Securing Your Web Application: A Practical Checklist

Security Is Everyone's Responsibility

Security isn't a feature you add at the end — it's a mindset that permeates every decision. The good news: most vulnerabilities are preventable with well-known best practices.

Authentication & Authorization

• Use bcrypt or Argon2 for password hashing — never MD5 or SHA-1.
• Implement 2FA — TOTP-based two-factor authentication is now table stakes.
• Session management — Use secure, HttpOnly, SameSite cookies. Rotate session tokens after login.
• Rate limiting — Protect login and API endpoints from brute-force attacks.
• RBAC — Role-based access control ensures users only see what they should.

Input & Data Protection

• Validate everything server-side — Client-side validation is for UX, server-side is for security.
• Parameterized queries — Prevent SQL injection by never interpolating user input into queries.
• XSS prevention — Escape output, use Content Security Policy headers, sanitize HTML input.
• CSRF tokens — Protect state-changing requests with anti-CSRF tokens.
• Encrypt sensitive data — Use AES-256 for data at rest, TLS 1.3 for data in transit.

Infrastructure

• HTTPS everywhere — No exceptions. Use HSTS headers.
• Security headers — X-Content-Type-Options, X-Frame-Options, Referrer-Policy.
• Keep dependencies updated — Automate vulnerability scanning with tools like Dependabot or Snyk.
• Logging & monitoring — Log security events and set up alerts for anomalies.

The Lumynd Approach

Every platform we build includes these protections by default. Security isn't an add-on — it's baked into our development process from day one.