Blog — Artur MrowickiTechnical articles and case studies: production stabilisation, legacy system modernisation, process automation with AI.https://arturmrowicki.plen-USBecause the light is better here (or: the complaining engineer)https://arturmrowicki.pl/en/blog/bo-tu-jest-jasnohttps://arturmrowicki.pl/en/blog/bo-tu-jest-jasnoI built an AI-powered CRM for cold-calling companies. It works. But the hero turned out to be the most boring piece of code in it — and the AI layer I actually cared about was blind.Mon, 29 Jun 2026 00:00:00 GMTaisalescrmreflectionsWhy I don't hand AI all of myselfhttps://arturmrowicki.pl/en/blog/dlaczego-nie-oddaje-ai-calego-siebiehttps://arturmrowicki.pl/en/blog/dlaczego-nie-oddaje-ai-calego-siebieShould you give AI the whole personal.md — finances, fears, goals, writing style? I'd rather treat context as architecture, not a diary. On staying in control of which version of you the model amplifies.Sun, 14 Jun 2026 00:00:00 GMTaiprompt-engineeringcontextreflections58 commits in 8 days — building a site that qualifies leads for mehttps://arturmrowicki.pl/en/blog/58-commits-8-days-portfolio-buildhttps://arturmrowicki.pl/en/blog/58-commits-8-days-portfolio-buildFrom empty repo to a portfolio with AI consultant, Stripe payments, and bilingual content. The full build story of arturmrowicki.pl — decisions, mistakes, results.Sun, 22 Mar 2026 00:00:00 GMTcase-studyaiportfolioastrobuild-in-publicfreelanceHow I built a two-tier AI consultation system in 1 dayhttps://arturmrowicki.pl/en/blog/ai-consultation-systemhttps://arturmrowicki.pl/en/blog/ai-consultation-systemCase study: sales funnel powered by Claude Haiku and Opus, integrated with Stripe, Supabase, and Resend. Architecture, prompt engineering, economics.Sun, 15 Mar 2026 00:00:00 GMTcase-studyaiclaudestripeastroautomation36 commits, 1 revert, and 4 prompt versions — what prompt engineering actually looks likehttps://arturmrowicki.pl/en/blog/prompt-engineering-iterationhttps://arturmrowicki.pl/en/blog/prompt-engineering-iterationThe iterative process of building a qualifying bot: from MVP through 15 rules, a failed Gemini experiment, a full revert, to an urgent form with Telegram. An honest story without success bias.Sun, 15 Mar 2026 00:00:00 GMTprompt-engineeringaiclaudegeminicase-studylessons-learnedHow a code bug let employees withdraw their salary multiple timeshttps://arturmrowicki.pl/en/blog/studio-manager-case-studyhttps://arturmrowicki.pl/en/blog/studio-manager-case-studyCase study: audit of a no-code system, fixing critical payment, OAuth, and Telegram webhook bugs. How Fixer IT rescues systems.Sun, 01 Mar 2026 00:00:00 GMTcase-studysystem-rescuesupabasesecurity