About this role
About the Role
We are seeking a Client Full-Stack Engineer focused on Android for an instant messaging platform. You will design, develop, and maintain client-side features with a strong emphasis on Android, collaborate on cross-platform UX, and leverage AI-powered tools to support frontend development across Android, iOS, and Web. What You'll Do
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Design, develop, and maintain client-side applications for an instant messaging platform, with Android as the primary focus
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Build core messaging features: real-time chat, group chat, media messaging, message sync, offline messaging, push notifications
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Participate in client-side architecture design, ensuring consistent UX across Android, iOS, and Web
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Use AI-powered tools (Cursor, GitHub Copilot, ChatGPT, Claude, etc.) to support cross-stack frontend development
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Integrate RESTful APIs and WebSocket/MQTT/gRPC real-time communication protocols
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Handle local storage, offline-first experience, message state management, and cross-platform sync logic
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Optimize client performance: startup speed, memory, battery, network efficiency, UI responsiveness
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Collaborate with backend teams on API design, integration, and production issue investigation
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Senior level: mentor junior engineers, contribute to technical design decisions What We're Looking For
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Bachelor's degree in Computer Science, Software Engineering, or a related discipline
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Engineer: 1-3+ years of experience; Senior Engineer: 3-5+ years
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Solid production experience in Android development (Kotlin and/or Java)
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Good understanding of Android SDK, Jetpack components, asynchronous programming, and modern client-side architecture
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Ability to use AI-powered development tools (Cursor, GitHub Copilot, ChatGPT, Claude, or similar) for cross-stack frontend development
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Able to read, understand, debug, and make reasonable changes in iOS or Web codebases with AI tool support
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Familiarity with WebSocket, MQTT, gRPC, or similar real-time communication protocols
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Understanding of messaging concepts: delivery, read status, sync, local persistence, offline support, push notifications
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Good understanding of client-side performance optimization, memory management, multithreading, and security best practices
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Familiar with Git, CI/CD pipelines, automated testing, and Agile processes
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Strong debugging, problem-solving, ownership, and communication skills Nice to Have
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Experience building IM products or communication platforms (WhatsApp, Telegram, WeChat, Discord, Slack, Messenger, etc.)
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iOS development experience (Swift, SwiftUI, Objective-C)
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Web frontend experience (TypeScript, React, Vue, Next.js)
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Cross-platform client or mobile full-stack development experience
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End-to-end encryption, message security, or cryptographic protocols experience
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Voice/video calling or RTC technologies experience
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Large-scale distributed messaging infrastructure experience
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Fintech, payments, or Web3 applications experience
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Open-source contributions or published apps on Google Play/App Store Compensation & Benefits
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Competitive salary and company benefits
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Work-from-home arrangement (the arrangement may vary depending on the work nature of the business team)