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Doogal Simpson

@doogal

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Joined December 2025

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Doogal Simpson's Dev Blogdoogal.dev37 posts

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How to build a profanity filter that actually works

1d ago · 5 min read · TL;DR: A production-ready profanity filter isn't just a list of banned words; it's a pipeline. You start with sanitization to normalize character substitutions, followed by a Trie for efficient prefix

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DSDoogal Simpsondoogal.dev

How Docker Actually Works: A Deep Dive into Namespaces and Cgroups

2d ago · 5 min read · TL;DR: Docker containers are just standard Linux processes restricted by Namespaces and Cgroups. Namespaces provide visibility isolation by partitioning kernel resources like PIDs and networking, whil

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DSDoogal Simpsondoogal.dev

Scaling Profanity Filters: Why I Use Tries for Real-Time Chat

3d ago · 5 min read · TL;DR: When I'm building high-traffic chat systems, a standard list lookup for profanity is too slow because search time grows with the size of the dictionary. I use a Trie (prefix tree) to move to O(

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DSDoogal Simpsondoogal.dev

Why Your Linked List Wants to Be a Bloody Tree

3d ago · 5 min read · Quick Answer: A linked list hits a wall when searching because it’s stuck in linear O(n) time. By giving every node two pointers instead of one, you create a Binary Search Tree (BST). This wacky struc

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32-Element Branching: How Scala Vectors Solve Immutable Memory Pressure

4d ago · 5 min read · TL;DR: Traditional immutable arrays are slow because updating an element requires a full O(n) copy. Scala’s Vector solves this by using a 32-way branching trie. This enables structural sharing, allowi

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Doogal Simpson

About

Available for

Doogal Simpson's blogs

Recently published

How to build a profanity filter that actually works

How Docker Actually Works: A Deep Dive into Namespaces and Cgroups

Scaling Profanity Filters: Why I Use Tries for Real-Time Chat

Why Your Linked List Wants to Be a Bloody Tree

32-Element Branching: How Scala Vectors Solve Immutable Memory Pressure

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Doogal Simpson

About

Available for

Doogal Simpson's blogs

Recently published

How to build a profanity filter that actually works

How Docker Actually Works: A Deep Dive into Namespaces and Cgroups

Scaling Profanity Filters: Why I Use Tries for Real-Time Chat

Why Your Linked List Wants to Be a Bloody Tree

32-Element Branching: How Scala Vectors Solve Immutable Memory Pressure