Hudson River Trading OA Experience: Two Trading-Style Coding Questions Breakdown
I recently completed the online assessment for Hudson River Trading (HRT) , and my biggest takeaway was this: the questions themselves were not imposs…
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When Information Hits a Wall: Barriers in Cellular Automata
TL;DR: Add one frozen cell to a cellular automaton and watch the entire pattern reshape itself. This post explores what happens when you introduce a s…
Fast and Slow Pointer Pattern: Cycles, Duplicates, Symmetry
Fast and Slow Pointer Pattern: How to Recognize It and Use It in Interviews AI changed the interview conversation, but it didn't kill technical assess…
Building a Saju Engine: Case Study with Karina's Birth Chart Algorithm
The Data Problem K-pop Poses to Backend Engineers Here's a fun engineering challenge that landed on my desk last year: how do you build a production-g…
Binary search is O(log n), but that's not the whole story
Everyone learns binary search as the textbook example of O(log n) efficiency. Halve the search space, halve it again, find your answer in logarithmic …
a claude code/codex plugin to run autoresearch on your repository
i built https://github.com/evo-hq/evo for those of you who are autoresearch pilled , or have been meaning to get into autoresearch but dont know how. …
I built a tool that visualizes your code step by step — Recursive
Recursive is a open-source tool that lets you paste your code and watch it execute line by line. No setup, no breakpoints — just paste and run. Try it…
I Built a Compression Algorithm That Beats Gzip in 2 Weeks. I Have an A+ Cert.
How a networking student ended up writing Rust, beating industry-standard compression, and learning more about computers than any classroom taught me.…
How I Built an HFT Matching Engine (And All The Things I Got Wrong)
I'm a second-year CSE undergrad. A few months ago I decided to build a limit order book matching engine in C++, the kind that sits inside exchanges an…
No wall clock required: a 64-bit ID generator from a counter + reversible permutation
No wall clock required: a 64-bit ID generator from a counter + reversible permutation permid64 — Clock-free, persistent, reversible-permutation 64-bit…
The Art of Self-Mutating Malware
Article Summary : This article systematically elaborates on the technical evolution and implementation principles of self-mutating malware, covering t…