Senior Full-Stack Engineer

Hel Rabelo

9+ years building scalable products across fintech, e-commerce, and SaaS.From pixel-perfect UIs to system architecture.

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Hel Rabelo
About

Frontend expert, full-stack practitioner

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

With 9 years focused on React, Next.js, TypeScript, and modern frontend, I'm expanding into full-stack development and system architecture. I bring deep expertise in PostgreSQL, GraphQL, Node.js, and AWS services, with proven ability to architect end-to-end solutions from database design to pixel-perfect UIs.

Key achievements: Increased organic traffic by 150% (200K to 500K visitors), cut frontend development time by 40% through design systems, and reduced hosting costs by 43% via performance optimization.

Currently

  • Senior Frontend Engineer at Planetary — delivering solutions for Din Tai Fung, Burlington, and 177 Milk Street
  • Building indie products at Helsky Labs — shipping apps like DropVox and Days as Numbers
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
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

Full-stack capabilities from database to deployment. Proven in high-traffic production environments.

Expert

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

Production Experience

Shipped to production
React NativeGraphQLApollo ClientRuby on RailsPythonStripeSvelteGSAPFramer MotionThree.jsJestCypressAWS (Amplify, S3, Lambda)SupabaseAlgoliaDocker

Exploring

Building expertise
GoKubernetesSystem DesignEvent-Driven Architecture

Practices and Methodologies

SOLID principles, Clean Architecture, DRY, Test-Driven Development, Agile (Scrum/Kanban), Code Review, Pair Programming, Performance Optimization, Accessibility (WCAG), CI/CD Pipelines, Technical Documentation

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

Gitography

Transform your GitHub contribution history into beautiful art. Visualize your coding journey as unique patterns and share your developer story.

Live

Days as Numbers

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

Days as Numbers preview
Coming Soon

Bespoke CV

AI-powered resume tailoring that customizes your CV for each job application, highlighting relevant skills and experience.

Concept

Spotify Galaxy

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

Concept

Code Particles

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

More experiments on GitHub

Contact

Get in Touch

Have a project in mind or want to collaborate? I'd love to hear from you.

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