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Kelvin Medeiros

@kelvinmedeiros

Message

I build scalable React interfaces, design systems, and iPad applications for complex operational products.

Brazil

Message

What I'm looking for

I'm interested in teams solving meaningful front-end problems, where I can build scalable interfaces, design systems, and reliable product experiences with engineers, designers, and product partners.

At Rx Redefined, I build and ship React applications for iPad and web that support administration and logistics operations. I own delivery from component architecture through production alongside teams in Brazil and the United States.

I design and maintain a shared library of 106 UI components, standardizing the design system and accelerating new screens across products. I also help improve project structure, patterns, performance, and code readability.

Previously at eSapiens, I led front-end work for a social platform with more than 26 million registered accounts, resolving recurring responsive-layout issues and refactoring legacy components into reusable patterns. At Kodde, I delivered front-end work for large-scale partner and internal products using React, Vue.js, WordPress, and Git.

I began building Swift features for an education platform serving 10,000 schools and 8 million students, and also developed ASP.NET and C# systems for municipal departments. I care about readable code, scalable systems, and reliable interfaces, and use AI-assisted workflows to speed up delivery, refactoring, and code review.

Experience

Work history, roles, and key accomplishments

Current

UI Engineer

Current

Rx Redefined

Feb 2021 - Present (5 years 7 months)

React applications for iPad and web running administration and logistics workflows. Teams split between Brazil and the United States.

- Build and ship React applications for iPad and web that run administration and logistics operations, owning delivery from component architecture through production.
- Design and maintain the company's shared UI component library, standardizing the design system a

Front-End Developer

eSapiens Tecnologia S.A.

May 2019 - Feb 2021 (1 year 9 months)

Front-end development for one of the company's flagship products: a social networking platform with 26M+ registered accounts.

- Led front-end development of the platform's user-facing experience, focused on usability, performance, and user success.
- Eliminated recurring responsive layout failures inherited from a large legacy codebase, restoring consistent rendering across mobile, tablet, and de

Front-End Developer

Kodde

Jul 2017 - Apr 2019 (1 year 9 months)

Technology studio delivering web products for partner companies and internal projects.

- Delivered end-to-end front-end for 3 large-scale projects across partner companies and internal products, using React, Vue.js, WordPress, and Git.
- Translated client requirements into responsive interfaces, owning delivery from project setup through launch.
- Established front-end practices reused across pro

Software Development Intern

MStech

May 2016 - May 2017 (1 year)

Education technology company — platform reaching 10,000 schools and 8M students nationwide.

- Served as iOS developer for one year, building and maintaining features in Swift for classroom and academic management workflows.
- Delivered iOS work for a platform operating at national scale, with the reliability requirements that come with a public education audience.

IT Intern

Prefeitura Municipal de Bauru

Jan 2015 - Dec 2015 (11 months)

Municipal government — internal systems and public-facing web platforms for city departments.

- Built and maintained features for the municipality's internal systems using ASP.NET, C#, and WebForms.
- Developed landing pages and complex web systems serving public-sector departments and citizens.
- Provided technical support to internal users across municipal departments.

Education

Degrees, certifications, and relevant coursework

CertiProf

Scrum Foundations Professional Certificate (SFPC)

Issued Jun 2020

Universidade do Sagrado Coração

Ciência da Computação, Tecnologia da Informação

2016 - 2019

CTI UNESP

Técnico, Informática

2013 - 2015

Descobri nesse colégio que a informática era o ambiente certo em que eu me encaixaria. Foram três anos de muita dedicação e orgulho do trabalho que desenvolvemos ali.