Maintenance and security for apps built with AI
Built your app with AI? I keep it secure, stable and online.
Lovable, Bolt or Cursor got you far. I take care of the rest: fixing bugs, closing security holes, hosting, database and backups. One dedicated developer, with fixed prices and response times in writing.
Rather call or message first?+31 6 34988015WhatsApp
- 8+ years of experience
- 2-hour response to outages
- Cancellable every month
- Based in ’s-Hertogenbosch
BugFyx has worked for
- ING
- ABN AMRO
- de Volksbank
- VodafoneZiggo
- TCS
Built with one of these tools? Then I can help you.
- Lovable
- Bolt.new
- v0
- Replit
- Cursor
- Claude
And the technology underneath
- React
- Next.js
- TypeScript
- Supabase
- Firebase
- Node.js
- Python
- Java
- Spring Boot
- PostgreSQL
- Vue
Your app works. But is it secure?
AI tools build fast, but leave things behind that you don’t see as a founder. Sound familiar?
Security
- Now
- You don’t know whether your app is secure. An API key in the code or a database open to anyone is invisible to you as a founder.
- With BugFyx
- I find the holes, close them and then check your app for new vulnerabilities every day.
Bugs
- Now
- Every fix breaks something else. You ask the AI to fix one bug and get two new ones.
- With BugFyx
- I find the cause, fix it and check that the rest of your app keeps working.
Availability
- Now
- No one to call when things go wrong. Your app is down and your customers notice before you do.
- With BugFyx
- Monitoring alerts me straight away, and I respond to outages within 2 hours on working days.
Data
- Now
- Customer data without a backup. One wrong action or update and your data is gone.
- With BugFyx
- I set up backups and lock down access to your data.
How it works
In three steps from unsure to maintained.
- 1
App Check
I inspect your app for security, database, hosting and code. Within 5 working days you have a plain-language report, for a fixed €600.
- 2
First things first
Together we decide what comes first. I fix the red points first, so your app is secure before more users arrive.
- 3
Maintenance
With a maintenance plan I then keep your app secure and up to date, from €600 a month. Start within 30 days and I credit the App Check in full.
Commitments in writing, not vague promises
Everyone says they are reliable. These are the response times in every maintenance plan.
Outage: your app is down
Within 2 hours
On working days between 9:00 and 17:00
Serious incident at the weekend
Within 4 hours
Saturday and Sunday
A bug that doesn’t stop your work
Picked up the next working day
On working days
How to reach me
- EmailReply within 1 working dayIn Basic, Plus, Business
- WhatsAppReply within 4 hoursIn Plus, Business
- PhoneAnswered or called back within 1 hourIn Business
Fixed prices, cancellable every month
Start with an App Check, then choose the plan that suits your app.
- App CheckA report on security, database, hosting, backups and code, within 5 working days. If you take a plan within 30 days, I credit the €600 in full.€600one-off, excl. VATMore about the App Check
The fixed price covers:
- One app
- Up to 15 screens or pages
- One database
- Up to 3 connections, such as payments, email or signing in with Google
- BasicFor a stable app that needs a fix now and then€600a month, excl. VATChoose Basic
- 5 support hours a month
- Email: reply within 1 working day
- PlusRecommendedFor an app with paying users that keeps growing€1,100a month, excl. VATChoose Plus
- 10 support hours a month
- Email: reply within 1 working day
- WhatsApp: reply within 4 hours
- BusinessFor an app your business runs on€2,050a month, excl. VATChoose Business
- 20 support hours a month
- Email: reply within 1 working day
- WhatsApp: reply within 4 hours
- Phone: answered or called back within 1 hour
Custom software
Rather have something new built?
I also build custom SaaS, web apps and internal tools. Projects start at €5,000, and you get a fixed price up front. My own SaaS Traecy is used by 7 companies in food & feed.
- Java
- Spring Boot
- PostgreSQL
- Vue
- TypeScript
“With this package, we have already been able to prevent several contaminations and saved hundreds of euros on laboratory analyses.”
Hi, I’m Patrick
I am a full-stack software engineer with 8+ years of experience in software a lot depends on, at companies such as ING, ABN AMRO, de Volksbank and VodafoneZiggo.
With BugFyx I help founders and companies that built an app with AI. No ticket system and no rotating developers: you work with me directly.
Frequently asked questions
What is BugFyx?
BugFyx is the software company of Patrick Willemsen from ’s-Hertogenbosch, the Netherlands. I maintain and secure apps built with AI, for example with Lovable, Bolt.new, v0, Replit, Cursor or Claude: I fix bugs, close security holes and take care of hosting, database, monitoring and backups. I also build custom SaaS and web apps: projects start at €5,000, and you get a fixed price up front. You always work with me directly, with fixed prices and response times in writing.
Which AI tools and technology do you work with?
I take over apps built with Lovable, Bolt.new, v0, Replit, Cursor, Claude or another AI tool. The technology underneath is usually React, Next.js or Vue with TypeScript, and a database in Supabase, Firebase or PostgreSQL. Node.js, Python, Java and Spring Boot are familiar ground too.
What is the App Check?
The App Check is an inspection of your app for a fixed price of €600 excl. VAT. I check security, database, hosting, backups, outdated packages and code quality. Within 5 working days you get a plain-language report with the risks ranked red, orange and green, and we go through it together in 30 minutes.
How fast do you respond when my app is down?
For an outage I respond within 2 hours, on working days between 9:00 and 17:00. For a serious incident at the weekend within 4 hours. A bug that does not stop your work, I pick up the next working day. These times apply in every plan. Because your app is monitored, I often get an alert before you notice.
Do you do penetration tests?
No. I do not carry out formal penetration tests or issue pentest reports. If you need one for a certification or a client’s requirement, a specialised firm is the right party. With the App Check and maintenance, I make sure your app goes into that well prepared.
How long am I tied to a maintenance plan?
Not long: every plan can be cancelled monthly, with a notice period of one month.
From the guides
Is your Lovable, Bolt or v0 app secure? 10 things to check
Your app works and your first customers are logging in. But is it secure? These ten checks show where AI-built apps leak most often, and what to do about it.
Read the guideSupabase Row Level Security explained for founders
If your app runs on Supabase, Row Level Security decides who may see which data. Here is how it works in plain language, how to check that it is set up right and which mistakes you want to avoid.
Read the guideLaunching your AI-built app: a checklist for hosting, backups and monitoring
What to sort out before real users rely on your app: your own accounts, separate environments, backups that work, monitoring, email that arrives and GDPR.
Read the guide
Know where your app stands within 5 working days
With the App Check you get a clear report on security, database, hosting and backups for €600. If you take a maintenance plan afterwards, I credit the €600 in full.
- Fixed price
- Plain-language report
- Within 5 working days