What does it cost to run an AI agent in production? About €4 a month
Two Railway services, one cron, a webhook, a watchdog and a cost log. The real numbers from the Sunday slides agent's first weeks in production, including the Thursday it failed.
Where the depth lives
Notes from building backend systems: what I designed, what broke, and the reasoning I wish I had written down the first time.
Topics
Four threads I keep pulling on
Not tutorials. Working notes: what I tried, what it cost, and what I would tell myself before starting.
AI
Agents, LLMs, RAG and AI architecture — what I build, test and break.
System Design
Distributed systems, databases, messaging, caching and scaling.
Code & Snippets
Working references from Java, Spring, PostgreSQL, Kafka, Redis and Kubernetes.
Architecture Lab
Full write-ups from problem to trade-offs, with the diagrams to match.
Latest
Recent engineering notes
Newest first. Some are finished thoughts, others are still moving.
Next
Have a system worth arguing about?
I am always up for a conversation about architecture, trade-offs, or a bug that refuses to die.
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