Critical Software
UX/UI
Critical SoftwarePortugal4 days ago
Full-timeEngineering, Information Technology
The future of rail isn’t just about movement, it’s about intelligence, security, and connection. We unite rail expertise with digital innovation to create smarter, safer, and more sustainable transportation solutions. Technology here speaks with purpose: accelerating digitalization, embedding cybersecurity, and shaping the next era of rail.

Behind every breakthrough are people, their talent, creativity, and drive to push boundaries. Together, we’re building confidence, resilience, and a new standard for connected mobility powered by innovation.

This position is for Stadler Digital Labs, a joint venture between Stadler Rail and Critical Software serving as the digital competence center for the Stadler Group.

Check-out the website: https://stadlerdigitallabs.com

Now, we’re looking for a talented Ux/Ui to join our team.  Sound like you? Then it’s time to challenge your limits. It’s time to power up your career.

Key Responsibilities

  • Design intuitive, user-centred interfaces for web and desktop applications used in safety-critical railway systems.
  • Conduct user research activities including interviews, surveys, and usability testing to gather insights and validate design decisions.
  • Translate user needs and business requirements into wireframes, prototypes, and high-fidelity visual designs.
  • Collaborate closely with Product Owners, Software Engineers, and Systems Engineers throughout the product development lifecycle.
  • Contribute to the creation and maintenance of design systems, component libraries, and UI style guides.
  • Iterate on designs based on stakeholder feedback, usability findings, and technical constraints.
  • Support the definition and documentation of UX guidelines and best practices across teams.
  • Participate in design reviews and present design solutions clearly to cross-functional teams and stakeholders.

Which Brings Us To You, The Person With

  • Bachelor's degree (or equivalent) in Interaction Design, Graphic Design, Human-Computer Interaction, Communication Design, or a related field.
  • 1–3 years of professional experience in UX/UI design (Junior to Mid level); internship or academic project experience considered for junior applicants.
  • Solid portfolio demonstrating end-to-end UX design work, including research, wireframing, prototyping, and final visual design.
  • Experience working within agile/scrum development teams.
  • Understanding of accessibility standards (WCAG) and inclusive design principles.
  • Ability to balance aesthetic quality with usability and technical feasibility.
  • Proficiency in Figma (primary tool); experience with Adobe XD, Sketch, or similar prototyping tools is a plus.
  • Experience producing and maintaining design tokens or component libraries.
  • Strong communication and presentation skills;
  • Ability to articulate design rationale clearly.
  • Collaborative mindset with a willingness to give and receive constructive feedback.
  • Detail-oriented, organised, and comfortable managing multiple workstreams.
  • Curiosity and a proactive attitude towards learning new tools and domain knowledge.
  • Adaptability in a fast-paced, multidisciplinary environment.

What We Provide

  • Work that fits your life, not the other way around
  • Offices designed to make you feel like you belong
  • A team that knows how to work hard, but also how to have fun
  • Pay that makes you feel valued, plus performance-based rewards
  • Your growth is our priority: training, support, and opportunities!

Plus, Perks With Purpose

  • Private Health Insurance Because your health and peace of mind matters.
  • Employee Assistance Programme Confidential support for you and your household from mental health to legal or financial advice, we're here for whatever life throws your way.
  • Home Office Support Get what you need to work comfortably from home, without turning your living room into an ergonomic nightmare.
  • Extra Holidays The longer you’re with us, the more you get. Two extra days after your first year, and more as time goes on.
  • Extra Parental Leave Two additional months of fully paid leave for both parents — whether you're welcoming a child by birth or adoption.
  • Flex-time We don’t clock-watch. Work when it makes sense for you, as long as it works for your team and goals.
  • Gradual Return to Work Support Returning after a long break? We’ll help you ease back in with a plan that fits your pace and needs.
  • Away From Keyboard - Sabbatical programme Long-term employees can take time off to explore new ideas, projects or experiences and come back with fresh eyes and stories to tell.

Key Skills

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