90 Minutes to Enterprise LLM Engineering

Your LLM demo works. Production is a different system.The gap between "it answered correctly in the demo" and "it survives real traffic, real data, and a real on-call rotation" is not one big feature. It's a few dozen small boundaries you haven't built yet — and this book is every one of them, in order.This is a field guide, not a textbook. No introduction to what a token is. No survey of model architectures. It assumes you already ship software and now need to come up to speed, fast, on what makes LLM systems reliable. You can read it in about 90 minutes, in six timed blocks plus a short assembly at the end.The one idea everything is built on: the model is a powerful, stochastic, untrusted component. Reliability is not a property of the model — it's a property of the system you build around it. Every pattern in this book hardens one of the boundaries between your code and that untrusted component.What's inside — 36 patterns across six blocks: The Mental Model — the untrusted component, the six-boundary model, designing for failure Input & Prompt — gateways, prompt assembly, context budgeting, output contracts, the injection firewall Retrieval & Knowledge — hybrid retrieval, re-ranking, grounded citations, chunking, freshness Orchestration & Control — model cascades, routing, contracted tool use, bounded agent loops, human checkpoints Reliability & Safety — timeouts and backoff, bulkheads, tenant-safe caching, fallback chains, guardrails Evaluation & Operations — eval harnesses, shadow & canary, end-to-end tracing, cost & latency budgets Every pattern follows the same scannable shape — Intent, Context, Problem, Solution, Tradeoffs, In practice, When-not-to-use, Related — so you can read any entry in under a minute and choose the right one under pressure. Every block closes with a worked example showing the patterns cooperating on one real system.Plus four appendices you'll actually keep open: a catalog of twelve anti-patterns, a production-readiness checklist, a one-line index of all 36 patterns, and a full end-to-end reference architecture you can adapt.Who it's for: engineers with real experience (roughly 10–20 years) putting LLMs into production — backend, platform, and staff-level engineers who want the decisions, not the hype.What you walk away with: a vocabulary for LLM reliability, a checklist for shipping, and the patterns to design systems where most production failures simply never happen.Third in the series. Pairs with The Enterprise LLM Problem Solver (what breaks), The LLM Debugging Playbook (how to diagnose), and 7 Days to Production-Ready LLM Systems (the week that puts it all in production).Instant download. 70 pages. Zero theory filler.

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