CriarMusicas

CriarMusicas is a web application I built to generate personalized AI-powered songs for loved ones. The user records a story about their relationship, and the platform turns it into a unique song — lyrics and melody included.

How it works

1. Record: the user types the name of a person and records an audio telling the story of the relationship.
2. Compose the music: the AI pipeline uses the information provided to create a full song, and FFmpeg stitches custom jingles into the final track.
3. Share: the finished song is delivered to the user, ready to be shared with their loved one.

Architecture

The project is organized as a Turborepo monorepo with a clear split between backend and frontend:

• Frontend — Next.js 15 + React + TypeScript, styled with TailwindCSS and internationalized with next-intl for multi-language support.
• Backend — Node.js + Express + TypeScript, using Drizzle ORM on top of PostgreSQL.
• Payments — Stripe integration with a credit system, plus a free trial mode that delivers watermarked songs.
• Auth — OAuth login flows for a frictionless sign-up.
• Audio pipeline — all glued together with FFmpeg for post-processing.
• Deployment — PM2 process manager running on AWS Lightsail, with automated deploy scripts and reverse proxy configuration (Nginx / Apache).

What I did

I designed and implemented the whole product end-to-end:

• Product definition, UX and visual identity;
• Monorepo setup with Turborepo and shared packages;
• Backend API, database schema and migrations (Drizzle + PostgreSQL);
• Integration with AI apis
• Audio processing pipeline with FFmpeg (intro/outro jingles, watermarking);
• Credit system and Stripe billing, including the free-trial flow;
• Frontend in Next.js with i18n and responsive design;
• Deploy automation on AWS Lightsail with PM2 and zero-downtime reloads.

Check it out at https://criarmusicas.com.br