Thousands of Django applications face daily hacking attempts, with 60% of affected companies failing within six months of a data breach. Before launching, developers must verify their security posture. Essential steps include setting DEBUG=False and properly configuring ALLOWED_HOSTS to restrict application access. Your SECRET_KEY must be stored in environment variables, never committed to version control, while security headers like SECURE_SSL_REDIRECT and HSTS enforce HTTPS connections.

Strong authentication requires more than default settings. Implement Argon2 password hashing and enforce 12-character minimums. Add two-factor authentication for sensitive views and rate-limit login attempts to five tries per 15 minutes. Session cookies need HttpOnly and SameSite=Strict flags. For APIs, use JWT tokens with short lifespans and implement throttling to prevent brute-force attacks and scraping.

Prevent SQL injection by always using Django's ORM instead of raw query strings, and validate all user input with built-in validators. Protect against XSS attacks through template auto-escaping and the bleach library for sanitizing HTML content. Configure a Content Security Policy (CSP) to block unauthorized scripts. Secure file uploads by validating extensions with FileExtensionValidator, checking MIME types, and scanning for malware using ClamAV before storage.

Handle high traffic by implementing Redis caching, database connection pooling, and Nginx load balancing with rate limiting. Process emails and reports asynchronously using Celery to keep response times fast. Before going live, run SAST tools like Bandit and Safety to scan dependencies. Finally, deploy with proper monitoring through Sentry and audit logging to catch threats early.