Javier Fernández Iglesia - Product UX/UI Designer

UX/UI case study

Designing the charging experience for public EV infrastructure

Wallbox Public EV charger

This project shows my role at Wallbox during the creation and definition of the use of public electric vehicles chargers at Wallbox.

I joined Wallbox as the company was developing both home charging and public EV infrastructure. My role on this project as UX/UI Product Designer was to define how drivers interact with the public charger (Supernova) from arrival to payment.

Company

Wallbox

My role

UX/UI Product Designer

Project type

Product / Service

Electric vehicle charger ecosystem & platform

Time span

Dec 2020 - Sep 2021

Tools

Figma / Adobe XD

User Testing

Miro

Jira / Confluence

Mapping the interaction layer

I developed detailed user flows focused on the charger's touchscreen — the primary touchpoint between driver and hardware. The flow had to work under real conditions: outdoor lighting, time pressure, first-time EV users.

Project background - Process

Understanding the charging scenario

Before wireframing, I mapped early user stories covering the full charging session arc. This led to critical conversations with product, engineering and business stakeholders about edge cases not defined yet: what happens on a timeout, a connector mismatch or a failed payment. Getting those scenarios aligned early prevented significant rework downstream.

Mapping the interaction layer

I developed detailed user flows focused on the charger's touchscreen — the primary touchpoint between driver and hardware. The flow had to work under real conditions: outdoor lighting, time pressure, first-time EV users.

Structure before Visuals

Working in agile sprints, I produced lo-fi wireframes fast and focused on information hierarchy per screen state. The charger's physical constraints like outdoor readability, glare, a standing user in a hurry meant rethinking layout assumptions from scratch. I tested this with users, using lo-fi prototypes, interviews and analyzing interaction exercises results on the charger screen, as I supported engineering team to define on the EV charger model the optimal position for cables, connectors, payment terminal, etc. to validate assumptions and ensure final charger meet expectations.

Validating the flow in motion

I built several wireflow prototypes to connect screens into a navigable sequence, used internally to align engineering on interaction states and validate timing, error handling and payment confirmation. Assumptions about the workflow were revealed, something that is better detected in the low-fidelity phase than in the production phase.

The solution

Agile building for a product the market demands

The pace was intense. In June 2021, Iberdrola acquired the first 1,000 Supernova units for global deployment. The design work I contributed to fed directly into a product that went from announced to listed on the NYSE within a single year.

The operator layer: B2B energy management

Parallel to the end-user flow, I worked on Wallbox's B2B management platform. The dashboard operators use to monitor charger networks, manage users and analyse energy data. A different problem space: chargers fleet, reliable information for a facilities manager, energy costs. The prototype covers session monitoring, remote diagnostics and user access control.

✦ What I have learnt working on this project

Supernova pushed me to design for physical constraints I couldn't simulate at my desk — outdoor conditions, connector ergonomics, new needs in the market. It shaped my instinct for design that has to work in the real world, not just in a prototype.