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Senior User Experience Designer

Criticalmass

San Jose, Costa Rica (San Jose) permanent

Posted: February 25, 2026

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Quick Summary

Design and deliver major features as a senior UX designer with a focus on user experience, contributing to the end-to-end delivery of a project.

Job Description

Senior UX Designer

Output of this role is to design major features and contribute influential input at a design and development level and be responsible for part of a project’s user experience design and end-to-end delivery.

Career Development is typically provided by Associate Director UX or Director of UX but can be adapted to suit an account and/or office location.

Nature of this role of role is that of a ‘deliver-er’: here to design at a mastery level, contribute to design and development process and own full project deliverables with little oversight. Starting to be seen as leader or go-to in the User Experience discipline.

Skills Developed Creative

• User-centered approach by fostering self-awareness and empathy

• Incorporate simplicity, elegance, and beauty into design of systems, flows and interfaces

• Expertise with process/business analysis, software development and large-scale project delivery processes

• Support business development process by conducting relevant research, identifying key insights, and producing pitch materials

• Articulate complex ideas clearly to both the internal team and client

• Understand how a discipline works, what they need from you and how you can work together to fine-tune or delivery a concept

• Habit of being well-informed regarding new software and design concepts Delivery

• Lead mid-level project work from a design perspective with autonomy and authority

• Proactively integrate into the production process at a project level (versus a task level)

• Independent decision making on design and executing the process

• Understand how a discipline works, what they need from you and how you can work together to fine-tune or delivery a concept

Leadership

• Know when and who to escalate to, how to communicate the issue, and how to collaborate for solutions for any project delivery issue

• Present your work and the work of other to clients

• Answer discipline-related questions from other user experience designers

• Foster relationships with other disciplines and the creative team Activities Performed

• Design systems, flows and interfaces

• Gather and incorporate client and user feedback

• Conduct research, identify insights

• Conduct surveys, user interviews and synthesis

• Outline research criteria for research team

• Conduct usability testing

• Set up information architecture, navigation and system design

• Write and update documentation

• Create system and site architecture, logic maps and flow diagrams

What We Offer:


Global maternity and parental leave


Work-life ballance


Competitive benefits packages

• Vacation, compassionate leave, wellness days, and flex days

• Access to online services for families and new parents

• Diversity and Inclusion Board with 13 affinity groups

• Internal learning and development programs


Asociación Solidarista - You can join voluntarily

Critical Mass is an equal opportunity employer.

Critical Mass uses artificial intelligence in our recruitment process to enhance job postings, filter keywords during the review of prospective candidates, and, in some cases, transcribe interviews with our recruiters. Human review remains central to the process, and all hiring decisions are ultimately made by our team.

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs criticalmass.com, omc.com and us.greenhouse-mail.io. We will not use apps such as Facebook Messenger, WhatsApp, or Google Hangouts for communicating with you. We will never ask you to send us money, technology, or anything else to work for our company. If you believe you are the victim of a scam, please review your local government consumer protections guidance and reach out to them directly.

If U.S. based: https://www.consumer.ftc.gov/articles/job-scams#avoid
If Canada based: https://www.canada.ca/en/services/finance/consumer-affairs.html
If U.K. based: https://www.gov.uk/consumer-protection-rights
If Costa Rica based: https://www.consumo.go.cr/educacion_consumidor/consejos_practicos.aspx

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