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Julio César Díaz

Front-End Developer

I build fast, accessible products end to end — React & Next.js frontends, Python & Node backends, AI built in.

Based in West Palm Beach, Florida

About Me

I'm a developer who takes products from an empty repo to production — and owns every layer in between. Over 5+ years I've shipped business-intelligence dashboards, AI-powered platforms, booking systems, and cloud-infrastructure tools, usually building the frontend from zero while contributing across the backend.

My core is the frontend — scalable architectures in React, Next.js, TypeScript, and Tailwind, built on clean-code principles a team can extend without fear. But I'm just as comfortable behind the API: REST backends with FastAPI and Node, Postgres schemas with row-level security on Supabase, secure auth, and Docker deploys on GCP and AWS. Shipping end to end means fewer handoffs and faster iteration — and it shows in the numbers: a 100/100 Lighthouse score, 95% test coverage, sub-2s loads.

I also build with LLMs day to day — Claude, MCP, and custom tooling — to ship features faster and smarter. I move fast without cutting corners, communicate clearly, and love partnering with designers and engineers on hard problems. If you're building something ambitious, I'd love to help.

Here are a few technologies I've been working with recently:

  • React
  • Next.js
  • TypeScript
  • Tailwind CSS
  • Node.js
  • FastAPI
  • Python
  • Supabase
  • PostgreSQL
  • Docker
  • Claude / MCP

Where I've Worked

  • 2025 - Present

    Main Frontend Developer · ConsumrBuzz

    Hybrid · Lake Worth Beach, Florida

    Built ConsumrBuzz SaaS end to end — owning the entire frontend and contributing across the backend — a full-stack business intelligence dashboard for business listing management, automated publisher scanning, and analytics reporting.

    View details
    • Lead all frontend architecture decisions and establish development standards
    • Design and implement scalable React application with strict TypeScript patterns
    • Build comprehensive entity management system for publishers, SMBs, and agencies
    • Implement automated scraping job monitoring and analytics dashboards
    • Integrate authentication, bulk upload, billing, and document management modules
    • Build backend REST APIs with FastAPI and a secure data-access layer
    • Containerize services with Docker and manage deployments on Google Cloud Platform (GCP)
    • Integrate the Google Business Profile API for business listing synchronization
    • Delivered production-ready business intelligence platform from concept to deployment
    • Established a strict three-layer architecture pattern ensuring security and maintainability
    • Built a modular dashboard supporting multiple user roles with dynamic navigation
    • Delivered the full-stack platform end to end — Next.js frontend, FastAPI backend, and GCP deployment
    • Next.js
    • React
    • TypeScript
    • Tailwind CSS
    • shadcn/ui
    • Kinde Auth
    • next-intl
    • TanStack Query
    • React Hook Form
    • Zod
    • FastAPI
    • Python
    • Docker
    • GCP
    • Google Business Profile API
  • 2024 - 2025

    Front End Developer · Second Window

    Remote · Alicante, Spain

    Led frontend development for AI-powered educational platforms and a multi-cloud infrastructure visualization tool, delivering two production applications end-to-end.

    View details
    • Own frontend architecture decisions, tech stack selection, and code quality standards
    • Design and build interactive React applications with TypeScript, Zustand state management, and modern tooling
    • Integrate enterprise third-party services including Azure AD, Stripe, and multi-cloud provider APIs
    • Implement comprehensive testing strategies with Jest and React Testing Library achieving high coverage
    • Collaborate with backend engineers on REST API contracts and data integration patterns
    • Delivered a visual cloud architecture designer enabling non-technical users to design and deploy infrastructure
    • Built real-time multi-cloud cost calculator reducing client infrastructure planning time significantly
    • Established reusable component library and development standards that improved team velocity by 40%
    • React
    • Next.js
    • TypeScript
    • Tailwind CSS
    • Zustand
    • XYFlow
    • Azure AD
    • Stripe API
    • Jest
  • 2024 - 2024

    Web Developer · Freelancer

    Remote · Alacant, Spain

    Designed and built a full-featured sports betting platform from scratch with real-time odds, live data feeds, and secure user authentication deployed on AWS.

    View details
    • Architect and develop the entire React-based betting platform independently from concept to production
    • Design and implement secure authentication flows with AWS Cognito including user pools and identity management
    • Build responsive, accessible UI components with Tailwind CSS and shadcn/ui component library
    • Integrate third-party sports data APIs for real-time odds and live match tracking
    • Establish testing strategies, CI/CD pipelines, and code quality standards
    • Delivered production-ready betting platform within a 6-month timeline as a solo developer
    • Built a modular, scalable architecture enabling rapid feature additions post-launch
    • Optimized Core Web Vitals achieving sub-2s LCP and 90+ Lighthouse performance scores
    • React
    • TypeScript
    • Tailwind CSS
    • AWS Amplify
    • AWS Cognito
    • Jest
    • Shadcn
  • 2023 - 2024

    Web Developer / IT Specialist · Legacy BHC

    On-site · West Palm Beach, United States

    Built enterprise internal tools for a behavioral healthcare company, digitalizing employee certification tracking, vacation management, and HR workflows.

    View details
    • Develop and maintain internal web applications for certification tracking, vacation scheduling, and employee onboarding
    • Implement pixel-perfect responsive interfaces from detailed Figma design specifications
    • Build reusable component library and establish frontend code quality standards
    • Manage AWS deployments, CI/CD pipelines, and application infrastructure
    • Administer IT systems including Active Directory, Office 365, and network infrastructure
    • Digitalized employee certification tracking, eliminating manual processes and reducing administrative overhead by 60%
    • Delivered a complete HR management platform serving 200+ employees across multiple facilities
    • Maintained 99.9% uptime across all managed applications and IT infrastructure
    • Next.js
    • TypeScript
    • Tailwind CSS
    • MongoDB
    • AWS
    • Jest
    • Figma
  • 2019 - 2021

    Web Developer & IT Specialist · ETECSA

    On-site · Santa Clara, Cuba

    Developed internal web applications for Cuba's national telecommunications company, building management systems that streamlined regional operations for thousands of users.

    View details
    • Design and develop internal web applications for telecommunications operations and HR management
    • Build responsive, accessible UI components with React and Tailwind CSS
    • Integrate frontend applications with Django REST API backends and legacy systems
    • Maintain and modernize existing codebases while ensuring zero-downtime operations
    • Collaborate in code reviews, technical planning, and cross-team coordination
    • Delivered telecommunications management platform serving 10,000+ daily users across regional offices
    • Automated employee feedback workflows reducing collection and processing time by 50%
    • Maintained zero-downtime record across all production deployments
    • React
    • JavaScript
    • Tailwind CSS
    • Django
    • MongoDB
    • Jest
    • Git

Some Things I've Built

ConsumrBuzz SaaS - Business Intelligence Dashboard preview

ConsumrBuzz SaaS - Business Intelligence Dashboard

@ ConsumrBuzz

Full-stack SaaS platform for business listing management with automated publisher scanning, analytics, and multi-tenant role-based dashboards, powered by a FastAPI backend deployed on GCP.

  • Next.js
  • React
  • TypeScript
  • FastAPI
  • Python
  • Docker
  • GCP
  • Google Business Profile
  • TanStack Query
BookEasely preview

BookEasely

@ Personal

Cross-platform appointment-booking SaaS for small and medium businesses. Clients discover businesses, browse services, pick a worker, and book online, while owners manage their profile, services, staff, and schedule from both web and mobile.

  • Next.js
  • React
  • TypeScript
  • Expo
  • React Native
  • Supabase
  • Twilio
  • Tailwind CSS
  • shadcn/ui
ReviewBoost preview

ReviewBoost

@ Personal

Review-management platform for local businesses — collect more Google reviews through QR codes and trackable request links, reply with AI-assisted responses, and monitor reputation from a single dashboard across web and mobile.

  • Next.js
  • React
  • TypeScript
  • Expo
  • React Native
  • Supabase
  • Google Business Profile API
  • OpenAI
  • Tailwind CSS
  • shadcn/ui
Turing Dream preview

Turing Dream

@ Second Window

AI-powered educational services platform built as two production web apps — a public-facing product and an internal admin panel — with multi-role access and subscription billing.

  • React
  • TypeScript
  • Tailwind CSS
  • shadcn/ui
  • Zustand
  • React Router
  • Azure AD
  • Stripe
  • React Testing Library

Other Noteworthy Projects

  • Cloud Infrastructure Designer

    Interactive visual tool for designing, estimating costs, and deploying cloud architectures across AWS, Azure, and GCP.

    • React
    • TypeScript
    • XYFlow
    • Zustand
    Active
  • BetHomeWeb

    Full-featured sports betting platform with real-time odds, live match tracking, and secure user authentication.

    • React
    • TypeScript
    • Tailwind CSS
    • AWS Cognito
    Active
  • Employee Management Suite

    Enterprise HR platform for certification tracking, vacation scheduling, and employee onboarding across multiple healthcare facilities.

    • Next.js
    • TypeScript
    • MongoDB
    • Tailwind CSS
    Archived
  • Telecommunications Management System

    Internal platform for managing phone line transfers and employee evaluations for Cuba's national telecom provider.

    • React
    • JavaScript
    • Django
    • MongoDB
    Archived

Skills & Technologies

Expert

  • React
  • Next.js
  • Tailwind
  • JavaScript
  • TypeScript

Proficient

  • Jest
  • GraphQL
  • Redux
  • HTML
  • CSS
  • Git
  • GitHub
  • Docker
  • MariaDB
  • MongoDB
  • Django

Education & Certifications

Software Engineering Certificate

UCLV

2021

Get In Touch

I'm currently open to new opportunities and interesting projects. Whether you have a question, a role to fill, or just want to say hi, my inbox is always open — I'll do my best to get back to you.

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