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An interactive learning guide for developers aiming to reach senior level with a frontend focus. Spanning 10 structured phases, it covers everything from JavaScript engine internals, TypeScript's advanced type system, and modern CSS layout — through React architecture, Next.js App Router, Node.js, databases, and real-time systems — all the way to testing strategies, security, observability, AI integration, and technical marketing.
App Router, strict TypeScript, ESLint + Prettier, a testing layer (Vitest/Jest + Playwright), and a clear separation between UI, domain logic, and infrastructure — the kind of structure a principal engineer would set up to keep the codebase scalable past the first few features.
Here's your family reading board — a bookshelf where each kid gets a colored spine. Tap a spine to open their page: log today's reading with an optional note, watch a little amber bookmark ribbon grow out the top with their streak, and see a 14-day heatmap plus their recent log. Hitting 3, 7, 14, 30+ days pops a small celebration message.
Built it as a live ledger-style calculator: enter CAC, monthly revenue per customer, and gross margin, and it computes the payback period in months with a color-coded "runway" bar (efficient / average / slow zones) plus the formula spelled out underneath.
