Prompt Engineering Blog

Advanced techniques, production patterns, and real-world case studies from the frontier of LLM applications.

Chain-of-Thought in Production: Patterns That Actually Work at Scale

Zero-shot CoT fails on complex tasks. Few-shot helps but costs tokens. Structured CoT with self-consistency sampling delivers 94% recall on legal contract review — here's the exact pattern we use in production.

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Building Evaluation Frameworks That Catch Regressions Before Users Do

LLM-as-judge is noisy. Human eval doesn't scale. We combine automated metrics, synthetic test generation, and active learning loops to achieve 91% accuracy on support ticket routing with 80% less manual review.

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Prompt Injection Defense: From Theory to Production Hardening

Indirect prompt injection via RAG retrieval is the real threat. We cover instruction hierarchy, delimiter strategies, input sanitization, and audit logging patterns that pass compliance review.

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Cutting LLM Costs 50-80%: Prompt Caching, Batch Processing, and Model Routing

Token reduction isn't about shorter prompts — it's about semantic caching, prompt compression, and intelligent model routing. Real numbers from migrating 2M monthly requests.

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Persona Adoption: Beyond "Act as an Expert" — Deep Consistency Patterns

Shallow personas break under multi-turn conversation. We show deep persona construction with consistency checks, memory injection, and multi-persona orchestration for specialized domains.

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Structured Output That Parses: JSON Schema Enforcement Without the Fragility

LLMs hallucinate JSON keys. We cover constrained decoding, parser-aware prompting, fallback strategies, and production templates for code review, research synthesis, and data extraction.

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