Senior UX/UI Designer

About Us:

We are building innovative data-driven solutions that power informed decision-making across advertising and marketing technology. Our platform leverages advanced analytics, real-time data processing, and sophisticated budgeting and pacing capabilities to deliver actionable insights and automated controls - all through a polished, intuitive user experience. As a team of technologists, we aim to produce human-copiloted systems for creative groups to propel humanity and society forward.

Role Overview:

We're seeking a talented Senior UI/UX Designer to drive the visual and interactive aspects of our platform. This role focuses on creating cohesive user experiences through design systems, prototypes, and production-ready designs that our full-stack engineers bring to life. You'll collaborate closely with product managers and engineering teams, translating user needs into elegant, well-specified designs while ensuring design fidelity from concept to production.

Responsibilities:

• Design and maintain our design system in Figma, creating components that map to our engineering component library.
• Create production-ready designs, wireframes, and interactive prototypes in Figma.
• Collaborate with product managers and stakeholders to understand user needs and translate them into design solutions.
• Partner with full-stack engineers to ensure design fidelity in production implementations.
• Establish and enforce design standards, visual patterns, and best practices.
• Prepare detailed design handoffs with clear specifications, redlines, and interaction documentation.
• Lead user research initiatives and usability testing to validate design decisions.
• Review production implementations against designs to ensure consistency and quality.
• Stay current with UX trends and design tools to continuously improve our design practice.
• Document design patterns, component usage, and guidelines for the product team.

Required Skills & Experience:

• 5+ years of experience in UI/UX design with at least 2 years in a senior role.
• Expert proficiency in Figma, including components, auto-layout, variants, and prototyping.
• Experience creating and maintaining design systems that translate to code.
• Strong portfolio demonstrating UI/UX design skills across web applications.
• Understanding of component-based design principles and how designs map to frontend architecture.
• Knowledge of responsive design principles and breakpoint strategies.
• Understanding of accessibility standards (WCAG) and inclusive design practices.
• Knowledge of user research methodologies and usability testing.
• Strong verbal and written communication skills in English for effective collaboration, documentation, and articulating design concepts.
• Ability to create detailed design specifications and handoff documentation for engineering teams.
• Ability to collaborate synchronously with team members during core hours (9:00 AM - 5:00 PM US Eastern Time) while respecting work-life balance.

Portfolio Requirements: 

• Must submit portfolio in clickable form - something more dynamic than a powerpont-style presentation or a series of jpeg images.
• Must follow design best practices - clear resolution, designed with accessibility & mobile in mind, etc.

Preferred Qualifications:

• Experience in advertising technology, marketing analytics, or financial interfaces.
• Knowledge of data visualization design principles and techniques.
• Experience designing complex form interfaces and validation patterns.
• Understanding of design systems at scale across multiple applications.
• Experience with motion design and micro-interaction specifications.
• Experience leveraging AI tools for design ideation, prototyping, or asset generation.
• Background in user psychology or human-computer interaction.
• Knowledge of first principles (e.g. basics of tools, internals of the computer, low level concepts and how work actually gets done, etc).
• Strategic thinking skills (e.g. high level concepts, fundamental logic/reasoning).
• Contributions to open-source design systems or design community resources.

What We Offer:

• Competitive salary and comprehensive benefits.
• Access to cutting-edge AI development tools.
• Flexible work arrangements.
• Professional development opportunities.
• Collaborative and innovative team culture.
• Opportunity to work on impactful, data-driven products.

**All applications must include a Resume & Cover Letter in English to be considered. 

Kepler is a people first organization. If this roles piques your interest but you may not check every box, we still encourage you to apply! Studies show that imposter syndrome can prevent women and people of color from applying unless they meet every single qualification. We welcome all who are interested to apply, you just might be a great candidate for this role or others.

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Client-provided location(s): Santa Ana, Costa Rica

Job ID: 7614953

Employment Type: OTHER

Posted: 2026-03-31T23:31:50