Contact person: Business Client

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Location: Ahmedabad, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I’m midway through moving a FlutterFlow app from Firebase Auth to Supabase. All user rows are already in the Supabase auth table, but every login fails with
crypto/bcrypt: bcrypt hashes must start with '$', but hashedSecret started with 'F'

Firebase stores SCRYPT hashes, so I need a quick, reliable bridge that lets existing users sign in on Supabase with their current passwords—no reset e-mails, no friction.

Where things stand
• Environment: this is strictly a Bug Fix phase, not a long-term feature sprint.
• Password flow today: hashes travel straight from Firebase → Supabase; no proxy service sits in between.

Your task
1. Patch the import so Supabase accepts the old hashes.
2. Add a just-in-time “rehash on first login” that silently verifies against Firebase Auth, then rewrites the hash in bcrypt for Supabase.
3. Prove that a user can log in through the existing FlutterFlow screens without code changes on the front end.
4. Hand over the working code (Node or Deno preferred) plus a short setup guide I can follow to replicate in staging and production.

Access I’ll provide
• Supabase service + anon keys
• Firebase service account
• Full FlutterFlow project

Acceptance criteria
✓ Existing Firebase user logs in via Supabase with no password reset.
✓ Supabase now stores a valid bcrypt hash.
✓ Subsequent logins authenticate solely against Supabase.
✓ Guide reproduces the flow in under 15 minutes.

Timeline: 24 hours from hire." (client-provided description)