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I'm Thales de Assis, a Full Stack Developer (Frontend-Focused) with 15+ years of experience building scalable web applications, internal platforms, and custom systems. I thrive in global teams and enjoy modernizing legacy code while delivering clean, accessible UI and maintainable code. I'm experienced in agile environments, mentoring teammates, and driving product-focused development. I enjoy turning complex requirements into reusable frontend patterns, collaborating with product and operations, and raising engineering quality through code reviews and thoughtful architecture.…I'm Thales de Assis, a Full Stack Developer (Frontend-Focused) with 15+ years of experience building scalable web applications, internal platforms, and custom systems. I thrive in global teams and enjoy modernizing legacy code while delivering clean, accessible UI and maintainable code. I'm experienced in agile environments, mentoring teammates, and driving product-focused development. I enjoy turning complex requirements into reusable frontend patterns, collaborating with product and operations, and raising engineering quality through code reviews and thoughtful architecture.

Thales de Assis

Full Stack Developer, Front-End Developer, Web Developer, +2

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I'm Thales de Assis, a Full Stack Developer (Frontend-Focused) with 15+ years of experience building scalable web applications, internal platforms, and custom systems. I thrive in global teams and enjoy modernizing legacy code while delivering clean, accessible UI and maintainable code. I'm experienced in agile environments, mentoring teammates, and driving product-focused development. I enjoy turning complex requirements into reusable frontend patterns, collaborating with product and operations, and raising engineering quality through code reviews and thoughtful architecture.…I'm Thales de Assis, a Full Stack Developer (Frontend-Focused) with 15+ years of experience building scalable web applications, internal platforms, and custom systems. I thrive in global teams and enjoy modernizing legacy code while delivering clean, accessible UI and maintainable code. I'm experienced in agile environments, mentoring teammates, and driving product-focused development. I enjoy turning complex requirements into reusable frontend patterns, collaborating with product and operations, and raising engineering quality through code reviews and thoughtful architecture.

Available to hire

I’m Thales de Assis, a Full Stack Developer (Frontend-Focused) with 15+ years of experience building scalable web applications, internal platforms, and custom systems. I thrive in global teams and enjoy modernizing legacy code while delivering clean, accessible UI and maintainable code.

I’m experienced in agile environments, mentoring teammates, and driving product-focused development. I enjoy turning complex requirements into reusable frontend patterns, collaborating with product and operations, and raising engineering quality through code reviews and thoughtful architecture.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Portuguese

Fluent

English

Advanced

Work Experience

Frontend Developer (Remote) at Symplicity

May 1, 2020 - January 1, 2026

Develop and maintain large-scale web applications globally using Angular and PHP-based legacy systems. Built an internal Planning Poker application (real-time, Socket.IO-based) to improve sprint estimation and collaboration. Improved UI consistency and accessibility across modules while integrating with legacy codebases. Contributed to long-term modernization efforts by introducing reusable frontend patterns and components. Onboarded new hires, participated in technical interviews and code reviews, helping maintain engineering quality. Recognized with Certificate of Excellence and selected as HQ Club Winner, earning a company-sponsored trip to the US headquarters.

Fullstack Developer at CUREM - Medical Training Center

November 1, 2017 - April 1, 2020

Led frontend modernization of a large platform, migrating from AngularJS to Angular 7 and backend from PHP to Laravel. Developed core system modules including payments, refunds, enrollment, certificates, and financial reports. Integrated third-party services such as RD Station, Jiva ERP, PagSeguro, and Correios API. Worked in SCRUM and Kanban environments, collaborating closely with product and operations teams. Mentored developers and helped define frontend architecture and UI standards.

Fullstack Developer / Team Lead at Publix Comunicação - Marketing Agency

May 1, 2016 - November 1, 2017

Delivered full-cycle development of websites and internal business systems. Integrated e-commerce solutions using PayPal, PagSeguro, and Moip. Developed tools to speed up the process of creating content management for the client’s websites. Acted as technical lead for a team of 3 developers, providing guidance, code standards, and architectural direction.

Fullstack Developer at Agência Penta & Lazuli Studio - Marketing Agencies

September 1, 2011 - November 1, 2015

Built dozens of custom websites from design to deployment using HTML, CSS/SCSS, jQuery, PHP, and MySQL. Created WordPress themes and custom CMS solutions. Ensured cross-browser compatibility, including legacy browsers (IE6/IE7) early in career. Managed hosting environments, deployments, and DNS configurations.