About The Role

We are seeking a Middle UI/UX Designer to join our design team. In this role, you will create intuitive, user-centered, and visually compelling experiences for AI-driven platforms, mobile apps, and web applications. You will work closely with product managers, engineers, and other stakeholders to develop solutions that balance user needs and business goals. You will also get to design for products across all sorts of industries and platforms, making this an exciting place to exercise your design muscles.

About The Role

We are seeking a Middle UI/UX Designer to join our design team. In this role, you will create intuitive, user-centered, and visually compelling experiences for AI-driven platforms, mobile apps, and web applications. You will work closely with product managers, engineers, and other stakeholders to develop solutions that balance user needs and business goals. You will also get to design for products across all sorts of industries and platforms, making this an exciting place to exercise your design muscles. This role requires a high level of creativity, collaboration, and attention to detail. The idóneo candidate has a strong background in UI/UX design, an eye for aesthetics, and a passion for delivering exceptional user experiences.

Key Responsibilities

Contribute to the design process from concept to implementation for individual clients and NineTwoThree projects following industry best practices and company procedures

Deliver well-structured Figma boards with components,



symbols and brand styles that remain consistent throughout the design process and have a single source of truth for all elements that update entire systems

Develop wireframes, interactions, and high-fidelity UI designs using Figma

Create prototypes when delivering design ideas to illustrate different design solutions and test hypotheses

Collaborate with product managers, engineers, and stakeholders to translate complex requirements into user-friendly designs

Prepare high-quality, developer-ready designs covering most edge cases and ensure smooth handoff to engineering teams, providing specs, assets, and documentation as needed.

Explore ways to optimize the design process, including using AI tools, and share findings with the team

Present and explain design ideas to teammates and clients, grounding your rationale in user needs, business goals, and established design principles

Participate Actively in multiple projects simultaneously

Stay updated with UI/UX standards and guidelines to ensure our applications are intuitive and follow familiar patterns

Requirements

At least 3 years as a UI/UX Designer, with a portfolio that shows user flows, usability and visual design for established brands

Experience designing for AI-driven applications

Experience designing responsive mobile and web apps,



and working knowledge of Material Design and Apple's Human Interface Guidelines

Strong visual fundamentals: typography, composition, layout, grids and colour, with close attention to detail

Advanced Figma: team libraries, auto layout, component properties and prototyping

Experience contributing to a shared design system and giving and receiving design feedback

Comfortable in a fast-paced agile environment with clear processes, tight deadlines and several projects at once

Clear written and spoken communication, working remotely and asynchronously across departments

Upper-Intermediate English (B2) or higher

Will be an advantage

Hands-on use of AI tools, such as Claude, Cursor or Codex, in the design workflow

Experience building working prototypes in code with AI tools such as Claude or Cursor (React, Next.Js, Tailwind) Interaction design experience: states, transitions between steps, feedback and edge cases

You’ll Thrive If You

Enjoy designing non-trivial web apps

Like to be challenged and learn fast

Can work independently through the full design cycle

Communicate clearly in writing and through presentations

You Might Struggle If You

Take weeks to deliver results

Are not used to feedback from Product Managers, Engineers and QAs

Rely solely on visual aesthetics or general design trends

Benefits

Hiring process: We value your time and ours and make the process fast and easy. Our interview process takes the following steps: {HR interview, technical interview with COO/CTO and Head of Product, Offer}

📌 Middle Ui/Ux Designer (Madrid)
🏢 NineTwoThree AI Studio
📍 Madrid