zShuck × design#01
Launch
Good for
New brands and products that need to look right and get found from day one.
Includes
- Brand identity
- Website or landing page
- SEO and GEO setup
- Analytics and tracking
Totalmade to measure
Services
AI agents, product and growth.On my own, or as the whole pack.
I'm the engineer in the room, and I care about what happens after launch. When you need more than code, I bring the product and brand designers I work with.
What I do
Four things, done properly.
- 01
AI agents in production
Agents that run real workflows in production, not demos. Wired to your tools and data, with evals, guardrails, human handoff and cost tracking. Claude, Gemini or OpenAI, whichever the job needs.
Claude · Gemini · OpenAI · MCP · Evals
- 02
Product engineering
From a rough idea to a product people use. MVPs, SaaS features and internal tools, built full stack, plus the product calls that come with shipping.
React · Next.js · Node · Ruby · Python
- 03
Growth engineering
Funnels, landing pages and onboarding that convert. Lead capture wired to your CRM, A/B tests, tracking and attribution, so every change shows up in the numbers.
Funnels · CRO · Leads · A/B tests · Analytics
- 04
Found by Google and by AI
Fast sites with clean structure and structured data, so they rank on Google and get recommended by ChatGPT, Gemini and Perplexity. Ask cecillorsan.es.
SEO · GEO · llms.txt · Core Web Vitals
AI agents in production
Agents that do the job, not the demo.
These are the agents I design, build and run in production. Each one plugs into the tools you already use and gets measured like any other part of the product.
agent.log
A simulated run. The real ones log a lot more.
A simulated run. The real ones log a lot more.
What production means
- Evals before launch and on every change
- Guardrails, permissions and PII handling
- A human in the loop where mistakes are expensive
- Tracing and monitoring for every run
- Cost and latency budgets per task
- The right model per job: Claude, Gemini or OpenAI
Built for
- SaaS
- E-commerce
- HR tech
- Fintech
- Agencies
- Professional services
- A-01
Customer support agents
Answer from your help center, docs and past tickets, take actions like refunds or bookings through your API, and hand off to a human with the full context when they should.
Zendesk · Intercom · WhatsApp · RAG
- A-02
Lead qualification and sales agents
Qualify inbound leads, enrich them with company data, score them, route them to the right person in your CRM and draft the first reply in minutes, not days.
HubSpot · Salesforce · Pipedrive · Enrichment
- A-03
Document and back-office agents
Read invoices, contracts, CVs and forms, extract structured data, fill your systems and flag what looks wrong for a person to review.
OCR · Structured output · ERP · Review queues
- A-04
In-product copilots
An assistant inside your SaaS that understands each user's data and takes actions through your own API, with their permissions.
Tool use · Streaming UI · Permissions
- A-05
Content and marketing agents
Multi-agent pipelines that research, brief, write and check content for SEO and GEO, with a person approving before anything ships. Like OG.
Multi-agent · SEO · GEO · Human review
- A-06
Internal knowledge and ops agents
Search and act across Notion, Google Drive, Slack and your databases. MCP servers so Claude, ChatGPT and your team's tools can use your systems safely.
MCP · Slack · Notion · Drive
Packs
Brand, product, code and growth. One team.
I work closely with product designers and brand designers, so you don't have to hire and coordinate three studios. Pick a pack or mix your own.
- zShuck × design#02
Product
Good for
Taking an idea to a product people actually use.
Includes
- Product discovery
- UX and UI design
- MVP built full stack
- AI features where they help
Totalmade to measure
- zShuck × design#03
Growth
Good for
Companies with traffic that want more leads and customers out of it.
Includes
- Funnel audit
- Landing pages and A/B tests
- Lead capture into your CRM
- Dashboards and attribution
Totalmade to measure
- zShuck × design#04
AI agent
Good for
Teams that want an agent doing real work, not another demo.
Includes
- Use case workshop
- First prototype in days
- Production agent with evals
- Monitoring and handover
Totalmade to measure
How it works
From first call to numbers going up.
- 01
Call
Thirty minutes to understand the problem, the numbers that matter and whether I'm the right person for it.
- 02
Prototype
Something working with your real data, fast, so we decide with evidence and not with slides.
- 03
Production
Built properly: tests, evals, monitoring and docs. Shipped in small, safe steps.
- 04
Grow
We measure, learn and iterate. Or I hand it over to your team, cleanly.
FAQ
Before you write
How much does an AI agent cost?
It depends on the scope and the integrations. Most projects start with a small, fixed prototype, so you see it working before committing to a full build. Running costs (model usage and hosting) are estimated upfront and tracked per task.
Claude, Gemini or OpenAI: which do you use?
Whichever fits the job. I usually test more than one model against evals built from your own cases and compare quality, speed and cost. Many production agents end up mixing models.
Can you work with our in-house team?
Yes. I can join your team for a project, or build it and hand it over with docs and a walkthrough so your team can own it.
What do the designers do in a pack?
The product designers own research, UX and UI. The brand designers own identity, naming and visual direction. I build it, wire it to data and growth, and keep everyone moving in the same direction.
Do you work outside Barcelona?
Yes. I work remote with teams anywhere, in Spanish, Catalan or English, and I'm happy to meet in person around Barcelona.
Got an idea?
Let's build something with personality.
Agents, products, funnels, a whole brand or a weird experiment. Tell me about it.