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I'm a senior MERN Stack Engineer passionate about embedding AI/ML into production products. I build scalable full-stack apps and lead AI integration across healthcare, manufacturing, e-commerce, and SaaS, delivering measurable business impact through end-to-end solutions and robust cloud deployments. I mentor teammates, champion best practices, and enjoy turning complex requirements into practical, reliable features—from wiring LLM APIs to serving Python inference services and surfacing predictions in React UIs. I thrive in cross-functional teams and love shipping features that users actually feel.…I'm a senior MERN Stack Engineer passionate about embedding AI/ML into production products. I build scalable full-stack apps and lead AI integration across healthcare, manufacturing, e-commerce, and SaaS, delivering measurable business impact through end-to-end solutions and robust cloud deployments. I mentor teammates, champion best practices, and enjoy turning complex requirements into practical, reliable features—from wiring LLM APIs to serving Python inference services and surfacing predictions in React UIs. I thrive in cross-functional teams and love shipping features that users actually feel.

Johann De La Cruz

Full Stack Developer, Front-End Developer, DevOps Developer

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I'm a senior MERN Stack Engineer passionate about embedding AI/ML into production products. I build scalable full-stack apps and lead AI integration across healthcare, manufacturing, e-commerce, and SaaS, delivering measurable business impact through end-to-end solutions and robust cloud deployments. I mentor teammates, champion best practices, and enjoy turning complex requirements into practical, reliable features—from wiring LLM APIs to serving Python inference services and surfacing predictions in React UIs. I thrive in cross-functional teams and love shipping features that users actually feel.…I'm a senior MERN Stack Engineer passionate about embedding AI/ML into production products. I build scalable full-stack apps and lead AI integration across healthcare, manufacturing, e-commerce, and SaaS, delivering measurable business impact through end-to-end solutions and robust cloud deployments. I mentor teammates, champion best practices, and enjoy turning complex requirements into practical, reliable features—from wiring LLM APIs to serving Python inference services and surfacing predictions in React UIs. I thrive in cross-functional teams and love shipping features that users actually feel.

Available to hire

I’m a senior MERN Stack Engineer passionate about embedding AI/ML into production products. I build scalable full-stack apps and lead AI integration across healthcare, manufacturing, e-commerce, and SaaS, delivering measurable business impact through end-to-end solutions and robust cloud deployments.

I mentor teammates, champion best practices, and enjoy turning complex requirements into practical, reliable features—from wiring LLM APIs to serving Python inference services and surfacing predictions in React UIs. I thrive in cross-functional teams and love shipping features that users actually feel.

Skills

Experience Level

Expert

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Work Experience

Backend Developer at Altex Trade

July 1, 2024 - Present

Led end-to-end ownership of inventory and HRM modules on a healthcare manufacturing platform, architecting the React UI, designing 14 MongoDB collections, and building 40+ Node.js/Express endpoints. Served as AI integration lead, embedding predictive and generative AI features across the production MERN stack. Diagnosed load-time issues on top-visited views, rewrote 11 MongoDB aggregations with compound indexes, and introduced Redis caching, cutting average page-load time by 52%. Designed and shipped an AI-powered demand-forecasting feature (PyTorch time-series model) served via a Python REST microservice, integrated into the Node.js API, surfacing 7-day stock predictions in a React dashboard, and delivering a 40% reduction in stockouts for high-value SKUs in the first quarter. Implemented a unified auth layer with JWT and 5 RBAC roles across 23 endpoints, aiding HIPAA audit with zero findings. Built a zero-downtime CI/CD pipeline with GitHub Actions and AWS ECS, reducing deployment ti

Full-Stack Web Developer at Crossnetics

March 1, 2024 - August 1, 2025

Core engineer on a 12-person squad delivering a multi-tenant SaaS analytics platform. Owned React/Next.js frontend and NestJS/Node.js backend, implementing subscription billing, licensing, and a real-time WebSocket activity feed. Optimized a 500k+ record admin dashboard by rewriting 6 aggregation stages with $facet/$lookup and adding Redis caching, reducing P95 query time from 8.3s to 0.9s and eliminating the top support ticket for three sprints. Led end-to-end AI integration for churn prediction: fine-tuned a TensorFlow classifier on 18 months of user data, served via a Python inference service, streamed live events to the model, and displayed real-time churn risk scores, cutting at-risk response time by 60% and contributing to a 15% quarterly retention lift. Refactored a monolithic background job runner into a RabbitMQ-based event bus with four NestJS consumers, eliminating timeout spikes and lowering latency by 70%. Containerized eight microservices with Docker and Kubernetes on AWS

Senior Software Engineer at OsofTec

June 1, 2016 - April 1, 2020

Led full-stack development of a custom ERP for a 200-employee manufacturing client. Designed MongoDB schema across 9 core collections, built 30+ Node.js/Express API endpoints, and delivered a React frontend covering inventory, order management, and production scheduling. Enabled onboarding in under two weeks. Resolved a 6-month performance escalation by profiling MySQL queries, adding 8 composite indexes, migrating catalog to MongoDB, and introducing Redis caching on 12 endpoints, reducing checkout load time by 55%. Led AI integration for real-time fraud detection: trained a TensorFlow gradient-boosting model on 2 years of data, deployed via a Python REST inference service, and integrated with the checkout pipeline to surface risk scores with SHAP explanations, cutting manual review time by 35% and reducing chargebacks by 20%. Delivered a telecom client self-service portal in under 10 weeks with a 6-module React SPA and Node.js/Express backend, integrating 4 legacy APIs and implementin

Software Engineer at Locaweb

April 1, 2015 - June 1, 2016

Drove progressive modernization of a 6-year-old PHP monolith: migrated 4 core modules to a modern MERN stack across 14 months, delivering zero downtime for 10,000+ active users. Built an internal CRM from scratch in 3 months (React frontend with drag-and-drop views, Node.js/Express REST API, MongoDB, WebSocket activity feed) replacing spreadsheet workflows and saving 45+ hours weekly. Delivered the company’s first AI feature—a lead-scoring model trained on 18 months of CRM data (12,000+ leads), deployed as a REST inference service and surfaced as a sortable column, achieving a 25% lift in lead-to-call conversion in week 1 and 18% revenue-per-rep improvement over the following quarter. Integrated early OpenAI GPT-3.5 capability to auto-generate personalized outreach email drafts from lead data, significantly reducing manual drafting time. Led the MySQL-to-MongoDB migration with Python scripts and automated reconciliation checks, cutting downtime to under 30 minutes.