Sergey Saraev

GitHub·

Backend and AI systems engineer.

I build backend and AI systems, then keep testing their assumptions until I understand how they actually behave under failure and scale.

Selected work

RAG Knowledge System

Document Q&A with hybrid retrieval, reranking, and exact-page citations.

Local-first · 57K documents · 414 tests

Lead Pipeline Reliability Platform

Lead delivery with DLQ, replay, deduplication, and a complete audit trail.

Interactive demo · Reliability backend