Hi, I'm Junior Moreira.

Senior Front-End Engineer · Remote (US)

• Led frontend for a mobile-first healthcare platform using React, TypeScript, and AWS.
• Built patient dashboards and account management with React, REST APIs, and responsive UI patterns.
• Integrated AI-assisted recommendations and third-party APIs via external API integration.
• Improved mobile performance with lazy loading, reusable hooks, and optimized rendering.

Full Stack Developer · Remote (US)

• Built and scaled e-commerce and FinTech platforms using Next.js, React, TypeScript, and Tailwind CSS.
• Designed a GraphQL API gateway with Apollo, NestJS, and Redis, unifying data from multiple backends.
• Built backend services for transaction monitoring using NestJS, PostgreSQL, Redis, and event-driven patterns.
• Migrated legacy .NET services to Node.js/NestJS and set up Docker-based CI/CD pipelines.

Back-End Engineer · Remote, Contract (AR)

• Built backend services for an e-commerce SaaS using Python (FastAPI) for product, order, and auth flows.
• Designed and optimized data models in PostgreSQL and MongoDB for high-traffic endpoints.
• Implemented serverless components with AWS Lambda and API Gateway for scalable background jobs.
• Automated build and deployment workflows with CI/CD pipelines (GitHub Actions / Jenkins).

Software Developer · Remote (EC)

• Developed full-stack features using React and Node.js (Express) for e-commerce and SaaS applications.
• Built and maintained RESTful APIs for product catalog management, user authentication, and order processing.
• Designed relational data models in PostgreSQL with optimized queries for high-usage endpoints.
• Set up CI/CD pipelines (GitHub Actions / Jenkins), automating testing and deployment processes.