giehlman.de
"My name's Guybrush Threepwood, and I want to be a pirate!"
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Latest posts
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✉️ Briefe mit ChatGPT im DIN-Format – So einfach geht’s!
Viele Menschen nutzen mittlerweile KI-Tools wie ChatGPT, um Briefe schnell und unkompliziert zu erstellen. Die Idee ist bestechend: Ein paar Stichpunkte genügen – und schon steht das Schreiben. Doch in der Praxis gibt es ein Problem: Das Layout entspricht oft nicht den…
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Running a 20-Minute System Design Monologue – with ChatGPT
Today I ran a focused system design session with ChatGPT, simulating a real-world interview scenario. The objective: to articulate a complete system design in 20 uninterrupted minutes, (unfortunately) without any back-and-forth, questions, or validation during the session. I…
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Monitoring CloudFormation Change Sets with Bash and AWS CLI
We are managing our infrastructure as code with AWS CloudFormation. By 2025, we have around 350 stacks. Once we trigger the changeset creation over our Bitbucket Pipelines, we sometimes miss executing one. After a day of many deployments, we like to keep track of pending change…
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Tell gradle to download the sources of a single dependency (in build.gradle)
Now and then, I use this website to post some notes for myself, so once I forget it, I know where to look it up. This time, it happened again. Since we use our own build chain and scripts (based on gradle or mvn), I wanted to download the sources of a single dependency. My ……
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I Advocated for Containers in 2019 — They Rolled It Out in 2022
Back in 2018, I took on a freelance role at a large organization. Together with one other engineer, we were responsible for keeping dozens of short-lived websites up and running — all the underlying infrastructure, coordination with development agencies, and the bridge between…
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When the System Works but the Process Fails
Some of the hardest lessons in engineering have nothing to do with code. After finishing a technically challenging Android project (a mobile remote support SDK that never saw the light of day due to business reasons), I moved on to a new project with a distributed team. The…
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The Crash That Taught Me Perseverance
My first full-time job after university threw me straight into the deep end. The team was working on a mobile SDK that would allow remote screen sharing and interaction — something like TeamViewer, but built for Android and iOS. I had written a few Android apps before, but this…
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How I Asked ChatGPT to Assess My Engineering Level
At some point, I started wondering: Where do I stand — objectively — in comparison to engineering levels used at companies like Google? Not because I wanted to change jobs.Not because I had something to prove.But because I’ve been building systems for years — alone. Why I Asked…
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What I’ve Learned Throughout the Years, Scaling a System
I’ve spent the last few years building a system that processes and delivers 5+ million physical letters per year – fully automated, GDPR-compliant, and based entirely on AWS.It started as a side project. It became a multi-millon-revenue company. And scaling it taught me things I…
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IAM-Permissions to allow AWS CloudWatch READ-only (Logs, Alarms, Filter, Insights, etc.)
We use this IAM-Policy to grant CloudWatch-Console access to a given user. The user should be able to browse, filter and use Log Insights on all our logs. We also added logs:PutQueryDefinition permission, thus the user can create Log Insights filter queries himself. Please note:…