Alex ChernyshAlex ChernyshAgentic behaviorist · Tel Aviv
WritingAssistant

Notes

Notes on AI systems, retrieval, and the work that starts after the demo.

Notes on retrieval, evals, observability, and the engineering that starts once the demo is the easy part.

4 posts
Mar 10, 2026
22 min read

How to Build Legal Answering Systems That Can Be Trusted

A practical blueprint for legal QA, shaped in part by work around the Agentic RAG Legal Challenge: document identity, hybrid retrieval, structured answers, page-level grounding, telemetry, and evals.

+2
Feb 24, 2026
6 min read

Which Query Transformation Techniques Actually Help RAG?

Query rewrite, decomposition, step-back prompting, HyDE, fusion, and when each one is worth the extra latency.

+2
Feb 18, 2026
5 min read

Preventing Hallucinations in LLM Systems

How to reduce hallucinations in LLM systems with better retrieval, abstention, verification, evals, and guardrails.

+2
Feb 12, 2026
5 min read

Most RAG Failures Start in the Documents

Chunking, titles, metadata, parent-child structure, reranking, and corpus QA for RAG systems.

+2