@safi-io

Encapsulating External Dependencies with Dagster Resources

Apr 12 · 5 min read · Why Encapsulation Matters in Data Pipelines In real-world pipelines, external systems (databases, APIs, queues) are stateful, unreliable, and slow. Directly calls to them inside ops/assets creates: T

Mastering Dagster Sensors

Apr 6 · 5 min read · Introduction What are Dagster Sensors? Dagster Sensors are components that monitor external systems (like storage, APIs, or databases) and trigger pipeline runs when specific conditions are met. They

How Docker Breaks UFW and Alters iptables

Jan 15 · 4 min read · Let me set the context for this article: I was deploying some applications on my VPS, and while I had configured UFW (Uncomplicated Firewall), the ports published by Docker were still exposed directly to the internet. In this article, we’ll explore t...

Object Calisthenics Concepts

Jan 9 · 4 min read · Object Calisthenics is a set of 9 coding rules meant to improve object-oriented design, code readability, and maintainability. It’s not a framework or a library.Think of it as discipline for writing clean OOP code, similar to how physical calisthenic...

Building a University Timetable System Using FastAPI, PostgreSQL, React, and Flutter

Nov 22, 2025 · 4 min read · Introduction When I joined university in September 2023, I encountered a problem every student knew too well:Every day, almost 4–5 times, students had to open a PDF file just to check: Where is the next lecture? Which teacher will take it? In whic...