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Cordex Intelligence Limited

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Senior Web Developer

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Summary

Senior full-stack web developer in Tai Kok Tsui, Hong Kong, who designs, builds, and maintains scalable web applications and real-time microservices. Day to day spans React frontends, Java Spring Boot/Node.js/Python/PHP backends, WebSocket real-time features, plus AWS cloud, server, and deployment management.

About the role

End-to-end full-stack web development role involving design, build, and maintenance of scalable, robust web applications and real-time microservices. You will develop modern interactive user interfaces, manage cloud infrastructure, and lead technical initiatives across the stack.

Key responsibilities

  • End-to-End Web Development: Design, build, and maintain scalable, robust full-stack web applications and real-time microservices using Java Spring Boot, Node.js, Python, PHP, and React.

  • Frontend & Real-Time Engineering: Develop modern interactive user interfaces with React/JavaScript and implement real-time bidirectional communication features.

  • Infrastructure & Cloud Operations: Manage Cloud infrastructure on AWS, perform server configurations, deploy environments, and manage domain/SSL security certificates.

  • System & Environment Management: Setup, configure, and maintain virtual machines/devices, web servers (e.g., Nginx, Apache), and staging/production deployment pipelines.

  • System Integration & Database Operations: Integrate backend services via RESTful APIs, WebSockets/Socket.IO, and manage relational database schemas and queries.

  • Security & Performance: Implement web application security practices (e.g., HTTPS/SSL, CORS, access control) and optimize application performance and response times.

Requirements

  • Higher Diploma or Degree or above in Computer Science, Information Technology, or related disciplines.

  • Minimum 5 years of professional experience in full-stack web application development.

  • Strong proficiency in Backend & Real-Time Technologies:

  • Solid experience in Java (Spring Boot), alongside experience with Node.js, Python (e.g., Django / Flask), and/or PHP.

  • Hands-on experience in real-time event-driven architecture using WebSocket and Socket.IO.

  • Strong proficiency in Frontend Technologies: Hands-on experience in React, modern JavaScript (ES6+), and HTML5/CSS3.

  • Hands-on Cloud & Server Management: Practical experience with AWS services (e.g., EC2, S3, RDS, IAM) and Linux server administration.

  • DevOps & Security Setup: Proficient in installing and configuring SSL/TLS certificates, Web Servers (Nginx/Apache), and virtual device / VM environments.

  • Solid understanding of relational databases (e.g., MySQL, PostgreSQL, or MSSQL) and API design (RESTful APIs / JSON).

  • Strong analytical, problem-solving, and troubleshooting skills across both software, real-time networking, and infrastructure layers.

  • Self-motivated team player with a strong sense of ownership and responsibility.

Nice to Have

  • Experience in Unity 3D development or integrating Web-to-Unity interactive systems.

  • Experience with containerization technologies (Docker) and CI/CD pipelines (e.g., GitHub Actions, Jenkins).

  • Basic knowledge of Web Application Security standards (OWASP) and vulnerability scanning.


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