Sean
Lozana.
Full-stack Engineer.
Building elegant cloud-native architectures and high-performance cross-platform applications.
*Why devzana? It originated as my gaming IGN and naturally evolved into my software development branding.
Experience.
Freelance Full-stack Engineer
Architected cloud-native, cross-platform applications and AI ecosystems. Built an SSI/SSA Case Status App using Nuxt, Salesforce, and GCP, and an AI-Doc-Parser System with RAG and HITL workflows. Collaborated on a Federal Proposal Writing Assistant Software leveraging Next.js and Supabase.
Software Engineer (Full-stack)
Developed features for an internal HRIS portal using NodeJS and ReactJS. Created an event/office booking management app using Flutter, NextJS, Strapi, and Supabase. Applied Agile methodologies working with cross-functional teams.
React Native Developer Intern
Spearheaded the development of an e-Wallet Mobile Application using React Native. Implemented screens according to design specifications and integrated backend APIs.
NextJS Developer Intern
Upgraded the Internal Admin Dashboard by implementing pages and components based on design specifications.
Selected Projects.
A collection of robust web applications, data systems, and generative AI integrations.
AI-Doc-Parser System
Automated document parsing ecosystem using high-accuracy OCR integrated with a Google Cloud backend. Designed Human-in-the-Loop workflows and custom RAG loops that systematically self-correct and improve precision models.
Predictive Options Trading Application
Advanced trading feature modules utilizing Next.js and Python with complex third-party data APIs. Configured end-to-end test automation and provided data-driven probability estimates for high-frequency trades.
Cross-Platform SSI/SSA Case Status App
Cloud-native, cross-platform app assisting elderly users with SSI/SSA case tracking. Features an integrated Salesforce backend, Twilio built-in VoIP, and an embedded generative AI chat interface.
Federal Proposal Writing Assistant
Enterprise federal contract proposal authoring application mirroring a high-performance digital word processor. Engineered prompt injection utilities to intelligently surface contextual keyword recommendations.
All-in-One Property Management Tool
Unified OTA platforms like Airbnb and Booking.com for streamlined content management. Architected the backend utilizing Nest.JS and MongoDB, with a high-fidelity Next.js frontend.
Skills.
A comprehensive toolkit for building scalable, high-performance applications.
Languages
Frameworks & Libraries
Cloud & Infrastructure
Tools
Beyond Code
Competitive Programming / Software Architecture / Badminton / Music / FPS Gaming