Open to opportunities

Илья Филонов

@0004213

Message

I build React and React Native apps for banking, industrial, and creative products.

Spain

Message

I've built web and mobile products for Optim System Bank, Sibdev, and ITEO LLC, including iOS and Android banking apps, oil and gas services, and creative-industry mobile applications. My work spans app architecture, proprietary API integrations, notifications, store publishing, complex forms, WebSocket chats, and low-bandwidth frontend optimization.

I'm hands-on with React, React Native, TypeScript, MobX, Redux, Expo, and Swift. I also build commercial personal projects, including the #ColorBit iOS app with camera streaming, offline caching, sharing, and App Store subscription functionality.

Experience

Work history, roles, and key accomplishments

Current

Mobile App Developer

Current

Personal Project

May 2025 - Present (1 year 3 months)

Developed an iOS mobile app in Swift, working with camera streaming, positioning, and sharing features. Implemented offline mode with local data caching and paid functionality, passing AppStore moderation for subscriptions.

Swift iOS Positioning Offline In App Purchases app store

Current

Lead Frontend Developer

Current

Optim System Bank LTD

Sep 2024 - Present (1 year 11 months)

Developed architecture and interfaces for iOS and Android mobile applications. Worked with proprietary banking APIs, integrated notifications, published apps to stores, and mentored another developer.

React Native iOS Android Bank APIs Notifications App Store Publishing Mentor

Frontend Developer

Sibdev

Aug 2023 - Sep 2024 (1 year 1 month)

Developed service architecture for oil and gas industry products using MobX. Implemented data handling via custom APIs, localized UI in three languages, built interfaces with AntDesign and MUI, optimized for low bandwidth, and configured PWA apps via CapacitorJS.

MobX TypeScript Ant Design PWA Localization API Integration Performance Optimization

React Developer

ITEO LLC

Jul 2021 - Aug 2023 (2 years 1 month)

Developed architecture and interfaces for mobile applications in creative industries. Configured media players, authentication, banking API integration, notifications, and published apps. Built complex forms and WebSocket chats for an international forum website, and implemented mapping with 2GIS API.

React Native WebSockets Authentication Media Players Notifications App Store Publishing