainability

Improved code organization and developer workflow through a typed, modular React Native codebase.

User Experience

Delivered more consistent multilingual and voice-state behavior with clearer runtime feedback.

5) Challenges and Lessons

Engineering takeaways
  • Voice apps require strict state design to avoid race conditions across interaction phases.
  • Multilingual apps benefit from centralized translation keys and explicit fallback handling early in development.
  • Release success on mobile stores depends as much on build/release discipline as on core feature implementation.