You built it with AI. We make it ready for real users.
59s is a tech studio that takes the app you shipped with Claude Code, ChatGPT, Cursor, Lovable or any other AI and makes it secure, monitored, tested and fast — at a fixed price, before you have to find out the hard way.59s is a tech studio that takes the app you shipped with AI and makes it secure, monitored, tested and fast — at a fixed price, before you have to find out the hard way.
It works in the demo. Will it survive your first thousand users?
AI tools are great at getting you to a working product. They are not great at the parts nobody sees until something breaks:
- API keys and passwords sitting in the code
- A database anyone can read if they know where to look
- No one knows an error happened until a customer complains
- Every change is a gamble, because nothing is tested
- Costs and speed nobody has checked at ten times the traffic
- Code the next developer will want to rewrite from scratch
- A new developer needs a week just to get it running
You don't need to start over. You need someone who has run software in production to go through it, fix what matters and tell you what can wait.
Three steps. You know the price before each one starts.
Illustration: your app drawn as one block that turns out to be four connected parts. A scan finds three risks; the rescue fixes them and builds a wall, watchtowers and a gate around the village; the care plan turns the back tower into a command center and keeps watch while threats stay outside.
- 1
Diagnostic
$7505 business days
We go through your app and your code. Every risk, ranked by severity, with a fixed price to fix it.
- 2
Rescue
from $6,0003 to 5 weeks
We fix what we found and build what was missing: a locked-down perimeter, alerts, tests on every change.
- 3
Care plan
from $1,200/mocancel any month
We keep watch: monitoring, security updates, fixes and small improvements, with a reply within one business day.
What each step includes
Diagnostic
$7505 business days
We go through your app and your code and send you a report with a 0–10 score in seven areas, every risk we found ranked by severity, and a fixed price to fix it. If you go ahead with a rescue within 30 days, the $750 comes off the price.
| Seven areas, all included | What we look at | Included |
|---|---|---|
| Security | Exposed keys and secrets, database permissions, login and password reset | |
| Personal data | What you store, who can access it, and whether you're meeting GDPR and LGPD | |
| Monitoring | Whether anyone finds out when something breaks — before your users do | |
| Tests | Whether a change can break something that already worked, how much of the code is covered, and which critical paths have no tests | |
| Scale & cost | What happens at 10× your current users, and what it costs per month | |
| Code | Whether another developer can pick it up and keep going | |
| Developer experience | Whether a new developer can run it locally in under an hour, and whether every change is tested and deployed automatically |
Rescue
from $6,0003 to 5 weeks
We fix what the diagnostic found. Scope and price are agreed in writing before we start. Half when we sign, half when we deliver.
| Essential | Complete | |
|---|---|---|
| Price | $6,000 | $10,000 |
| Time | 3 weeks | 5 weeks |
| Security and data risks closed | ||
| Error monitoring and alerts | ||
| Tests on the critical paths | ||
| Tests run automatically on every change | ||
| Code organized so it can grow | — | |
| Performance and cost review | — | |
| Test coverage raised to the target set in the diagnostic | — | |
| Local setup, automated deploys and docs for new developers | — |
Building something bigger? Rebuilds and new products from scratch start at $15,000. Let's talk.
Care plan
from $1,200/mocancel any month
After the rescue, we keep an eye on it: monitoring, security updates, bug fixes and small improvements, with a reply within one business day. Cancel any month.
| Care | Care & Grow | |
|---|---|---|
| Price | $1,200/month | $2,400/month |
| Hours included | up to 12 | up to 24 |
What we check. All of it, every time.
Most studios keep their method to themselves. Here's ours.
Security
3Exposed keys and secrets, database permissions, login and password reset
Personal data
4What you store, who can access it, and whether you're meeting GDPR and LGPD
Monitoring
1Whether anyone finds out when something breaks — before your users do
Tests
2Whether a change can break something that already worked, how much of the code is covered, and which critical paths have no tests
Scale & cost
8What happens at 10× your current users, and what it costs per month
Code
6Whether another developer can pick it up and keep going
Developer experience
3Whether a new developer can run it locally in under an hour, and whether every change is tested and deployed automatically
Overall
3.9Anything under 7 goes into the rescue, ranked by severity, with a fixed price to fix.
Why 59s
More than 20 years in technology, design and product.
We've spent two decades building and running digital products for clients ranging from early-stage startups to large companies.
Fixed price, in writing.
You know what you'll pay before we start. If we underestimate the work, that's on us.
Our guarantees
Diagnostic.
If we don't find anything worth fixing, you get your money back.
Rescue.
The price is fixed. If the work takes longer than we estimated, the extra cost is ours, not yours.
Questions
Which tools and languages do you work with?
We expect most apps to reach us built on React, Next.js, Vue, Node.js, TypeScript, Python, PostgreSQL, Supabase, Firebase or React Native. But we love a challenge: if yours runs on something else, bring it, and we'll tell you honestly in the diagnostic whether we're the right people.
Who owns the code?
You do. Code, accounts and access stay with you from day one.
Will you sign an NDA?
Yes, before you share anything.
Where are you?
In Brazil, working with clients in the US and Europe. Our working hours overlap with US business hours.
What if the diagnostic finds nothing?
Then you get your money back.