Claude Code / AI-Powered Coder - Python / Full-Stack Engineer — Multi-Marketplace E-Commerce

*FULL TIME - MONDAY THROUGH FRIDAY - 40+ HOURS A WEEK OPPORTUNITY, LONG TERM, USA TIME ZONE NEW YORK TIME ZONE, MUST WORK 830 AM TO 5 PM EST - IF NOT POSSIBLE, DO NOT APPLY* REQUIREMENT: CLAUDE CODE MAX SUBSCRIPTION, WORKING USA HOURS NEW YORK TIME ZONE 830 AM TO 5 PM EST (SOMETIMES LONGER), NO EXCEPTIONS. READ JOB DESCRIPTION BELOW: We are looking for a sharp, high-velocity Senior Full-Stack Engineer who relies heavily on Claude Code CLI (Max Plan required) to take complete technical ownership of our internal e-commerce SaaS platform. We are replacing 3Dsellers with our own in-house system. You will own the full data lifecycle: pulling 5M+ SKUs from our MySQL RDS, mapping complex automotive fitment and compatibility data (titles, interchanges, HTML, specs), listing directly via approved developer APIs (eBay, Walmart, Amazon, TikTok, FB), and handling order ingestion, tracking updates, cancellations, and customer service triage. Our Tech Stack: Backend: Python 3.12, FastAPI, SQLAlchemy 2.0 (PyMySQL), APScheduler, pandas, numpy Frontend: React 18, Vite, React Router 6, Axios, Recharts, Framer Motion Database & Infra: MySQL 8.0 on AWS RDS (~26GB, 5.17M product rows, 99 tables), single Ubuntu EC2 instance, Nginx, Systemd memory cgroups Key Responsibilities: Build direct API integrations for eBay, Walmart, Amazon, TikTok, and Facebook for listing creation, inventory/price sync, order intake, tracking updates, and automated triage. Optimize heavy data jobs (like catalog syncs and vendor feeds) to run safely within our single-worker FastAPI process without triggering memory spikes or OOM crashes. Manage automotive fitment/compatibility data, ensuring interchange numbers, attributes, titles, and HTML formatting meet strict marketplace rules. Architect and execute fast, multi-file code updates using Claude Code while taking full responsibility for code stability and deployment.