Senior Software Engineer

Hel Rabelo

Crafting products across fintech, e-commerce, and SaaS for 9+ years.

Scroll
Hel Rabelo
About

Building for the web since 2017

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

I specialize in React, Next.js, TypeScript, and Node.js, with hands-on experience in PostgreSQL, GraphQL, and AWS services. Proven ability to architect end-to-end solutions from database design to pixel-perfect UIs.

Notable wins include increasing organic traffic by 150% (200K to 500K visitors) for a travel insurance platform, cutting frontend development time by 40% through centralized design systems, and reducing hosting costs by 43%.

Currently

  • Senior Frontend Engineer at Planetary — delivering solutions for Din Tai Fung, Burlington, and 177 Milk Street
  • Building Wishare — a wishlist sharing platform with Rails 8
  • Architecting scalable CMS-driven platforms, optimizing performance, and shipping features that serve millions of users
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
Tiger Data

Timescale

Built developer tools and documentation platform for a time-series database company providing cloud infrastructure for PostgreSQL.

  • Cut frontend dev time by 40% with centralized React design system (15+ components)
  • Reduced CSS duplication by 60% with dynamic theming system
  • Built Algolia search indexing 500+ docs pages (30s to 3s search time)
  • Increased mobile traffic by 45% with responsive navigation (92 Lighthouse score)
ReactTypeScriptGraphQLThree.jsAlgolia

Meu Tudo

Built fintech platform for loan management and portability serving 50,000+ monthly active users.

  • Reduced loan application time by 40% (15 to 9 minutes) with React PWA
  • Cut fraud attempts by 75% with multi-factor auth and TensorFlow.js face recognition
  • Increased organic traffic by 40% with 80+ SEO-optimized Next.js landing pages
  • Achieved 99.5% platform uptime with AWS Amplify integration
ReactReact NativeNext.jsTensorFlow.jsAWS

Real Seguro Viagem

Travel insurance comparison platform serving 500,000+ annual visitors across 15+ LATAM countries.

  • Increased organic traffic by 150% (200K to 500K visitors) with Svelte SSR and SEO
  • Reduced mobile bounce rate by 35% with PWA features (95+ Lighthouse)
  • Generated 30% of leads through embeddable React widget on 20+ partner sites
  • Cut deployment time by 90% with Netlify CI/CD for 15+ country domains
SvelteReactReduxPWAi18n
Skills

Tech Stack

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

Proficient

Daily drivers
ReactNext.jsTypeScriptJavaScript (ES6+)Node.jsPostgreSQLReduxZustandTailwind CSSSCSS/SassSanity CMSREST APIsCI/CDGit

Intermediate

Production experience
React NativeGraphQLApollo ClientStripeSvelteGSAPFramer MotionThree.jsJestCypressAWS AmplifySupabaseAlgolia

Learning

Exploring
PythonRubyDockerKubernetes

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.

Live

DropVox

Free macOS menu bar app for transcribing WhatsApp voice messages and audio files using local AI. 100% private, offline, and open source.

DropVox preview
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.

Days as Numbers 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