Custom software for businesses

Custom software is a system built around how your company actually operates: your processes, your rules and your integrations, instead of bending your operations to fit a generic tool. At RexDevs we build custom internal systems, CRMs and ERPs, automate manual processes and integrate the systems you already use, and we put in writing that the code is yours. We work from Mexico City with companies across the country.

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Updated November 10, 2026

When does custom software make sense?

It makes sense when generic software forces you to adapt: you end up patching gaps with spreadsheets, re-entering the same data in several systems or paying for licenses with features you don't use. It also makes sense when the way you operate is exactly what sets you apart and no tool on the market reflects it.

If an existing tool solves your problem well, we'll tell you: sometimes integrating it is all you need.

What do we build?

  • Custom internal systems, CRMs and ERPs.
  • Automation of manual processes.
  • Integrations with APIs, payments and existing systems.
  • Dashboards and reports.

How much does custom software cost?

It depends on the processes it covers, the users and the integrations. We start by understanding your operations and define scope, priorities and a clear estimate before we begin. That way you know what will be built, in what order and what it costs, without budgets that blow up halfway through the project.

Who owns the code?

It's agreed in writing before we start. Custom software is normally handled as a work made for hire: the economic rights are yours from the moment each deliverable is created, under article 83 of Mexico's Federal Copyright Law (LFDA), with no separate transfer needed afterward. If the product already existed or you prefer a lower cost, we use an assignment of rights or a license.

At delivery we identify the main open source components and their licenses, so you know what obligations they carry. That way you can sell your software, license it or show it to investors with no gaps in the chain of title.

How do we work?

Every project follows the same path, and you deal directly with the team that designs and writes the code, with no middlemen.

  • Understand: we listen to the problem, your users and your goals, and define scope, priorities and a clear estimate.
  • Design: prototypes you can touch and an architecture thought through before the first line of code.
  • Build: frequent releases you can test. You see real progress, not reports.
  • Launch: we ship with tests, monitoring and everything ready for real users.
  • Evolve: support, improvements and new features as your business grows.

Frequently asked questions

Can you work on top of a system I already have?

Yes. We can integrate with your current systems, automate on top of them or replace them piece by piece, whatever works best for your operations.

What if I want to switch providers later?

If the software was built as a work made for hire, the rights are yours and you receive the source code and its technical documentation, so you can continue with whichever team you prefer.

Do you provide maintenance?

Yes. We provide support, improvements and new features as your business grows, with a maintenance agreement if you need one.

What do you want to build?

Tell us your idea or your problem. We'll reply personally.

Let's talk