Open to opportunities

Rei Orozco

@reiorozco

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Full Stack Engineer building scalable web and AI training environments with React/Node and deterministic architecture.

Colombia

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What I'm looking for

I’m looking for a product-focused team where I can build deterministic, high-performance systems—mixing full-stack delivery with AI integrations—while owning architecture, improving observability, and shipping maintainable features end to end.

I’m a Full Stack Engineer with 5+ years of experience building scalable full-stack web and mobile applications, optimizing system performance, and architecting data-centric environments. I recently specialized in engineering deterministic sandbox applications (“Fleet Environments”) for Large Language Model (LLM) agent training and evaluation.

At Fleet AI, Inc., I built standalone, deterministic app clones and paired reactive, lightweight desktop interfaces with Svelte 5 (Svelte Runes like $state, $derived, and $effect) to bind predictable UI state directly to the database layer. I also designed a dual-database state machine (SQLite + Drizzle ORM) to enforce full data tracking with zero client-side storage, and implemented backend activity logging in Node.js and Express.js using atomic SQL transactions for 100% runtime event capture.

I bring deep expertise across the JavaScript/TypeScript ecosystem (React, Next.js, Svelte 5, Node.js) and apply clean architecture to ship production-ready products. From building an all-in-one social media SaaS with Next.js and OAuth integrations (including Google My Business), to developing a real-time logistics tracking platform with live map features and Datadog observability, I consistently focus on maintainability, performance, and strong integration patterns (including Model Context Protocol servers with structured Zod schemas).

Experience

Work history, roles, and key accomplishments

Full Stack & AI Environment Developer

Fleet AI, Inc.

Dec 2025 - Jun 2026 (6 months)

Engineered deterministic, standalone “Fleet Environments” for LLM training and autonomous agent evaluation, including reactive UI built with Svelte 5. Built a dual-database state machine (SQLite + Drizzle ORM) for complete runtime event tracking and implemented MCP servers with Zod-validated tool schemas for AI models.

SQLite Drizzle ORM Model Context Protocol (MCP)Zod Schemas Deterministic Data Modeling Atomic SQL Transactions

Frontend Web Developer

Geeks5G Marketing Agency

May 2025 - Feb 2026 (9 months)

Architected and built a multi-channel social media management SaaS frontend with Next.js, centralizing automation for content generation and trend analysis. Implemented secure OAuth integration flows, multi-tenant authentication (Next-Auth), i18n (next-intl), and Stripe payments while leading a Clean Architecture ERP migration.

Next.js OAuth Next Intl Stripe Clean Architecture Automated Content Generation Multi Tenant Authentication Third Party Integrations

Software Developer

Kranio Santiago

May 2022 - Mar 2025 (2 years 10 months)

Built an internal real-time logistics tracking platform for Blue Express with live map tracking, barcode scanning, and incident reporting. Improved performance through server-side caching, lazy loading, and code splitting while delivering full-stack experiences using Next.js, React, Node.js, and MongoDB with Datadog observability.

Next.js React MongoDB Real Time Tracking Datadog Lazy Loading

React Native Developer

Cuculi

Nov 2023 - Jun 2024 (7 months)

Developed and shipped a cross-platform iOS/Android restaurant reservation app, owning delivery from concept to store maintenance. Implemented modular UI components, optimized navigation for multi-developer collaboration, and added engagement features like real-time check splitting and social authentication.

React Native UI Components State Management Real Time Updates Social Authentication Cross Platform Mobile Development RESTful APIs Accessibility

Frontend Web Developer

Work2 Creative Agency

Jun 2021 - May 2022 (11 months)

Developed and maintained interactive, responsive, performance-optimized interfaces using semantic HTML, modern JavaScript (ES6+), and advanced CSS. Conducted debugging and usability testing to ensure cross-browser functionality and improved cross-device accessibility.

Javascript (ES6)Responsive Web Design CSS Performance Optimization Accessibility Cross Browser Testing Debugging Usability Testing

Full-Stack Teaching Assistant

Henry Buenos Aires

Jan 2022 - Apr 2022 (3 months)

Mentored student developers through an intensive 800+ hour full-stack curriculum covering JavaScript, React, Node.js, Express, and databases. Led technical code reviews, helped unblock architecture issues, and co-led daily agile standups to simulate production workflows.

JavaScript React JavaScript (Node.Js Databases Code Review Daily Standups