Efrain Grand

Desarrollador Web y software

Oct 2025 - Present • 10 mos

I developed several landing pages for local businesses, featuring WhatsApp contact buttons, links to their social media accounts, an overview of their services, business hours, a map of their physical location, a visitor counter, and an attractive design. The businesses I offered my services to include: physical therapists, dentists, nutritionists, and clinical psychologists.

Astroquest Web app

May 2025 - Feb 2026 • 9 mos

Project Title in Your Portfolio: Full-Stack Development and Product Ownership: Technical Astrology Web App with AI (MVP) Role Description and Responsibilities Role: Lead Full-Stack Developer / Product Owner / AI Prompt Engineer Overview: Conception, design, technical architecture, and deployment of the AstroQuest MVP, a progressive web platform focused on automating traditional astrological analyses and gamifying weekly tasks, optimized for user conversion and retention without an advertising budget. 🛠️ Technical Stack and Architecture Frontend & Architecture: Developed with Next.js 14 (React) and Tailwind CSS, ensuring optimal load times, efficient rendering (server-side rendering for API security), and a responsive interface with a premium dark theme. Physical/Astronomical Calculation Engine: Integration of the astronomy-engine library for the exact, real-time calculation of celestial positions and natal data. Advanced Artificial Intelligence Integration: Implementation and use of the Claude 4 Sonnet API through a secure server-side proxy. Design of an advanced prompt system with a 7-step internal Chain-of-Thought reasoning process to enforce strict outputs in JSON format, ensuring the engine’s logical and doctrinal accuracy. Efficient Data Persistence (Free Tier): Data architecture based on localStorage to store the user’s mission history and the rewards system (XP), minimizing server costs during the validation phase. 🧠 Product, Business, and Gamification Achievements Complex Business Logic: Programming an algorithm with immutable doctrinal rules (planetary sects, Whole Sign Houses, and lords of the year by profection). Comprehensive Gamification System: Design and implementation of a user retention system based on experience points (XP) and strategic usage limits (rate limit of 1 mission per week) to increase the perceived value of the product.