Founder & CEO
CapySchool | Oct 2024 – Present | Chile
AI-powered multilingual EdTech platform for language learning and pronunciation practice.
- Built +120 blog articles by integrating AI-powered content API
- Achieved a perfect 100 Lighthouse Core Web Vitals score by optimizing SSR/SSG and asset delivery
- Implemented a multilingual UI and SEO metadata across 40+ locales
- Achieved #2 global ranking on Google Search for "IPA Reader" by implementing TTS and SEO optimizations
- Generated and integrated audio assets using Text-to-Speech
- Implemented the Content System using Blackboard Architecture and AI API
- Migrated the Content System to a Self-Contained Service, transforming it into a product
- Led a team of 2 full-stack engineers, defining coding standards and sprint deliverables
Backend & Infrastructure Lead
4Geeks | Oct 2020 – May 2025 | Miami, United States
Coding education platform offering both intensive bootcamps and flexible subscription-based courses.
- Implemented premium APIs with a credit system using Stripe
- Engineered a multi-tenant platform enabling concurrent academy management
- Optimized web server performance, serving +226 million requests per day
- Scaled concurrent request capacity by 3x through optimized Celery configuration
- Strengthened message processing by implementing priority queues to eliminate task loss during system failures
- Deployed and configured New Relic across multiple services to monitor infrastructure and application performance
- Guided 10 Junior Backend developers in implementing coding standards, pull-request workflows, and sprint planning
- Designed an observability framework, enabling health checks and auto-recovery for critical business processes
Frontend & UI
- Next.js
- Astro
- React
- Svelte
- Tailwind CSS
- Shaden/UI
- Framer Motion
Backend & APIs
- Hono
- FastAPI
- Django REST Framework
- Express
- Zod
- RESTful APIs
Databases & Storage
- PostgreSQL
- Redis
- Turso
- MongoDB
- GCP (Cloud Storage, BigQuery, Firestore)
Cloud & Infrastructure
- Vercel
- Heroku
- Google Cloud Platform (GCP)
- Cloudflare
- Amazon Web Services (AWS)
- Serverless
Architecture & Patterns
- Modular Monolith
- Self-Contained Systems
- Event-Driven Design
- Domain-Driven Design
- Blackboard Pattern
Tools & Methodologies
- Agile
- Scrum
- RabbitMQ
- Celery
- BullMQ
- Git
- CI/CD
Message Queueing & Event-Driven Architecture
- Redis
- RabbitMQ
- QStash
- Celery
- BullMQ
Web Rendering Strategies
- Single-Page Application
- Server-Side Rendering
- Incremental Static Regeneration
- Server Islands
- Edge Rendering
CMS AI (Proprietary)
Headless CMS with AI and automations
- Integrated AI content generation pipeline for automated article creation
- Built content moderation and validation workflows with AI-assisted quality control
Computer Engineering
Universidad Nacional Experimental Rómulo Gallegos | 2012 – 2017 | Venezuela
- Email: jdefreitaspinto@gmail.com
- Phone: +56951451665
- Location: Santiago, Chile