Client Full-Stack Engineer — IM Chat Platform, Android Focus
On-siteSydney, New South Wales, Australia or Taipei, Taiwan, Taiwan
Job Summary
Design, develop, and maintain client-side applications for an instant messaging platform, with Android as the primary focus. Build core messaging features including real-time chat, group chat, media messaging, message sync, offline messaging, and push notifications. Participate in client-side architecture design to ensure consistent UX across Android, iOS, and Web. Use AI-powered tools to support cross-stack frontend development by reading, debugging, and modifying iOS and Web codebases. Integrate RESTful APIs and real-time communication protocols like WebSocket, MQTT, and gRPC. Optimize client performance for startup speed, memory, battery, and network efficiency. Collaborate with backend teams on API design, integration, and production issue investigation. Mentor junior engineers and contribute to technical design decisions.
Required Qualifications
- Bachelor's degree in Computer Science, Software Engineering, or a related discipline
- Engineer: 1-3+ years of experience; Senior Engineer: 3-5+ years
- Solid production experience in Android development (Kotlin and/or Java)
- Good understanding of Android SDK, Jetpack components, asynchronous programming, and modern client-side architecture
- Required: ability to use AI-powered development tools (Cursor, GitHub Copilot, ChatGPT, Claude, or similar) for cross-stack frontend development
- Able to read, understand, debug, and make reasonable changes in iOS or Web codebases with AI tool support
- Familiarity with WebSocket, MQTT, gRPC, or similar real-time communication protocols
- Understanding of messaging concepts: message delivery, read status, sync, local persistence, offline support, push notifications
- Good understanding of client-side performance optimization, memory management, multithreading, and security best practices
- Familiar with Git, CI/CD pipelines, automated testing, and Agile processes
- Strong debugging, problem-solving, ownership, and communication skills
Desired Qualifications
- Experience building IM products or communication platforms (WhatsApp, Telegram, WeChat, Discord, Slack, Messenger, etc.)
- iOS development experience (Swift, SwiftUI, Objective-C)
- Web frontend experience (TypeScript, React, Vue, Next.js)
- Cross-platform client or mobile full-stack development experience
- End-to-end encryption, message security, or cryptographic protocols experience
- Voice/video calling or RTC technologies experience
- Large-scale distributed messaging infrastructure experience
- Fintech, payments, or Web3 applications experience
- Open-source contributions or published apps on Google Play/App Store
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