Projects

Real business and technical labs

All work in more detail

Grocery storefront with WhatsApp CTA on Cloudflare Workers Free
Storefront for a real business, Mercearia Ricardo Aragão: editable catalog and WhatsApp chat, no checkout or inventory. The owner updates copy, photos, and the shelf from the admin without needing a developer for every change. It runs as Astro SSR on Workers Free, with photos on R2 and a long edge cache invalidated on save. Auth and ops were tuned to the Free plan CPU and quota limits, prioritizing zero cost and simple maintenance.
- Astro
- Cloudflare Workers
- D1
- R2
- React
- Tailwind CSS
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Multi-tenant recruiting platform: from careers site to auditable pipeline
Lab for a multi-tenant ATS in TypeScript to practice an end-to-end recruiting domain. Companies run in logical isolation per tenant, and the candidate keeps a single profile across applications. The focus is state machines, a per-job pipeline with auditing, and defense in depth for data access with Prisma over PostgreSQL. NestJS API, Next.js product, pre-signed uploads, and a public careers site in the same design.
- TypeScript
- NestJS
- Next.js
- Prisma
- PostgreSQL
- TanStack Query
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Full stack ecommerce: Hono API, Astro storefront, and order domain
Full stack ecommerce lab in a monorepo to practice API, storefront, and order domain together. REST API in Hono (Bun), SSR storefront in Astro, and persistence in PostgreSQL with Prisma and Redis. The core covers JWT session in cookies with refresh, atomic orders with stock, CEP-based shipping, and an OpenAPI contract with Zod. The storefront already creates real orders; payment is still simulated in the presentation layer.
- TypeScript
- Hono
- Astro
- PostgreSQL
- Redis
- Prisma
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Corporate chat with local RAG: indexed policies without going to the cloud
Lab for a local RAG chatbot to query policies and runbooks without sending the corpus to external APIs. Stack on Bun, Hono, React, Ollama, and Chroma, with embeddings and generation kept in the local environment. Retrieval is hybrid: vector search with lexical rerank and fallback when similarity is weak. NDJSON streaming with cancellation, and history off by default so it does not pollute the embed on small models.
- Bun
- Hono
- React
- Ollama
- ChromaDB
- LangChain
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Mock API for prototyping UIs: CSV into SQLite, filters, and OpenAPI contracts
Lab for a public mock API with ready-made datasets (products, postal codes, movies, and more) to prototype frontends without a real backend. The core is Hono on Bun with a SQLite cache fed by files under data/. It has SQL filters, search and sort, typed OpenAPI, fake mutations, and mock auth. Reimport runs only at boot when the manifest changes, with no runtime watch.
- Bun
- Hono
- SQLite
- Zod
- OpenAPI
- Docker
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Projects

Grocery storefront with WhatsApp CTA on Cloudflare Workers Free

Multi-tenant recruiting platform: from careers site to auditable pipeline

Full stack ecommerce: Hono API, Astro storefront, and order domain

Corporate chat with local RAG: indexed policies without going to the cloud

Mock API for prototyping UIs: CSV into SQLite, filters, and OpenAPI contracts