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ABOUT

SUMMARY

I'm a full-stack software engineer working at the intersection of engineering, product, and AI. My background combines scalable web and mobile development with applied experience integrating LLMs, Generative AI, and AI Agents into real product environments.

I focus on building AI-powered features that are usable, reliable, and aligned with user and business value. I enjoy collaborating with designers and product teams, translating complex technical challenges into intuitive and human-centered experiences. My work spans platform modernization, architecture evolution, performance optimization, and product experimentation, always with an emphasis on usability, system quality, and real-world impact.

Currently, I'm especially interested in roles where I can contribute to the design and development of AI Agents, intelligent interfaces, and applied LLM solutions that enhance digital products and improve user workflows at scale.

CONTACT

+55 11 97635-1481

jpmmatias@gmail.com

LINKEDIN

GITHUB

IN NUMBERS

5+

YEARS OF EXPERIENCE

Building products that matter

8X

PRODUCTIVITY INCREASE

Architecture improvements at RD

70%

LOAD TIME REDUCTION

Wellhub AI optimization

19.7K

MONTHLY ACTIVE USERS

Wellhub AI Chat platform

7

COMPANIES

From startups to enterprise

10+

RECOMMENDATIONS

From colleagues and leaders

CAPABILITIES

FRONTEND

Building performant, accessible interfaces with modern frameworks

  • REACT
  • NEXT.JS
  • TYPESCRIPT
  • TAILWIND CSS
  • RADIX UI
  • CSS-IN-JS

MOBILE

Cross-platform mobile development with native performance

  • REACT NATIVE
  • ANDROID
  • KOTLIN
  • KMP

BACKEND & AI

Scalable services and AI-powered solutions

  • NODE.JS
  • PYTHON
  • RUBY ON RAILS
  • LANGCHAIN
  • REST/GRAPHQL
  • LLM INTEGRATION

EXPERIENCE

WELLHUB

Software Engineer

May 2025 - Present

New York, United States

Channels Integration (CARE) team - Wellhub AI

  • Led the frontend implementation (SSR) of the Wellhub AI In-App Chat, focusing on performance, usability, and reliability in AI-powered conversational experiences
  • Improved rendering performance for long message threads, reducing load time by 70% (from ~137s to ~40s) and decreasing memory usage by 17.7%
  • Delivered the Quick Reply feature, which became the platform's top user intent, representing 41.5% of clicks and increasing conversation depth. The system successfully supported 19.7k MAU in October
  • Implemented integration with the AI Consent Management system and defined Feature Flag protocols to enable secure and controlled rollouts

RD

Senior Software Engineer

November 2023 - May 2025

São Paulo, Brazil

  • Participated in the company's large-scale platform modernization and rebranding initiative
  • Architected key user experience flows across core product areas (Home, PDP, Profile)
  • Delivered architecture improvements that increased engineering productivity by 8x
  • Worked closely with product and design teams to accelerate feature delivery and experimentation
  • Helped shape foundations for iterative and AI-enabled development workflows

HOSPITAL ALBERT EINSTEIN

Full Stack Engineer

December 2022 - November 2023

São Paulo, Brasil

  • Developed modern microfrontend interfaces for hospital eligibility system using React.js, TypeScript, and Styled Components
  • Implemented microservices for contract management using Kafka, Node.js, Docker, and Kubernetes
  • Applied microservices architecture principles to ensure system scalability and resilience
  • Utilized agile methodologies (Scrum, Kanban) and CI/CD practices
  • Performed RESTful API integrations and implemented unit testing with Jest

DISCOVER

Frontend Software Engineer

June 2022 - December 2022

  • Developed Next.js applications with server-side rendering to improve performance and SEO
  • Built reusable React and TypeScript components
  • Improved Lighthouse performance and accessibility
  • Contributed to UI consistency and responsive experience across the platform

REBASE

Full Stack Engineer

May 2021 - June 2022

Vindi (Recurring Payments Leader in Brazil)

Onboarding team

  • Maintained Ruby on Rails monolith for subscription and billing flows
  • Refactored legacy interfaces to React and improved test coverage with TDD

Risk team

  • Built internal financial risk analysis tools in collaboration with domain experts
  • Designed intuitive interfaces for complex decision workflows
  • Ensured scalability for high-volume transaction data

PETIZE

UX/UI Designer

June 2020 - May 2021

  • Strengthened product thinking and usability perspective

CNPQ

Research Fellow

August 2019 - October 2020

  • Studied user-centered design in AI systems, usability, ethics, and adoption

EDUCATION

UNIPDS

Postgraduate Degree, Applied AI Software Engineering

December 2025 - December 2026

PUC MINAS

Associate's degree, Computer Systems Analysis

August 2023 - September 2025

PONTIFÍCIA UNIVERSIDADE CATÓLICA DE SÃO PAULO

Bachelor's degree, Interaction Design

2018 - 2021

CAMPUS CODE

Bootcamp, Fullstack Development Ruby On Rails

March 2021 - August 2021

WHY ME

I had the opportunity to work with João at RD and it was one of the best experiences I've had with a team colleague. Besides being an extremely competent professional with impressive technical expertise, João is someone who truly cares about the people around him and the impact of what he's building...

Leandro de Brito Gonçalves

Full Stack Developer | React.js, Node.js, DevOps, AI Solutions

I combine technical depth with product thinking to deliver solutions that create real impact. My approach bridges the gap between complex engineering challenges and intuitive user experiences.

TESTIMONIALS

What colleagues say about working with me

I had the pleasure of working with João Pedro Matias on our development team, and I can say with complete certainty: he made a difference. Extremely competent, collaborative, and with a sharp eye for technical details and intelligent solutions. He al...

Sérgio Deiró

Tech Lead Mobile | Front-end - React Native, React.js, Node.js

I've been working on the same team as João since November 2023. He is an excellent developer with great technical expertise in both frontend and backend for frontend (BFF). He was fundamental to my professional development, being one of the people wh...

Vinicius Andrade

Mobile Developer | React Native

Currently, I have the privilege of working alongside João Pedro at RD, where he acts as a senior developer. His technical expertise, combined with a strategic and solution-oriented mindset, makes him a top-level professional. João Pedro stands out no...

Maria das Graças

Front-End Developer | React.js, React Native, TypeScript, Next.js

It is a privilege to recommend João Pedro Matias as an excellent Senior Software Engineer. I had the opportunity to work with João Pedro at RD, where he plays a fundamental role in the development and maintenance of applications that drive the compan...

Aton Bertini Dornfeld

Software Engineer - AI Engineer

I had the pleasure of working with João at Rebase. He is a dedicated and resilient professional, and with his technical skills, he always worked efficiently on developing solutions and shared his knowledge with the team. Since we worked at a consulti...

Kelly Cruz

Full-Stack Developer | Ruby on Rails | ReactJs | Python

João Pedro is a highly qualified professional. Responsible, reliable, dedicated, and with very good technical capacity. Always very hardworking to complete tasks and constantly seeking to improve his knowledge, sharing and contributing to the evoluti...

THIAGO RIBEIRO

Software Engineer Full Stack

It was a privilege to work with João, a proactive person who no matter what's happening, will always have time to help their teammate. Very experienced and always opts for the path that won't cause bottlenecks in the future. He has a very good unders...

Guilherme Nobrega

Frontend Developer | ReactJS | React Native | AngularJS | Next.js

João is an excellent professional. When we worked together, his evolution was clear, demonstrating vast technical knowledge and always seeking to learn more. He is always willing to help others when necessary, achieving excellent performance in the p...

Patrick Santos

Software Engineer | Ruby on Rails | Cybersecurity | React

Very good professional, competent, pleasant, talented, and an excellent friend.

Leonardo Tadeu Mantovani

Senior Java Developer