Juan Carlos Valencia

Delivered end-to-end web products across multiple client engagements and internal initiatives — full-stack architecture (TypeScript, React/Next.js, Node.js/NestJS, Go), microservices, REST/gRPC APIs, event-driven systems, and cloud platforms (AWS, Azure, GCP).

• Multi-tenant SaaS web-monitoring platform with AI insights — schema-per-tenant Postgres, 17 hexagonal/DDD modules, Go + Chi + gRPC services, Next.js 16 frontend, LangGraph on Amazon Bedrock, ECS Fargate Spot.
• Content management system with Google Drive integration — modular NestJS 11 REST API with RBAC, hierarchical content, dynamic forms, hybrid Postgres + Drive storage, plus a companion Expo app for iOS, Android and Web.
• Enterprise microservices platform — hexagonal services on Azure AKS with Service Bus and Kafka, a Go service on AWS Lambda, React/Vue frontends, and 80%+ coverage gates in CI.
• Microfrontend web platform — Nx microfrontends with SSR/SSG for SEO, Redis caching that cut response times 76% (30s to 7s), and production deploys on AWS.

Improved web performance and SEO, built interactive UI components, and integrated enterprise systems for a global brand.

• Optimized landing-page performance with Next.js SSR, lazy loading and code splitting; improved SEO, organic traffic and keyword rankings.
• Implemented hexagonal architecture in the frontend to support feature-based development.
• Integrated Salesforce and Drupal through a Node.js middleware deployed on Amazon EC2.
• Designed DynamoDB data models with partition keys and GSIs, with indexed pagination and batch operations.
• Rolled out improvements progressively behind feature flags, with CloudWatch dashboards and throttling alarms.

Built reusable components, tracking and accessibility for large-scale telecom landing pages.

• Developed reusable React components with island architecture — SSR for most of the page, hydrating only interactive sections.
• Implemented Google Tag Manager with custom event tracking and performant CSS/JavaScript animations.
• Improved accessibility following WCAG guidelines, working closely with designers on responsive UI.
• Built AWS Lambda functions to detect users' local ISP IP ranges via geolocation APIs.

Designed and implemented the frontend architecture for an e-commerce platform, and moved its build pipeline off Webpack.

• Defined the React + TypeScript architecture: folder structure, component patterns, linting rules and typing conventions.
• Built responsive UI with Styled Components and consistent design tokens; global state combining Redux and Context API.
• Migrated the build system from Webpack to Vite, replacing loaders/plugins with Vite-native equivalents and gaining instant transforms and fast HMR.
• Optimized SEO with React Helmet and preloaded critical assets; deployed on AWS EC2, S3, CloudFront and Lambda.

Designed the software architecture for a real-time donation platform and delivered two further production systems.

• Architected the React + Node.js + MongoDB + WebSockets stack and implemented real-time donation tracking with Socket.io.
• Built location-based features on the Google Maps API: geocoding, distance calculations and interactive map views.
• Optimized MongoDB with document schemas and indexes for high-traffic queries; structured logging and error-handling middleware.
• Deployed containerized services on GCP Cloud Run with Cloud Build CI/CD, Cloud Logging and Cloud Monitoring dashboards.
• Also delivered a pharmacy point-of-sale and inventory system and a QR-based real-time delivery tracking platform (Vue.js + Laravel + MySQL).