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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Compile-Time Sorting in C++ With Templates: Why Heapsort Falls Apart
Tried implementing sorting algorithms as pure template metaprogramming. Not constexpr , not consteval . The old way, where the compiler does the sorti…
I Taught a Browser to Play Piano — Here's How It Figures Out Which Finger Goes Where
Learning piano is hard enough without guessing which finger hits which key. Most sheet music doesn't bother telling you, and when it does, the fingeri…
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…
GN: Domain-Adaptive Lossless Compression for LLM Conversation Streams
PDF version: github.com/atomsrkuul/glasik-core/blob/master/GN_PAPER_V2.pdf Code: github.com/atomsrkuul/glasik-core (MIT) Robert Rider | Independent Re…
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…
Towards O(1) Computing: Minimizing System Entropy with Data-Centric High-Frequency Processing
Algorithmic Efficiency: The end of O(n) in data access In a data-centric environment, efficiency is not optional. The goal is to achieve constant comp…
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…
Why Chunking Is the Biggest Mistake in RAG Systems
Retrieval-Augmented Generation (RAG) has become the default architecture for building AI-powered document intelligence systems. Most implementations f…
A Strange Permutation Substring Sequence: Introducing OEIS A359012
I’ve been exploring a new integer sequence on the OEIS, A359012, and turned it into a small experiment in “data‑driven number theory”. This post brief…