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Client Full-Stack Engineer — IM Chat Platform, Android Focus
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
What does a full stack developer in web3 do?
A full stack web3 developer is a developer who has expertise in the full stack of technologies that are used to build web3 applications
These applications use the decentralized, distributed nature of the web3 network to provide users with a secure and decentralized way of accessing and interacting with online services and applications. The responsibilities of a full stack web3 developer will vary depending on the specific project and the needs of the team they are working with
In general, though, a full stack web3 developer will be responsible for: designing and building the front-end and back-end of web3 applications, as well as implementing and maintaining the underlying blockchain infrastructure
This will often involve working with a variety of different technologies and programming languages, such as Solidity for smart contract development, JavaScript and HTML for front-end development, and various blockchain protocols and frameworks. Additionally, a full stack web3 developer may also be responsible for working with the web3 community to help drive adoption and integration of web3 technologies, as well as staying up-to-date on the latest developments in the field and contributing to the broader web3 ecosystem.