--- title: "Kristofer Jussmann (@ker102) | Hashnode" description: "Agentic AI Architect and technical founder of Kaelux.dev. Read the latest articles by Kristofer Jussmann on Hashnode." url: "https://hashnode.com/@ker102" --- @ker102 # Kristofer Jussmann @ker102 · Tallinn, Estonia · Joined March 2026 Agentic AI Architect and technical founder of Kaelux.dev [Website](https://kristoferjussmann.me/) ### [OpenRoot: supporting the growth of open-source projects](https://blog.kaelux.dev/openroot-supporting-the-growth-of-open-source-projects?utm_source=hashnode&utm_medium=feed) Openroot founder exaplains the misson of the developer program and why it is important that open source developers get more recognition for their work 4 min read · [blog.kaelux.dev](https://blog.kaelux.dev/openroot-supporting-the-growth-of-open-source-projects?utm_source=hashnode&utm_medium=feed) [Oct 19](https://hashnode.com/posts/openroot-supporting-the-growth-of-open-source-projects/6ad642fc82d1ff3267f452b3) ### [Fine-Tuning Is Often the Wrong First Move: Introducing Harneloop](https://blog.kaelux.dev/introducing-harneloop?utm_source=hashnode&utm_medium=feed) An open-source framework for artifact-aware, evidence-gated agent harness evolution 4 min read · [blog.kaelux.dev](https://blog.kaelux.dev/introducing-harneloop?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/introducing-harneloop/6a624c2061cd8153c3ee03eb) [Jul 23](https://hashnode.com/posts/introducing-harneloop/6a624c2061cd8153c3ee03eb) ### [Kaelux: Engineering the Future of Intelligent Infrastructure](https://engineering.kaelux.dev/kaelux-engineering-the-future-of-intelligent-infrastructure?utm_source=hashnode&utm_medium=feed) Engineering intelligent, structured workflows that scale for enterprise needs. 4 min read · [engineering.kaelux.dev](https://engineering.kaelux.dev/kaelux-engineering-the-future-of-intelligent-infrastructure?utm_source=hashnode&utm_medium=feed) [Apr 6](https://hashnode.com/posts/kaelux-engineering-the-future-of-intelligent-infrastructure/69d40ad540c9cabf447808da) ### [What We Learned From Analyzing 28,000 Production AI System Prompts](https://blog.kaelux.dev/28k-ai-system-prompts-analysis?utm_source=hashnode&utm_medium=feed) 80% start with "Act as an expert." 62% contain contradictory constraints. 14% emotionally threaten the AI. Here's the data. 2 min read · [blog.kaelux.dev](https://blog.kaelux.dev/28k-ai-system-prompts-analysis?utm_source=hashnode&utm_medium=feed) [Mar 24](https://hashnode.com/posts/28k-ai-system-prompts-analysis/69c2a34f92029d915f39d491) ### [AI Format Wars: Does the Shape of Your Prompt Matter? (1,080 Evals Later)](https://blog.kaelux.dev/ai-format-wars?utm_source=hashnode&utm_medium=feed) We tested 5 frontier models across 1,080 evaluations. JSON won. Short prompts won. Everything you thought you knew about prompt engineering is wrong. 5 min read · [blog.kaelux.dev](https://blog.kaelux.dev/ai-format-wars?utm_source=hashnode&utm_medium=feed) [Mar 22](https://hashnode.com/posts/ai-format-wars/69c06af7d9da55a9a5ebd499)