Senior Software Engineer

Hel Rabelo

Crafting products across fintech, healthtech, and SaaS for 11+ years.

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About

Building for the web since 2013

Based in Fortaleza, Brazil, I work remotely with teams across the globe, building scalable web applications and high-performance APIs.

I specialize in Ruby on Rails, Go, React, and TypeScript, with production experience across AWS and Google Cloud. Strong focus on TDD, clean architecture, and delivering measurable results.

Notable wins include reducing hosting costs by 40% through caching optimization, achieving 99.4% test pass rates, and migrating thousands of documents with zero downtime.

Currently

  • Lead Software Engineer at Planetary — overseeing projects for Din Tai Fung, Burlington, and enterprise clients
  • Building Wishare — a wishlist sharing platform with Rails 8
  • Designing architectures, managing developers, and shipping products in fast-paced environments
Work

Selected Projects

Enterprise clients, startups, and personal projects — building scalable solutions with measurable impact.

Planetary

Din Tai Fung

Led development for the renowned restaurant chain's digital platform serving 300k+ monthly visitors across the US and Canada.

  • Reduced hosting costs by 43% through ISR caching optimization
  • Increased Lighthouse score from 50 to 90+ via performance tuning
  • Built geo-redirect system for multi-region content delivery
  • Achieved 100% content integrity during i18n migration
Next.jsTypeScriptTDDYelp API
Planetary

Burlington

Architected enterprise marketing platform for one of the largest off-price retailers, serving millions of monthly users.

  • Reduced support tickets by 38% with duplicate user detection
  • Improved store discovery across 900+ retail locations
  • Increased newsletter conversion by 24% with multi-step SMS opt-in
ReactNext.jsTypeScriptAlgoliaEpsilon API

Wishare

A modern wishlist sharing platform with real-time activity feeds, social connections, and intelligent product metadata extraction.

Ruby on RailsPostgreSQLHotwireTailwindCSS
TigerData

Timescale

Built developer tools and documentation for an open-source time-series database company.

  • Improved mobile performance by 25%
  • Reduced development time by 35% with component library
ReactTypeScriptDocumentation

Real Seguro Viagem

Led frontend development for a travel insurance marketplace serving thousands of daily users.

  • Increased performance by 40% migrating React to Svelte
  • Built i18n system supporting 5+ languages
  • Reduced support tickets by 25% with self-service claims app
ReactSveltei18nREST APIs
Skills

Tech Stack

The tools I use to build scalable applications and high-performance APIs.

Proficient

Daily drivers
Ruby on RailsGoReactTypeScriptNode.jsVueNext.jsPostgreSQLREST APIsGraphQLDockerTDDCI/CDTailwind CSS

Intermediate

Production experience
AWS (S3, Lambda, EC2)Google CloudSupabaseWebSocketsActionCableSanity CMSJWT/OAuth

Learning

Exploring
KubernetesRedis

Practices & Methodologies

SOLID principles, Clean Architecture, DRY, Test-Driven Development, Agile (Scrum/Kanban), Code Review, Pair Programming

Playground

Experiments

Interactive explorations at the intersection of data, design, and code. Some live, some in progress, some just ideas.

Coming Soon

GitHub Repo Ecosystem

3D visualization of repository relationships, dependencies, and contributor networks as an interactive constellation.

Concept

Spotify Galaxy

Explore your listening history as a navigable galaxy where artists form star systems and genres create nebulae.

Live

Days as Numbers

A philosophical exploration of time, measuring life milestones and historical events in days rather than years.

Preview
Concept

Code Particles

Interactive visualization transforming source code into flowing particle systems that reveal structure and complexity.

More experiments on GitHub

Contact

Let's Build Something

Have a project in mind? Looking for a technical partner? Or just want to say hello? I'd love to hear from you.

Fortaleza, Brazil — Available for remote work worldwide
Emailhelrabelo@gmail.com
GitHub@helrabelo
LinkedIn/in/helrabelo
Send me an email