PinShare already lets users drop a file, grab a six-digit PIN and pull that file down on another device, but the current code is still very much a proof of concept. My immediate priority is turning the whole backend into production-ready software. Here is what needs to happen: • Harden the API with proper rate limiting, secure file validation and background cleanup jobs. • Migrate transient metadata to PostgreSQL through SQLAlchemy, add Redis for quick look-ups and throttling, and push the actual files to an S3 bucket. • Wrap the whole stack in Docker (docker-compose for local dev, single Dockerfile for CI/CD) so it can be shipped to any container host. • Deliver a clean test suite (pytest) that covers the main paths and edge cases, plus linters and type checks. You will receive a detailed, Markdown-formatted tech brief outlining current structure, endpoints and desired improvements. I’m looking for concise, idiomatic Python, clear commit history and documentation that lets another engineer spin the service up with a single command. Once we agree on the approach I’ll open the repo and we can iterate in short, reviewable PRs until the upgrade is complete and deploys cleanly.