---
title: Projects
tags: meta
portal: true
---

Index of engineering artifacts. Systems depth is the primary axis of this page; machine-learning and deployed artifacts follow.

## Low-Level & Systems

- **[Weenix](/essays/weenix/)**\
  Unix-like kernel in ~7,000 lines of C. Virtual memory, VFS, system calls, threading, device drivers, interrupt handlers, and file systems; custom linker support for running userspace x86-64 ELF binaries. Originally a project from Brown CS 169 (Operating Systems with Lab), extended with further features like pipes and userspace preemption. January – May 2025.
- **[Networking Stack from Scratch](/essays/networking-stack/)**\
  TCP/IP, RIP, UDP, and DNS in Go, supporting file transmission of up to 1 GB across networks of 8 virtual machines. Extended with a fully RFC-compliant SSH implementation (2,000+ additional lines) supporting sustained sessions of arbitrary length. October 2024 – July 2025.
- **[Where Does SIMD Help Post-Quantum Cryptography?](/essays/where-does-simd-help-post-quantum-cryptography/)** · [Artifact](https://git.levineuwirth.org/neuwirth/where-simd-helps)\
  Hand-written AVX2 assembly for ML-KEM / Kyber. 35×–56× speedup over compiler-optimized C for core NTT arithmetic; 5.4×–7.1× end-to-end KEM speedup. Full statistical-analysis pipeline (Mann-Whitney U, Cliff's δ, bootstrapped CIs) on Brown's OSCAR HPC cluster. Phase 1 report and reproducible artifact public; Phase 2 (PAPI, RAPL) and Phase 3 (ARM NEON/SVE, RISC-V V) in progress.
- **[LeVCS](/essays/levcs/)** · [Artifact](https://git.levineuwirth.org/neuwirth/levcs) · [Instance](https://levcs.levineuwirth.org)\
  Distributed version control system in Rust (~10 crates, 194 passing tests at v0.1.0). BLAKE3 content addressing, signed Ed25519 authority chains for protocol-level identity and push authorization, federation as the normal operating mode with three storage modes (full / release / metadata), and a cascading per-file merge engine (textual → format-aware → tree-sitter → wasm plugin) that resolves git's common false conflicts. Substrate complete; workflow surface (PR/review, issues, web UI) deferred. First federation instance at [levcs.levineuwirth.org](https://levcs.levineuwirth.org). April 2026 – present.

## Machine Learning & Deployed

- **[ICD-10-CM outcome calculator](https://levineuwirth.github.io/icd_embeddings/)** · [Preprint](/essays/beyond-comorbidity-indices/) · [Code](https://github.com/levineuwirth/icd_embeddings)\
  Public, read-only calculator for the permutation-invariant Deep Sets model underlying the paper currently under review at *JAMA Network Open*. Takes a diagnosis-code set; returns 30-day readmission and postdischarge mortality predictions with Integrated-Gradients attribution.
- **[NeuroPose](/essays/neuropose/)**\
  3D pose-estimation and kinematic-analysis system for neurological-recovery research in Liqi Shu's laboratory at Brown Neurology. Python/TensorFlow inference pipeline, MATLAB-based statistical post-processing, Rust backend with HTML/JS frontends. 20,000+ lines across four externally-funded sub-projects since 2023.
