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COSTANEXA SOFTWARE ENGINEERING

Your operation already has rules.
The software should follow them.

We design and build tailor‑made systems for companies operating in Mexico. No templates, no modules you never open.

Seven systems in production today · point of sale · hotel PMS · case files · chargebacks

We answer within one business day, with nothing attached. We work in English and Spanish.

Services

What we build

Four lines of work. All four start the same way: understanding how your people work before a single line of code gets written.

01

Management systems

Operations, inventory, collections and account statements. Built on the way your company actually runs, not on a generic model of it.

02

Hospitality platforms

PMS and revenue tools for hotels and condo‑hotels: bookings, occupancy, owners and the monthly payout each one is owed.

03

Document management

Digital case files with version history, search and access you control, for law firms, accountants and corporate teams.

04

Migration and integration

We get your data out of the system you are stuck with, and connect the tools you already pay for so they stop working in isolation.

Samples

What a tailor-made system looks like

Four sample screens, from four different systems. They are here to show the shape of the thing: on a real project, each one is drawn around the operation of whoever has to use it. The data is invented.

Hotels and condo-hotels

Booking calendar

One row per unit, one column per night. Selling a lock-off blocks the units inside it, and the other way around too: two bookings never land on the same night.

Shops, restaurants and bars

Point of sale

Charging at the counter with stock coming down in the same movement, and the drawer reconciled at closing without anyone adding up receipts by hand.

Sales and services

Customer follow-up

Every deal in its stage, with what was promised, who promised it and when to call back. Nothing lives inside one person's head.

Teams in the field

App on the phone

For the people who work on their feet: the housekeeper, the technician, the driver. What they capture on the phone shows up on the office desktop the moment they tap it.

We also build accounting and invoicing, case files for law firms, staff and attendance control, document management, assistants that answer on WhatsApp, and integrations with the systems a company already runs. If your line of work is not on this list, that is usually a good sign: it means no off-the-shelf product fits it.

In production

In production today

These are not portfolio pieces. They are our systems opening every morning, with real users and real data.

running Café con Ángel Point of sale, inventory, costed recipes and shift close-out for a two-location coffee shop, plus its public site.
running Custodia Revenue End-to-end handling of chargebacks and bank disputes for merchants: prevention, evidence and recovery.
running CoNexa Hotel Suite PMS for hotels and condo‑hotels: front desk, bookings, folios, cashiering and the restaurant point of sale, with owner payouts, an Android app for staff, a link that lets agencies request bookings, and a watchdog that checks the books every 15 minutes.
running Archivo Digital Case file management for a legal and accounting firm, with access granted user by user.
running HR management Staff control: onboarding, attendance, payroll and a complete file on every employee.
running CostaNexa Weddings Bilingual wedding websites: every guest opens their own invitation and RSVPs from it, while the couple watches the list fill in.
running Party invitations Digital invitations for kids' parties, each theme with its own mini-game; every family RSVPs on its own and the hosts see and export the list.
running Mis finanzas Personal finance app for Mexico: reminders before every bill is due, SAT invoices downloaded automatically with the e.firma, and bank statements reconciled.
running Vatia App that forecasts the CFE electricity bill before it arrives.
running WhatsApp booking Booking system for a beauty salon with a WhatsApp assistant: clients book, confirm and reschedule by message, at any hour.
running Sports league League app: live scores, schedule, standings and every game scored from the field.
running Real estate portal Client portal for a real estate firm, with role-based permissions and two-factor sign-in.

Each one grew out of a different operation. Not one of them is the same system wearing a different logo.

Questions

What companies ask before we start

The questions that come up on the first call, answered before you have to ask them.

01How long does a system take?

It depends on the scope, which is why the first job is to narrow it down. We do not hand over the whole system at once: the part that solves the most expensive problem goes into production first, gets used with real data, and the rest is built on top of that. The operation starts getting something useful long before the project ends.

02Who owns the code and the data?

The client does. The database can be exported in full, in a format another provider can read, whenever it is requested, and we document how it is organised. If one day you decide to work with someone else, we hand over what is needed to make that move possible.

03How do you charge?

By defined project and in stages, not by open hour. Before quoting we talk to the people who run the process every day, because the price depends on the real scope rather than on a list of features. We discuss the detail privately, with the context of each operation in front of us.

04What if my operation changes later?

It adapts. A custom system is built on business rules that live inside the process rather than scattered through the code, so changing them does not mean rebuilding everything. Operations changing is normal; the system has to be able to follow.

05Do I have to drop the systems I already use?

Not necessarily. If invoicing, the point of sale or accounting already work, integrating them is usually wiser than replacing them. Before proposing anything we look at what is worth keeping.

06How do I know if I need a system or a spreadsheet is enough?

The signal is not company size, it is repetition: when the same figure gets typed in three places, when month-end close is spent reconciling differences, or when the operation depends on one person being available. If something simpler solves it, we say so, even when that means a smaller project for us.

Contact

Let's talk about your system

Tell us which part of your operation is eating your time. That is enough to start.