Christian Elías Cruz González

Ubidots · Medellín, Colombia (Remote)

• –Led architecture and performance of an IoT SaaS platform with 150K+ active users and real-time data via WebSockets.
• –Reduced dashboard load times from 8s to 5s (-37%) and optimized ECharts widget rendering from 30s to under 15s (-50%) through virtualization, memoization, and canvas rendering.
• –Cut release cycle from 50 to 20 min (-60%), reducing delivery friction for a team of 20+ developers.
• –Established quality standards, an internal ESLint plugin, and code review guidelines adopted by the whole team; mentored 2 junior engineers through pair programming and structured reviews.

Stack: React, TypeScript, ECharts, TanStack Query, WebSockets, Node.js, Python (Django), ESLint (custom plugin), Jest, GitHub Actions.

Ubidots · Medellín, Colombia (Remote)

• –Implemented payments module with Stripe and migrated the fetching system to TanStack Query, eliminating duplicated state and enabling direct freemium-to-paid conversion.
• –Built and maintained the mobile app (iOS + Android) in React Native, shipping new platform features directly to end users.
• –Contributed to the design and implementation of key components of the real-time IoT dashboard system.

Stack: React, TypeScript, React Native, TanStack Query, Stripe, WebSockets, Node.js, Python (Django), Jest.

Clever Cloud · Mexico (Remote)

• –Developed and integrated sites (e-commerce, landing pages, blogs) on the company's proprietary CMS, owning the full cycle: requirements gathering with clients, translating to technical specs for a team of 5 devs, implementation, and delivery.
• –Designed and implemented a pixel-perfect landing page from a graphic designer's mockups, coordinating deliveries directly with the client through final approval.
• –Defined CI/CD flows and the dev–staging–production pipeline, adopted as the team standard.

Stack: React, Vue, PHP, MySQL, GitHub Actions, CI/CD.