Senior Software Engineer (Front-End) - React

Job description

We are looking for Software Engineers and Senior Software Engineers to join our team in building the desktop and web interfaces for our End-to-End Encrypted (E2EE) Messaging Platform. You will be part of a mission to create a communication tool that is not only highly secure but also incredibly fast and visually stunning. This is a unique opportunity to solve fascinating challenges at the intersection of cryptography, multi-modal real-time data (audio, video, and group calls), and a premium user experience. 

Key responsibilities

• Feature Development: Directly implement and maintain pixel-perfect, responsive UI components using React and TypeScript, ensuring a high-fidelity and “butter-smooth” user experience. 
• State Management: Execute complex application state logic using Redux and handle asynchronous side effects with Thunk to ensure predictable data flows. 
• Performance Mastery (Senior Only): Deeply optimize the Critical Rendering Path (Layout, Paint, Composite) and manage the execution of high-frequency real-time data to prevent UI jank. 
• Data & State Orchestration (Senior Only): Design and implement scalable Redux state containers and comprehensive data management strategies using Local DB, ensuring seamless data synchronization and integrity. 
• Comprehensive Data Management: Work with local storage and databases (e.g., IndexedDB) to manage complex data structures, ensuring robust “offline-ready” functionality. 
• Real-Time Conversations: Implement and optimize WebSocket connections to deliver sub-second latency for messages, audio/video calls, and real-time group interactions. 
• Build Infrastructure (Senior Only): Customize and optimize the build pipeline (Vite, Webpack). Manage bundle efficiency, environment configurations, and the transpilation layer (e.g., Babel). 
• Desktop Integration: Develop the desktop application environment using Electron, utilizing Node.js APIs and IPC patterns to bridge web code with native OS features. 
• System Integration & Security (Senior Only): Master the Electron IPC bridge and Node.js integration, ensuring the desktop app is hardened against vulnerabilities. 
• Diagnostics & Root Cause Analysis (Senior Only): Act as a technical anchor, leveraging deep knowledge of V8 internals to analyze memory leaks, profile performance, and solve complex race conditions. 
• Code Quality & Excellence: Write clean, modular, and testable code. For Senior candidates, this includes leading rigorous code reviews and championing SOLID principles. 

Qualifications

• Education: Bachelor's degree in Computer Science, Engineering, or a related field. 
• Professional Experience: 3+ years for Software Engineer / 5+ years for Senior Software Engineer with substantive engineering experience. 
• Core Tech Stack: Deep proficiency in ReactJS, TypeScript, and Redux (Async/Thunk). 
• Advanced Styling: Proficiency in modern styling approaches (CSS-in-JS, CSS Modules, Sass/Less) and experience working with or implementing UI Design Systems. 
• Browser Fundamentals: Strong understanding of how browsers render content (DOM, Paint) and handle complex network requests. 
• Runtime & API Deep-Dive (Senior Only): Deeply understand how the Browser and Node.js execute code (Event Loop, Microtasks, Memory Management) to ensure maximum efficiency. 
• Data Management Mindset: Understanding of data modeling and local-first patterns. Senior Only: Proven ability to architect complex data persistence strategies. 
• Engineering Mindset: A proactive learner with the ability to quickly adopt new technologies and follow internal best practices (SOLID, DRY). 
• Problem Solving: Exceptional analytical skills to troubleshoot complex UI/UX bugs and investigate deep-seated architectural bottlenecks. 

Nice to have: 

• Domain Expertise: Previous experience in developing messaging platforms or working with the XMPP protocol. 
• Open Source Contribution: Active contributions to reputable open-source projects or community-driven technical initiatives. 
• Advanced Performance: Experience with Web Workers, Service Workers, or WebRTC for specialized processing. 
• Build Tools & Transpilation: Understanding of the transpilation process and tools like Babel to ensure cross-platform compatibility. 
• Modern Tooling (Senior Only): Proficiency in WebAssembly (Wasm) for high-performance cryptographic operations. 
• Excellent problem-solving and analytical abilities. 
• Good communication and collaboration skills. 
• Passion for building high-quality, user-centric web applications. 
• Fluency in English; Vietnamese proficiency is a plus.