I’m Sebs

UI/UX Designer
from Cali, Colombia

Psst, hey… Collaborating internationally…

  • AI-First Designer
  • Consultant
  • Logo Maker
  • UI Designer
  • UX Designer
  • Brand Designer
  • Creative Advisor
  • Shopify Manager
Let’s work together

I’m Sebastián Castillo, a passionate designer from Colombia with over 4 years of experience in creating impactful brands and digital products. I focus on transforming ideas into engaging, user-centered experiences that foster brand growth. Collaborating with businesses of all sizes worldwide, I strive to deliver meaningful and effective design solutions.

Areas of expertise

Web Design

I create visual identities that translate brand values into clear, scalable systems across digital products and e-commerce platforms.

  • UI/UX Design
  • Websites & Landing Pages
  • Web/App Design
  • Shopify CMS Setup

Branding and Identity

I build strategic brand identities that translate business vision into clear, consistent, and scalable visual systems across digital touchpoints.

  • Brand Strategy
  • Visual Identity
  • Logo Design
  • Design System
  • Digital Branding

Shopify & E-Commerce

I design and optimize e-commerce ecosystems focused on performance, scalability, and measurable business growth through UX and CRO.

  • Shopify Custom Themes
  • CRO Strategy
  • Analytics Setup
  • E-Commerce UX
  • Store Optimization

Product & Project Leadership

I lead digital projects from strategy to launch, aligning design, development, and business goals through structured execution.

  • Product Strategy
  • Roadmapping
  • Team Coordination
  • Sprint Planning
  • Launch Management

Let’s work together

Contact me

Recent Work

Fordvia Perficient

  • Ford website hero redesign

    Multi-site visual refresh across external-facing platforms.

  • Ford interface screens

    Brand-aligned interfaces under tight constraints.

  • Ford component library

    Developer-ready components built for real use.

  • Ford long-page layout

    Design systems adapted into flexible, scalable layouts.

  • Ford page design

    Strategic execution under tight timelines.

The Paper Storevia Perficient

Visit site (opens The Paper Store in a new tab)
  • The Paper Store homepage redesign

    Full e-commerce website redesign.

  • The Paper Store style tile

    Custom style tile and design system.

  • The Paper Store product listing page

    Homepage, PLP, and PDP refresh.

  • The Paper Store visual direction

    Competitive analysis and visual direction.

  • The Paper Store mobile UI

    Modern UX and UI for a retail gift brand.

  • The Paper Store handoff screens

    Development-ready handoff.

Ours Branding

  • Ours Consulting brand identity
  • Ours Consulting logo and palette
  • Ours Consulting business cards

MundoFit

Visit site (opens MundoFit in a new tab)
  • MundoFit Shopify store homepage

    Shopify redesign with ongoing optimization.

  • MundoFit store screens

    Led UX, UI, CRO, and project management.

  • MundoFit mobile shopping flow animation

    Focused on mobile, performance, and conversion.

  • MundoFit design system animation

    Scalable design system and interfaces.

  • MundoFit product pages

    First project led with full responsibility.

MissionSquarevia Perficient

Case study for MissionSquare Visit site (opens MissionSquare in a new tab)
  • MissionSquare homepage hero

    Selected look and feel for the full website redesign.

  • MissionSquare savings calculator

    Most of the components and screens across the site.

  • MissionSquare financial tools section

    One navigation system for three distinct audiences.

  • MissionSquare products and services grid

    Typography direction that guided the final typeface.

  • MissionSquare by the numbers section

    Data-forward storytelling for a retirement brand.

Honeywellvia Perficient, with Interbrand

Visit site (opens Honeywell in a new tab)
  • Honeywell homepage hero

    Global corporate website redesign with Interbrand.

  • Honeywell brand storytelling section

    Brand-aligned UI for a century-old industrial leader.

  • Honeywell industries grid

    Navigation architecture across business units.

  • Honeywell outcomes carousel

    Industry and outcome page templates.

  • Honeywell customer stories component

    Modular component library for scalable page building.

Honeywell Aerospacevia Perficient, with Interbrand

Visit site (opens Honeywell Aerospace in a new tab)
  • Honeywell Aerospace homepage hero

    Website redesign for a global aerospace brand.

  • Honeywell Aerospace markets carousel

    Polished visual design across core page templates.

  • Honeywell Aerospace electrification feature

    Art direction and image selection.

  • Honeywell Aerospace news cards

    Alternative design concepts presented to the client.

Perficient

  • Perficient project management tool

    Custom internal project management tool.

  • Perficient design system

    Design system contributions for internal tools.

  • Perficient wireframes

    UX research, IA, wireframes, and UI design.

  • Perficient dashboards

    Dashboards for projects, clients, and tasks.

  • Perficient data tables

    Scalable components and clean data tables.

Constructora Bolívarvia Perficient

  • Bolívar Contigo platform

    Digital platform for home delivery and key access.

  • Bolívar Contigo mobile screens

    Mobile-first experience focused on clarity.

  • Bolívar Contigo dashboard

    UI design for dashboards and warranty flows.

  • Bolívar Contigo design system

    Design system contributions to guarantee consistency.