About this role.
Binance is seeking a Client Full-Stack Engineer to build and maintain client-side applications for its instant messaging platform, with Android as the primary focus. The role involves designing core messaging features such as real-time chat, group chat, offline messaging, and push notifications, while leveraging AI-powered tools like Cursor and Copilot to work across iOS and Web codebases. The ideal candidate has solid Android production experience (Kotlin/Java), familiarity with real-time communication protocols (WebSocket/MQTT/gRPC), and a deep understanding of messaging concepts like delivery, sync, and local persistence. This is a remote-friendly, results-driven position within a fast-paced blockchain ecosystem, offering opportunities for career growth and collaboration with world-class talent. The role emphasizes a proactive, ownership-driven mindset and the ability to thrive in a dynamic, autonomous environment.
Role DNA
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Job Complexity
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5/5Autonomy Level
4/5Communication Load
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Core skills
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Cover letter sample
Dear Hiring Team,
I am writing to express my strong interest in the Client Full-Stack Engineer position at Binance, focusing on the IM Chat Platform with Android as the primary platform. With [X] years of production experience in Android development using Kotlin and Java, and a deep understanding of Jetpack components and modern client architecture, I am excited about the opportunity to build scalable and reliable messaging features for a global user base.
My background includes developing real-time chat systems, integrating WebSocket and MQTT protocols, and implementing offline-first experiences with local persistence and push notifications. I am also proficient in leveraging AI-powered tools like Cursor and GitHub Copilot to efficiently read, debug, and modify iOS and Web codebases, enabling me to contribute across platforms and ensure a consistent user experience.
I thrive in fast-paced, autonomous environments and have a strong track record of collaborating with backend teams on API design and production issue resolution. I am particularly drawn to Binance's mission to advance financial freedom and would be honored to contribute my technical skills to a world-class team.
Thank you for considering my application. I look forward to the opportunity to discuss how my experience aligns with the needs of your team.
Sincerely,
[Your Name]
Sample interview questions
In my previous projects, I implemented real-time chat using WebSocket for live updates and REST for fallback. To ensure delivery guarantees, I used message IDs and acknowledgments, with a local outbox for pending messages. For offline sync, I employed a local database with a sync engine that reconciles message state when connectivity is restored, using timestamps and sequence numbers to resolve conflicts.
I start by understanding the architecture and key data flows, then use AI tools like Cursor or Copilot to navigate and generate explanations of specific functions. I write small test changes to validate assumptions, and use logging and debugging tools on both platforms. AI assistants help me translate between languages and identify logical equivalencies, but I always review and test the changes thoroughly.
MQTT is lightweight, supports QoS levels and persistent sessions, making it ideal for unreliable networks and lower battery/power consumption. It also allows pub/sub semantics, which scales well for group messaging. WebSocket is more universally supported and easier to debug, but lacks built-in QoS. For a large-scale platform, MQTT is often preferred for mobile clients, while WebSocket may be used for web clients. I would choose based on the network conditions and scalability requirements.
I profiled an Android app using Android Studio Profiler, identified memory leaks and excessive main-thread work. I implemented lazy loading for list items, optimized image loading using Coil with caching, and replaced repeated calculations with WorkManager for background processing. This reduced startup time by 25% and improved frame rate stability from 45 to 60 FPS. I also reduced network chatter by batching API requests.
I regularly follow Android developer blogs, GitHub repositories, and attend local meetups. I use AI tools daily for code completion, refactoring, and writing unit tests. For example, I use Cursor to generate boilerplate and to explain unfamiliar code, then I verify and customize it. I also experiment with new libraries for KMP or Jetpack Compose. Staying adaptable is key in the rapidly evolving AI landscape.
Responsibilities
- Design, develop, and maintain client-side applications for an instant messaging platform, with Android as the primary focus
- Build core messaging features: real-time chat, group chat, media messaging, message sync, offline messaging, push notifications
- Participate in client-side architecture design, ensuring consistent UX across Android, iOS, and Web
- Use AI-powered tools (Cursor, GitHub Copilot, ChatGPT, Claude, etc.) to support cross-stack frontend development — read, debug, and modify iOS/Web codebases
- Integrate RESTful APIs and WebSocket/MQTT/gRPC real-time communication protocols
- Handle local storage, offline-first experience, message state management, and cross-platform sync logic
- Optimize client performance: startup speed, memory, battery, network efficiency, UI responsiveness
- Collaborate with backend teams on API design, integration, and production issue investigation
- Senior level: mentor junior engineers, contribute to technical design decisions
Requirements
- 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
Preferred 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
Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›
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