Custom software · Torreón, Mexico and remote

Custom software development built around how you operate

We design and build internal systems, portals and lean ERPs for companies that have outgrown spreadsheets and one-size-fits-all SaaS. We work on-site in Torreón and La Laguna, and remotely with teams across Mexico, the US, Canada and Latin America.

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Two developers building a custom system in front of monitors full of code
At a glanceMM·2026
Typical timeline
6–14 weeks
Team
Project lead, 2–3 developers and a UX designer
Tech
PHP 8 + MySQL, Supabase, Next.js
You get
Code, database and manuals in your name
Support
90 days included
Office in Torreón, Mexico · serving the US, Canada, Mexico and LatAm
What is custom software development, and when does it make sense?

Custom software is a system built around your company's exact processes, instead of bending your operation to fit a generic product. It makes sense when your team spends hours entering the same data into several spreadsheets, when no SaaS handles your business rules, or when per-seat licenses cost more than owning your own system. At Mercado Monkey a typical project ships in 6 to 14 weeks, with a working release every two weeks.

Almost every mid-size company we meet has the same symptom: a spreadsheet that grew into the central system, three people editing it at once and only one who knows how it works. It holds up until it doesn't: a row gets deleted, someone saves an old copy or the one person who understands it goes on vacation. Custom software development fixes that with a real database, user permissions, a change history and screens designed for the task each person does every day.

Mercado Monkey has built custom software from Torreón, Mexico since 2017: billing and collections systems, inventory and warehouse control, customer and distributor portals, quoting tools with pricing rules, KPI dashboards and lean ERPs that connect sales, purchasing and operations. One example is AguaMap, the customer registry, meter reading, cashier and billing system we designed for water utilities. We don't sell licenses or lock you in: the code and the database are in your name from day one.

We work in short phases. First we map the process with the people who actually do it (not just the director), then we ship a usable version within a few weeks and improve it with real use. If your team is outside Mexico, the process is the same over video calls: we serve companies in Monterrey, Mexico City, Houston, Toronto and Bogotá with the same bilingual team. And if your system also needs a mobile version or workflows that run on their own, we connect it to our mobile apps and automation services.

01Who it's for

Sound familiar?

  • Your operation runs on spreadsheets and WhatsApp

    Orders, inventory or collections live in duplicated sheets and in chats nobody can search. You need one source of truth, with a history of who changed what.

  • No SaaS fits your business rules

    You've tried two or three platforms and something is always missing: special rates, approvals by amount, tiered commissions or the report format your client asks for.

  • You pay for too many per-seat licenses

    You have 30 or 60 people on an expensive program and use only part of it. Your own system pays for itself in a few years with what you stop spending on licenses.

  • You want to give clients or distributors access

    A portal where they can check their account balance, download invoices, place orders or track progress without calling your office every time.

02What's included

What we deliver

Web app on your server

An application that runs in any browser, installed on your hosting or on our VPS with daily encrypted backups.

Roles and permissions

Admin, supervisor, data entry, sales: each profile sees only what it should, with an audit log of who changed what and when.

Dashboards and KPIs

Sales, collections, inventory or productivity in real time, filtered by branch, date and owner, and exportable to Excel.

Reports and documents

Receipts, quotes, purchase orders and cash-register reports as PDFs in your format, ready to print or email.

Integrations

Connections to Mexican e-invoicing (CFDI), WhatsApp, payment gateways, your CRM or your website through APIs and n8n workflows.

Code and documentation in your name

Repository, database, user manual and technical manual. If you switch vendors tomorrow, you take everything with you.

03Process

How we build it

  1. 01

    Discovery

    We interview the people who do the work, review your current files and decide what goes into the first release and what waits.

    Week 1
  2. 02

    Screen and data design

    A clickable prototype of the main screens and the database model. You sign off before we write a line of code.

    Weeks 2–3
  3. 03

    Development in releases

    Every two weeks you get a working version in a test environment so your team can use it and tell us what to adjust.

    Weeks 3–10
  4. 04

    Migration and training

    We import your data from spreadsheets or the old system, train each role and leave short manuals with video.

    Weeks 10–12
  5. 05

    Go-live and support

    We support the launch on-site in La Laguna or over video, and fix any bug at no cost for 90 days.

    90 days
04Comparison

Which option fits you?

Excel and shared sheetsGeneric SaaSWith Mercado Monkey
Fits your processYes, but with no controlYou adapt to the softwareBuilt on your real process
3-year costLow in dollars, high in lost hoursPer-seat licenses that rise every yearUpfront investment plus hosting, no per-seat fees
Permissions and historyNoneLimited to your planBy role, with a full audit log
IntegrationsCopy and pasteOnly what the vendor offersWhatever you need, via API or n8n
Who owns the dataYou, in scattered filesThe vendorYou: code and database in your name
Time to startImmediateDays to weeks6–14 weeks, with a release every two weeks
05Tech stack

What we work with

We pick tools for your case, not for hype: things you can maintain and scale.
PHP 8MySQL / MariaDBSupabase (Postgres, Auth, Realtime)Next.jsJavaScriptElectronSelf-hosted n8nDockerREST APIsCFDI 4.0 e-invoicingStripe / Mercado Pago
06Real projects

Similar projects

Water meters connected to pipes on a wall
Government & public utilities · Durango

Municipal water utility in Durango

The water utility of a municipality in Durango billed and collected payments for 18,400 service connections using Excel spreadsheets. We developed a web system with a customer registry, contracts, metered and flat rates, cashier stations, bills and past-due reports.

18,400service connections in the registry
Read the case study
Angle grinder cutting metal in a shower of sparks
Industrial distribution · Torreón, Coahuila

Corte & Acabado Industrial

Corte & Acabado Industrial distributes European-brand abrasives and tools to shops and plants across La Laguna, but its catalog lived in 200-page PDFs. We built an online catalog generated from a spreadsheet, with variants by grit and size and a button to request a quote on WhatsApp on every product.

+138%WhatsApp quote requests
Read the case study
Aerial view of a residential subdivision
Real estate · Querétaro, Querétaro

Grupo Cimarra Desarrollos

Grupo Cimarra sells homes in two subdivisions in Querétaro and received hundreds of leads a month from Meta and real estate portals that took hours to get a response. With n8n we connected every source to WhatsApp, the CRM and the sales agents' calendars.

47 sfirst contact (was 6 h 20 min)
Read the case study
07Related

Microapps and tools

MonkeyInventarioLightweight inventory synced with Google SheetsMonkeyCotizaQuote builder with catalog, PDF and follow-upMonkeyChecadorTime clock with fingerprint or QR and a payroll-ready reportMonkeyFacturaAutomatic CFDI 4.0 e-invoicing from your salesWebsite cost calculatorFree
08Where we work

Custom software development near you

Based in La Laguna, Mexico? See Custom software development in Torreón.

HoustonTorontoTorreónMonterreyMexico CityGómez PalacioLerdoBogotáAll cities →
09FAQ

What people ask us

How much does custom software development cost?
It depends on four things: how many modules you need in the first release, how many user roles there are, which integrations it needs (invoicing, payments, WhatsApp) and whether data has to be migrated from another system. That's why we don't have a list price: after a 30-minute call we send a phased proposal with scope, timeline and a fixed price, so you know exactly what you get in each release.
How long does a custom software project take?
A typical internal system takes 6 to 14 weeks. The first two go to discovery and screen design; from there we deliver a working version every two weeks. A portal or a lean ERP covering several departments can go in phases: you start with the module that hurts most and add the rest while your team is already using it.
Do I own the code and the data?
Yes. From day one the repository and the database are in your company's name, and at handoff we deliver a technical manual and a user manual. We don't charge per-seat licenses or require you to stay with us. Most of our clients keep a maintenance plan because it's worth it, not because they're locked in.
Why build custom software instead of using a SaaS?
If a SaaS covers almost all of your process, use it: it's faster and cheaper. Custom software makes sense when your business rules are exactly what sets you apart, when you need to connect several systems that don't talk to each other, or when the accumulated cost of per-seat licenses exceeds what your own system would cost over two or three years.
Do you only build software for companies in Torreón?
No. Our office is in downtown Torreón, Mexico, and we meet in person with companies in Torreón, Gómez Palacio, Lerdo and Matamoros. We also develop remotely for clients in Monterrey, Mexico City, the United States, Canada and Latin America, with video meetings, a shared progress board and a team that works in English and Spanish.
What happens after the 90 days of support?
You can sign up for a monthly maintenance plan with hours for improvements, security updates, backups and monitoring, or request changes as projects when you need them. If you'd rather have your in-house team maintain it, we do a technical handover with code review sessions and architecture documentation.
Can the system connect to my invoicing, WhatsApp or accounting?
Yes. We integrate CFDI 4.0 e-invoicing (Mexico's electronic invoice) with your authorized provider, receipts and notifications through the WhatsApp Business API, payments with Stripe or Mercado Pago, and exports for your accounting software. When the other system has no API, we use n8n on our servers to move data on a schedule, with a log of every run.
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