VNTG OS — Custom Inventory + Resale System
A production-grade, two-sided retail platform built from zero for a real San Jose vintage consignment store, featuring an AI-powered resale pricing engine.
The problem
Black & Brown ran a real retail operation on pen and paper. Inventory lived in someone's head and a notebook, pricing was guesswork, and there was no way for customers to see what was in stock without walking through the door. The business needed to move from a fragmented manual workflow to a modern retail platform without an engineering team, a template, or an existing codebase to start from.
What I built
VNTG OS is a production-grade, two-sided web application designed, researched, and developed from zero. The customer side is a curated storefront where shoppers browse real-time inventory, check out with promo-code support, and confirm delivery or in-store pickup. The staff side is a dedicated employee portal (live behind an Employee Login) where the team manages listings, runs AI-assisted pricing, and publishes inventory to the live site. The two sides share a single centralized, real-time inventory system, so what staff list is exactly what customers see.
The standout feature is an AI-powered resale pricing engine. Instead of pricing by gut feel, staff get on-demand price estimates generated from real-time market trends and comparable sales data, surfaced to customers through a Get a Price Estimate flow for items they want to sell in.
How it was built
I built the front end in React and Tailwind CSS using Lovable, across 19 high-fidelity Figma screens, 5 complete end-to-end task flows, and a full brand style guide built to a 390px mobile-first spec. Beyond the build, I treated this as a full product engagement: I produced a formal planning report, Gane-Sarson context diagrams, a complete interactive Figma prototype, a live pitch deck, and a deployed production codebase, all delivered within a single academic semester.
Results
- Replaced 100% of manual, pen-and-paper inventory operations with a centralized real-time system serving both customer-facing commerce and staff-side management.
- Shipped a live, AI-assisted inventory and e-commerce platform for a real San Jose business.
- A weighted scoring model rated the system 405/500 across 6 cost categories, a 65% margin over the next-best alternative evaluated.
- Backed the recommendation with a full qualitative and quantitative cost-benefit analysis, including a five-year financial feasibility study validated under two independent discount-rate scenarios.
Stack & deliverables: React, Tailwind CSS, Lovable, Figma · planning report, Gane-Sarson diagrams, interactive prototype, pitch deck, deployed production codebase