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Auth Done Right: Authentication Strategies for MVPs

Auth Done Right: Authentication Strategies for MVPs

When to use social login, magic links, or email/password — and how to avoid common auth mistakes in early-stage products.

Auth Done Right: Authentication Strategies for MVPs

Authentication is one of those features that feels simple but has a hundred ways to go wrong. Choosing the wrong approach adds complexity, frustrates users, and occasionally creates security problems you didn't anticipate.

For an MVP, the goal is simple: get users in the door securely and quickly, without building a custom auth system from scratch.

The rule: don't build auth yourself

If you take away one thing from this article, let it be this: don't roll your own authentication.

Custom auth systems require handling password hashing, secure session management, brute-force protection, account recovery flows, and token rotation correctly. Each of these has well-documented attack vectors. Getting any one wrong creates real vulnerabilities.

Use an existing auth provider. Firebase Authentication, Supabase Auth, Auth0, and Clerk all handle this correctly so you don't have to. You configure; they secure.

Choosing your auth method

Different products suit different authentication methods.

Email + password

The classic. Users enter an email and password; your provider stores a hashed password; they log in with credentials.

Use when:

  • Your audience is less tech-savvy and expects traditional login forms
  • You're building a B2B product where corporate email addresses are important

Watch out for:

  • Requires a password reset flow from day one
  • Higher friction than alternatives

User enters their email. They receive a one-time link. They click it and they're in. No password required.

Use when:

  • You want lower friction at signup
  • Your users are comfortable with email-based workflows
  • Sessions are longer and re-authentication is infrequent

Watch out for:

  • Slower login flow — requires opening email
  • Doesn't work well if users frequently switch devices or use shared inboxes
  • Can fail with strict corporate email filters

Social login (Google, GitHub, LinkedIn)

Users authenticate with an existing third-party account. No new credentials to remember.

Use when:

  • Sign-up conversion matters (consumer products, developer tools)
  • You're building for an audience with a dominant platform (GitHub for devs, Google for most others)
  • You want verified email addresses without sending verification emails

Watch out for:

  • Enterprise users sometimes can't or won't use personal Google accounts
  • Account recovery is tied to the third-party provider

The MVP-optimal setup

For most MVPs, the winning combination is:

  1. Google OAuth as the primary option — high conversion, low friction, email verified automatically
  2. Email + password as a fallback — for users who won't use social login
  3. No complexity requirements for v1 — just enforce minimum length

Skip magic links, GitHub OAuth, and multi-factor authentication for your first version. Add them when user feedback or security requirements demand them.

What to skip until you need it

  • Two-factor authentication (2FA) — add when users or compliance require it
  • SSO / SAML — an enterprise feature; only relevant when enterprise customers ask for it
  • Phone number auth — useful for specific use cases (gig economy, booking platforms), not a default
  • Custom JWT handling — let your auth provider manage tokens

Authentication is one area where boring is better. Use a trusted provider, configure it correctly, and focus your engineering time on your actual product.

If you want auth set up correctly as part of a complete MVP build, let's talk.

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