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Reactll — AI & Software Engineering Reactor Technology

You vibe-coded it. Now make it hold up. Safe for real users and real payments.

Lovable, Bolt, Cursor and Replit get an app to a demo fast. We review what the AI wrote, close the holes and keep what works.

Security Checklist

First step

System review · about a week

If a rewrite would genuinely be cheaper, the review says so, with the numbers.

Keep what works

2018

Building and running live software since

7

Products of our own, written with AI coding agents and run live

1 week

System review, usually delivered within a week

3

Cities: Istanbul, Amsterdam and Miami

What walks in

The signs an AI-built app is not ready for real users yet, and what we do about each

01

Every new prompt fixes one thing and breaks two others.

Changes reach the live app through version control and a test copy (staging), not straight from a prompt.

02

Users might see or change data that is not theirs.

Every API route and database query checks on the server who is asking. Per-user data rules (row-level security) are tested with a second account.

03

API keys and secrets live in the frontend or the repository.

Powerful secret keys move to the server. The live app and the test version get different keys and different databases.

04

It works on the demo account and falls over with real users.

Business logic moves out of the browser code. Input is checked on the server, and login, sign-up and AI features get usage limits.

05

Payments, emails or webhooks fail quietly.

Payment and webhook messages are checked as genuine, and nothing breaks if one arrives twice. Failed emails and background tasks retry and alert a person.

06

Nobody on the team can explain what the code does.

A written system review of the code, database rules, hosting and connected services: what is broken, what is fragile and what is fine.

Who it is for

Built for apps that already matter to someone

Lovable · Bolt · v0 · Replit · Cursor · Claude Code

A good fit

You have an early product and want to keep it.

  • Real users are coming, and you want to keep the prototype rather than start over.
  • It runs on React or Next.js with Supabase, Firebase or Node.
  • You need someone responsible for security, data and keeping it online from now on.

Not a fit yet

Still validating the idea?

If nobody uses it yet, keep prompting; it is cheaper than a review.

Come back when real users and payments are close.

Not a fit yet

Want a rewrite on day one?

We decide that after reading the code, not before, and we do not keep prompting the same tool for you.

Start with the review; it says when a rewrite is cheaper.

Security checklist

The vibe-coded app security checklist

Sixteen checks we run on every AI-built app before it meets real users. Tick what you can confirm today. Your ticks are saved only in your browser.

0 of 16 confirmed

Tick only what you can confirm, not what you assume. Several basics are unconfirmed. That is normal for an AI-built app, and exactly what the review covers. In good shape. The unticked items are where incidents usually start. All 16 confirmed. Keep it that way as the app changes.

Free Check of the First Four
  1. 01

    Access and data

    3 checks
  2. 02

    Secrets and keys

    3 checks
  3. 03

    Input and abuse

    4 checks
  4. 04

    Payments and integrations

    2 checks
  5. 05

    Running it

    4 checks

How we work

Dangerous things first, then what will not cope with growth

  1. 01 · Review

    What happens

    System Review, in About a Week

    We read the code, database rules, hosting and connected services, run the checklist for real, and write down what is broken, fragile and fine.

  2. 02 · Fix

    What happens

    The Dangerous Things First

    Exposed data, leaked keys, missing server checks and unchecked payments come before anything cosmetic. This usually takes days, not weeks.

  3. 03 · Clean up

    What happens

    What Will Not Cope with Growth

    Business logic moves out of the browser code, and the parts that earn money get automatic tests. We also set up a test copy, backups, error logs and alerts.

  4. 04 · Run

    What happens

    Keep It Running

    On a monthly plan the same engineers fix, watch and keep improving it. You keep prompting new ideas; we keep the live app safe.

FAQ

Questions people ask before a rescue

Rarely. Most vibe-coded apps have a sound shape and a few dangerous gaps. We keep what works and replace what cannot be made safe. If a rewrite would genuinely be cheaper, the review says so, with the numbers.
Apps built with Lovable, Bolt, v0, Replit, Cursor and Claude Code, typically React or Next.js on Supabase, Firebase, Node or Python. When a product has outgrown the tools it started on, we can also move it onto Laravel.
Yes, and you should. We set up a test copy (staging) and a review step. Then prompts can keep adding features without sending a security hole straight to your live app.
Usually within a week. The system review itself takes about five working days, and serious problems are reported the day we find them, not at the end.
If you need one, yes. Either way, we only need read access for the review, and we work in your own code repository and accounts from day one.

Built it with AI, now worried about real users?

Tell us what you built it with and what is breaking. We review what the AI wrote, close the holes and keep what works.

Book a Call 30 Minutes