Client Full-Stack Engineer — IM Chat Platform, Android Focus

Binance; Hong Kong; Remote; HKD 420,000 - 720,000; Full time

Benefits offered by this job

Remote-first policy

Competitive salary

Learning opportunities

Job summary

Binance in Hong Kong is hiring an Android Engineer to design, develop, and maintain client-side apps for our instant messaging platform, with Kotlin/Java on Android as the focus. You will collaborate across Android, iOS, and Web to ensure a unified UX and scalable architecture.

You’ll use AI-powered tools to accelerate front-end work, integrate RESTful and real-time protocols, optimize performance, and mentor junior engineers.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or a related discipline.
• 1-3+ years of experience for Engineer; 3-5+ years for Senior Engineer.
• Solid production experience in Android development (Kotlin and/or Java).
• Strong understanding of Android SDK, Jetpack components, async programming, and modern client-side architecture.
• Ability to use AI-powered development tools for cross-stack frontend development.
• Able to read, understand, debug, and modify iOS or Web codebases with AI support.
• Familiarity with WebSocket, MQTT, gRPC, or similar real-time protocols.
• Understanding of messaging concepts: delivery, read status, sync, offline support, push notifications.
• Knowledge of client-side performance optimization, memory management, multithreading, and security.
• Familiar with Git, CI/CD, automated testing, and Agile processes.
• Strong debugging, problem-solving, ownership, and communication skills.

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 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

Skills

Android development

Kotlin/Java

AI tooling

Real-time protocols

Git/CICD

Multithreading

Security best practices

Education

Bachelor's degree in CS/Software Eng

Tools

Android Studio

Git

CI/CD pipelines

Job description

Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries for our industry-leading security, user fund transparency, trading engine speed, deep liquidity, and an unmatched portfolio of digital-asset products. Binance offerings range from trading and finance to education, research, payments, institutional services, and more. Our mission is to increase the freedom of money and financial access for people around the world.

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

Why Binance

• Shape the future of finance
• Collaborate with world-class talent in a user-centric global organization with a flat structure
• Tackle challenging projects in a fast-paced and innovative enviornment with autonomy
• Thrive in a results-driven workplace with opportunities for career growth and continuous learning
• Competitive salary and company benefits
• Remote-first, work-from-home arrangement (may vary depending on the nature of the role and team)

Binance is committed to being an equal opportunity employer. We believe that having a diverse workforce is fundamental to our success.

By submitting a job application, you acknowledge that you have read our Candidate Privacy Notice.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.