How do I choose a backend for push notifications and auth?

Choosing a backend for push notifications + auth usually comes down to one question:

Do you want to build these yourself, or use a managed platform that handles most of it for you?

1) Start with your requirements

Answer these first:

• Platforms: iOS, Android, web, desktop?
• Scale: tens, thousands, or millions of users?
• Notification complexity: simple alerts, scheduled notifications, segmentation, retries, analytics, delivery tracking?
• Auth needs: email/password, social login, magic links, MFA, enterprise SSO, custom roles?
• Team size/time: do you want speed, or maximum control?
• Compliance: HIPAA, SOC 2, GDPR, data residency?

2) Common backend options

A. Managed BaaS / all-in-one

Examples: Firebase, Supabase, AWS Amplify, Azure Mobile Apps (less common now)

Best for:

• Fast MVPs
• Small teams
• Simple auth + basic push
• Minimal backend ops

Pros:

• Auth is easy to set up
• Push notification integration is straightforward
• Less infrastructure to maintain
• Good SDKs and docs

Cons:

• Vendor lock-in
• Harder to implement highly custom auth flows or notification logic
• Can get expensive or awkward at scale
• Push often still relies on FCM/APNs under the hood anyway

Typical pick:

• Firebase Auth + FCM if you want the quickest path for mobile apps
• Supabase Auth if you want open-source/Postgres-centered architecture

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B. Cloud provider services

Examples: AWS Cognito + SNS / Pinpoint, Azure AD B2C + Notification Hubs, Google Cloud / Firebase

Best for:

• Teams already using a cloud provider
• Apps needing more enterprise/compliance features
• Moderate to large scale

Pros:

• More control than BaaS
• Better integration with your infrastructure
• Good for security/compliance requirements

Cons:

• More setup complexity
• Docs and UX can be rough
• You may still need extra glue code for notifications

Typical pick:

• AWS Cognito for auth if you’re already on AWS
• Firebase Cloud Messaging (FCM) for push, even if auth is elsewhere
• Azure AD B2C if your org is Microsoft-centric

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C. Custom backend + specialized providers

Use your own API/backend, plus:

• Auth: Auth0, Clerk, Firebase Auth, Cognito, custom auth
• Push: FCM, APNs, OneSignal, Braze, Airship, Customer.io

Best for:

• Apps with custom business logic
• Need for multi-channel messaging
• Mature products with engineering resources

Pros:

• Maximum flexibility
• Easier to swap components later
• Better fit for custom segmentation, event-driven notifications, and roles/permissions

Cons:

• More engineering work
• More moving parts
• You own integration, security, token handling, retries, delivery logic

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3) Practical recommendation by scenario

If you want the fastest MVP:

• Auth: Firebase Auth or Supabase Auth
• Push: FCM for Android/web, APNs via FCM for iOS
• Why: quickest integration, minimal backend overhead

If you want open-source + SQL/Postgres:

• Auth: Supabase Auth
• Push: FCM/APNs directly, or OneSignal if you want an easier campaign layer
• Why: good balance of control and speed

If you need enterprise auth:

• Auth: Auth0 or AWS Cognito
• Push: OneSignal, Braze, or FCM/APNs with your own backend
• Why: stronger SSO/MFA/enterprise support

If you need advanced notification campaigns:

• Auth: any solid auth provider
• Push: Braze, Airship, Customer.io, or OneSignal
• Why: better targeting, analytics, and multi-channel workflows

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4) Push notifications: what to look for

For push, check:

• Platform support: iOS, Android, web
• Token management: device tokens, token refresh
• Segmentation: user groups, tags, topics
• Scheduling/retries
• Analytics: opens, conversions, delivery
• Rich notifications: images, actions, deep links
• Ease of sending from backend
• Cost at scale

If you just need app notifications, FCM + APNs (often through a unified service) is usually enough.

If you need marketing-style messaging, consider OneSignal or Braze.

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5) Auth: what to look for

For auth, check:

• Login methods: email/password, OAuth, magic links, SSO
• MFA
• Session handling
• Role-based access control
• User management/admin tools
• Passwordless support
• Compliance and audit logs
• SDK quality and ease of integration

If you need simple consumer auth, Firebase/Supabase are often enough.

If you need enterprise-grade identity, Auth0/Cognito/Azure AD B2C are better fits.

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6) A good decision rule

Use this shortcut:

• Need speed? Firebase
• Need SQL/open-source? Supabase
• Need enterprise auth? Auth0 or Cognito
• Need sophisticated messaging? Braze/OneSignal/Airship
• Need maximum control? Custom backend + FCM/APNs + auth provider

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7) My default recommendation

If you’re building a typical mobile/web app and want a safe default:

• Auth: Firebase Auth or Supabase Auth
• Push: FCM + APNs, possibly via OneSignal if you want easier campaign management
• Backend: your own API if you have nontrivial business logic

That gives you a good balance of speed, reliability, and flexibility.

If you want, I can also give you:

1. a comparison table of Firebase vs Supabase vs Auth0 vs Cognito, or
2. a recommended stack based on your app type and team size.