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RSS FeedA technical notebook where I write down what I learn: data, infrastructure, code, and everything I don't want to forget. Real notes from a practitioner — no editorial filter, production context included.
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Recent Posts
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Batch Means Two Different Things: Why the Term Became Confusing in Data Engineering
In data systems, some of the most common words are also the most overloaded. Few terms illustrate this better than batch . Historically, batch processing described a very specific operating model:
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Why apt upgrade Didn’t Update VS Code (and What Actually Happened)
Problem Statement sudo apt update sudo apt upgrade But Visual Studio Code (Visual Studio Code) remains outdated. sudo apt install --only-upgrade code it updates successfully. This behavior is not
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Tracking Subdomains in PostHog Without Breaking User Journeys
When a website grows, it often stops being just one site. A main domain may coexist with multiple subdomains, such as a marketing site, an events portal, a documentation site, or a learning platform.
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Why Terraform Does Not Deploy Your Lambda Container Image
When teams start packaging AWS Lambda functions as container images, a common misunderstanding appears quickly: “I created the Lambda with Terraform, so why is AWS saying the image does not exist?”
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ABC in Python: What It Is, Where It Comes From, and Why It Exists
When people begin exploring object-oriented design in Python, they eventually encounter this import: from abc import ABC, abstractmethod That usually leads to a natural question: what does ABC mean,
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Can an AWS VPC Have Two Peering Connections? Yes. But Should It?
When teams begin structuring cloud networks in AWS, one of the first connectivity mechanisms they encounter is VPC Peering . It is simple, direct, and usually easy to implement for small environments.
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Sending Events to Multiple PostHog Projects from the Same Website
In some architectures, a single website needs to send analytics events to multiple PostHog projects. This situation commonly appears in the following scenarios: Environment separation (development,
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Lambda vs n8n: A Simple Explanation for Data Workflows
Introduction When building data systems or integrating APIs, a common question appears: should we use AWS Lambda or n8n? Both tools can automate processes, call APIs, and move data between systems,