IxDF Certificate of Completion

Interaction Design for Usability

IxDF Course Certificate awarded to Leonidas Lazos for completing the "Interaction Design for Usability" course

The Interaction Design Foundation (IxDF) hereby certifies that the IxDF Course Certificate (ID #b066c8ed-dc19-4489-8c36-cda3554026e1) has been conferred upon Leonidas Lazos with a Top 10% Course Taker Distinction in formal recognition of completing evidence-based curricula taught by industry leaders, to the standards established by the IxDF Educational Codex. View Course Curriculum.

This document serves as the official record of the above credential. Third parties may reference the certificate ID to verify its authenticity. The Interaction Design Foundation maintains permanent records of all credentials issued.

Verified Competencies Demonstrated by Leonidas Lazos

By completing this curriculum to the standards of the IxDF Educational Codex, Leonidas Lazos has demonstrated mastery of how to:

  • Plan and run moderated usability tests, then turn findings into prioritized fixes, grounding design decisions in evidence.

  • Conduct heuristic evaluations and benchmarking to catch problems early, while they're less costly to fix.

  • Run and analyze card sorts to structure navigation around how people actually think, so users can find what they need without guessing.

  • Design and interpret A/B and multivariate tests to prove which version performs.

  • Build conversion funnels and run root cause analysis to pinpoint where users drop off and why.

  • Quantify interaction efficiency with Fitts' Law and the Keystroke-Level Model to make frequent tasks measurably faster.

  • Audit interfaces against WCAG accessibility standards and optimize for search (SEO) to widen reach and reduce legal exposure.

  • Design usable forms, navigation, and visual layout using layout grids, visual hierarchy, and Gestalt grouping.

  • Apply persuasion and trust techniques, from credibility cues to emotional journey mapping, to build the trust that lifts conversion.

  • Build personas that keep real users at the center of every decision, as well as the requirements and prototypes that turn insight into tested design.

  • Integrate UX into Agile delivery using the Parallel Streams approach and design maps, keeping design and research one cycle ahead of development.

  • Use the psychology of attention and perception to guide the eye to the most important elements first.

  • Apply human error theory to design interfaces that help users avoid mistakes and recover from them.

  • Distinguish conceptual and domain models and use them to provide a shared understanding across a team.

  • Use the inverted pyramid and readability metrics so users can find and act on content quickly.

  • Design dynamic interfaces with AJAX that update smoothly without disorienting users or compromising SEO and accessibility.

  • Close the empathy gap with empathetic design techniques, replacing vague user stories with persona stories that keep development grounded in real user needs.

View Profile: Leonidas Lazos
  • IxDF Best-in-Class
    IxDF Best-in-Class distinction: Completed an IxDF Course with a score of 100%
  • IxDF Top 10% Course Taker
    IxDF Top 10% Course Taker distinction: Completed an IxDF course with a score of 90%
  • IxDF Assiduous Learner Award
    IxDF Assiduous Learner Award distinction: Completed 5 IxDF Courses
  • IxDF Community Explorer
    IxDF Community Explorer distinction: Attended 3 IxDF Meetups
  • More distinctions
    +3

42719, Germany

Leonidas Lazos

Expert Software Engineer

IxDF Distinctions

Distinctions are conferred upon Leonidas Lazos in formal recognition of their notable achievements and contributions, as stipulated by the IxDF Educational Codex.

IxDF Assiduous Learner Award Distinction IxDF Assiduous Learner Award
Completed 5
IxDF Courses
IxDF Best-in-Class Distinction IxDF Best-in-Class
Completed an IxDF Course
with a score of 100%
IxDF Certified Course Completer Distinction IxDF Certified Course Completer
Completed one or more
IxDF Courses.
IxDF Community Explorer Distinction IxDF Community Explorer
Attended 3 IxDF Meetups
IxDF Local Group Member Distinction IxDF Local Group Member
Member of an
IxDF Local Group
IxDF Master Class Learner Distinction IxDF Master Class Learner
Completed one or more
IxDF Master Classes
IxDF Top 10% Course Taker Distinction IxDF Top 10% Course Taker
Completed an IxDF course
with a score of 90%

Certificates Earned
by Leonidas Lazos

IxDF Course Certificates are awarded to Leonidas Lazos in formal recognition of completing evidence-based curricula taught by industry leaders, to the standards established by the IxDF Educational Codex.

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Human-Computer Interaction: The Foundations of UX Design certificate

Human-Computer Interaction: The Foundations of UX Design

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The Brain and Technology: Brain Science in Interface Design certificate

The Brain and Technology: Brain Science in Interface Design

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IxDF Master Class Certificates Earned

IxDF Master Class Certificates are awarded to Leonidas Lazos in formal recognition of their attendance and ongoing commitment to learning from industry leaders.

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Sketch with Confidence: The Skill That Gets Your Design Thinking Out of Your Head certificate

Sketch with Confidence: The Skill That Gets Your Design Thinking Out of Your Head

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Align Teams, Save Time and Reduce Stress with Communication Systems certificate

Align Teams, Save Time and Reduce Stress with Communication Systems

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Demonstrate the ROI of Design Thinking and Win Stakeholder Support certificate

Demonstrate the ROI of Design Thinking and Win Stakeholder Support

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What's Your Best Career Move? Why Building a Design Community Was Mine certificate

What's Your Best Career Move? Why Building a Design Community Was Mine

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How to Break into UI Design: Design Skills That Make You Irreplaceable by AI certificate

How to Break into UI Design: Design Skills That Make You Irreplaceable by AI

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The AI Playbook: How to Capitalize on Machine Learning certificate

The AI Playbook: How to Capitalize on Machine Learning

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The Human Experience: Drive Growth with a Customer-Led Approach certificate

The Human Experience: Drive Growth with a Customer-Led Approach

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Innovate with Design Thinking: Your Shortcut to Results certificate

Innovate with Design Thinking: Your Shortcut to Results

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Design for Everyone: A Firsthand Perspective on Accessibility certificate

Design for Everyone: A Firsthand Perspective on Accessibility

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Learning Experience Design That Delivers Impact: A Step-by-Step Guide certificate

Learning Experience Design That Delivers Impact: A Step-by-Step Guide

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Hooked: How to Build Habit-Forming Products with Nir Eyal certificate

Hooked: How to Build Habit-Forming Products with Nir Eyal

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Storytelling That Sells UX Design: Define Requirements and Engage Leadership certificate

Storytelling That Sells UX Design: Define Requirements and Engage Leadership

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Influence Product Strategy with Design: Learn from a Booking.com Case Study certificate

Influence Product Strategy with Design: Learn from a Booking.com Case Study

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Earn Your Seat at the Table: Leadership Lessons for Designers certificate

Earn Your Seat at the Table: Leadership Lessons for Designers

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How to Design for the Human Mind: Cognitive Science for UX certificate

How to Design for the Human Mind: Cognitive Science for UX

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Design for Adaptability: Component-Driven Information Architecture certificate

Design for Adaptability: Component-Driven Information Architecture

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UX Magic: Achieve 10X Better Designs Through Semantic Interaction Design certificate

UX Magic: Achieve 10X Better Designs Through Semantic Interaction Design

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How to Create Successful Design Systems with Storytelling certificate

How to Create Successful Design Systems with Storytelling

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Radical Participatory Design: Insights From NASA’s Service Design Lead certificate

Radical Participatory Design: Insights From NASA’s Service Design Lead

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How to Elevate Your Portfolio: Sketching Your Design Process certificate

How to Elevate Your Portfolio: Sketching Your Design Process

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How to Design for Neurodiversity: Inclusive Content and UX certificate

How to Design for Neurodiversity: Inclusive Content and UX

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Beyond Interfaces: The UI Design Skills You Need to Know certificate

Beyond Interfaces: The UI Design Skills You Need to Know

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How to Break into UX Design and Product Design: A Career Change Guide certificate

How to Break into UX Design and Product Design: A Career Change Guide

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Exclusive: Design for a Better World, a Discussion with Don Norman certificate

Exclusive: Design for a Better World, a Discussion with Don Norman

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Mental Models: How to Design for the Way Your Users Think certificate

Mental Models: How to Design for the Way Your Users Think

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Design For Agile: Common Mistakes and How to Avoid Them certificate

Design For Agile: Common Mistakes and How to Avoid Them

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IxDF Membership Certificate

This IxDF Membership Certificate (ID #mc_Rdj9KxFPM) has been issued to Leonidas Lazos in formal recognition of their membership of the Interaction Design Foundation (IxDF).

The authenticity of this membership certificate can be verified on this permanent link.

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