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Marcos – React Native, MongoDB, Next.js, experts in Lemon.io

Marcos

From Brazil (UTC-3)flag

Mobile Developer|Middle-to-senior
Back-end Web Developer|Middle

Marcos – React Native, MongoDB, Next.js

Marcos is a Strong Middle Mobile Full-Stack Engineer with over 10 years of commercial experience, specializing in React Native development. Marcos combines a solid foundation in system engineering with practical backend skills using Node.js, Nest.js, and both SQL and NoSQL databases. He has led teams as a Tech Lead at an agritech startup and co-founded apps that scaled to over 2 million users. Marcos brings strong JavaScript/TypeScript expertise and a Computer Science degree to support his full-stack capabilities.

11 years of commercial experience
Main technologies
React Native
5 years
MongoDB
4 years
Next.js
6 years
Node.js
9 years
Typescript
6 years
MongooseODM
4 years
Additional skills
LangChain
AI
Python
Express.js
React
tRPC
Fastify.js
GraphQL
MySQL
Cloudflare
Tailwind CSS
AWS
Turborepo
Docker
PostgreSQL
LLM
Prisma
JavaScript
CI/CD
Cursor
Expo
Nest.js
PHP
Docker Compose
Direct hire
Possible
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Experience Highlights

Lead Full-Stack Engineer
Feb 2024 - Ongoing1 year 6 months
Project Overview

An agritech startup leveraging AI to optimize farming operations, boost efficiency, and drive sustainability in agriculture.

Responsibilities:
  • Led development of a scalable full-stack system in a TypeScript monorepo, leveraging React and Next.js for a dynamic frontend alongside Node.js, Fastify, and tRPC with hexagonal architecture for robust APIs, which reduced code duplication by 30% and accelerated feature delivery by 40%.
  • Designed and implemented a generative AI-powered conversational BI tool using Remix for dynamic data visualization, leading to more informed decision-making.
  • Developed a proprietary, vendor-agnostic AI agent framework, unifying horizontal business domains with specialized vertical agents, which enabled seamless agent handoffs to fulfill user requests using specific tools in the background, improving operational efficiency.
  • Implemented a secure, passwordless authentication system with OTP, reducing login friction and boosting user retention by 25%.
  • Automated CI/CD pipelines, cutting deployment times significantly and reducing production incidents.
  • Collaborated with cross-functional team members from Brazil, the USA, England, India, and Pakistan.
Project Tech stack:
React
Next.js
Node.js
Typescript
CI
CD
Fastify.js
tRPC
Remix
Cursor
AI
LLM
Tailwind CSS
Ionic
JavaScript
Python
SQL
PostgreSQL
Redis
Prisma
API
GitHub Actions
Docker
Docker Compose
Turborepo
AWS
Cloudflare
CDN
DigitalOcean
LangChain
Senior Software Engineer
Jan 2020 - Dec 20233 years 11 months
Project Overview

A software consultancy specializing in the end-to-end development of custom web and mobile applications for a diverse client portfolio.

Responsibilities:
  • Architected and led the development of a mobile e-commerce app with React Native and Expo, integrating with a GraphQL back-end that increased the average order value by 20% and boosted conversion rates by 35% over the existing mobile website.
  • Engineered a CI/CD pipeline using Expo Over-the-Air (OTA) updates and GitHub Actions, enabling instant feature releases and bug fixes directly to users, bypassing app store review delays.
  • Developed a robust, offline-first research application in React Native with an on-device SQLite database, which cut data analysis time from weeks to hours and reduced data entry errors by over 90%.
  • Developed a web-based Business Intelligence app with a React front-end and a NestJS back-end, enabling real-time insights and improving decision-making accuracy.
Project Tech stack:
React
Nest.js
Vue.js
React Native
Expo
Tailwind CSS
PostgreSQL
MongoDB
MongooseODM
Typescript
Android
iOS
Next.js
Vuex
Node.js
Express.js
JavaScript
SQL
MySQL
NoSQL
Prisma
Redis
GraphQL
API
Cypress
Jest
CI
CD
GitHub Actions
Docker
Docker Compose
AWS
Cloudflare
CDN
RabbitMQ
Senior Full-Stack Developer
Aug 2017 - Dec 20192 years 4 months
Project Overview

An entertainment startup with high reach through viral content on social networks.

Responsibilities:
  • Designed and built a back-office platform, leveraging React for the user interface and Node.js for the back-end, significantly increasing content generation capabilities and improving workflow efficiency by 60%.
  • Integrated Facebook's GraphQL API, delivering personalized content recommendations to a React-based user interface that boosted user engagement and organic traffic.
  • Optimized SEO for content delivered through React applications, leading to over 1,000,000 users in a few weeks through improved search rankings and discoverability.
  • Developed a marketing campaign management tool leveraging Node.js for automated ad control (Facebook/Google Ads APIs), providing real-time insights and adjusting ads based on ROI.
  • Implemented a notification system, increasing organic traffic by 30-35% during off-peak hours.
Project Tech stack:
React
Node.js
GraphQL
MySQL
Bash
OneSignal
Tailwind CSS
Vue.js
Python
JavaScript
SQL
API
Jest
AWS
Full-Stack Developer
Jan 2014 - Jul 20173 years 6 months
Project Overview

Acted as an Independent consultant, creating custom web and e-commerce solutions across industries.

Responsibilities:
  • Managed end-to-end projects from ideation to execution, consistently delivering 100% on time, resulting in high client satisfaction scores.
  • Engineered bespoke web applications using Node.js for robust back-end development, ensuring high performance and scalability for client-specific needs.
  • Developed custom websites and e-commerce platforms, leveraging PHP and Laravel for scalable back-ends, and specialized platforms like WordPress and Magento for comprehensive e-commerce solutions, significantly enhancing clients' digital presence.
  • Delivered high-quality, cloud-based systems within budget, ensuring reliability, scalability, and performance optimization for various clients, increasing client satisfaction and repeat business.
Project Tech stack:
Node.js
PHP
Laravel
Magento
WordPress
MySQL
SQL
Cloudflare
CDN
jQuery
JavaScript

Education

2022
Computer Science
Bachelor's

Languages

Portuguese
Advanced
Spanish
Advanced
English
Advanced

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