Open to work · UBC CS · US citizen

Spencer Fletcher

I’m a UBC CS grad who builds high-quality tools for problems I care about, from a live market-making engine, to a Clang/LLVM memory-analysis tool, to Fork, a recipe workspace I built for developing my own recipes. I like taking software from an idea through testing, deployment, and real use.

Email Me Resume →LinkedIn →

Projects

Featured

Automated Market-Making Engine

2026 - Ongoing

A Python market-making engine running live capital on Polymarket US, with 154k+ contracts and $77k+ in gross notional filled over seven weeks. Built on AWS with persistent WebSocket market data, exact-decimal accounting, crash recovery and reconciliation, and an automated test suite of more than 12,000 tests. The system evolved from an earlier cross-venue arbitrage experiment after I measured the practical limits of competing on taker latency.

Market Maker →Arbitrage Engine →

Market selection and tuned parameters are withheld.

Fork: A Recipe Versioning Platform

2025 - Ongoing

I built Fork because I wanted a better way to develop my own recipes without losing track of what changed or which version worked. It’s a full-stack SvelteKit/PostgreSQL recipe workspace with ingredient and instruction history, structured diffs, public/private recipes, and attributed variations. I used the project to learn SvelteKit while building around a problem I genuinely care about.

View Code →Live Project →

MemoryGuard

2024

A Clang/LLVM dynamic-analysis tool for C, co-developed in a four-person course team. It combines AST instrumentation with runtime heap tracking to detect memory leaks and use-after-free and reports findings against the original source. My work included runtime use-after-free detection for aliased heap pointers and peer review across the project.

View Code →

Pipeline3-stage

Your C File

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Stage 1 — AST Instrumentation · Clang / LLVM

Traverses the AST and injects analysis hooks around malloc, free, dereferences, and aliasing.

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instrumented.c

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Stage 2 — Runtime Analysis · C++ shared library

Tracks pointer state at runtime, builds a shadow map of allocations, and records errors to JSON.

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output_report.json

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Stage 3 — Visual Report · Python / Pygments

Annotates the original source with error messages and renders a syntax-highlighted PNG.

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test.png

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Annotated source — exact error locations

OutputAliasing + leak · test.png

#include <stdio.h>
#include <stdlib.h>

// Simple dangling pointer with aliasing
int main() {
    int *p = malloc(sizeof(int));
    int *a = p; /* Variable aliased. */
    *p = 10;
    free(p); /* Attempting to access freed memory! */
    p = malloc(sizeof(int)); /* WARNING: MEMORY LEAK */ /* Allocated but never freed! */
    printf("%i", *a); /* ERROR: DANGLING POINTER */
    return 0;
}

Restyled output — run it yourself →

UBC Medicine — Website Redesign

2022 - 2023

Implemented another team’s redesign of UBC Medicine’s Body Donation Program website in WordPress/JavaScript; body donations more than doubled after launch. Also overhauled a staff directory serving hundreds of users, replacing linear search with binary search over an alphabetized index.

View Code →Live Project →

Hollywood Theatre Automation

2024 - 2025 · Freelance

Built a Google Apps Script tip-splitting workflow (~5 hours/week saved) and a JavaScript marquee letter tracker (~2 hours/week saved) for the Hollywood Theatre in Vancouver.

Source unavailable — client project.

Technical Skills

Programming

Python · C++ · C · TypeScript · JavaScript · Java · Assembly

Web & Data

SvelteKit · React · Node.js · PostgreSQL · Supabase · REST APIs

Systems & Tools

Claude Code · Linux · AWS · Git · Docker · CI/CD · WebSockets