Problem

Mobile habit-tracking apps need opt-in cloud backup, cross-device analytics, and data exports without forcing continuous high infrastructure baseline costs.

Solution

A full-stack web application (React, Node.js, Fastify, Prisma, MySQL) with JWT refresh-token rotation, paired with Terraform AWS architecture patterns (ECS Fargate Spot live demo with ~77% cost savings, serverless Lambda with ~87% savings, and enterprise private VPC reference).

Responsibilities

• Designed and developed full-stack React web app and Node.js Fastify API with Prisma & MySQL.
• Implemented JWT access authentication with refresh token rotation and Zod schema validation.
• Built Terraform infrastructure modules for production-reference, live-demo, and serverless AWS deployments.
• Automated build and deployment pipelines using Docker and GitHub Actions.

Achievements

• Built production-grade full-stack cloud companion with full API and web dashboard.
• Modeled cost-optimized AWS infrastructure reducing idle demo costs by up to 87%.
• Implemented comprehensive security, authentication, and database migration architecture.

Technologies

• React
• TypeScript
• Node.js
• Fastify
• Prisma
• MySQL
• AWS
• Terraform
• Docker
• ECS Fargate
• GitHub Actions