Guilherme Simi Müller, PSD to HTML Developer in Curitiba - State of Paraná, Brazil
Guilherme Simi Müller

PSD to HTML Developer in Curitiba - State of Paraná, Brazil

Member since August 8, 2016
Guilherme is a full-stack developer with a passion for HTML and CSS. He specializes in structuring and coding handcrafted web pages. With his graphic design background, he's mastered the process of converting a design into a functional website. He has over a decade of experience in freelancing full-time for clients of various business types and is an instructor at SitePoint Premium where he's published successful courses and screencasts.
Guilherme is now available for hire




Curitiba - State of Paraná, Brazil



Preferred Environment

Git, Sass, MySQL, PHP, HTML

The most amazing...

...project I've worked on is the entire back-end, front-end, design and maintenance of an investments portal; with two websites being governed by one system.


  • Owner | Developer

    2007 - PRESENT
    Guilherme Müller Web Design
    • Freelanced full-time for hundreds of clients on jobs ranging from front-end development to full-stack web application development.
    • Created and developed the front end and back end of an investment and financial education website with an eCommerce and online course system.
    • Developed the front end and back end for a web application that acts as the middleman between furniture shops, designers, architects, and factories.
    • Created and developed the front end and back end for a travel agency and operator; completed with a complex and personalized eCommerce system.
    • Worked together with many local design studios on front-end and back-end development.
    Technologies: MySQL, PHP, JavaScript, Sass, CSS, HTML
  • Freelance Web Developer

    2018 - 2018
    Guest-Rm LLC (via Toptal)
    • Worked together with a Toptal designer (Csaba Házi) to completely redesign this existing website.
    • Reorganized and improved the original Laravel back end to offer users a new way to share their homes with their families.
    • Integrated a Facebook login and Google Contacts so that it's easier for users to sign up, log in, and invite their friends.
    • Implemented a payment solution to process credit card information and transactions securely.
    • Configured the front end with necessary tooling and designs; also added responsiveness.
    Technologies: MySQL, PHP, Laravel, JavaScript, Sass, CSS, HTML
  • Graphic Designer | Web Designer | Developer

    2005 - 2006
    Nexo Design
    • Worked with print and web design and development, which allowed me to understand both the designer's and the developer's world.
    • Designed and developed websites for many clients. Pioneered the use of CSS layouts at the agency.
    • Collaborated with others on the packaging design for a new brand of organic food.
    • Designed a 200-page catalog for a major company in Brazil's lighting market.
    Technologies: MySQL, PHP, JavaScript, CSS, HTML, Adobe InDesign, Adobe Photoshop
  • Graphic Designer | Web Designer | Developer

    2004 - 2005
    Confraria do Design
    • Collaborated with print, web design, and development which allowed me to get a good grasp of what graphic design was all about.
    • Designed and developed a Flash website for a major shopping mall and, in a future opportunity for the same client, I built an HTML and CSS version.
    • Designed and developed a Flash website for an important Brazilian design magazine, having later developed an HTML and CSS version. This was one of the first websites on the local market to be "tableless"—using CSS, not HTML tables, for the layout.
    • Designed and developed Confraria's website with a "tableless" front-end approach.
    • Worked on print designs for major local companies.
    Technologies: JavaScript, CSS, HTML, ActionScript, Flash, Adobe Photoshop


  • Guest-Rm

    Guest-Rm (pronounced "guest room") presents a new way to host friends and family.

    The website offers users the possibility to build a trusted network of friends so they can reserve each other's homes, with the unique feature of having a one-time fee of $20 per reservation, no matter the number of guests and of nights they stay.

    Together with the Toptal designer, Csaba Házi, we went back to the drawing board and completely redesigned and redeveloped this existing website with many more features and a better user experience.

  • G9 Investimentos

    This is an investment and financial education website that was designed and developed by me. There's one system that governs both sites (G9 Education and G9 Investments) and it has eCommerce and online course components.

    The website is available in Portuguese.

  • Amplitur Turismo

    This is a travel agency and operator website that was designed and developed by myself. It has custom eCommerce and content management systems which serve thousands of customers.

    The website is available in English, Portuguese, and Spanish.

  • Nos Furniture

    This website was developed to bring together elite furniture designers, shops, architects, and factories. It has a simple front end, designed and developed by other web professionals, but it has a custom back-end developed by me. It has different restricted areas for each kind of user, and a personalized eCommerce system tailored for business-to-business interactions.

    The front-end is available in English and in Portuguese due to a multi-language component that I developed.

  • Guilherme Müller Web Development Website

    My own website which I use for the promotion of my work, online courses, and classes. I also use it to test new technologies, when time allows.

    The website is available in English and Portuguese.

  • Online Course | Build a Responsive Website from Scratch

    An online course that I developed for SitePoint Premium. In this course, I teach students to take a design and work their way to a finished HTML, CSS, and JavaScript front-end. This course is a modern take on my previous "website building" class and also goes over how to use Node.js, Npm, Gulp, and Sass to automate the development workflow.

    More than 2,000 students have taken the course so far.

  • Online Course | Introduction to HTML

    This is an online course developed for SitePoint Premium.
    It teaches the basics of the HTML language and is featured on one of the main learning paths.

    It currently has thousands of students enrolled.

  • Online Course | Getting Started with HTML Media

    This is an online course developed for SitePoint Premium. It teaches how to work with the video and audio HTML tags.
    It has over 1,000 students enrolled.

  • Online Course | Putting it Together: Building a Website

    This is an online course developed for SitePoint Premium. It teaches the process of turning a design into a HTML/CSS webpage. Over 1,500 students have taken this course.

  • HTML and CSS Screencasts

    Here you can find intermediate to advanced-level screencasts that I created for SitePoint Premium.


  • Languages

    HTML, CSS, SQL, PHP, Sass, JavaScript, ActionScript
  • Frameworks

    CodeIgniter, PHP MVC, Laravel, Laravel Mix
  • Other

    PSD Slicing, PSD to HTML
  • Libraries/APIs

    jQuery, Vue.js, Vue.js 2, Node.js
  • Tools

    Gulp.js, Git, Adobe InDesign, Flash, Adobe Photoshop
  • Paradigms

  • Storage



  • Certificate in An Introduction to Interactive Programming in Python
    2015 - 2016
    Rice University via Coursera - Online
  • Certificate in Principles of Computing
    2015 - 2015
    Rice University via Coursera - Online
  • Master's degree in Business Administration
    2013 - 2015
    EBS Business School - Curitiba, Brazil
  • Bachelor's degree in Graphic Design
    2003 - 2007
    Federal University of Paraná (UFPR) - Curitiba, Brazil

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