Tell me what you want to build and I'll tell you if it's worth it.
My agent helps you work it out in a few minutes and proposes phases with final prices, so you never have to pay for everything at once.
You're talking to an AI. Don't include personal data or third parties' confidential information.
Who I work with
Agencies and consultancies
You sell an AI project and need someone to build it. I work under your brand, in your tools and under NDA. Your client sees your team.
How I work with agenciesStartups and product teams
There is an AI feature on your roadmap and nobody free to build it. I join for a few weeks, or a few days a week, and we ship it with your team.
Tech leads at established companies
You have internal processes an agent could handle and systems nobody wants to touch. I take care of the analysis, the integration and the rollout.
Run a small business and want to automate tasks or get a website that brings you customers? I work with small businesses too.Services for businesses
Services
Every project starts with a call and a proposal within 48 hours: scope, timeline and a fixed price.
AI agents and orchestration
Tool-using agents, RAG over your documentation and multi-step flows with LangGraph. Each one ships with an eval suite, so you know it answers well before real users see it.
2 to 4-week sprint, fixed price
Product engineer on your team
I work in your repo, your Jira and your Slack. I have a say in what to build and in what order, and then I build it.
Days per week or monthly retainer
White-label work for agencies
I build the project you sell, under your brand and under NDA. If needed, I join meetings with your client as part of your team.
Per project
AI project audit
Your agent makes things up, is slow or costs too much. In one week I measure where it fails and hand you a plan to fix it.
1 week, fixed price
What I bring
Integration with real systems
I've connected hotel PMSs such as Sihot, Mews, Cloudbeds and Apaleo, ERPs on Business Central, SOAP/XML services and payment gateways. That's where many agent projects get stuck.
Consultancy experience
Two years at Devoteam doing technical leadership, requirements gathering and client work on pharma, banking, energy and hospitality projects. I know how an outsourced project works from the inside.
A product of my own in production
I designed Hospitality RMS, a revenue management system for hotels, from requirements to infrastructure. It has been running at an aparthotel since March 2026.
Agents you can measure
Every agent ships with an eval suite, per-answer traces of latency, tokens and cost, and a spending cap. Before launch you know how often it gets things right and what it costs.
How I work
Call
30 minutes to understand the project. I tell you whether I fit.
Proposal
Within 48 hours: scope, timeline, fixed price and what I'd leave out of the first version.
Build
A demo every week. I work in your repository from day one.
Production
Deployment, agent evals, monitoring and documentation for your team.
After launch
Support, improvements or a full handover to your team, whichever you prefer.
Work
Many of my projects are signed by the agency that hired me, so I describe them here without names.
Hospitality RMS, revenue management for independent hotels
A system that forecasts demand and recommends prices and stay restrictions, connected to six PMSs and two channel managers.
AI technical sales advisor for a B2B online store
An agent that finds products, checks live price and stock, calculates materials and drafts quotes, citing the data sheet behind every figure.
Custom CRM with a virtual setter for a sales team
A CRM with an AI setter that answers every lead within minutes, qualifies them and books the sales call. Plus a proposed voice agent to talk to leads and handle support.
Audit of a support assistant that made up answers
One week to measure where a RAG assistant was failing, why it kept getting more expensive and what to fix first.
What I work with
- AI
- LangGraph, LangChain, Claude API, OpenAI API, RAG with pgvector, Evals and tracing
- Backend
- Python and FastAPI, Node, NestJS and Hono, Java and Spring Boot, PostgreSQL, Redis and queues
- Frontend
- Next.js, React, Astro, Angular
- Integrations
- REST, SOAP/XML, OData, Webhooks, Stripe, GoHighLevel, n8n
- Infrastructure
- Docker, GitHub Actions, Hetzner, AWS, Azure, Cloudflare
About me
I'm Jesús García Terrón, an independent product engineer in Valencia, Spain. I've spent five years on consulting and product projects, and now I work with agencies, startups and companies as Red Moon Consulting.
I get involved from the moment we decide what to build: the scope, what goes into the first version and how it fits with what already exists.
More about meQuestions
How much does it cost?
It depends on the scope. After the call I send you a fixed-price proposal within 48 hours. If I'm embedded in your team, I bill by the day or with a monthly retainer.
Do you sign NDAs and work white-label?
Yes. I sign the NDA before seeing the project, and I never mention an agency's clients without permission.
Who owns the code?
You or your client do, from the first commit. I work in your repository and leave documentation so anyone can pick it up.
How do you invoice?
As a self-employed professional registered in Spain. If your company is in another country, we settle the details in the proposal.
Do you work in English?
Yes. Meetings, documentation and code in English or Spanish.
When can you start?
It depends on my workload at the time. I give you a specific date on the call.
Tell me about your project
A 30-minute call, no strings attached. If I'm not the right fit, I'll tell you.
Or email me at hola@redmoonconsulting.es