Front-End Developer

About Galaxy Telecom:

Galaxy Telecom is a member company of Galaxy Holdings – a technology group under Sovico Group. We focus on developing next-generation telecommunications products such as SkyFi – a next-generation mobile network, providing physical SIM and eSIM with domestic and international voice and data plans, aiming to deliver a flexible and convenient user experience without borders.

Key Responsibilities:

The Front-End Developer is responsible for designing, developing, testing, optimizing, and maintaining the company’s web applications. The position works closely with the Product Owner, Business Analyst, UI/UX Designer, Back-End Developer, QA/QC, and other stakeholders to transform business requirements into products with high quality, performance, and scalability.

UI and Component Development

• Develop modern, responsive web applications for Desktop and Mobile.
• Build reusable and maintainable components that comply with the project’s Front-End architecture.
• Use and extend the UI Component Library in accordance with the product’s Design System.
• Ensure that screens include appropriate loading states, error states, empty states, and necessary interaction states.
• Ensure that the UI meets basic accessibility and responsive design requirements.

Client-Side State and Data Management

• Manage server state and client state according to their intended purposes, avoiding overuse of global state.
• Build mechanisms for efficient caching, data synchronization, and mutation handling.
• Validate input/output data at application boundaries when necessary.
• Handle API responses, error handling, pagination, filtering, sorting, and Front-End data-related business logic.
• Support export/download file functions from APIs such as Excel, CSV, or other appropriate formats.

Routing, Authentication, and Authorization

• Build and extend routing for the application.
• Implement lazy loading, code splitting, and route-level error handling.
• Integrate authentication and authorization according to the system’s mechanisms.
• Implement route guards and control access permissions based on user roles/permissions.

API and Back-End System Integration

• Integrate REST APIs or other API protocols appropriate to the system.
• Coordinate with Back-End Developers to align on API Contracts and handle API changes.
• Handle timeouts, retries, error responses, and abnormal situations during communication with the Back-End.
• Ensure that data displayed on the UI is accurate and consistent with business requirements.

Testing and Quality Assurance

• Write unit tests and component tests for critical functionalities.
• Perform type checking, linting, testing, and building before creating a Pull Request/Merge Request.
• Participate in code reviews and proactively improve source code quality.
• Coordinate with QA/QC to analyze and fix defects and prevent recurring issues.
• Comply with Coding Standards, Git Flow/Branching Strategy, and the company’s software development processes.

Performance Optimization

• Optimize rendering, bundle size, and page load time.
• Apply lazy loading, dynamic import, memoization, virtualization, and other appropriate techniques.
• Optimize screens with large amounts of data through server-side pagination, filtering, sorting, and virtualization.
• Monitor and improve Front-End performance metrics when necessary.

Security and Data Protection

• Comply with security principles in Front-End application development.
• Do not expose secrets, credentials, or sensitive data in source code and client-side storage.
• Do not log sensitive information such as tokens, OTPs, personally identifiable information, or subscriber data.
• Control and sanitize HTML data rendered from external sources.
• Coordinate in handling security issues identified during development and operations.

Documentation and Project Coordination

• Read and understand business requirements, specification documents, and API documentation.
• Write and update Front-End-related technical documentation when necessary.
• Coordinate with BA/PO/Designer/Backend/QA to clarify requirements and resolve issues during development.
• Participate in team estimation, planning, technical discussions, and retrospectives.

Job requirements:

Education

• Bachelor’s degree or higher in Information Technology, Software Engineering, Computer Science, or related fields.
• Good fundamental knowledge of programming and software development.

Experience

• At least 1 year of Front-End development experience with React/TypeScript in real-world projects.
• Experience participating in products from development through testing and operations is an advantage.
• Experience working with Agile/Scrum is an advantage.

Technology Requirements:

• Language: TypeScript, JavaScript
• Framework: React, Next JS, Flutter, React Native
• Routing: React Router or equivalent routing solutions
• API: REST API, Axios, or equivalent HTTP Client
• Testing: Vitest/Jest, Testing Library, or equivalent frameworks
• Code Quality: ESLint, Prettier, TypeScript strict, Git
• Authentication: JWT/OAuth2 or equivalent authentication/authorization mechanisms
• Performance: Lazy Loading, Code Splitting, Memoization, Virtualization
• Browser: Understanding of Browser mechanisms, HTTP/HTTPS, Cookie, Local Storage/Session Storage, CORS

Professional Knowledge:

• Strong knowledge of HTML5, CSS3, and JavaScript/TypeScript.
• Clear understanding of React component lifecycle, hooks, state management, and rendering.
• Ability to design highly reusable and maintainable components.
• Understanding of SOLID principles, Clean Code, and Separation of Concerns at a level appropriate for Front-End development.
• Basic understanding of HTTP/HTTPS, HTTP2.0, REST API, authentication, authorization, and web security.
• Ability to analyze and troubleshoot performance, memory, and rendering issues.
• Ability to read and understand API Contracts and coordinate with Back-End teams for system integration.

AI and Development Support Tools:

• Experience with AI/AI Agents is not mandatory.
• Familiarity with using AI tools to support work such as documentation research, error analysis, code assistance, code review, or test generation is an advantage.
• Ability to evaluate and verify results suggested by AI tools before integrating them into the system is an advantage.

Soft Skills:

• Strong logical thinking and problem-solving skills.
• Proactive in researching and resolving issues.
• Ability to work independently and collaborate effectively with a team.
• Strong sense of responsibility for work quality and delivery timelines.
• Ability to read and understand technical documentation in English.
• Ability to communicate and clarify requirements with stakeholders.

Preferred Qualifications:

• Experience developing products in Telecom/Fintech/E-commerce/Technology Platform.
• Experience building systems with a large number of users or high traffic volumes.
• Experience building Dashboards, Admin Portals, or complex business management systems.
• Experience handling screens with large amounts of data.
• Experience with Micro Frontend or large-scale Front-End architectures.
• Experience with WebSocket, Server-Sent Events, or real-time applications.
• Experience with CI/CD and software development processes on GitLab/GitHub.
• Good ability to read and understand technical documentation in English.
• Experience applying AI to software development work is an advantage.

Benefits:

• Competitive salary package (Base salary and performance bonuses).
• Probation period salary is 100% of the official salary.
• Comprehensive health and accident insurance.
• 15 days of annual leave, 1 remote work days per month.
• Provision of work equipment (Macbook/ Laptop, mouse, monitor, etc.).
• A creative and modern working environment.

Working location: Red River Building, 885 Hong Ha Street, Hong Ha Ward, Ha Noi

Kindly send your CV to: [email protected]