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Engineering Notes · AI Systems · Backend

AI & Backend Engineering Notes

Practical notes from building backend systems, RAG pipelines, LLM integrations, AWS workloads, and performance optimizations.

AI Systems · LLM

How Semantic Caching Can Reduce LLM API Costs

Why repeated requests become expensive, where semantic caching fits, and what to measure before deploying it.

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RAG · FastAPI

Production RAG Architecture with FastAPI

A practical architecture for document ingestion, retrieval, generation, citations, and observability.

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RAG · Evaluation

How to Improve RAG Retrieval Quality

A systematic approach to chunking, retrieval, reranking, evaluation, and failure analysis.

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Backend Engineering

FastAPI vs Flask for AI APIs

Trade-offs around async workloads, validation, performance, ecosystem fit, and deployment.

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