Karelys Denis - Full-Stack Developer & UX Specialist

I turn product ideas into web applications people actually use. 10+ years of full-stack development with a product-first mindset.

About

Over 10 years and 20+ production projects in healthcare, e-commerce, legal, and cultural sectors. I build with React and Node.js for custom platforms, and WordPress for content-driven sites, always combining development with user-centered design. My approach is product-first: understand the business goal, validate with real users, and deliver software that actually solves the problem.

Location: Chile / Spain / France

Languages: Spanish (Native), English (B2), Portuguese (B1)

Available for remote work

Services

  • Frontend Development - React & Custom Hooks, Tailwind CSS & Bootstrap, Component Architecture, Responsive Design
  • UX & Data Visualization - Custom Dashboards, Interaction Flow Design, User Testing & Feedback, User-Centered Design
  • Backend Development - Node.js / Express.js, REST APIs, Authentication & Security, Real-time Data Sync
  • CMS & Platforms - WordPress (themes/plugins), Shopify & Squarespace, E-commerce Solutions, CRM Integration

Featured Projects

  • Teatro Nescafé de las Artes - Scalable cloud platform handling 80K+ concurrent users for Chile's premier cultural venue
  • BIM TeamUp - Enterprise collaboration platform for architecture professionals managing 50+ concurrent projects
  • Pilostop - Professional e-commerce platform for security bollard manufacturer with comprehensive product catalog
  • Les Fleurs - Luxury floral e-commerce platform with 35% revenue increase and 42% mobile conversion rate
  • Institut SOM VIA - Multilingual healthcare institute platform with accessibility compliance and patient information system
  • All of Pan - International bakery e-commerce platform with optimized checkout and payment processing

View all 18+ projects

Experience

  • Applications Lead & Co-founder at Applauss (2025 - Present) - Leading development of user-facing applications and interaction flows for AI-based event recommendation platform.
  • Full-Stack Developer & Project Manager at Freelance (2019 - Present) - Building web applications for 15+ clients across Spain and Latin America.
  • IT Analyst / VBA Developer at BHP Billiton (2017 - 2019) - Developed Excel/VBA automation tools that reduced reporting time by 60%.
  • Software Implementation Specialist at Corporación Venseg 18 C.A. (2015 - 2017) - Implemented corporate software and trained 50+ end users.

Tech Stack

React, Node.js, Express.js, JavaScript, Tailwind CSS, WordPress, MySQL, Azure Cloud

Contact

Email: karelys@reakagency.com

LinkedIn: linkedin.com/in/karelys-denis

GitHub: github.com/karelysdenis