AI App Stack Fixes
By Hyder ShahFounder · Afterbuild LabsLast updated 2026-04-17
Stack-specific developer help for the five surfaces that break most often in AI-built apps — Supabase, Stripe, Vercel, Firebase, and Prisma + Neon. Each hub maps the exact failure modes AI tools produce in that stack and the fixed-price path to production. From $299 with a 48-hour turnaround — no hourly billing, senior engineers only.
Supabase Developer & Fix Expert
A Supabase developer for fixes: row-level security policies, auth flows, storage rules, and realtime channels on AI-built apps. We close the RLS holes Lovable and Bolt ship with and get Supabase production-ready.
Stripe Integration Fix Expert
A Stripe integration developer for webhook signature verification, idempotency keys, subscription lifecycle, and Stripe Connect payouts. We turn a fragile AI-built Stripe prototype into one you can take real money through.
Vercel Deployment Fix Expert
A Vercel deployment developer for build failures, env-var hygiene, edge runtime issues, and cold-start fixes. We resolve the “won’t publish” and “preview works, prod is broken” failure modes for good.
Firebase Rescue & Migration
A Firebase to Supabase migration developer — or straight Firebase rescue. We harden Firestore security rules, fix Cloud Functions timeouts, and migrate data off Firebase when the cost and lock-in stop working.
Prisma + Neon Postgres Fix
A Prisma Neon developer for schema design, connection pooling, and migration recovery on AI-built apps. We cut the N+1 queries and unblock the migrations AI tools leave in a half-applied state against Neon or Postgres.
Why AI-generated stack code breaks
AI coding tools default to the most popular stack in their training data, which means your rescue depends less on the AI tool and more on the layer that is broken. Lovable, Bolt, v0, and Cursor overwhelmingly scaffold against Supabase for data and auth, Stripe for payments, and Vercel for hosting. The scaffolding compiles. What does not work in production is the wiring: RLS policies left wide open, webhook signatures never verified, env vars pasted into client bundles, Firestore rules copied from outdated tutorials, and Prisma migrations abandoned mid-way.
The layer that breaks first is almost always auth or data. A Supabase developer for fixes spends the first hour auditing RLS — AI tools routinely generate policies that pass TypeScript but allow any authenticated user to read every row. The second-most-common failure is payments: a Stripe integration developer checks webhook signature verification, idempotency, and subscription state machines, because AI-scaffolded Stripe code typically does none of those correctly. Deployment comes third — a Vercel deployment developer fixes env-var drift between preview and production, which is the single most common cause of “preview works, prod is broken”.
Firebase-backed apps — common on v0 and mobile-first MVPs — have their own failure profile. Firestore rules are permissive by default, Cloud Functions time out silently, and the lock-in tightens over time. A Firebase to Supabase migration developer fixes or escapes, depending on the diagnostic. Apps on Prisma and Neon need schema discipline, pgBouncer or Neon pooling, and migrations that do not brick production — see the Prisma Neon developer hub. Pick the stack that matches your symptom, or start with a diagnostic if the failure spans two layers.
Frequently asked questions
Which stack fix do I need if I am not sure what is broken?
Start by matching your symptom. Data or auth errors → Supabase. Payment or checkout errors → Stripe. Deploy or build errors → Vercel. Firestore rule errors or Cloud Function timeouts → Firebase. Migration or query-plan errors → Prisma + Neon. If it spans two stacks (Supabase + Stripe is the classic SaaS combo), book the free diagnostic and we will route it.
When should I rescue a stack vs migrate off it?
Rescue when the stack choice still fits the product — Supabase is a great fit for most SaaS, Stripe is the right payments default, Vercel is the right Next.js host. Migrate when the stack is actively blocking the business: Firebase costs scaling nonlinearly, Vercel pricing at scale, a database that cannot hold the real data model. We do both; the diagnostic recommends which.
Which stack pairs well with Lovable, Bolt, v0, or Cursor?
Lovable and Bolt default to Supabase + Stripe + Vercel — our most common rescue shape. v0 outputs Next.js-only prototypes that need a stack bolted on; we usually pair them with Supabase. Cursor and Claude Code are stack-agnostic; the rescue depends on what the developer chose. Replit Agent frequently needs migration off Replit hosting onto Vercel + Supabase.
Do you migrate Firebase to Supabase?
Yes. It is one of our most-requested engagements. We migrate Firestore collections to Postgres tables with RLS, port Cloud Functions to Supabase Edge Functions or Vercel handlers, and move Firebase Auth to Supabase Auth (or NextAuth / Clerk). Fixed-price, scoped off a diagnostic. See the Firebase rescue hub for the full scope.
What is the smallest stack fix you take on?
$299 Emergency Triage — one critical production bug fixed in 48 hours. That covers things like a broken webhook, a bad RLS policy, a failing deploy, or a timing-out Cloud Function. If the problem is bigger — full RLS rewrite, Stripe Connect implementation, Firebase migration — it is scoped as a fixed-price project off the diagnostic.