Marcos – React Native, MongoDB, Next.js

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

• 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.

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

• 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.

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

• 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.

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

• 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.