Custom Software Development in Spain
3XA is a custom software development company based in Spain. We design, build and maintain software for businesses that need their own product: web applications, APIs, SaaS platforms, mobile apps and AI integration. The same engineering we use to run Projekt, Learn and 3xAI is what we put to work for your project.
Request a free diagnosisWhat is custom software development?
Custom software development means building an application specifically designed to solve the exact problem of an organisation, rather than adapting a generic product. The architecture is designed, the most appropriate technology stack is chosen, and the product is built piece by piece around the business.
For companies with specific workflows, proprietary integrations or particular security requirements, custom software is not a luxury — it is the only option that truly works in the long run.
Technologies: web, API, SaaS, mobile and AI
We choose the stack based on the problem, not trends. We work with PHP/Laravel, Python/FastAPI, Next.js and TypeScript. For data: PostgreSQL, MySQL and Firebase. Deployments on cloud infrastructure with Docker and CI/CD. For AI projects we build on our 3xAI platform or directly on leading model APIs, adding RAG, agents and multi-model orchestration.
- Backend: PHP / Laravel, Python / FastAPI
- Frontend: Next.js, React, TypeScript
- Data: PostgreSQL, MySQL, Firebase
- Infrastructure: Docker, CI/CD, cloud
- AI: 3xAI, OpenAI, Anthropic, RAG, agents
Our process: from diagnosis to production
We never write code before understanding the problem. We start with a free diagnosis, then propose a concrete scope, justified stack and budget. Development is iterative: short sprints, working software every one to two weeks. After launch we offer maintenance, monitoring and continuous development.
Why choose 3XA as your software development company
We are a software company with our own products in production — Projekt, Learn and 3xAI. We know what happens after a launch because we live it every day. Full ownership of code and IP. No hidden dependencies. We have worked with Tipsterland, Kickverse, Bettingram and the DGT (public sector), among others.
Frequently asked questions
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View serviceShall we talk about your project?
Start with a free audit: we review your situation and tell you honestly what makes sense to build and how. No commitment.
Request a free diagnosis