Custom software — quoted
Quoted after a conversation. Internal tools, booking logic, operator inboxes, integrations — scoped in writing, owned by you. Not a lakehouse SKU, not an Operating Layer, not a US-vendor landing team.
Internal tools, customer portals and workflows — owned by you, documented
Quoted after a 30-minute discovery — fixed scope, milestones, one number
First working build in weeks; you watch it grow every Friday
Senior engineers plus an agent factory; a named technical lead signs the architecture
Yerbabuena Digital builds custom software for Southern European SMEs: internal tools, booking logic, operator inboxes, quote workflows and integrations, sometimes with lightweight agents inside. An agent factory gives speed; senior engineers review what ships; your team approves anything that reaches a customer.
By Friday of week 1: a running skeleton on representative data, the architecture decisions logged in git, and a clickable preview of the one workflow you described in discovery.
Building your system
The same rule, twice
Running your system
What we build
Pick one system or connect several. Always scoped in writing, always yours at handoff.
Job queues, order boards, client portals and dashboards shaped around how you actually work — role-based access, audit logs, mobile-friendly.
We replace the glue work between tools you already pay for: inquiry triage, document routing, reminders, reconciliations — with a human approving every consequential step.
Lightweight agents that research, draft and classify inside your system — with approval gates, evaluation before launch, and traces you can read. Never customer-facing autopilot.
CRM, spreadsheets, calendars, ERP exports, data platforms — connected with the fewest moving parts that will last. MCP and plain APIs where they help, not framework theater.
We build and hand over systems you own. We don't resell chatbot subscriptions, and we don't sell packaged governance platforms.
| In scope | Internal tools, customer portals, workflow automation, lightweight agents with approval gates, integrations, runbooks, training, handoff |
|---|---|
| Out of scope | Chatbot subscriptions, packaged governance platforms, resold licenses, 24/7 managed operation, anything customer-facing without a human gate |
The factory
AI where it saves weeks, seniors where it saves projects. Every Friday you see the branch running — not a status slide.
A 30-minute call, then we map the job: tools, data, risk, the ritual your team repeats daily.
Artifact: Written scope, milestones, one fixed price.
The factory scaffolds the system on representative data. Seniors set the architecture and the security boundaries by hand.
Artifact: A running preview you can click.
Agents write tests, drafts and refactors; every merge passes senior review. Friday demo, your feedback lands Monday.
Artifact: A changelog in plain language, weekly.
Hardened build, credentials, runbooks and training. Care starts at go-live; after handoff, you can cancel and run it yourselves with the documentation.
Artifact: A system your team operates without us.
A repair shop runs jobs on paper and WhatsApp. The build: one queue with job status, parts notes, and drafted customer SMS a person approves. Where the value comes from: the owner stops re-typing the same three messages forty times a week, and no follow-up gets lost between two apps. Where it wouldn't pay: if the shop handles five jobs a week, a shared spreadsheet is the honest answer — and we'd say so in discovery.
If we part ways after week 1, you keep: the skeleton repo, the architecture decisions log, and the written scope with milestones. You owe nothing further.
The factory isn't a metaphor — this site, its agents and its publishing pipeline are built and operated the same way, and the colophon shows the wiring.
Yerbabuena Digital grew out of Yerbabuena Software, a University of Málaga spin-off from 2005 — a separate company, same family, same town. Our technical lead, Antonio de las Nieves Stoner, has spent about twenty years running enterprise workshops, PoCs and first deployments — including Oracle Iberia, the first sales-engineering hire at Promethium, and buyer-facing architecture at Quantexa and Waterline Data, with around seven years operating in Silicon Valley. That is career history, not a Yerbabuena Digital client list — we keep those separate on purpose.
| Discovery | Bárbara Trujillo (client lead) |
|---|---|
| Architecture review | Antonio de las Nieves Stoner (technical lead) |
| Friday demo | Antonio de las Nieves Stoner (technical lead) |
| Handoff | Bárbara runs the handoff; Antonio walks runbooks if needed |
How this page was made: drafted by an agent from the spec, reviewed by a senior engineer, copy-edited in English, Spanish and French, and shipped through the same approval queue we sell — a person pressed send. The full wiring is in our colophon
To end the engagement: the handoff docs, repo, credentials and runbooks are yours at handoff. Care runs through go-live and handoff, then is cancellable by email any month. We don't hold your data or your domain.
After discovery you receive scope, milestones and one fixed number in writing. Changes go through change control — agreed before they're built, never invoiced as a surprise.
No — it's software you own, which sometimes has agent steps inside. When an agent is involved, it drafts and a person approves.
Not toward your customers. Agents research, draft and classify; approval gates sit before anything customer-facing or contractual. Logs and traces are part of the build, not an add-on.
Bárbara Trujillo is the founder and your client lead. Antonio de las Nieves Stoner is the technical lead who signs the architecture — his credentials are on our About page, and he joins the technical calls on Zoom.
Yes — calendars, messaging, Stripe, spreadsheets, CRMs and data platforms when the scope calls for it. We prefer the fewest moving parts that will still be running in three years.
If a spreadsheet or an off-the-shelf tool is the honest answer, we say so on the discovery call and point you to it — that call costs you thirty minutes, not a commitment.
No. Web & eCommerce has published prices and fixed scope. Custom software starts where the packages end — quoted, because no two systems are the same.
A 30-minute discovery call, then a written scope with milestones and one fixed number. If we're not the right builders, we say so on the call.