Client work · NDAMVP contribution
ProteGO
↗Dashboard hierarchy and quest entry for a citizen-science monitoring platform, shipped to MVP.
AR capture: designed and handed off; outside the MVP.
Product / UX designer
Josué Perez Andújar.
I turn complex workflows into clear interfaces and working prototypes.
Product / UX design, from the first interaction to the edge cases. Delivered client work, AI interactions, and hands-on prototyping.
Available for employment, contracts and focused projects. US citizen; remote across US and European hours.
Personal prototypeNot piloted
NuvAI
↗A sample-data inbox where a person approves the draft.
Built solo. The approval gate is interactive; no pilot or users.
“He designs in a way that's actually buildable, thinks in systems and states, and holds the user experience without slowing the team down.”
“He thinks like a founder and cares like a craftsman.”
Beyond the thumbnailLook closer.
Look closer.
Check the thinking.
Contribution
What actually shipped
Client delivery, with the scope made explicit.
Interaction
A boundary you can test
Give the agent permission. See what it refuses.
Perspective
Ask the engineer
Maria Carolina Rinaldi, who built ProteGO with me.
Selected case studies
The work, in context.
Client delivery. Personal systems. Working prototypes.
Each project tells you which.
Client work · NDA
MVP contributionProteGO
Make the next action clear.
Dashboard hierarchy and quest entry for a citizen-science monitoring platform, shipped to MVP. The AR capture flow was designed and handed off.
Explore the workAI-native product design
Working prototype · Product designer & builderNuvAI
Autonomy with a human boundary.
An AI lead assistant for real-estate agents, designed and built solo: a sample-data inbox, draft approval and an explicit handoff to a person. No pilot or users.
Explore the work
Human–agent interaction
Interactive artifactAccess is not permission
A refusal is a design decision.
The permission board that governs the AI agents I run, made interactive. Change the autonomy rules and see what it still refuses.
Explore the work
Product & systems design
Shipped · Daily use (n=1)Compass
One clear next move.
A personal orientation layer I designed and built: fifteen scattered state surfaces collapsed into one two-minute morning glance.
Explore the work
Product design · Triage
Prototype · No users yetBaseLine
Clarity when context is scarce.
Decision support for rail maintenance engineers: a triage list for where to look first this week. Sole designer, from research to interactive prototype.
Explore the work
Climate intelligence
Concept & prototypeSol OS
Different people. Different decisions.
Climate intelligence for Barcelona: planners and residents, one platform. Sole designer; the planner prototype works, not yet piloted. Started as the ClimateOS multi-lens prototype.
Explore the workWorking artifactsDon't just read
Don't just read
about human control.
Try a decision. See where the system stops and a person takes over.
The product thinking behind NuvAI ↗Interactive governance artifact
Access is not permission.
The board lets you change the autonomy rules and test an action. Some actions remain unavailable even when their control looks permissive.
Open the permission board ↗Read the original artifact →Working prototype · Built solo · Not piloted
The person has the last word.
Open the Spanish sample-data inbox and approve a draft. Nothing is sent to anyone. Disclosure and pace remain documented design patterns.
Open the approval gate ↗What this prototype does and doesn't do →People, not badgesThe other side
The other side
of the collaboration.
01 / 03
“I built ProteGO alongside Josué, and what stood out was how seamlessly he works with engineers. He designs in a way that's actually buildable, thinks in systems and states, and holds the user experience without slowing the team down. He speaks our language. I'd work with him again on anything where design and engineering have to move as one.”
“The way the use-case scenarios are understood by Josue and the UX solutions (and the underlying frameworks) formulated demonstrate Josue's ability to cut through the problems leveraging his multi-disciplinary expertise. The formulation of Compass drew my attention, particularly.”
“I've known Josué for twenty years, and what's never changed is how he thinks: he finds the human underneath any system and won't look away from the hard part of a problem. Long before “AI UX” was a title, he was the person I brought ideas to because he'd see the angle no one else did. He thinks like a founder and cares like a craftsman.”
Follow a design questionThere is more
There is more
behind the work.
Different projects. Connected questions.
Open the full archive ↗Work with meFind the problem.
Find the problem.
Make the next version.
Hire me for a role, a contract or a focused piece of work.
Fixed prices below are in US dollars, excluding applicable taxes.
Review a flow
$200 USD
Know what to fix first.
One user goal across up to five screens or states. A concise annotated report with 5–10 prioritized findings and the three actions worth taking first.
Expert review, not user testing. Sample report: composite product, no client.Design & prototype
Scoped to your brief
Make the fix tangible.
Redesign one important flow or turn an idea into a testable prototype. Figma screens, interaction states and a handoff, with a functional web prototype where it serves the brief.
Employment, contract and agency overflow work also welcome. No audit purchase required.What a review is not: user testing, analytics research, a redesign or implementation. It is one designer's expert read of your flow, written down. See what is and is not included →
Need a larger review? Compare the existing audit options
UX Teardown
$350 USD
The five leaks costing you most.
Five prioritized UX issues in a booking, onboarding or checkout flow, with a recommended fix for each.
Delivered after payment is verified and the brief is complete.Audit · One Critical Flow · AI-Native Lens
UX Audit · Critical Flow · $550
Five days. The full audit of one flow, not only its top five leaks: pick the flow that matters most (onboarding, checkout, your AI copilot) and get a teardown of everywhere it leaks trust, with prioritized, implementable fixes. Chat, voice, and agent surfaces are home turf.
5 days · Written report + walkthrough call · Fixed price
Audit · Whole Product · AI-Native Lens
UX Audit · Full Product · $850
The whole journey: heuristic review, friction map, and a ranked fix list your team can execute without me. We agree the screens, roles and states before booking. The one-week review covers that agreed scope.
1 week · Written report + walkthrough call · Fixed price
The $550 and $850 audits retain their published guarantee. Read the terms →
Bring me the
hard part.
Hiring for a team or a contract? Share the role, the product and the work you need covered. I’m available for Product/UX work and relevant adjacent technical roles.
Need a review, a redesigned flow or a working prototype? Send the product, the problem and your timeline. We can agree a focused paid scope.
Book a 30-min intro call ↗josue@perex.design ↗You've been using the design system.HTML, CSS & JavaScript · Self-hosted type · No animation library