Willian Dos Reis, Developer in Buenos Aires, Argentina
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Willian Dos Reis

Verified Expert  in Engineering

Shopify Developer

Buenos Aires, Argentina
Toptal Member Since
February 11, 2021

Willian is a freelance web developer specializing in Shopify. He's worked with Shopify plus accounts, developed themes from scratch with Slate or the Shopify theme kit, and created private and public apps. Along with several years of hands-on experience, Willian has an eye for detail in his visual presentations and always develops with a responsive design in mind. Willian has delivered several apps—building them from the beginning while working with teams to design new features.


CSS3, HTML, JavaScript, Ruby, Liquid, REST, GraphQL, React, Tailwind CSS...
Arteta LLC
HTML5, CSS3, Bootstrap, Ruby, Node.js, React, Gulp, Next.js, Koa, Liquid...
Mujeres Audiovisuales
Laravel, Vue 2, PostgreSQL, HTML5, CSS3, Webpack, Pusher




Preferred Environment

MacOS, Slack, GitHub, Jira

The most amazing...

...thing I've developed is a public Shopify app called Activate Account App. I've also worked on many private Shopify apps.

Work Experience

Main Shopify Full-stack Developer

2021 - 2022
  • Participated in defining the architecture and adapting the platform to create a B2B marketplace from scratch that currently has thousands of registered users and more than 1,000 suppliers from different business segments.
  • Engaged as the 1st developer of the startup and employee number five; was part of the company path that led it to raise a seed round, Series A, and Series B, raising more than USD 80 million in total.
  • Formed an excellent team and worked in an agile way to create a product that helps change the lives of millions of small entrepreneurs in Brazil and throughout Latin America.
Technologies: CSS3, HTML, JavaScript, Ruby, Liquid, REST, GraphQL, React, Tailwind CSS, Shopify Plus, Shopify API, Shopify

Shopify Full-stack Developer

2018 - 2021
Arteta LLC
  • Worked as a full-stack developer and led the updates and customization of the existing sites (mainly new features and workflows).
  • Tracked the new features and bugs using Trello as a reporting-and-organizing tool.
  • Built new branded websites as the company grew; also developed three private apps and one public app.
Technologies: HTML5, CSS3, Bootstrap, Ruby, Node.js, React, Gulp, Next.js, Koa, Liquid, Shopify Plus, Shopify API, Shopify

Full-stack Developer

2018 - 2019
Mujeres Audiovisuales
  • Defined the architecture to be used and also developed the platform’s back end and front end with other two developers.
  • Tracked the new features and bugs using Trello as a reporting-and-organizing tool.
  • Coordinated the development of a messaging module with Pusher; also implemented the project on the production servers.
Technologies: Laravel, Vue 2, PostgreSQL, HTML5, CSS3, Webpack, Pusher

Front-end Developer

2015 - 2017
Ministerio de Modernizacion
  • Developed the website's front end which consumed the data from an API provided by another team and showed all that information in a user-friendly manner.
  • Tracked the new features and bugs using Trello as a reporting-and-organizing tool.
  • Oversaw the launch which handled more than 200,000 requests that day.
Technologies: HTML5, CSS3, Angular

Full-stack Developer

2014 - 2016
  • Worked as a full-stack developer for a generic brand ERP; it mainly invoiced and documented audits, stock handling, checkout, customers, checking accounts, and reports.
  • Tracked the new features and bugs using Trello as reporting and organizing tool.
  • Implemented the back-end architecture as well as front-end information consumption.
Technologies: Groovy, Grails, CSS3, HTML5, Sass, PostgreSQL

Alas App

The Alas app is an augmented reality (AR) mobile application that enables the user to discover and observe the native butterfly species from the Rio de la Plata area in 3D as well as to add information.

I worked with another developer to build this app from scratch while following the technical specifications from the National Farm Technology Institute. I adapted 3D models to Vuforia's augmented reality environment.


Savetrack is a product presentation built in WordPress for a national startup that developed a product that detects when a driver, primarily truck drivers, is fatigued or is close to falling asleep at the wheel; it has central monitoring that informs on the situation in real-time. I developed the site in WordPress and implemented several plugins including a multi-language one since the site is in Spanish, Portuguese, English, and Chinese.


HTML, CSS, PHP, JavaScript, Sass, JavaScript 6, R, Java, HTML5, CSS3, Ruby, Groovy, C#, GraphQL


Shopify Plus, Trello, Slack, GitLab, Gulp, Webpack, GitHub, Jira


Scrum, REST


Shopify, Heroku, MacOS, Vuforia, WordPress


Laravel, React Native, Next.js, Bootstrap, Koa, Angular, Grails, Unity, Tailwind CSS


Shopify API, jQuery, Node.js, React, React Native for Web, Vue 2, Pusher, Liquid


MySQL, PostgreSQL


PSD, Agile Coaching, Group Management, Web Logic, Augmented Reality (AR)

2016 - 2021

Bachelor's Degree in Digital Technologies

Universidad Nacional de Lanús - Lanús, Buenos Aires, Argentina

2011 - 2014

Technical Degree in Web Development

Universidad Nacional de La Matanza - San Justo, Buenos Aires, Argentina

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