Flutter Front-End Developer

MOBIUS ONE Pte Ltd; Singapore; On-site; SGD 70,000 - 90,000; Full time

Job summary

A leading tech company in Singapore is seeking a Flutter Front-End Developer to build a multi-user voice chat app. This role requires expertise in Flutter and WebRTC, focusing on delivering cross-platform functionalities for iOS and Android. Candidates should have at least 2 years of experience in Flutter development and familiarity with real-time communication technologies. Competitive salary and benefits offered.

Qualifications

• 2+ years of experience in Flutter development.
• Deep understanding of Flutter framework principles.
• Experience with audio/video development and SDK integration.
• Proficient with Platform Channels and native plugins development.
• Familiar with socket programming using WebSocket.

Responsibilities

• Develop the Flutter client for a multi-user voice chat app.
• Implement complex voice room UIs and real-time state synchronization.
• Optimize app performance for low CPU and memory usage.
• Collaborate with backend developers on interactive features.

Skills

Flutter development

Dart language

WebRTC SDK integration

Real-time communication

Audio/video integration

Performance optimization

Tools

Agora Flutter SDK

WebRTC

Hive

sqflite

Job description

Flutter Front-End Developer – Multi-User Voice Chat App

Job Responsibilities

• Develop the Flutter client for a multi-user voice chat app, delivering cross‑platform features for iOS and Android.
• Implement complex voice room UIs, including mic management, real‑time state synchronization, and visual effects.
• Integrate WebRTC SDK to handle audio stream capture, encoding, and transmission.
• Optimize app performance to ensure a smooth in‑room experience with low CPU and memory usage.
• Implement instant messaging (IM) features such as in‑room text chat, bullet comments, and system messages.
• Collaborate with backend developers to deliver interactive features like gift animations, level displays, and user interactions.

Requirements

• 2+ years of experience in Flutter development, proficient in Dart language.
• Deep understanding of Flutter framework principles, including Widget tree, rendering process, and state management (Provider / Riverpod / GetX).
• Experience with audio/video development and integration of SDKs like WebRTC, Agora, or Tencent Cloud TRTC.
• Proficient with Platform Channels and capable of writing native plugins for audio‑related functionalities.
• Familiar with socket programming and real‑time communication using WebSocket or Socket.io.
• Strong coding standards, with familiarity in Flutter performance optimization and memory management.

Technical Stack

State Management: Riverpod 2.0+ or Bloc

Local Storage: Hive or sqflite

Audio/Video SDK: Agora Flutter SDK or WebRTC

Instant Messaging: RongCloud / EaseMob Flutter SDK or custom WebSocket solution

Preferred Qualifications

• Experience in developing live streaming, voice chat room, or video conferencing apps.
• Knowledge of audio processing techniques such as noise reduction, echo cancellation, and 3D spatial sound effects.
• Skilled in creating advanced animations (Lottie, Rive, or custom animation development).
• Participation in social apps with over 100K daily active users.
• Experience in native iOS/Android development.