Why a Cursor-built app needs a different check from a hosted builder
Cursor writes code into your own project, so nothing about hosting, database rules or sign-in is decided for you. That freedom is the reason a Cursor app can grow, and also the reason no platform has looked over its shoulder. Before fixing anything, someone has to find out which stack the AI chose and where each piece runs.
In a hosted builder, the platform owns the hosting, the database and the authentication, so a reviewer knows where to look. In a Cursor project, the same app might use a managed Postgres service, a serverless host, a separate auth provider and a payment provider, each wired by prompts over several weeks. Different chats may have solved the same problem in different ways, so the code base often holds two sign-in flows, three ways to call the database, or environment variables nobody remembers adding.
That is why the first deliverable on a Cursor app is a map, not a patch: which services exist, which accounts own them, how a change gets from the editor to production, and which parts are actually used.
- Hosting: where the frontend and any server code run, and who owns that account.
- Database: which service, which tables, and what rules decide who can read each row.
- Authentication: which provider signs users in, and whether the server checks it on every request.
- Secrets: which API keys exist, where they are stored, and whether any reached the browser or the git history.
- Deployment: whether a release is one repeatable command or a series of manual steps someone remembers.
What to do right now, even if you hire nobody
You can lower the risk of a Cursor-built app this week without a developer. These steps protect ownership, stop the most common leaks and give any future helper a head start. None of them requires changing application logic, and each one can be done in an afternoon by a founder who can follow written instructions.
Put the code in a repository you own
If the project only lives on one laptop, push it to a private repository under your company account today, with its full history.
List every service and its owner
Write down the domain registrar, hosting, database, auth provider, email sender and payment provider, and make sure each account is in the company's name with two people able to log in.
Search for exposed keys
Search the repository, its history and the built frontend files for strings that look like API keys. Rotate any key that appears where it should not, then store it only as a server-side environment variable.
Test with two users
Create two ordinary accounts. Signed in as the first, try to open, edit or delete records that belong to the second by changing IDs in the address bar or in requests. Anything that works is a data leak.
Check that admin pages refuse normal users
Sign in as an ordinary user and open every admin or settings URL directly. Each one should refuse, both in the page and in the request behind it.
Prove you can rebuild from scratch
Clone the repository into a clean folder and follow the README to run it. If that fails, write down every missing step; that list is your deployment documentation.
Turn on error tracking and a backup
Add an error tracker and an uptime alert, and restore one database backup into a test copy to prove it works.
The problems that show up most in AI-written code
AI-written code tends to fail in predictable places: access checks that live only in the interface, keys that travel to the browser, payment events that are trusted without verification, and logic duplicated across files. These are fixable, but only after someone reads the code paths end to end instead of trusting that the app looks finished.
The pattern behind most of them is the same. Each prompt solved the task in front of it, and nothing checked the whole. A page hides a button from non-admins, but the endpoint behind it accepts anyone. A webhook handler updates an order on any request that looks right. A helper written in week one is rewritten in week four with slightly different rules, and both versions stay in use.
- Authorization in the interface only: buttons hidden, endpoints open.
- Database rules missing or too broad, so any signed-in user can query any row.
- Secret keys bundled into frontend code or committed to git history.
- Payment webhooks processed without checking the signature.
- Duplicate or dead code paths that make every later change risky.
- No tests around sign-in, payments or data access, so a fix in one place quietly breaks another.
Which path fits your situation
The right next step depends less on how the app was written and more on what you can access today. Someone with the full repository and every account can move straight to review. Someone whose previous developer still controls the hosting needs to recover access first. The table below matches common situations to a likely path.
| Situation | Access you need | Likely path |
|---|---|---|
| Only a repository | Repository with history, list of services the code expects | Rebuild the environment from the code, then review data access and secrets before going live |
| Live product with no documentation | Hosting, database and auth provider accounts, plus the repository | Map the running services, write the missing setup notes, then review and fix in order of risk |
| Deployment broken | Hosting account, build logs, environment variable list | Restore one repeatable deploy first, then return to features |
| Previous developer still holds the accounts | Proof that the company owns the domain, payments and data | Recover accounts you legitimately own through each provider's ownership process; where ownership is disputed, speak to a lawyer |
| App works locally, never shipped | Repository and the founder's notes on what it should do | Review, close the leaks, set up hosting in the company's name, then launch |
What a senior review of a Cursor app covers
A senior review reads the code that runs in production, tests it with real accounts, and turns what it finds into a ranked list you can act on. The point is to separate the few problems that could hurt customers from the many that only slow development, so the money goes to the right fixes first.
At Servify Labs, senior engineers do this with AI tools, including Claude, inside their own workflow, and a person checks every finding. The review covers the same five areas listed earlier: hosting, database access, authentication, secrets and deployment, plus payments if the app takes money. Each finding states where it is, what could happen, and what fixing it involves.
- What you receive: a written, ranked list of findings, the service and account map, setup and deployment notes, and a recommendation on what to keep and what to replace.
- If you continue: fixes delivered in two-week sprints, starting with anything that exposes customer data or payments.
- Ownership: you own the code, designs and infrastructure from day one, and every account stays in your name.
- Out of scope: penetration testing by a specialist firm, compliance certification, legal advice on disputed ownership, and any promise that the app is free of every possible flaw.
Keep and fix, or rebuild?
Most Cursor-built apps are worth keeping in part. The decision should come from reading the code, not from a first impression or a quote given without opening the repository. Keep what is tested or simple to test, replace what is tangled and risky, and decide module by module rather than for the whole app at once.
A rebuild is usually justified only when the data model itself is wrong for the product, or when no part of the code can be trusted without rewriting it anyway. Even then, the existing app is useful as a working specification of what users expect.
Run it
Get the app running from a clean checkout before judging it.
Score each module
For sign-in, data, payments and core features, note whether it works, whether it is tested, and how risky a change would be.
Fix the exposures first
Close data-access and secret problems before any feature work, whatever you decide about the rest.
Decide per module
Keep, refactor or replace each part, and write the reason down so the next developer does not reopen the question.
How the process works with Servify Labs
The process starts with a free intro call about your app, your users and your deadline. Within about 20 minutes after that call you receive a quote and a written proposal. A second call follows the next day, and work starts the day after the agreement is signed and the first sprint is paid.
Ongoing development runs in two-week sprints from $3,500, paid upfront per sprint, and you can pause or cancel at any time. Reviews and takeovers of an existing app are quoted after the call, once the size of the code and the access situation are clear.
When Servify Labs is not a fit
Servify Labs is not the right choice for every Cursor project. If you need one bug patched before a demo tomorrow, have a budget below a single sprint, or do not plan to keep building the product after launch, a freelancer for a single fix or the self-check list above will serve you better.
It is a fit when real users or payments depend on the app, when you want someone to read the code properly before you scale it, and when you expect to keep developing it.
Frequently asked questions
What access do you need to look at my Cursor-built app?
Read access to the repository with its history, and a list of the services the app uses. For a live app, view access to hosting, database and auth provider accounts helps. You stay the owner of every account; nobody needs your personal passwords.
Will you throw away the code Cursor wrote?
Not by default. The code is reviewed module by module, and parts that work and can be tested are kept. Replacement is recommended only where a part is risky to keep, and the reason is written down.
Can you promise my app has no security problems after the review?
No honest reviewer can promise that. A review finds and ranks the problems it can see, and the fixes close them. You get a clear list of what was checked, what was found and what was fixed, not a certificate.
How much does it cost to fix a Cursor-built app?
It depends on the size of the code, how many services it uses and what access you have. Ongoing development runs in two-week sprints from $3,500. Reviews and takeovers are quoted after the free intro call, usually within about 20 minutes.
How fast can work start?
After the intro call you get a proposal within about 20 minutes, a second call the next day, and work starts the day after the agreement is signed and the first sprint is paid.
Who owns the code and accounts afterwards?
You do, from day one: the code, the designs and the infrastructure. Accounts are set up or kept in the company's name.
What happens after the fixes?
You can stop, keep building in further two-week sprints, or move to regular maintenance. Each sprint is paid upfront and can be paused or cancelled.
My previous developer built it with Cursor and has left. Where do I start?
Start by getting the repository and every account into the company's name, then follow the guide on what to do when a developer abandons your app.
Related
“These guys stepped in, fixed the issues, improved the UI and UX, and got us launched in just two weeks.”
Get a senior read of your Cursor-built app
A free intro call, then a written proposal within about 20 minutes. You keep ownership of the code and every account.
Book a free intro call