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Julio César Díaz

// Front-End Developer

West Palm Beach, Florida
Available for work
juliocesar97db@gmail.com • +34 695-434-378 • https://www.linkedin.com/in/julio-césar-díaz-boente-49727821b
Photo of Julio César Díaz

About

Frontend Developer with 5+ years of experience architecting and delivering production-grade web applications using React, Next.js, and TypeScript. Proven track record building complex platforms from scratch — from business intelligence dashboards to cloud infrastructure tools. Specialized in scalable frontend architectures, secure authentication patterns, and high-performance responsive interfaces.

Skills

  • React
  • Next.js
  • Tailwind
  • JavaScript
  • TypeScript
  • Jest
  • GraphQL
  • Redux
  • HTML
  • CSS
  • Git
  • GitHub GitHub
  • Docker
  • MariaDB
  • MongoDB
  • Django

Education

Universidad Central Martha Abreu de Las Villas (UCLV)

Software Engineering

Certificates

Software Engineering Certificate

UCLV

Experience

  • - Present

    Main Frontend Developer @ ConsumrBuzz

    Lake Worth Beach, Florida - Hybrid

    Built from scratch the entire frontend of Cerebro, a full-stack business intelligence dashboard for business listing management, automated publisher scanning, and analytics reporting.

    Responsibilities

    • 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

    Achievements

    • 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
    • Next.js
    • React
    • TypeScript
    • Tailwind CSS
    • shadcn/ui
    • Kinde Auth
    • next-intl
    • TanStack Query
    • React Hook Form
    • Zod
  • -

    Front End Developer @ Second Window

    Alicante, Spain - Remote

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

    Responsibilities

    • 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

    Achievements

    • 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
  • -

    Web Developer @ Freelancer

    Alacant, Spain - Remote

    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.

    Responsibilities

    • 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

    Achievements

    • 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
  • -

    Web Developer / IT Specialist @ Legacy BHC

    West Palm Beach, United States - On-site

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

    Responsibilities

    • 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

    Achievements

    • 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
  • -

    Web Developer & IT Specialist @ ETECSA

    Santa Clara, Cuba - On-site

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

    Responsibilities

    • 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

    Achievements

    • 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

Projects

Cerebro - Business Intelligence Dashboard

SaaS platform for business listing management with automated publisher scanning, analytics, and multi-tenant role-based dashboards.

  • Built the entire frontend from scratch with Next.js 15, React 19, TypeScript, and Tailwind v4
  • Three-layer secure architecture: Client → Server Actions → DAL → FastAPI backend
  • Role-based dashboards for 7 user roles across Admin, Agency, and SMB tenants
  • Full i18n support (EN/ES/FR) with Kinde Auth and automated publisher scraping workflows
Active
Cloud Infrastructure Designer

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

  • Drag-and-drop canvas built with React and XYFlow for visual cloud architecture design
  • Real-time cost estimation engine calculating pricing across three major cloud providers
  • Azure AD SSO authentication and Stripe subscription billing integration
  • Zustand-powered state management for complex multi-resource architecture graphs
Active
BetHomeWeb

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

  • React SPA with live odds updates and multi-sport category support
  • AWS Cognito authentication with MFA and automated Amplify CI/CD pipeline
  • 95% test coverage with Jest and React Testing Library
  • 90+ Lighthouse performance score with sub-2s load times
Active
Professional Portfolio

Personal portfolio and CV website built for performance, accessibility, and SEO.

  • Built with Astro achieving 100 Lighthouse performance score and fast static page loads
  • Dark/light mode toggle with multiple customizable themes
  • Fully responsive design with print-optimized CV export for PDF generation
Active
Employee Management Suite

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

  • Next.js application with MongoDB backend serving 200+ employees
  • Digitalized manual HR processes reducing administrative overhead by 60%
  • Pixel-perfect implementation from Figma designs with role-based access control
Archived
Telecommunications Management System

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

  • React frontend integrated with Django REST API backend
  • Served 10,000+ daily users across regional telecommunications offices
  • Automated manual workflows improving regional processing efficiency by 40%
Archived