Senior UX/UI Designer

We’re looking for a Senior UX/UI Designer – Digital Products

Barcelona · Hybrid · International Environment

Are you ready to shape high‑impact digital experiences in a fast‑growing Tech Hub? At Hays, we’re partnering with an international company looking for a Senior UX/UI Designer who thrives in end‑to‑end product ownership, Lean UX methodologies, and data‑driven decision‑making.

What will you do?

You will own and lead the full UX/UI design process for selected digital products and features — from discovery to final delivery.

You will:

• Apply Lean UX principles: small iterative steps, lightweight artefacts and continuous validation with users and data.
• Collaborate closely with Product, Engineering, Data/AI and Business stakeholders.
• Translate insights into clear problem statements, hypotheses, and success metrics.
• Design user journeys, flows and interactions across web, app and internal tools to create seamless experiences.
• Build wireframes, interaction models and low‑ to high‑fidelity prototypes, delivering UI aligned with the brand, design system and accessibility standards.
• Use AI‑assisted tools for ideation, variants, UX writing, localisation or research synthesis — always applying critical judgement.
• Design and refine AI‑ and data‑enabled features (search, recommendations, personalisation, assistants, smart tooling…).
• Make decisions based on both quantitative and qualitative data.
• Design not only for humans but also for synthetic users (AI agents, scripts), ensuring robust interaction contracts.
• Contribute to the design system and cross‑platform consistency.
• As a Senior: lead workshops, provide feedback to fellow designers, and help elevate UX practices across teams.

Your Profile

• Several years of experience in UX/UI design in agile, fast‑paced environments.
• Degree in Design, HCI or related field — or equivalent hands‑on experience.
• Strong portfolio including:
• End‑to‑end product design
• Complex flows and interaction/service design
• Strong visual design fundamentals
• Demonstrated impact on user/business outcomes
• Proven Lean UX mindset and collaborative approach with Product & Engineering.
• Proficiency with modern design/prototyping tools (Figma, Sketch, Adobe CC, Axure, Framer…).
• Strong analytical skills and user research capability.
• Solid understanding of AI/ML in product design (trust, transparency, user control).
• Practical experience using AI tools in your design workflow.
• Interest or experience designing for non‑human users is a plus.
• Strong communication skills in English; German is a plus.
• For Senior level: ownership, the ability to influence across teams, and mentoring experience.

What’s in it for you?

• Direct contract with the company.
• Young, dynamic environment where you can contribute and co‑create the Tech Hub culture.
• 10% discount on the company’s entire website.
• Flexible Pay “MediaFlex Program” (Meal vouchers, private medical insurance, etc.).
• Flexible working hours + hybrid model.
• Intensive workday every Friday and during summer.
• Option to work from two offices in Barcelona (HQ with subsidised menu under €4, or Pier01 with free weekly fruit & coffee).
• Annual training budget to grow professionally and personally.
• Free language classes (English, Spanish, German).
• Birthday off — your day to enjoy.
• Work with a cutting‑edge tech stack in a truly international team.