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}

📌 UX/UI Designer (Madrid)
🏢 NineTwoThree AI Studio
📍 Madrid