Overview

Led the modernization of Telecrm's frontend architecture and implemented comprehensive security hardening across all platforms (web, iOS, Android).

Frontend Modernization

• Angular Migration: Migrated the entire application from Angular 13 to Angular 17, bringing modern features, improved performance, and better developer experience.
• Build System Upgrade: Changed the build script from Webpack to esbuild, drastically improving build times and enabling faster development iteration.
• Testing Pipeline Fix: Fixed the internal testing pipeline after migration, resolving issues that were previously hidden due to slow page rendering speed.

Security Hardening

• Content Security Policy: Added CSP_NONCE support across the application, implementing nonce-based Content Security Policy for stronger XSS protection.
• SSL Pinning: Implemented SSL certificate pinning across all platforms to prevent man-in-the-middle attacks.
• Root Detection: Added root/jailbreak detection on mobile platforms to protect against tampered devices.
• HTTP Restriction: Disallowed plain HTTP requests across all applications, enforcing HTTPS-only communication.
• JWT Invalidation: Implemented JWT token invalidation on logout using Redis, ensuring tokens cannot be reused after logout. Chose Redis over Firebase servers due to cost considerations.
• Permission Audit Logs: Added updation logs when users change permissions, tracking who changed what and what permissions were granted/revoked. Also added WebSocket support for real-time permission updates to affected users.

Technologies Used

• Angular 17: Modern frontend framework
• esbuild: Fast JavaScript bundler
• Redis: JWT invalidation store
• WebSockets: Real-time permission updates
• Content Security Policy: Web security standard

Impact

• Improved build performance and developer experience
• Significantly reduced security vulnerabilities across all platforms
• Ensured secure token lifecycle management
• Added audit trail for permission changes