I need a lightweight crypto exchange that lets users register, fund an account, and swap coins instantly at live market rates pulled from a public pricing API. The first release only has to cover the essentials: deposits, withdrawals, balance display, and a straightforward swap screen rather than a full order book. Security is critical, so the code must be clean, audited-ready, and structured so that email verification and optional two-factor authentication can be dropped in without a redesign. I will confirm the exact list of supported currencies (very likely Bitcoin, Ethereum, and Litecoin) once the framework is in place, so please keep asset support modular. Tech stack is your call—Node.js, Python, or Go are all fine as long as you supply install scripts, clear environment variables, and a concise README. Containerised deployment (Docker or similar) is preferred so I can spin up staging and production instances quickly. Deliverables: • Complete source code with inline comments • Deployment script or Dockerfile • Minimal SQL (or NoSQL) schema scripts • A brief PDF or Markdown guide explaining setup, configuration, and how to add new coins • One walkthrough call to hand over the system and answer questions Keep the UX clean and uncluttered, focus on reliability, and feel free to suggest small improvements that keep the scope “simple” while future-proofing the platform.