Software Engineer with a focus on large cloud systems and AI.https://preichl.xyz/https://preichl.xyz/posts/aws-certified-security-specialty-exam/https://preichl.xyz/posts/aws-certified-security-specialty-exam/After 16 years building on AWS, I finally passed the Security – Specialty exam. A reflection on my certification journey, from easy Associate wins to the surprising success that reignited my interest.Fri, 07 Nov 2025 16:00:00 GMThttps://preichl.xyz/posts/lambda-costs/https://preichl.xyz/posts/lambda-costs/Tracking the monthly cost of each AWS Lambda function in production and its real impact on your budget—isn’t easy. With multiple cost factors, getting a clear picture can be challenging.Tue, 10 Dec 2024 16:00:00 GMThttps://preichl.xyz/posts/cyberattack-paralyzed-indonesia/https://preichl.xyz/posts/cyberattack-paralyzed-indonesia/Hackers paralyzed Indonesia with a massive ransomware attack, then apologized and released the key for free. Discover the full story behind this unprecedented cyber crisis.Fri, 31 Oct 2025 16:00:00 GMThttps://preichl.xyz/posts/private-energy-communities-power-ledger/https://preichl.xyz/posts/private-energy-communities-power-ledger/Feasibility study of blockchain technology deployment in community energy sharing in the Czech RepublicWed, 09 Apr 2025 16:00:00 GMThttps://preichl.xyz/posts/state-hackers-target-the-west/https://preichl.xyz/posts/state-hackers-target-the-west/Nation-state cyber actors are changing the rules of engagement. Unlike opportunistic ransomware, state-sponsored groups from Russia, China, and Iran pursue strategic targets with unlimited resources-while the West's moral constraints may leave it vulnerable.Sat, 18 Oct 2025 16:00:00 GMThttps://preichl.xyz/posts/private-grid-power-ledger-czech/https://preichl.xyz/posts/private-grid-power-ledger-czech/Praktická ukázka implementance technologie blockchain v rámci komunitního sdílení energie v České republiceTue, 08 Apr 2025 16:00:00 GMThttps://preichl.xyz/posts/the-fragile-reality-of-modern-it/https://preichl.xyz/posts/the-fragile-reality-of-modern-it/Modern IT systems appear reliable but are built on fragile foundations. From status pages that fail during outages to banks going offline due to distant data center failures, true redundancy is rare because it's expensive and often undervalued until disaster strikes.Fri, 24 Oct 2025 16:00:00 GMThttps://preichl.xyz/posts/the-200-dollar-divide/https://preichl.xyz/posts/the-200-dollar-divide/Four students in a Bali café were building software by hand, no AI. I pay more for a Claude plan than that costs them in a month. That gap is going to be hard to cross.Sun, 31 May 2026 16:00:00 GMThttps://preichl.xyz/posts/runecs-introduction/https://preichl.xyz/posts/runecs-introduction/Migrate databases in AWS ECS effortlessly with the runecs CLI. Simplify your workflow, reduce downtime, and keep your deployments smooth! Fri, 30 Aug 2024 16:00:00 GMT