MVP Security Guide
Ship fast without getting hacked. The practical guide to security for founders who need to move fast but can't afford a breach.
The MVP Security Dilemma
You're caught between two startup-killing scenarios:
Too Little Security
- • Data breach destroys trust
- • Legal liability for user data
- • Reputation damage is permanent
- • Investors lose confidence
Too Much Security
- • Never ship product
- • Burn runway on compliance
- • Competitors beat you to market
- • Over-engineer before PMF
The solution: Minimum Viable Security—the smallest set of security measures that protects you from catastrophic risk while letting you move fast.
Minimum Viable Security (4-Hour Implementation)
1. Authentication That Actually Works
~1 hourDon't build auth yourself. Use Auth0, Clerk, Supabase Auth, or Firebase Auth. These handle password hashing, session management, and OAuth correctly.
// Rolling your own auth
const hash = md5(password)
if (user.password === hash) {
session.user = user
}// Use a proven auth provider
import { auth } from '@clerk/nextjs'
const { userId } = auth()
if (!userId) redirect('/sign-in')2. Secrets in Environment Variables
~30 minNever commit API keys, database passwords, or secrets to git. Use environment variables and .env files (gitignored).
Quick Audit
# Search for hardcoded secrets
grep -r "sk_live" --include="*.ts" .
grep -r "AKIA" --include="*.ts" . # AWS keys
grep -r "password" --include="*.ts" . | grep -v "test"3. Database Access Rules
~1 hourThe #1 cause of startup data breaches: database rules that allow public access. Configure RLS (Supabase) or Security Rules (Firebase) properly.
Test Your Rules
- 1. Create two test accounts
- 2. Log in as Account A, create some data
- 3. Log in as Account B
- 4. Try to access Account A's data
- 5. If you can see it, your rules are broken
4. HTTPS Everywhere
~15 minEnforce HTTPS on all connections. Most modern platforms do this automatically, but verify.
- • Vercel/Netlify: Automatic, just verify
- • Custom domain: Use Cloudflare for free SSL
- • Add HSTS header: Prevents downgrade attacks
5. Run a Security Scan
~15 minAutomated scanners catch the obvious stuff you missed. Run one before launch and fix critical issues.
Run Get Starter ScanWhat Can Wait
These are important, but won't kill your MVP if missing on day one:
Common MVP Security Mistakes
Stripe secret key in frontend code
Supabase RLS disabled for 'easier development'
Admin routes without authentication
Git history contains old API keys
Debug mode enabled in production
The ROI of MVP Security
Time to implement Minimum Viable Security
Average cost of a startup data breach
of small businesses close within 6 months of a breach
Frequently Asked Questions
We're pre-launch with no users. Do we need security?
Yes, but minimal. Bots scan for vulnerabilities automatically—your empty database won't stop them from finding exposed endpoints. Implement the basics before sharing any public URLs.
Can't we just fix security issues later?
Security debt compounds. Fixing auth architecture after you have users is 10x harder than doing it right initially. The Minimum Viable Security items take 4 hours now vs. weeks later.
What if we get hacked anyway?
Have a response plan: 1) Take affected systems offline, 2) Identify what was accessed, 3) Notify affected users, 4) Fix the vulnerability, 5) Document what happened. Speed matters—don't figure this out during an incident.
Our investor wants SOC 2. Is that needed for MVP?
SOC 2 is for enterprise sales. If you're pre-PMF, it's premature optimization. Focus on basic security now, SOC 2 when you're closing enterprise deals that require it.
Ship Secure, Ship Fast
Check your MVP for critical security issues in 2 minutes. Fix problems before they become incidents.
Get Starter ScanLast updated: January 2025