Custom development
We develop using the right technology for each project, creating completely new tools from scratch.
Software engineering company founded in 2004
Custom software and artificial intelligence development
We develop web and mobile applications, automations, and artificial intelligence for businesses. We work in phases, each with a fixed quote agreed before it starts.
Software development, AI, and consulting services
Software engineering to adapt technology to your company: developing it from scratch, adapting a tool that already exists, adding artificial intelligence, or starting with consulting to decide what is best.
Customizable software
We build upon existing tools, extending and customizing them with tailored development.
Artificial intelligence
Automate the complex and speed up your processes with AI solutions that are genuinely custom-built.
IT consulting
We analyze your current situation, conceptualize ideas, and provide expert guidance to bring them to life.
From near Barcelona, we develop custom software and AI
More than 20 years approaching every project with the same attention to detail.
AI to accelerate, professionals to decide
We bring AI into our development process, always supervised by our professionals.
Remote development and consulting, in Spain and abroad
We take on development and automation projects for clients at home and internationally.
On-site consulting in Catalonia
We travel for the initial strategy and digitalization sessions, when sitting down at the table changes the outcome.
20+
Years of experience
200+
Projects delivered
We help companies implement artificial intelligence
Integrate artificial intelligence into your company's processes
As a software development company, we don't just follow the latest in artificial intelligence: we apply it in business tools, web applications, apps, and process automation, integrated into the programs your team already uses.
How a project with Gilsys starts
From the first contact to the first phase in production, in four steps. The details are in how we plan a project in phases.
- 1
A free indicative quote
We agree on the requirements and give an indicative valuation of the project. Working out the cost of some projects is complex: see the factors that go into a quote.
- 2
A proposal with the scope and initial price closed
We work out what goes into the first phase, the cost, and the plan. Medium and long-term projects are split into an MVP and phased planning.
- 3
Development you can verify as it goes
We set up a test environment where we show the stages of the project as they are completed.
- 4
Go-live and next phase
We deploy the first phase to production and, if required, we define and move on to the next one.
Why choose Gilsys: five commitments you can verify
Working principles applied the same way to small projects and to large developments.
Direct contact
The person you deal with knows the architecture of your project and coordinates the development team directly. What is agreed in a meeting reaches production with no commercial distortion and no middlemen. And the same people answer after delivery.
No vendor commissions, no bias
We do not resell licenses and we take no commission from any vendor. If the best answer is to make better use of what the company already has, or to solve it without AI, that is what we will recommend.
Technical judgment: we only take on what we master
If we are not 100% sure we can guarantee an excellent result on a project, we say so openly and we do not take it on.
Business judgment: we tell you when a project is not worth it
If during the analysis we find the idea is not viable, or that the cost does not justify the real benefit to your company, we explain it. We do not bill hours on developments that will not add value.
Transparency on pricing
We explain which factors determine the price of each phase: from the complexity of the architecture to the criticality of the data.
What do our clients think?
From Gilsys: thank you for your trust.
Gilsys helped us create our new corporate website and the result has exceeded our expectations. A professional, approachable and very agile team. They met the deadlines and understood exactly what we needed. Highly recommended!
From the very first moment, the Gilsys team understood our needs and turned our vision into a modern, clear website in line with our identity. We particularly value their technical ability, their close communication and how quickly they responded to every change or suggestion during the project.
Sébastien Bombart
CTO · Xpeer
At Edryx Healthcare we work regularly with Gilsys on custom platforms and digital solutions for different projects in the healthcare sector.
We particularly value their ability to understand the functional needs of a project and turn them into viable, agile and well-resolved technical solutions. They are an approachable team, quick to respond and especially proactive in looking for alternatives when new requirements or incidents come up.
Beyond the technical quality, for us it is especially important to work with a supplier that knows our projects, gets involved and brings real solutions. Gilsys has become a technology partner we trust at Edryx.
Xavier Oleart
Project & Strategy Director · Edryx Healthcare
We have worked with Gilsys on several software development projects. They have delivered every one of them with a high level of professionalism and a real commitment to service.
Genís Rivera Márquez
General Manager · Soldatal
We have developed a product with them for the public administration I work for and we are delighted. They are very professional, resourceful, flexible, in short, recommended 1,000 x 1,000
Meritxell Serveto
Coordinator of activities and strategic projects · Ajuntament de Castelldefels
Very approachable and professional, they help you with everything you need and they make the project you have in mind a reality. The best choice we could have made.
Nil Murfulleda
Co-founder · Futbol Revolution
A very good experience. They built custom software for the company and we are delighted with how it works and with their advice. Jordi always responds with good solutions and does so efficiently. They understand your need and your goal straight away and implement it brilliantly and at a reasonable price. Thank you.
Héctor Núñez
Manager · Aquaplant Disseny Verd
A very good experience with the CAIRÓ Reformes website. They understood what we wanted from day one, they met the deadlines and they were always available. A professional team, 100% recommended.
Justo Trillo Jiménez
Manager · Cairó Reformes
I have been working with them for years and they have always proved to be very professional and resourceful. Whenever I need them, they are there and they give me a quick answer. I would especially highlight Jordi's work, for his attention, his availability and his ability to find solutions. It is a pleasure to be able to count on trustworthy professionals like him. Highly recommended!
Olga Sánchez
Director · Autoescuela Santos
Gilsys is a serious, efficient, and trustworthy software development company. At AWAAIT we had their support to extend the features of a mobile app for iOS and Android, on very tight deadlines. They delivered everything we had agreed on, and even ahead of the planned date.
Working with their team is easy: they know how to adapt to your needs and to the project's requirements. We were so happy with that first collaboration that we hired them again for a further change to the system.
Adrià Vicens
Chief Operating Officer · AWAAIT
Industries we work with
IT cuts across industries: the data, processes, and regulations change from one to another, which is why every project starts by understanding them.
Manufacturing
Product information in a PIM, unified plant data, and alerts powered by artificial intelligence.
Public sector
Custom tools to coordinate departments and automate administrative procedures.
Nonprofit organizations
Querying internal documentation with a private AI, without the data leaving the organization, and a virtual office on their own servers.
Healthcare
Web tools for medical centers: appointments, medical records, and inventory control.
Education
Custom online training platforms with advanced assessment systems.
Retail
Online stores connected to invoicing, the ERP, and the catalog.
Marketing
CRM to manage clients, synchronized sales data, and integrated digital tools.
Management
Dashboards to analyze company data and make decisions based on it.
Startups
From MVP (minimum viable product) to final version, with a limited first phase that goes into production, and the rest is decided based on data.
Laboratories
Advanced algorithms and calculation tools, with artificial intelligence when it adds value.
Technology
Online tools and mobile apps with Bluetooth, AI, or custom APIs.
Corporations
WordPress or high-performance corporate websites, with custom design.
Frequently asked questions before commissioning custom software
How much does it cost to develop custom software?
There is no standard price: it depends on the scope, the integrations, and whether the project starts from an existing platform or from scratch. That is why it is quoted in phases, each with a fixed price, and the first conversation and the quote are free. You can see all the factors that determine the price.
What is the difference between development, consulting, and artificial intelligence integration?
You do not need to classify your needs: they become clear in the first conversation. As a guide, if it is clear what needs to be built, it is custom development; if the right solution has to be defined or an idea turned into a project, it is consulting; and artificial intelligence fits when documents need to be read or generated, information classified, or questions answered with the company's data.
Do you use artificial intelligence for programming?
Yes, but responsibly. Our team reviews the AI's suggestions before they are accepted, based on its knowledge and experience. When the AI reduces the hours a task takes, the client benefits from it in the quote.
What happens if we want to switch providers one day?
It can be done without starting from scratch: the code of 100% custom developments belongs to the company and is documented, so another team can continue working on it.
Articles on custom software and artificial intelligence
Go to the blog »Vibe coding: what it is and the real risks of using it without supervision
It makes it possible to build tools by programming directly with AI, without writing or understanding the code. Suitable for testing an idea, but with real risks in production.
Jev: the fast, affordable AI model that decides
Jev, by TypeSafe AI, receives data and returns the best option with its confidence level. We analyze what it brings and where it fits in automations, agents, applications, and data, with a real use case.
Custom Module Development for Prestashop
Discover how Gilsys, Prestashop experts, program custom plugins to adapt your store to your business needs.
Custom Module Development for WooCommerce
We program custom plugins for WooCommerce, an e-commerce platform we are experts in, to tailor your online store.
Thinking about building a custom project or integrating artificial intelligence?
Tell us what you need. The first conversation is free and, if you ask, we can sign a non-disclosure agreement (NDA) beforehand.