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Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ I'm a product designer and software engineer with a passion for building exceptional digital experiences. I use my technical background to ensure a seamless bridge between creative vision and technical execution. Whether I'm a dedicated Product Designer on a team, or a freelance Web Designer + Developer building a complete solution, my goal remains the same: to craft products that are not only intuitive and beautiful but also robust and built to last.…Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ I'm a product designer and software engineer with a passion for building exceptional digital experiences. I use my technical background to ensure a seamless bridge between creative vision and technical execution. Whether I'm a dedicated Product Designer on a team, or a freelance Web Designer + Developer building a complete solution, my goal remains the same: to craft products that are not only intuitive and beautiful but also robust and built to last.

Christian Castillejo

Product Designer, Web Designer, UI Designer, +5

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Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ I'm a product designer and software engineer with a passion for building exceptional digital experiences. I use my technical background to ensure a seamless bridge between creative vision and technical execution. Whether I'm a dedicated Product Designer on a team, or a freelance Web Designer + Developer building a complete solution, my goal remains the same: to craft products that are not only intuitive and beautiful but also robust and built to last.…Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ I'm a product designer and software engineer with a passion for building exceptional digital experiences. I use my technical background to ensure a seamless bridge between creative vision and technical execution. Whether I'm a dedicated Product Designer on a team, or a freelance Web Designer + Developer building a complete solution, my goal remains the same: to craft products that are not only intuitive and beautiful but also robust and built to last.

Available to hire

Sevilla, Spain

Portfolio: Website not available. Sign in: https://www.twine.net/signup

I’m a product designer and software engineer with a passion for building exceptional digital experiences. I use my technical background to ensure a seamless bridge between creative vision and technical execution.

Whether I’m a dedicated Product Designer on a team, or a freelance Web Designer + Developer building a complete solution, my goal remains the same: to craft products that are not only intuitive and beautiful but also robust and built to last.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Spanish; Castilian

Fluent

Work Experience

Product Designer & Software Engineer at Kashmir Shaiva Institute

January 1, 2025 - September 25, 2025

Conducted foundational user research and card sorting to build a data-driven information architecture and define key personas. Designed the complete UI based on red route analysis, validating concepts through iterative usability testing. Handled the full development, translating the final, validated designs into a live website.

Personal Sabbatical

January 1, 2024 - September 25, 2025

Embarked on an 18-month backpacking solo journey across Asia and South America, focusing on personal growth and mindfulness practices. Volunteered with local ecological and self-sustainable projects, gaining practical experience with community-based problem-solving and sustainable systems. Navigated unfamiliar environments with limited resources, developing adaptability through experiences like a month-long camp in the Himalayas.

Lead Frontend Software Engineer & UI/UX Designer at Grand ado

January 1, 2023 - September 25, 2025

Led the frontend development team for a multi-brand e-commerce platform serving 17 countries. Designed and implemented responsive and accessible UI components for web and native applications, ensuring a consistent and intuitive user experience. Collaborated with product and design teams to translate wireframes and mockups into robust, pixel-perfect layouts. Led the visual design and interaction of new features, iterating on layouts and components to improve usability and aesthetics. Mentored engineers on UI best practices and design consistency.

Full Stack Software Engineer at OGD ict-diensten

January 1, 2020 - September 25, 2025

Developed responsive web and mobile apps for a diverse range of internal and client projects, with a strong focus on implementing high-quality, user-facing features. Collaborated in a semi-remote team to translate project requirements into robust and intuitive digital products.

Full Stack Software Engineer at Stack Shuttle

January 1, 2017 - September 25, 2025

Contributed to the full product lifecycle for various client projects, from initial concept development (0 to 1) to production-stage enhancements. Engineered user interfaces for both web (React) and mobile (React Native), ensuring a seamless and consistent experience for both B2B and B2C users.

Software Engineer at IBT

January 1, 2017 - September 25, 2025

Developed a quantitative trading application from concept to launch, designed to analyze and visualize real-time financial market data for users. Focused on translating complex data analysis requirements into a functional and friendly user-facing tool.