https://miasyster.github.io/en/tags/system-design/Recent content in System Design on AI + Quant EngineeringHugoenFri, 01 May 2026 00:00:00 +0000https://miasyster.github.io/en/posts/agent-native-architecture/Fri, 01 May 2026 00:00:00 +0000https://miasyster.github.io/en/posts/agent-native-architecture/When the system operator changes from a human to an LLM Agent, design principles need fundamental rethinking. Humans need GUIs and documentation. Agents need semantically clear tools and constraints that throw errors.https://miasyster.github.io/en/posts/atomic-versioning/Fri, 03 Apr 2026 00:00:00 +0000https://miasyster.github.io/en/posts/atomic-versioning/The most common lie in ML research is ’the results looked great last time.’ What code was used last time? What data version? What parameters? Nobody can say. I used filesystem transactions (temp directory → atomic rename) to create immutable snapshots of every iteration, turning ’last time’s results’ from a memory into a queryable fact.https://miasyster.github.io/en/posts/sandbox-defense-in-depth/Fri, 03 Apr 2026 00:00:00 +0000https://miasyster.github.io/en/posts/sandbox-defense-in-depth/AI-generated code must be executed — otherwise it’s just text. But execution means risk. I didn’t choose container isolation or RestrictedPython. Instead I designed a three-layer defense: reject dangerous structures at compile time via AST, replace the entire builtins at runtime, and enforce OS-level resource limits as a backstop. Each layer handles a different class of risk. Overlapping but not redundant.https://miasyster.github.io/en/posts/why-i-built-my-own-fsm-engine/Fri, 03 Apr 2026 00:00:00 +0000https://miasyster.github.io/en/posts/why-i-built-my-own-fsm-engine/LangChain, LangGraph, CrewAI, PydanticAI — no shortage of AI orchestration frameworks. I evaluated all of them and built my own. Not NIH syndrome. When you need failure-mode-driven mutation strategies, phase-aware multi-model routing with different temperatures, and adaptive evolution based on trajectory analysis, the abstraction layers of general-purpose frameworks become obstacles to route around.https://miasyster.github.io/en/posts/ai-as-operator/Thu, 02 Apr 2026 00:00:00 +0000https://miasyster.github.io/en/posts/ai-as-operator/Letting AI drive research workflows doesn’t mean letting AI decide how the system runs. I made a key separation: AI is just the operator, the execution engine is the law. This decision came from a failure.https://miasyster.github.io/en/posts/design-for-the-endgame/Thu, 02 Apr 2026 00:00:00 +0000https://miasyster.github.io/en/posts/design-for-the-endgame/Most systems are designed to run first, then audited as an afterthought. I inverted the order — first define what questions the system must answer when things go wrong, then work backwards to what each layer must record. This inversion reshaped the entire architecture.