Gabriel Sandoval
Co-founder · Systems engineering, AI and delivery
Leads the engineering of the systems we deliver: AI agents, automation and custom development. Responsible for technical delivery and the quality of every deployment.
Engineering boutique. Barcelona.
Not a consultancy, not an agency, not an IT shop.
Nexus looks at the whole company.
We analyse the company from the ground up and then build: custom software, connected machines, AI agents, web and SEO, and B2B training.
Never more than seven clients at a time · NDA from the first contact · The code is yours
The first step is always the same: an NDA signed before we see anything. Then the Nexus team analyses your operation.
Who we are
Nexus is two people.
Nexus is two people.
And both of them will be on your project.
We read every application, sign every NDA and deliver every project in person: custom software, AI agents, training and business growth. That's why the seven-client limit isn't marketing — it's our calendar.
Antonio J. Guillén
Co-founder · Strategy, client relationships and sales
Leads the conversation with leadership teams, the diagnostic meetings and the relationship with every client. Responsible for turning every commitment into measurable impact.
Why Nexus
The honest comparison
The honest comparison
with your alternatives.
Hiring someone in-house
It takes months to become productive, it's a fixed cost every month and, if they leave, the knowledge leaves with them.
With Nexus
A system is delivered once and it stays. The knowledge lives in the architecture, not in one person.
Using ChatGPT directly
It answers questions but doesn't act: it doesn't invoice, schedule, integrate with your tools or get supervised.
With Nexus
Our automations and agents run complete processes, integrated into your stack and supervised by the Nexus team.
Another agency
They sell hours and loose deliverables: the structural incentive is to stretch the project, and you depend on them for every change.
With Nexus
We deliver systems that work without us. The code and the data are yours, with no vendor lock-in.
A freelancer
A single point of failure. If they disappear or get overloaded, your operation stops.
With Nexus
Two founders, documented architecture and ongoing operation included in every implementation.
Where we fit
Built for operations
Built for operations
that are serious about running better.
We don't publish case studies yet — NDA from the first contact — so this is what we can state: which sectors we are built for and which tools we work with.
Sectors
- Pharmaceutical
- B2B logistics
- SaaS
- Financial services
- Mid-market e-commerce
- Manufacturing
Our stack
- OpenAI
- Anthropic
- Vercel
- Supabase
- HubSpot
- n8n / Make
- TypeScript
- Python
+ whatever your operation needs — we're not stack maximalists.
Before we talk, read
How we work,
How we work,
explained in writing.
Nine long-form guides and a blog with more than sixty articles, currently in Spanish: how everything we do works inside, without hype and without selling along the way.
AI agents
Enterprise AI for B2B companies: the complete guide
Custom software
Custom enterprise software: when to replace ERP and CRM with your own system
AI agents
AI automation by department: how to build a real agent for one area
Diagnosis
Strategic diagnosis: what a real diagnosis is and what it isn't
B2B training
Corporate AI training: how to train your team in applied AI
Project rescue
Rescuing stalled projects: software, AI, ERP and digital transformation
We also do web design and redesign, SEO, e-commerce and branding, always within an analysis of the whole company. If you're looking for a custom software company in Barcelona, a custom ERP or AI consulting in Barcelona (a technology partner that analyses and builds, not an agency), if you're wondering where to start automating your company (ES), or you want to know how much custom software costs or how much an AI agent costs, we've written it down with figures.
Before you ask.
Why only 7 clients at a time?
Because the Nexus team delivers the work directly. We don't hand your company to a junior account manager, and that has a physical limit. When the slots are full, we don't take anyone else — whoever it is.
What happens to my data and internal information?
An NDA signed before we see anything. It's the first step, not an extra you have to ask for.
Do you work with companies my size?
This service is designed for companies with 20 to 500 employees. For small businesses and freelancers in Spain there's a separate line with a single AI agent — with its own capacity: it doesn't take one of the 7 slots.
How much does it cost?
Software and business growth are quoted individually, after the NDA and the analysis — quoting earlier would be lying to you. Training starts at €1,500 per person.
What happens after I apply?
The Nexus team reads your application and replies. If there's a fit, the next conversation starts with an NDA and ends with a full analysis of your operation.
How we start
Everything starts
Everything starts
with an NDA.
Before you show us anything, we sign. Then our team looks at your operation properly. Whatever the service, the first step is the same.
-
Day 0
NDA signed before you show us anything. Your information doesn't leave the room.
-
The analysis
An analysis of your operation, carried out by the Nexus team. Not by a junior with a checklist.
-
Delivery
A report with the exact changes, prioritised by impact on your P&L.
-
Then
You decide. No commitment until you say so.
Limited availability
We don't work on volume.
We don't work on volume.
We work with precision.
7 clients at a time, maximum. Or, if you'd rather start on your own, take the questionnaire we use in our analysis.
Premium track
Apply for a slot.
We assess the fit before we start. Under NDA, with a reply within 24 business hours.
Apply →7 clients at a time, maximum · No commitment
Open questionnaire
Audit yourself first.
The 50 questions we use in our strategic analysis. Direct download, no email required.
Download the questionnaire (PDF, in Spanish) →50 questions · 10 dimensions · A4