Vitalii Cherepanov — ArticlesNotes on backend architecture, AI tooling, distributed systems, and engineering practice.https://vbcherepanov.com/en-ushttps://vbcherepanov.com/avatar.jpegVitalii Cherepanov — Articleshttps://vbcherepanov.comI Scaled PHP Until It Broke. Three llama.cpp Patterns Saved It.https://medium.com/@vbcherepanov/i-scaled-php-until-it-broke-three-llama-cpp-patterns-saved-it-12ddb096ab32https://medium.com/@vbcherepanov/i-scaled-php-until-it-broke-three-llama-cpp-patterns-saved-it-12ddb096ab32Six llama.cpp optimisations translated to PHP 8.4 with JIT, benchmarked from 1M to 1B records. Half the hypotheses were wrong: SplFixedArray loses on speed, mmap is 7× slower per call, match equals switch. The other half become survival tools at scale.Wed, 13 May 2026 00:00:00 GMTVitalii CherepanovBackendArchitecturevitalii@vbcherepanov.com (Vitalii Cherepanov)What 16 Parallel Claude Agents Built Around Themselves: Deconstructing Anthropic's C Compiler Experimenthttps://medium.com/@vbcherepanov/what-16-parallel-claude-agents-built-around-themselves-deconstructing-anthropics-c-compiler-f2fa6335b1cahttps://medium.com/@vbcherepanov/what-16-parallel-claude-agents-built-around-themselves-deconstructing-anthropics-c-compiler-f2fa6335b1caAnalysis of Anthropic's experiment running 16 parallel Claude instances to build a C compiler in Rust — what infrastructure had to be invented around the agents because the primitives weren't there yet.Sat, 09 May 2026 00:00:00 GMTVitalii CherepanovAI AgentsOpen Sourcevitalii@vbcherepanov.com (Vitalii Cherepanov)The right of an AI agent to stay silenthttps://medium.com/@vbcherepanov/the-right-of-an-ai-agent-to-stay-silent-db29c478e577https://medium.com/@vbcherepanov/the-right-of-an-ai-agent-to-stay-silent-db29c478e577Production AI should optimise for zero confidently-wrong actions, not accuracy percentage. Abstain as a first-class outcome, self-tasking, and a cognitive runtime are the path to trustworthy autonomy.Sat, 09 May 2026 00:00:00 GMTVitalii CherepanovAI Agentsvitalii@vbcherepanov.com (Vitalii Cherepanov)Seven principles of real memory for AI agentshttps://medium.com/@vbcherepanov/seven-principles-of-real-memory-for-ai-agents-3029d7d877achttps://medium.com/@vbcherepanov/seven-principles-of-real-memory-for-ai-agents-3029d7d877acAtomic units with lifecycle, strict mode with abstention, causal decision chains, AST-based code identity, internal git, scoring mechanics, and negative memory with rule engines — the recipe behind real cross-session memory.Wed, 06 May 2026 00:00:00 GMTVitalii CherepanovAI AgentsMemoryvitalii@vbcherepanov.com (Vitalii Cherepanov)RAG isn't memory. It's Ctrl+F with embeddings.https://medium.com/@vbcherepanov/rag-isnt-memory-it-s-ctrl-f-with-embeddings-c461b90ac7b1https://medium.com/@vbcherepanov/rag-isnt-memory-it-s-ctrl-f-with-embeddings-c461b90ac7b1Vector search is search, not memory. Three failure modes — chunks lose meaning, no structural distinction between facts, and no temporal validity — make RAG hallucinate confidently without knowing what it doesn't know.Fri, 01 May 2026 00:00:00 GMTVitalii CherepanovAI AgentsMemoryvitalii@vbcherepanov.com (Vitalii Cherepanov)Why AI-Generated Code Is Technical Debt From Day Zerohttps://medium.com/@vbcherepanov/why-ai-generated-code-is-technical-debt-from-day-zero-da3421a73989https://medium.com/@vbcherepanov/why-ai-generated-code-is-technical-debt-from-day-zero-da3421a73989Patterns that quietly accumulate debt: phantom abstractions, copy-paste-by-prompt, silent error degradation, context amnesia between requests, and decorative tests. Human oversight of architecture and immediate refactoring are the antidote.Wed, 15 Apr 2026 00:00:00 GMTVitalii CherepanovAI AgentsBackendvitalii@vbcherepanov.com (Vitalii Cherepanov)Your AI Coding Assistant Has Amnesia. Here's How I Fixed It.https://medium.com/@vbcherepanov/your-ai-coding-assistant-has-amnesia-heres-how-i-fixed-it-a8429f7f7e38https://medium.com/@vbcherepanov/your-ai-coding-assistant-has-amnesia-heres-how-i-fixed-it-a8429f7f7e38Total Agent Memory — an open-source MCP server providing persistent knowledge across sessions. 32 tools spanning storage, self-improvement via error tracking, knowledge graphs, episodic recall, and skill assessment.Mon, 13 Apr 2026 00:00:00 GMTVitalii CherepanovAI AgentsMemoryOpen Sourcevitalii@vbcherepanov.com (Vitalii Cherepanov)I Studied the etcd Codebase — and It Changed How I Write PHPhttps://medium.com/@vbcherepanov/i-studied-the-etcd-codebase-and-it-changed-how-i-write-phphttps://medium.com/@vbcherepanov/i-studied-the-etcd-codebase-and-it-changed-how-i-write-phpSeven architectural principles distilled from etcd's Go codebase, mapped onto everyday PHP/Symfony work: typed contracts, single-responsibility services, composable middleware, observability as architecture, facade APIs, traceable request paths, and explicit dependencies.Mon, 20 Apr 2026 00:00:00 GMTVitalii CherepanovBackendArchitecturevitalii@vbcherepanov.com (Vitalii Cherepanov)ClearVibeArchitecture (CVA) — Complete Guidehttps://vbcherepanov.com/articles/clear-vibe-architecturehttps://vbcherepanov.com/articles/clear-vibe-architectureAn architectural style for backend systems that combines Hexagonal, Outbox/Inbox, Observability, mandatory Feature Toggles, and flow visualisation.Thu, 16 Oct 2025 00:00:00 GMTVitalii CherepanovArchitectureBackendDistributed Systemsvitalii@vbcherepanov.com (Vitalii Cherepanov)VR Microservices Visualizerhttps://vbcherepanov.com/articles/vr-microservices-visualizerhttps://vbcherepanov.com/articles/vr-microservices-visualizerImmersive VR tool for debugging and analysing complex microservice flows with Go, gRPC, and Unity VR — bottlenecks in seconds, request flows in real time.Wed, 15 Oct 2025 00:00:00 GMTVitalii CherepanovBackendDistributed Systemsvitalii@vbcherepanov.com (Vitalii Cherepanov)