# As an AI Engineer. Please learn: Harness engineering, not just prompt enginee...
Canonical: https://social-archive.org/yena/lR0M1a4ASz
Original URL: https://x.com/akshay_pachaar/status/2053815461150859272
Author: Akshay 🚀
Platform: x
## Content
As an AI Engineer. Please learn: - Harness engineering, not just prompt engineering - Prompt caching vs. semantic caching tradeoffs - KV cache management at scale - Speculative decoding vs quantization - Structured output failures & fallback chains - Evals (LLM-as-judge + human evals) - Cost attribution per feature, not just per model - Agent guardrails & loop budgets - LLM observability as a first-class discipline - Model routing & graceful fallback logic - Knowing when to fine-tune vs. in-context learning