Willian Haas

Experienced Front-End Developer with 5 years of expertise in React and other modern front-end technologies such as TypeScript, GraphQL, Jest and Styled- Components. Proven ability to develop innovative solutions to complex problems.

Developed features for the next-gen AP web app using Typescript and modern React.
Increased developer efficiency by creating Lit Web Components and implementing such components on Storybook in React, Vue and Angular versions.
Implemented design system components using Material UI and Styled-Components.
Tested React components and hooks using Jest and React-Testing-Library.
Enhanced multiple modules by replacing custom grid elements using AG-Grid, improving performance by 30%.

Developed web apps for a health and travel insurance company used by millions of Canadians, reducing paper-based claims and improving user experience.
Enhanced the program search process for a university in California using React and consuming an Azure Cognitive Search back-end.
Refactored an e-commerce solution used by thousands of wineries worldwide using Styled-Components.
Improved data tracking and analytics by creating custom tags in Google Tag Manager and Google Analytics.
Created unit tests and end-to-end tests with Jest, Enzyme and Cypress.

Redesigned a legacy PHP web app used by representatives of a furniture manufacturer using the .NET MVC and .NET Web API.
Redesigned a legacy Apex application using .NET MVC and .NET Web API.
Conducted user feedback sessions to enhance next-gen web apps.

Created a program for developers to generate common source code files for the ERP.
Implemented features for the new ERP using .NET MVC.
Provided customer support and monitored the most requested features according to users' feedback.