Hi, I'm

Rowan
Hall

CrossList

Multi-platform resale automation tool. Manage inventory and publish listings across Facebook Marketplace, Grailed, eBay, Depop, and Shopify. Reverse-engineered GraphQL/REST APIs for cross-listing, built a Chrome extension for auth token capture, and automated delisting via Stripe webhooks to prevent double sales.

Next.js 14 TypeScript Supabase PostgreSQL
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CrossList project

LinguaLearn

AI-powered Chinese language learning web app. Fine-tuned a Qwen 2.5 7B LLM using QLoRA on a custom synthetic dataset for JSON grammar corrections, deployed on RunPod serverless GPUs. Features conversation persistence, structured feedback, and containerized multi-service architecture.

FastAPI MongoDB Docker Hugging Face PyTorch
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E-Commerce Fashion Platform

Full-stack designer fashion platform with React TypeScript frontend and Flask Python backend. PostgreSQL product storage, S3 media hosting via presigned URLs, and serverless deployment with Docker and AWS Lambda.

React TypeScript Flask PostgreSQL AWS
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E-Commerce platform project

Morse Code LED Signal Processor

Text-to-Morse code conversion system built with Assembly and Arduino. Real-time LED transmission protocols demonstrating low-level hardware control and embedded systems design.

Assembly Arduino Embedded
Source Code
Morse Code LED project
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