Marcelo is available for hire
Hire MarceloMarcelo Augusto
Verified Expert in Engineering
React Developer
Curitiba - State of Paraná, Brazil
Toptal member since April 7, 2022
Bio
Marcelo is a senior full-stack engineer with 15 years of experience building scalable web and mobile applications. He specializes in Python back-end development and React-based front ends, with strong hands-on experience integrating Generative AI solutions using LLMs (including Anthropic), RAG pipelines, and AI-driven automation. Marcelo owns features end-to-end, designs clean APIs, and collaborates closely with cross-functional teams to deliver production-ready solutions.
Portfolio
Rafid Information Technology Company
React Native, Node.js, TypeScript, PostgreSQL, WebRTC, React Query, BullMQ...
DecisionMe Inc.
Python, HTMX, FastAPI, PostgreSQL, Tailwind CSS, OAuth, OpenAI API, Git...
TeamPass, Inc
React Native, Expo, TypeScript, Expo.io, App Development, APIs, JavaScript...
Experience
- JavaScript - 15 years
- Full-stack Development - 15 years
- Python - 10 years
- Node.js - 10 years
- React - 8 years
- React Native - 6 years
- Large Language Models (LLMs) - 3 years
- Artificial Intelligence (AI) - 2 years
Work Experience
Full-stack Developer
2025 - 2026
Rafid Information Technology Company
- Designed and built a scalable back end from scratch to support real-time video calls with 9+ concurrent participants per room, ensuring low latency and high reliability.
- Integrated and orchestrated a LiveKit-based audio and video streaming, managing room lifecycle, participant state, and reconnection flows.
- Architected a real-time communication layer using WebSockets and Socket.io, enabling instant synchronization of events, presence, and call state across all users.
- Implemented a custom real-time interaction system, including synchronized emoji reactions, without impacting video or audio performance.
- Developed a cross-platform mobile application using React Native (Expo), tightly integrated with real-time back-end services.
- Solved complex real-time edge cases, including concurrency issues, race conditions, network instability, and participant reconnections.
- Optimized real-time message throughput and latency, maintaining a smooth experience under high-frequency event traffic.
- Established a complete DevOps pipeline, with automated deployments, environment management, and CI/CD workflows.
- Implemented unit and integration testing for real-time logic, improving platform stability and preventing regressions.
- Took full ownership of the real-time platform, from system architecture and development to deployment, monitoring, and ongoing improvements.
Technologies: React Native, Node.js, TypeScript, PostgreSQL, WebRTC, React Query, BullMQ, Prisma, LiveKit, TanStack Table, Socket.IO, NestJS, Ruby on Rails (RoR), Artificial Intelligence (AI), Large Language Models (LLMs), Full-stack Development, Slack, API Integration, Code Review, Technical Leadership, Dashboards, SMS, Back-end Development, Webhooks, LangGraph
Full-stack Developer
2025 - 2025
DecisionMe Inc.
- Designed and delivered a dynamic prompt management tool that allows non-technical users to create, update, and integrate AI prompts across the system without developer involvement.
- Implemented AI-powered reporting features that generate intelligent, contextual responses and insights directly from application data.
- Integrated Anthropic and OpenAI models to build a reusable AI assistant embedded into multiple decision-making stages of the client’s workflow.
- Resolved critical back-end and front-end issues by improving system stability and performance using FastAPI and HTMX.
- Enhanced the overall user interface and user experience, making complex AI-driven features more intuitive and accessible.
- Architected a flexible AI integration layer, enabling rapid experimentation and safe adoption of different LLM providers.
- Improved system maintainability and scalability by refactoring key components related to AI workflows and data handling.
- Collaborated closely with stakeholders to align AI-assisted features with real business decision processes, increasing adoption and operational efficiency.
Technologies: Python, HTMX, FastAPI, PostgreSQL, Tailwind CSS, OAuth, OpenAI API, Git, Stripe API, Next.js, JavaScript, Anthropic, RAG Pipelines, Artificial Intelligence (AI), Large Language Models (LLMs), Full-stack Development, Slack, API Integration, Supabase, Code Review, Dashboards, SMS, Back-end Development, Webhooks, OpenAI
React Native (Expo) Developer
2025 - 2025
TeamPass, Inc
- Led a major framework upgrade from Expo SDK 48 to 54, resolving breaking changes, updating dependencies, and restoring full build stability across iOS and Android with minimal downtime.
- Identified and fixed multiple legacy bugs inherited from previous versions, improving app reliability, reducing crashes, and stabilizing core user flows that were previously inconsistent or error-prone.
- Modernized the application UI and UX, refactoring outdated components, improving visual consistency, and aligning the app with current design patterns to deliver a cleaner, more maintainable, and user-friendly interface.
Technologies: React Native, Expo, TypeScript, Expo.io, App Development, APIs, JavaScript, SDKs, GitHub, Debugging, Slack, API Integration, Code Review, SMS, Back-end Development, Webhooks
Senior React Native Developer
2025 - 2025
Vibrant Practice Inc
- Developed a cross-platform React Native application from scratch for Vibrant Practice, enabling patients to easily schedule appointments with healthcare providers through an intuitive and responsive interface.
- Implemented robust scheduling workflows, real-time appointment availability, and push notification reminders, improving user engagement and streamlining provider-patient communication.
- Owned the entire mobile development lifecycle, from architecture design to App Store and Play Store deployment, ensuring HIPAA-compliant practices and seamless back-end integration.
Technologies: React, React Native, Mobile Development, Expo, Next.js, Stripe, Fast Healthcare Interoperability Resources (FHIR), HIPAA Compliance, HIPAA Electronic Data Interchange (EDI), Medplum, HL7 FHIR Standard, Lovable, Python, Artificial Intelligence (AI), Full-stack Development, Slack, API Integration, Code Review, Technical Leadership, Dashboards, Back-end Development
Senior Full-stack Developer
2024 - 2025
Metalingo
- Implemented a full-featured summer program enrollment platform, enabling students to easily register for seasonal online language classes, boosting engagement and seasonal retention.
- Improved performance and stability of live class sessions by identifying key bottlenecks in real-time interactions, enhancing the overall learning experience for both students and instructors.
- Re-architected the real-time communication layer by replacing the existing Spring Boot WebSocket solution with a custom Node.js service, reducing latency and simplifying maintainability across the platform.
Technologies: Java, Spring Boot, React, TypeScript, Node.js, GitLab CI/CD, Kubernetes, OpenVidu, WebSockets, Socket.IO, Python, Artificial Intelligence (AI), Large Language Models (LLMs), WebRTC, Full-stack Development, Slack, API Integration, Code Review, Technical Leadership, Dashboards, Back-end Development
React Native Developer
2024 - 2024
Carrier - Residential - Mobile Apps Product Management
- Helped with the story creation in Jira and initial project organization to ramp up the other developers that joined later.
- Worked directly with the Monorepo, developing reusable components that could be integrated across multiple child mobile applications.
- Assisted other teammates in achieving their results and aligned expectations with different parts/sectors of the company.
Technologies: React Native, JavaScript, CSS, HTML, GraphQL, React, Monorepos, Nx, Twilio, Responsive UI, Bug Fixes, RESTFul APIs, Full-stack Development, Slack, API Integration, Code Review, Back-end Development
Senior Full-stack Developer
2024 - 2024
Liquid Compass
- Recruited to spearhead the project's refactoring initiative, strategically eliminating all AngularJS dependencies and seamlessly transitioning to React within a Laravel Vite resource environment.
- Built a whole feature that enables users to upload their resume, parse it, then save the data inside their profile.
- Solved a good number of bugs that involved working with WordPress and Laravel.
Technologies: React, AngularJS, JavaScript, HTML, SSH, Vite, Laravel, WordPress, Geocoding, FastAPI, Object-relational Mapping (ORM), AWS SDK, Svelte, HubSpot, DNS, htaccess, Artificial Intelligence (AI), Boilerplate Code, AWS IoT, Responsive UI, Bug Fixes, RESTFul APIs, Full-stack Development, Slack, API Integration, Code Review, Dashboards, Back-end Development
React Native Mobile Developer
2023 - 2023
Portal
- Changed the demo RN application design to the newest Portal Labs branding.
- Integrated the backup and recovery wallet feature from their API.
- Created a UI for the swaps feature, minor bug fixes, and SDK updates.
Technologies: React Native, JavaScript, Mobile Apps, Mobile App Development, SDKs, TypeScript, Cryptocurrency, Blockchain, Web3, Back-end, Google Play Store, App Store, Ethereum, GitHub Actions, Crypto, Tailwind CSS, Styled-components, Axios, Stripe API, Snowflake, Geocoding, Object-relational Mapping (ORM), DNS, htaccess, Artificial Intelligence (AI), Android, Boilerplate Code, NumPy, Responsive UI, Bug Fixes, RESTFul APIs, Full-stack Development, Slack, API Integration, Code Review, Dashboards, Back-end Development
Google SEO Expert
2023 - 2023
VettaFi, LLC
- Created a report of possible changes they can achieve in their SEO issues.
- Managed data and web tracking analysis on their blog posts.
- Worked on SEO and tracking improvements that could take the application to the next level.
Technologies: Google SEO, PHP, JavaScript, HTML, SEO Tools, WordPress, Seos, Object-relational Mapping (ORM), Yoast SEO, DNS, htaccess, Bug Fixes, Slack
PHP/React Developer
2022 - 2023
FlashParking, Inc.
- Managed to reduce the number of bugs produced by the product by a factor of 8, simply by refactoring and cleaning the code.
- Documented the entire system thoroughly during my first trimester and was able to assist the newly-hired tech leader in creating a successful modernization project plan.
- Created a solution using React and Node.js to import thousands of users via XLSX file import.
- Learned the new version of Laravel, which enabled me to assist with all the features we created in the modernization project.
- Worked on integrating the modernization project with the legacy codebase in a phased manner, with no significant risk to the company's product.
Technologies: PHP, React, JavaScript, Node.js, HTML, Laravel, CI/CD Pipelines, Git, Agile, Scrum, TypeScript, Ruby, Responsive Web Design (RWD), CSS3, OAuth 2, ECMAScript (ES6), DOM, JSON, Full-stack, Google SEO, PHP 7, Unit Testing, User Experience (UX), Payment APIs, Front-end Development, Material UI, Vanilla JS, DevOps, Full-stack Development, Mobile Development, Application State Management, Integration, SDKs, Web Usability, GitHub, Object-oriented Programming (OOP), JSON REST APIs, Front-end, Back-end, Amazon EC2, Doctrine, Design Systems, Styled-components, Axios, Stripe API, React Server Components, NoSQL, Geocoding, FastAPI, Object-relational Mapping (ORM), AWS SDK, Yoast SEO, DNS, htaccess, Web Scraping, Boilerplate Code, NumPy, Responsive UI, Bug Fixes, RESTFul APIs, Slack, API Integration, Code Review, Technical Leadership, Dashboards, Back-end Development
Senior Front-end Vue Engineer (Part Time)
2021 - 2022
Intelipost
- Helped with punctual front-end demands inside the company platform available to clients.
- Participated in clients' migration from AngularJS framework to a version using Vue.
- Worked on bug fixing depending on sprint performance.
Technologies: JavaScript, Vue, AngularJS, GraphQL, MongoDB, UI Components, Node.js, REST APIs, REST, Databases, APIs, Web Development, HTML, Bootstrap, Responsive Web Design (RWD), CSS3, ECMAScript (ES6), DOM, JSON, Full-stack, Google Maps, Google SEO, User Experience (UX), Front-end Development, Material UI, Vanilla JS, Full-stack Development, Ionic, Mobile Development, Vue 3, Pinia, Application State Management, Integration, SDKs, Web Usability, GitHub, JSON REST APIs, Front-end, Back-end, Nuxt.js, Design Systems, Mongoose, GitHub Actions, Testing, Axios, Angular, Object-relational Mapping (ORM), DNS, htaccess, NumPy, Responsive UI, Bug Fixes, RESTFul APIs, Slack, API Integration, Code Review, Back-end Development
Tech Lead and Full-stack Developer
2020 - 2022
Dr. Consulta
- Developed the new version of the clinic's website, which is currently in production.
- Led the entire development lifecycle, starting from one microservice that had returned a positive return on investment (ROI) for the company after its implementation.
- Trained junior and mid-level developers to act as full-stack engineers inside the company.
- Progressed to tech lead after acting as a senior full-stack software engineer.
Technologies: NestJS, Next.js, React, React Native, Python, HTML5, CSS, Android, iOS, Google Cloud Platform (GCP), Agile, Scrum, Kanban, Jira, PHP, Laravel, MySQL, SQL, Redux, Redux Thunk, Redux-Saga, React Redux, React Hooks, TypeScript, UI Components, Atomic Design, Node.js, Amazon Web Services (AWS), REST APIs, REST, Databases, CI/CD Pipelines, Docker, APIs, Kubernetes, Web Development, HTML, Video Streaming, Bootstrap, Responsive Web Design (RWD), CSS3, Socket.IO, WebSockets, Live Chat, Responsive Email Templates, Email Templates, ECMAScript (ES6), DOM, Express.js, JSON, Full-stack, Google Maps, Google SEO, Contentful, PHP 7, Unit Testing, User Experience (UX), Payment APIs, Front-end Development, Material UI, Vanilla JS, Tailwind CSS, Sass, Blockchain, Prisma, DevOps, Software Architecture, Architecture, Full-stack Development, Ionic, Mobile Development, User Interface (UI), Application State Management, Integration, SDKs, Web Usability, GitHub, Object-oriented Programming (OOP), JSON REST APIs, Stripe, Stripe Checkout, Front-end, Back-end, Google Play Store, App Store, Bubble, Low-code Development, Design Systems, Clojure, Seos, Vercel, Auth0, Firebase Hosting, GitHub Actions, Testing, Styled-components, Axios, Google Cloud Functions, Angular, NoSQL, Django, Object-relational Mapping (ORM), Yoast SEO, DNS, htaccess, Web Scraping, Boilerplate Code, NumPy, AWS IoT, Responsive UI, Bug Fixes, RESTFul APIs, WebRTC, Slack, API Integration, Code Review, Technical Leadership
Senior Front-end Engineer
2020 - 2020
Navita
- Started the new architecture inside the company, refactoring a legacy system developed in AngularJS to the Vue framework.
- Fixed some bugs in the legacy system related to the AngularJS framework, version one.
- Supported other junior and mid-level developers and undertook the responsibilities of a senior colleague during vacations.
Technologies: Vue, AngularJS, Android, HTML5, CSS, UI Components, Node.js, REST APIs, REST, Databases, Docker, APIs, Web Development, jQuery, HTML, Bootstrap, Responsive Web Design (RWD), CSS3, Responsive Email Templates, Email Templates, ECMAScript (ES6), DOM, JSON, Full-stack, Google Maps, Google SEO, Payment APIs, Front-end Development, Material UI, Vanilla JS, Sass, Full-stack Development, Ionic, Mobile Development, User Interface (UI), Application State Management, Integration, SDKs, GitHub, JSON REST APIs, Front-end, Back-end, Nuxt.js, Design Systems, Seos, Firebase Hosting, GitHub Actions, Axios, Angular, Object-relational Mapping (ORM), DNS, htaccess, Responsive UI, Bug Fixes, RESTFul APIs, Slack, API Integration, Code Review
Co-founder and Tech Lead
2016 - 2019
Metractive
- Helped build and lead various projects in the company, handling their architecture and daily development.
- Acted as a senior advisor for newcomer developers to the company, helping them to quickly solve problems.
- Launched more than five healthcare apps using React Native with external company partners.
Technologies: JavaScript, PHP, React Native, React, Python, CSS, HTML5, AngularJS, Amazon Web Services (AWS), MySQL, SQL, Ruby, UI Components, Node.js, PostgreSQL, REST APIs, REST, Databases, Docker, APIs, Ruby on Rails (RoR), Kubernetes, Django, Web Development, jQuery, HTML, Video Streaming, Bootstrap, Responsive Web Design (RWD), CSS3, Socket.IO, WebSockets, Live Chat, OAuth, Responsive Email Templates, Email Templates, Mobile App Development, ECMAScript (ES6), DOM, Express.js, JSON, Full-stack, Google Maps, Google SEO, Contentful, PHP 7, Symfony, Unit Testing, Framework7, User Experience (UX), Payment APIs, Front-end Development, Material UI, Vanilla JS, Firebase, Tailwind CSS, Sass, Storybook, Cypress, Blockchain, Prisma, DevOps, Software Architecture, Architecture, Full-stack Development, Ionic, Mobile Development, User Interface (UI), Application State Management, Integration, GitHub, Object-oriented Programming (OOP), JSON REST APIs, Azure, Stripe, DigitalOcean, Google Tag Manager, Swift, Stripe Checkout, Front-end, Chart.js, Cryptocurrency, Back-end, Expo, Nuxt.js, Amazon EC2, Expo.io, Google Play Store, App Store, Design Systems, Clojure, Seos, Mongoose, React Hook Form, Unity, RSS Feeds, Auth0, Firebase Hosting, GitHub Actions, Testing, Crypto, Flutter, HTMX, Stripe API, Styled-components, Laravel, Axios, Chrome Extensions, Offline Data Synchronization, Electron, Data Visualization, NoSQL, FastAPI, Object-relational Mapping (ORM), Flask, Yoast SEO, DNS, htaccess, Web Scraping, NumPy, SciPy, AWS IoT, Twilio, Heroku, Responsive UI, Bug Fixes, RESTFul APIs, WebRTC, Slack, API Integration, Code Review, Technical Leadership, Raspberry Pi, Embedded Linux, Internet of Things (IoT)
Senior Full-stack Engineer
2015 - 2015
Techmid
- Acted as an advisor to help managers gain knowledge about software explanation to clients and the path to pursue.
- Fixed bugs and created new features for projects that came to the company.
- Participated in a project that aimed to decrease the export time from hours to seconds with sheets automation.
Technologies: JavaScript, PHP, CakePHP 3, HTML5, CSS, CodeIgniter 3, UI Components, REST APIs, REST, Databases, APIs, Web Development, jQuery, HTML, Bootstrap, Responsive Web Design (RWD), CSS3, Responsive Email Templates, Email Templates, DOM, Full-stack, Google SEO, PHP 7, Front-end Development, Vanilla JS, Sass, DevOps, Full-stack Development, Integration, GitHub, JSON REST APIs, Google Tag Manager, Front-end, Back-end, RSS Feeds, DNS, htaccess, Bug Fixes, RESTFul APIs, Code Review
Project History
Dr. Consulta Platform in Next.js
Dr.Consulta is a platform for clinics created with Next.js for the front end and NestJS as the back-end API service. It overwrote the last platform version built with a mix of PHP and JavaScript. I've contributed to this project, first as a full-stack developer and later as a tech lead.
Naxia Mobile Application
Naxia is a React Native app created to schedule appointments and exams for patients interested in Naxia services. I acted as the mobile developer using the C# API provided by the client and integrating a club of benefits inside of it.
2bTrust Investing Platform
https://2btrust.com/The 2bTrust is a React Native app created to enable transactions between people interested in real estate investments. I was involved in the app development, communicating with the API provided by the client for financial transactions.
Decision Making AI Tool
https://decisionme.comDecisionMe is an AI-powered decision-support platform designed to enhance complex decision-making workflows. I led the integration of Anthropic and OpenAI models to build a reusable AI assistant embedded across multiple stages of the client’s process. I also created a dynamic prompt management system that allows non-technical users to create and deploy AI prompts without developer involvement. Additionally, I implemented AI-driven reporting, resolved system issues using FastAPI and HTMX, and improved the overall user interface and user experience.
Education
2015 - 2019
Bachelor's Degree in Computer Engineering
ESAMC Santos - Santos, São Paulo, Brazil
Certifications
DECEMBER 2019 - PRESENT
First Certificate in English (FCE) | B2 First
Cambridge Assessment English
JANUARY 2015 - PRESENT
Shaping Up With Angular.js
Pluralsight
JANUARY 2014 - PRESENT
Advanced Techniques in SEO
iMasters
JANUARY 2013 - PRESENT
WordPress Advanced Level
Apiki WP
DECEMBER 2010 - PRESENT
Web Design | HTML, CSS, and JavaScript
SENAI
JANUARY 2010 - PRESENT
PHP and MySQL
Tecnoponta
Skills
Libraries/APIs
React, Node.js, Vue, Redux-Saga, React Redux, REST APIs, jQuery, SendBird, Stripe, Socket.IO, Stripe API, WebRTC, WordPress API, Google Maps, Vue 3, Chart.js, React Hook Form, HTMX, NumPy, OpenAI API, Doctrine, OpenAI Assistants API, SciPy, React Query, TanStack Table
Tools
Redux Thunk, Git, GitHub, Xcode, Prisma, Geocoding, Slack, Gradle, Bubble, Stripe Checkout, Expo, Expo.io, Seos, Auth0, AWS SDK, Jira, Mongoose, Nx, GitLab CI/CD
Languages
PHP, JavaScript, Python, CSS, HTML5, SQL, TypeScript, HTML, CSS3, ECMAScript (ES6), PHP 7, Sass, GraphQL, C++, Ruby, Swift, Clojure, Snowflake, Java
Frameworks
React Native, Next.js, Laravel, CakePHP 3, Redux, Django, Bootstrap, OAuth 2, Express.js, Material UI, Vanilla JS, Tailwind CSS, LangGraph, AngularJS, NestJS, CodeIgniter 3, Symfony, Ionic, Nuxt.js, Angular 7, Angular, Electron, Svelte, Jest, Ruby on Rails (RoR), Framework7, Cypress, Unity, Flutter, Flask, Spring Boot
Paradigms
REST, Responsive Web Design (RWD), Mobile Development, Object-oriented Programming (OOP), Object-relational Mapping (ORM), Agile, Scrum, Search Engine Optimization (SEO), Design Patterns, Unit Testing, DevOps, Low-code Development, Testing, Kanban, Fast Healthcare Interoperability Resources (FHIR), HIPAA Compliance, HL7 FHIR Standard, App Development
Platforms
Android, Mobile, Amazon Web Services (AWS), Firebase, Contentful, Vercel, Raspberry Pi, Embedded Linux, Linux, Visual Studio Code (VS Code), iOS, Google Cloud Platform (GCP), WordPress, Docker, Blockchain, DigitalOcean, AWS IoT, Twilio, Heroku, Kubernetes, Azure, Amazon EC2, Ethereum, HubSpot, Medplum, OpenVidu, LiveKit
Storage
MySQL, PostgreSQL, Databases, JSON, NoSQL, MongoDB
Other
Programming, React Hooks, Front-end, User Interface (UI), UI Components, Atomic Design, APIs, Web Development, API Integration, Mobile App Development, OAuth, WebSockets, DOM, Full-stack, Payment APIs, Front-end Development, Full-stack Development, Application State Management, Integration, SDKs, JSON REST APIs, Back-end, Design Systems, Firebase Hosting, GitHub Actions, Styled-components, Axios, OpenAI, FastAPI, DNS, htaccess, Web Scraping, Boilerplate Code, Responsive UI, Bug Fixes, RESTFul APIs, Large Language Models (LLMs), Code Review, Dashboards, Internet of Things (IoT), Back-end Development, Webhooks, English, Mobile Apps, CI/CD Pipelines, Video Streaming, Email Templates, Responsive Email Templates, Live Chat, Google SEO, SEO Tools, Software Architecture, Architecture, Pinia, Web Usability, Google Tag Manager, Cryptocurrency, Web3, Google Play Store, App Store, RSS Feeds, Crypto, No-code Development, Chrome Extensions, Offline Data Synchronization, React Server Components, Yoast SEO, Artificial Intelligence (AI), Supabase, Lovable, Anthropic, RAG Pipelines, Technical Leadership, SMS, R Programming, Hardware, User Experience (UX), Storybook, Google Cloud Functions, Data Visualization, SSH, Vite, Monorepos, HIPAA Electronic Data Interchange (EDI), Debugging, BullMQ
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