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r4yb3l/README.md

Raybel Hernández

Senior Software Engineer · Flutter & Full-Stack (React / Next.js / NestJS / .NET Core)

Cross-platform mobile and modern web engineer with 5+ years shipping production systems across fintech, healthcare, e-commerce, and SaaS.


👋 About me

I build scalable, real-time products end-to-end — from Flutter apps to NestJS / ASP.NET Core backends and the cloud infrastructure that runs them. I started out in backend, moved into mobile and full-stack, and today I'm just as comfortable designing a data model as I am polishing a micro-interaction.

What I care about: clean architecture, systems that hold up under real load, and code the next person can actually read. I've spent a lot of my career modernizing legacy platforms — migrating Angular to React, Java Spring to .NET Core — and wiring up the parts that tend to hurt: payments, OCR, real-time sync, multi-tenant access.

If you need a hand with something, feel free to reach out. If I don't know it yet, we'll figure it out together.

A note on this profile: most of my work lives in private client repositories (GitHub & GitLab) under NDA, so the contribution graph doesn't tell the full story. What's public is the open-source tooling I build on the side — like the package below.


🚧 Currently building

  • Chrona — a multi-business SaaS for appointment & booking management (Next.js + NestJS), built to scale. (private)
  • Manitas — a Flutter marketplace connecting users with technical-service professionals, with real-time geolocation and dynamic workflows. (private)

🧩 Featured open source — hollow

pub version license

Pixel-perfect skeleton loading screens for Flutter. Most skeleton loaders drift out of sync with the real UI because you build them by hand. hollow takes a different approach: it snapshots the real RenderObject tree of your widgets (via Dart AST analysis + a CLI) and generates shimmer placeholders that match your actual layout — automatically.

// Wrap any widget — that's it.
Skeleton(
  name: 'blog-card',
  loading: isLoading,
  child: BlogCard(data: post),
)
# Then let the CLI capture the layout and generate the bones:
dart run hollow:build -d iPhone
  • 🎯 Pixel-perfect skeletons from your real render tree — no manual measurement
  • ✨ Globally synchronized shimmer animation
  • 🌗 Dark-mode support out of the box
  • 📱 Adaptive, percentage-based layouts across screen sizes
  • ⚙️ One-command CLI powered by Dart AST analysis

Dart · Flutter · CLI · Code generation


💡 What I bring

  • Full-stack ownership — mobile, web, backend, and deployment, without needing three people for one feature.
  • Legacy modernization — turning brittle, aging codebases into maintainable modern architectures.
  • Integrations that matter — payment gateways (Stripe, QuickBooks), OCR, AI/LLM data extraction, real-time sync.
  • Architecture & fundamentals — Clean Architecture, SOLID, TDD, CI/CD, design systems.

🛠️ Tech Stack

Languages Dart TypeScript JavaScript C# SQL

Mobile & Frontend Flutter React Next.js Angular

Backend NestJS Node.js .NET

Cloud & Data Firebase Google Cloud AWS Neo4j MongoDB MySQL

DevOps & Tooling Docker GitHub Actions Git GitLab


🌐 Connect

LinkedIn Portfolio Stack Overflow Email


💼 Open to senior remote roles and large-scale Dart/Flutter or modern-web projects in U.S. and European time zones.

Popular repositories Loading

  1. hollow hollow Public

    Pixel-perfect skeleton loading screens for Flutter. Wrap any widget in Skeleton — hollow snapshots the real render tree and generates an animated shimmer that matches your actual UI.

    Dart 2

  2. tokendial tokendial Public

    Native macOS and Windows dials for the usage limits of your AI coding assistants. Reads the sessions your tools already store; nothing leaves your machine.

    C# 1

  3. r4yb3l r4yb3l Public

    Config files for my GitHub profile.

  4. evershop evershop Public

    Forked from evershopcommerce/evershop

    🛍️ Typescript E-commerce Platform

    TypeScript

  5. portfolio portfolio Public

    TypeScript

  6. social-net-template social-net-template Public

    Forked from mitchkoko/moonbase-template

    Dart