Portafolios castaneda millan

Hello, I am Julio Andres

Front-end developer passionate about creating elegant and efficient web solutions.

My Story

I started programming four years ago, inspired by how a few lines of code can turn ideas into impactful digital experiences. Since then, I’ve contributed to projects ranging from startups to large enterprises, with a strong emphasis on user experience, performance, and writing clean, scalable code. My main focus is front-end development and e-commerce solutions.

YEARS OF EXPERIENCE
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Ready to start a project?

I’m open to new challenges and collaborations. Let’s talk about how I can help you.

My work history

A summary of my professional experience

Web Designer

2025-Present

Freelance

Developed and maintained websites for diverse clients across multiple industries, delivering customized solutions focused on digital presence, performance, and user experience. Worked independently on the design, development, optimization, and maintenance of websites, adapting to the specific requirements of each project. Projects included Inmolíder Tolima, Premium Car, Repuestos de Motos Molina, ESP Nativos, and Palmababo Advocacia, consistently meeting deadlines and ensuring high-quality deliverables.

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SOFTWARE PROGRAMMER

2021-2022

Maquinando

Developed and maintained e-commerce solutions on the VTEX platform, actively contributing to projects focused on high-traffic online stores. Responsibilities included developing new functionalities, customizing storefronts, integrating third-party services, and troubleshooting issues to ensure optimal performance and an efficient user experience. Collaborated with technical and business teams on projects for well-known brands such as Hogar Universal, Distrihogar, Vélez, and Auteco, consistently meeting quality standards, deadlines, and client requirements.

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E-commerce support agent

2020-2021

VTEX

Provided technical and functional support to clients using the VTEX platform, resolving issues through ticketing systems. Assisted in the configuration, operation, and troubleshooting of e-commerce-related problems, ensuring the smooth functioning of online stores. Collaborated with cross-functional teams to escalate complex cases and deliver efficient, high-quality service to clients.

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IT Support

2008-2011

Abaco

Provided comprehensive technical support to users and teams, including assembling and configuring PCs, and performing preventive and corrective maintenance on hardware and software. Managed the installation and administration of wired and wireless networks, configured devices, and troubleshooted issues to ensure operational continuity and optimal functioning of the IT infrastructure.

Factory Assistant

2025

Bollinghaus Steel

Performed support functions in the steel transformation process, assisting with production tasks, materials handling, and basic quality control to ensure operational efficiency. Prepared and organized supplies, assisted with basic machinery maintenance, and ensured compliance with industrial safety standards. Contributed to the smooth operation of the plant through teamwork, responsibility, and adherence to production standards.

Factory Assistant

2024

Lusiaves

Supported production processes within the plant by performing operational tasks related to the handling, sorting, and preparation of products, ensuring compliance with quality and hygiene standards. Assisted in the operation of machinery, maintained order and cleanliness in the work area, and adhered to safety regulations and internal procedures, contributing to production efficiency and continuity.

 

Factory Assistant

2023-2022

Rustipan-Panidor

Provided support in the bread production process, participating in preparation, baking, packaging, and basic quality control. Adhered to hygiene standards, food safety regulations, and internal procedures, contributing to order, cleanliness, and the proper functioning of the production area to ensure efficiency and quality at every stage of the process.

Semi-specialized Factory Assistant

2022

S.I.E

Worked in the production area providing support throughout different stages of the manufacturing process. Assisted with the basic operation of industrial machinery, performed visual and technical quality control of plastic products, and handled packaging and order preparation. Followed established procedures, safety and hygiene regulations, and collaborated effectively with the production team to meet operational goals.

Web Designer

2025-Present

Freelance

Developed and maintained websites for clients across multiple sectors, delivering customized solutions focused on digital presence, performance, and user experience. Worked independently on design, development, optimization, and maintenance, adapting to each project’s specific requirements. Projects included Inmolíder Tolima, Premium Car, Repuestos de Motos Molina, ESP Nativos, and Palmababo Advocacia, consistently meeting deadlines and ensuring high-quality results.

html5-removebg-preview
css3-removebg-preview
descarga
wordpresss-removebg-preview
elementor-removebg-preview
woocomerce-removebg-preview

Factory Assistant

2025

Bollinghaus Steel

Provided support in the steel transformation process, assisting with production tasks, materials handling, and basic quality control to ensure operational efficiency. Prepared and organized supplies, assisted with machinery maintenance, and ensured compliance with industrial safety standards. Contributed to the smooth operation of the plant through teamwork, responsibility, and adherence to production procedures.

Factory Assistant

2024

Lusiaves

Supported plant production processes by performing operational tasks, including handling, sorting, and preparing products, while ensuring compliance with quality and hygiene standards. Assisted in machinery operation, maintained order and cleanliness in the work area, and adhered to safety regulations and internal procedures, contributing to efficient and continuous production.

Factory Assistant

2023-2022

Rustipan-Panidor

Provided support in the bread production process, including preparation, baking, packaging, and basic quality control. Adhered to hygiene standards, food safety regulations, and internal procedures, ensuring order, cleanliness, and smooth operation of the production area to maintain efficiency and quality at every stage.

Semi-specialized Factory Assistant

2022

S.I.E

Worked in the production area providing support throughout different stages of the manufacturing process. Assisted with the basic operation of industrial machinery, performed visual and technical quality control of plastic products, and handled packaging and order preparation. Followed established procedures, safety and hygiene regulations, and collaborated effectively with the production team to meet operational goals.

SOFTWARE PROGRAMMER

2021-2022

Maquinando

Developed and maintained e-commerce solutions on the VTEX platform, actively contributing to projects focused on high-traffic online stores. Responsibilities included developing new functionalities, customizing storefronts, integrating third-party services, and troubleshooting issues to ensure optimal performance and an efficient user experience. Collaborated with technical and business teams on projects for well-known brands such as Hogar Universal, Distrihogar, Vélez, and Auteco, consistently meeting quality standards, deadlines, and client requirements.

html5-removebg-preview
css3-removebg-preview
descarga
bootstrap-removebg-preview
jquery-removebg-preview
php-removebg-preview
SCSS-removebg-preview
descarga (11)
wordpresss-removebg-preview
VTEX-removebg-preview

E-commerce support agent

2020-2021

VTEX

Provided technical and functional support to clients using the VTEX platform, resolving issues through ticketing systems. Assisted in the configuration, operation, and troubleshooting of e-commerce-related problems, ensuring the smooth functioning of online stores. Collaborated with cross-functional teams to escalate complex cases and deliver efficient, high-quality service to clients.

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css3-removebg-preview
descarga
bootstrap-removebg-preview
jquery-removebg-preview
VTEX-removebg-preview

Telecommunications Technician

2016-2020

Media Commerce

Led and coordinated technical teams in fiber optic installation, maintenance, and deployment projects, ensuring adherence to schedules, quality standards, and safety regulations. Supervised field personnel, assigned tasks, verified proper fiber installation and splicing, and managed progress reports. Acted as a liaison between the technical team and the company to ensure operational efficiency and customer satisfaction.

Telecommunications Technician

2012-2016

Telebucaramanga

Led and supervised technical teams in residential telecommunications service installations over HFC networks, ensuring proper service connections in clients’ homes. Coordinated cable laying, signal testing, and setup tasks, assigned responsibilities to staff, and verified compliance with technical standards, quality, and safety regulations. Provided field support and ensured efficient, high-quality customer service.

IT Support

2008-2014

Abaco

Provided comprehensive technical support to users and work teams, including assembling and configuring PCs, and performing preventive and corrective maintenance on hardware and software. Managed the installation and administration of wired and wireless networks, configured devices, and diagnosed and resolved issues, ensuring operational continuity and optimal functioning of the IT infrastructure.

Projects

A collection of recent works and web developments

Skills

Tools and languages ​​that I master in my development stack

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HTML 5

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CSS3

javascript

JavaScript

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React

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PHP

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Astro

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JQuery

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SASS

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Tailwind

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Bootstrap

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VTEX

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WordPress

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Elementor

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woo

shopify

Shoppify

Contact me

Do you have a project in mind or want to collaborate? Send me a message, and I will get back to you as soon as possible.

Contact Details

E-mail

Yulius_13@hotmail.com

Phone

+351 960147853

Location

Portugal – Leiria


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    Julio Andres Castañeda Millán

    Front-end developer