As published, invoicing software used in Portugal must be certified by the tax authority (AT) under Portaria 363/2010, invoices carry an ATCUD and a QR code, and monthly SAF-T (PT) billing files are due by the 5th of the following month. That is as published — confirm current rules with your tax or legal adviser. For a company that wants a custom internal tool, this sets a hard boundary on scope.
LATYNEX Digital builds internal tools that respect that boundary. This page covers that work for Lisbon businesses. The general service is at Internal Business Tools, and the market overview is at LATYNEX Digital for businesses in Lisbon.
Typical industries
- Tourism, hospitality and short-stay operators
- Software and remote-first tech companies
- Trade, import and distribution
- Real estate and property services
- Creative studios and agencies
- Professional services serving international clients
Common lead-handling problems
- Teams tempted to issue invoices from a custom tool, which is not permitted unless certified
- Data copied by hand from spreadsheets into the certified invoicing system
- Internal records that are hard to reconcile with the monthly filing
- Quotes and approvals scattered across email and messaging apps
Direct answer
If your Lisbon team runs orders, quotes, approvals or stock through spreadsheets and messages, LATYNEX designs and builds an internal tool for that process. The tool prepares and reconciles data. Your certified invoicing system issues the invoices. We scope the tool to stop at that line.
Why the global internal-tools page is not enough for Portugal
The global Internal Business Tools page describes what such a tool can cover. In Portugal one function is separate: issuing invoices. Because certified software is required for that, the sensible design keeps invoice issuing out of the custom tool altogether and treats the certified system as a neighbour. That boundary shapes the data model, the screens and the export, so it belongs in the first scoping conversation, not at the end.
What the tool does on your side of the line
Typical modules are chosen from your real process rather than a fixed feature list.
- Order and quote intake with an approval step and a clear status
- Stock or job tracking tied to the same record
- A prepared, checked data set ready to be entered into or imported by your certified system
- A reconciliation view comparing internal records with what was invoiced
- Roles and permissions so each person sees only what they need
Access, ownership and integration
You own the tool, its data and the hosting account; we document how it runs. To connect it to your certified invoicing software we need to know whether that product offers an API, an import format or neither. Connections are scoped per project, through an API or webhook where the system supports it, after technical review; where it supports neither, the honest answer may be a checked export that a person imports.
What we do not do
LATYNEX does not hold AT certification, does not issue invoices and will not build a feature that does, does not generate ATCUD codes or SAF-T files as a substitute for certified software, does not give tax advice and does not deliver in Portuguese. Your accountant or tax adviser decides how the monthly filing is handled.
How delivery actually works
LATYNEX Digital has no office in Lisbon and does not claim one. We work with Lisbon businesses remotely, over video calls and written updates, in English, with the same team and process as in every other market.
Questions
Do you have an office in Lisbon?+
No. We work with businesses in Lisbon remotely, over video calls and written updates, in English, and we do not imply a local presence.
Can the tool issue our invoices?+
No. As published, invoicing software used in Portugal must be certified by the tax authority. We build the internal tool around your certified system and do not issue invoices from it.
Do you produce our SAF-T file?+
No. Filing stays with your certified system and your adviser. The internal tool can help reconcile your records against what was invoiced, and we do not give tax advice.
Will it connect to our current invoicing software?+
We do not promise a prebuilt connector. It is scoped per project, through an API or webhook where the system supports it, after technical review, or a checked export if it does not.
How are you invoiced, and in what currency?+
In EUR, by Latynex Trade OÜ, a company registered in Estonia (EU). Tax treatment for a client in Portugal is confirmed on the quote, and we do not give tax advice.
What happens next
- 01
We talk through what you need
The problem, the people who will use it and what runs it today.
- 02
We write the scope
What is built first, what is deliberately left out and what needs a decision from you.
- 03
Price agreed in writing
One price for that scope, approved by you before any work starts.
- 04
We build in stages you can review
You see working software along the way, not a reveal at the end.
- 05
Test, hand over, document
Your code, your accounts and your domain, with documentation that lets someone else run it.
Who you would be working with
- Company · Who you would be working with
- LATYNEX Digital is a service line of Latynex Trade OÜ, a company registered in Estonia (EU). Contact: info@latynexdigital.com.
- How we work · Delivery
- Remote, in English, with the person who would run the project. No local office is implied in any market.
- How we work · Commercial terms
- One scope and one price, agreed in writing before work starts. Your accounts, code and domain stay yours; any access we use is granted by you and can be withdrawn.
There are no client case studies on this page, and none are implied. What LATYNEX has built and runs itself is on the portfolio, each system labelled by stage. Published prices are on the pricing page; anything not listed there is scoped and quoted after review.