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Full-stack Web Engineer with 3+ years of experience building and scaling production web platforms. I lead the development of SISU Fitness Club, a React + Node.js + MongoDB platform for coaches and athletes, delivering service for over 30 athletes, improvement in web performance, and a unified platform foundation. Strong focus on secure architectures (CORS/CSP/HSTS), reliability (health checks, background schedulers), and developer productivity.…Full-stack Web Engineer with 3+ years of experience building and scaling production web platforms. I lead the development of SISU Fitness Club, a React + Node.js + MongoDB platform for coaches and athletes, delivering service for over 30 athletes, improvement in web performance, and a unified platform foundation. Strong focus on secure architectures (CORS/CSP/HSTS), reliability (health checks, background schedulers), and developer productivity.

Juan Beltran

AI Developer, Content Designer, Digital Marketer, +2

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Full-stack Web Engineer with 3+ years of experience building and scaling production web platforms. I lead the development of SISU Fitness Club, a React + Node.js + MongoDB platform for coaches and athletes, delivering service for over 30 athletes, improvement in web performance, and a unified platform foundation. Strong focus on secure architectures (CORS/CSP/HSTS), reliability (health checks, background schedulers), and developer productivity.…Full-stack Web Engineer with 3+ years of experience building and scaling production web platforms. I lead the development of SISU Fitness Club, a React + Node.js + MongoDB platform for coaches and athletes, delivering service for over 30 athletes, improvement in web performance, and a unified platform foundation. Strong focus on secure architectures (CORS/CSP/HSTS), reliability (health checks, background schedulers), and developer productivity.

Available to hire

Full-stack Web Engineer with 3+ years of experience building and scaling production web platforms. I lead the
development of SISU Fitness Club, a React + Node.js + MongoDB platform for coaches and athletes, delivering service
for over 30 athletes, improvement in web performance, and a unified platform foundation. Strong focus on secure
architectures (CORS/CSP/HSTS), reliability (health checks, background schedulers), and developer productivity.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Spanish; Castilian

Fluent

English

Fluent

Swedish

Beginner

Work Experience

Lead Software Engineer (Full-Stack) at SISU Fitness Club (Platform)

September 1, 2025 - October 13, 2025

Delivered a coaching/athlete platform enabling personalized routines, progress tracking, scheduling, and membership management. Improved product delivery speed by 40% using Cursor agents and GitHub; boosted web performance by 25% through unified architecture, modular boundaries, code splitting, and asset optimization. Implemented a secure API gateway with environment-aware policies (CORS allow list, CSP/HSTS), request sanitization, and rate limiting. Automated membership tracking, billing cycles, and notifications with resilient background jobs. Designed scalable domain models for fitness workflows and integrated external services (Cloudinary, OpenAI, Google and Spotify OAuth). Deployed API and SPA as separate services on Render with fallback routing and domain redirects.

Customer Service Representative at IntouchCX

August 1, 2025 - October 13, 2025

Resolved travel-related issues for global clients on calls, emails, and messaging, ensuring 100% of clients received a solution and over 70% reported satisfaction. Provided shadowing opportunities and Q&A sessions for over 50 colleagues to improve performance. Recognized as a top-performing agent and participated in company-wide town halls for excellence.

Content Creator at Noticias IA Colombia

April 1, 2025 - October 13, 2025

Regulated content for Noticias IA Colombia, the country’s first AI-focused newspaper. Used IA agents, ChatGPT, Perplexity, Flux, WordPress, Ideogram and Canvas to produce/editorial content.

Lead Software Engineer (Full-Stack) at SISU Fitness Club (Platform)

September 1, 2025 - October 13, 2025

Led the development of SISU Fitness Club, a coaching/athlete platform enabling personalized routines, progress tracking, scheduling, and membership management. Improved product delivery speed by 40% using Cursor agents and GitHub; boosted web performance by 25% through unified architecture, modular boundaries, code splitting, and asset optimization. Implemented a secure API gateway with environment-aware policies, CORS allow lists, CSP/HSTS, request sanitization, and rate limiting. Automated membership tracking, billing cycles, and notifications with resilient background jobs. Designed scalable domain models for fitness workflows and integrated external services (Cloudinary, OpenAI, Google and Spotify OAuth). Deployed API and SPA as separate services on Render with fallback routing and domain redirects.

Customer Service Representative at IntouchCX

August 1, 2025 - October 13, 2025

Resolved travel-related issues for global clients on calls, emails, and messaging, ensuring 100% issue resolution with over 70% customer satisfaction. Provided shadowing opportunities and Q&A sessions for over 50 colleagues to improve performance. Recognized as a top-performing agent and participated in company town hall.

Content Creator at Noticias IA Colombia

April 1, 2025 - October 13, 2025

Regulated content for Noticias IA Colombia, the country’s first newspaper focused entirely on artificial intelligence (AI); collaborated with IA agents, ChatGPT, Perplexity, Flux, WordPress, Ideogram and Canvas to manage AI-driven content workflows.