Java Software Engineer (Mid/Senior)

Zalo OA is the official account of a business on the Zalo platform. It provides a solution that helps hundreds of thousands of businesses connect and interact with over 75 million Zalo users.

What you will do

• Feature Implementation: Build and deploy user-facing features across the full stack (Frontend to Backend) for Zalo Official Account;
• API Development: Develop and maintain robust RESTful APIs to support client-side logic;
• Frontend Integration: Implement responsive UI components using modern frameworks (ReactJS/VueJS), ensuring high performance across devices;
• Optimization: Troubleshoot bugs, optimize database queries, and improve application performance/latency;
• Collaboration: Work closely with the Senior team, Product Owners, and QC to ensure product quality and delivery timeline;
• Code Quality: Write clean, readable code and participate in peer code reviews.

What you will need

• Education: Bachelor’s degree in Computer Science, Information Technology, or equivalent.

Backend Skills:

• Proficiency in at least one backend language: Java (Spring Boot), Go, or NodeJS;
• Solid knowledge of RDBMS (MySQL/PostgreSQL) and basic query optimization;
• Experience with Caching (Redis) is a plus.

Frontend Skills:

• Strong skills in JavaScript/TypeScript, HTML5, CSS3/SCSS;
• Practical experience with ReactJS;
• Knowledge of State Management (Redux, Vuex) and asynchronous request handling.

General Skills:

• Good understanding of Data Structures, Algorithms, and OOP principles;
• Experience with Git, Docker, Linux and standard CI/CD workflows;
• Logical thinking and ability to work independently on assigned modules.

Security Awareness:

• Solid understanding of web security best practices, specifically XSS (Cross-site scripting) and CSRF (Cross-Site Request Forgery);

Nice to have

• Experience with High Traffic systems or optimizing page load speed;
• Knowledge of SEO principles (Search Engine Optimization) for Single Page Applications (SPA);
• Knowledge of authentication protocols like OAuth2, JWT.