Subhomoy Haldar
Subhomoy is the founder of Coders’ Compass Publishing, dedicated to creating high-quality educational content for developers and learners. With a passion for making complex topics accessible, he writes about programming, mathematics, and technology.
Subhomoy has a first-class Master of Science degree in Computing Science with distinction from the University of Glasgow, and an integrated Master of Science in Mathematics and Computing from Birla Institute of Technology (BIT), Mesra. Set Theory for Beginners is a published book by him, and he has contributed to several published academic peer-reviewed research articles.
He works full-time as a software developer for Component Sense.
Articles by Subhomoy Haldar
What is RSS, and How Do I Subscribe to Your Website?
BySubhomoy Haldar• • Updated: • Reading Time: 5 mins

A plain-English explanation of RSS, a short tour of feed reader options including FOSS picks, and step-by-step instructions for subscribing to our feeds.
Never Locked Out: Monitoring SSH Reachability with Uptime Kuma and Tailscale
BySubhomoy Haldar• • Updated: • Reading Time: 6 mins

Use Uptime Kuma's TCP port monitor across your Tailscale tailnet to catch broken SSH before you actually need to log in.
A Dead Man's Switch for Docker Compose Updates with Uptime Kuma
BySubhomoy Haldar• • Updated: • Reading Time: 10 mins

A dead man's switch for self-hosted Docker Compose stacks: two shell scripts, a couple cron entries, and a push monitor on Uptime Kuma.
Uptime Kuma: Self-Hosted Monitoring Tool
BySubhomoy Haldar• • Updated: • Reading Time: 7 mins

Self-host Uptime Kuma, a monitoring tool that tracks your services with HTTP, TCP, DNS, and push monitors. Notifications via email, Discord, Telegram, and over 50 other methods.
SearXNG: Self-Hosted Private Search Aggregator
BySubhomoy Haldar• • Reading Time: 6 mins

Self-host SearXNG, a metasearch engine aggregating results from multiple engines. Ad-free results and JSON API for LLM integration.
IT Tools: Self-Hosted Collection of Developer Tools and IT Utilities
BySubhomoy Haldar• • Updated: • Reading Time: 5 mins

Self-host IT Tools, a collection of handy developer utilities like formatters and converters. Keep sensitive data private within your network.
Comparing TODIM and CPT-TODIM for Social Sustainability Assessment in G7 Countries
ByVaishnudebi Dutta and Subhomoy Haldar• • Reading Time: 4 mins


We compare decision-making algorithms to rank G7 countries on social sustainability. CPT-TODIM proves most stable out of TODIM and CoCoSo.
Probability of Real Roots in a Quadratic Equation with Uniform(α,β) Coefficients
BySubhomoy Haldar• • Updated: • Reading Time: 4 mins

We derive a general formula for the probability of real roots when quadratic coefficients are U(α,β), extending our symmetric case result.
Probability of Real Roots in a Quadratic Equation with Uniform(-θ,θ) Coefficients
BySubhomoy Haldar• • Updated: • Reading Time: 3 mins

What's the chance a quadratic has real roots when coefficients are random? We find it's 62.7% using probability theory and Monte Carlo simulation.