Custom software · São Paulo, Brazil
You see it working before you pay.
Custom systems in four stages. You approve each one before paying for the next — and you can stop between them, with no penalty.
Paid stage by stage
The most you risk is the first stage — and it is the smallest of the four.
- CNPJ 68.351.441/0001-71
- Invoice per stage
- Signed contract
How it works
Four stages. You approve each one.
Every stage ends with something you can see working. Only then is the next one charged.
-
Assessment
What will be built, what each stage costs and the date of each delivery. It becomes an annex to the contract.
Deliverable Scope + schedule -
Prototype
Clickable screens and flows before the system is written, while changing things is still cheap.
Deliverable Clickable prototype -
Partial delivery
The core of the system running in your own environment. You test it with your own data.
Deliverable Module in production -
Final delivery
Complete system, documented and with training. You know how to use it and you know what you have.
Deliverable System + documentation
Between one stage and the next: you approve and carry on — or you stop, with no penalty.
Every stage you pay for comes with an invoice. If something we delivered is defective, we fix it at no cost for 30 days after final delivery.
What stays with you
The code is yours. From the first stage.
- The repository is yours from the first stage — not at the end, when turning back is no longer an option.
- It runs on your account, on your server, with credentials in your company's name.
- Changing suppliers one day does not depend on asking anyone for anything.
Brazilian Law 9.609/98, art. 4 — in commissioned development, the rights belong to the party who commissioned the work. The contract says so in writing.
Proof
Clients in five countries, three continents.
All of them hired remotely, from São Paulo — and most of them hired again.
-
Mexico
-
-
-
-
UDLAP
Inventory control · parts database · predictive model for Parkinson's
-
-
Colombia
-
-
ContabXpert
Council of State rulings · court documents · accounting
-
-
Argentina
A/B testing · statistical study of the platform itself
-
-
Spain
Carlos López Herce · insurance brokerage in Navarre · migration from Python to Java
-
-
Ecuador
-
U. de Guayaquil
Biology thesis · geospatial analysis of the black ark clam in the Jambelí archipelago
-
-
19
client ratings, one per project delivered
-
8
clients who hired again
-
1st
in Brazil in Programming and Technology — 23rd worldwide among 14 million professionals on Workana
“Arnaldo did an outstanding job. His command of Python and data science is remarkable, and it showed at every stage of the project. Communication was clear, fluid and always focused on results.”
“Arnaldo is reliable and shows initiative: once he is clear on what is needed he moves ahead, and if he has any doubt he gets in touch straight away. It is a good experience working with him. Recommended.”
“He is a responsible person: on the day he said he would review the work, he delivered on time.”
Before we talk
The four questions everyone asks.
What if I want to stop halfway?
You can. You can stop between any two stages, with no penalty. Whatever has already been delivered and paid for stays yours, including the code.
What does it cost?
There is no price list: the price of each stage comes out of the Assessment, in writing, before you commit to anything. If it does not justify the investment, we tell you instead of selling you something.
How long does it take?
It depends on the scope — any timeline given before the Assessment would be a guess. The schedule with the dates comes with the proposal and becomes an annex to the contract.
Do you invoice and sign contracts?
Yes to both, on every project. The CNPJ — the Brazilian company tax ID — is in the footer and can be checked with Brazil's federal tax authority before any conversation. We sign NDAs too, using your template.
Tell us the problem. We'll say if we can solve it.
A first conversation with no obligation and no sales script. If this is not the right moment, we say that too.
You will be talking to this number: +55 11 99322-2315
Arnaldo Jairo Chanduvi answers — the same person who does the assessment and writes the code · Mon–Fri, 9am–6pm (Brasília time) · A reply the same business day. Not a bot.
We do not build brochure sites or off-the-shelf stores — those already exist and cost a fraction.