W William Kim / portfolio
Currently shipping  ·  Barrington, IL / Staff Accountant @ Ortho Molecular Products / B.S. Computer Science, Pitt '24

Finance × Engineering × AI.

I write journal entries by day and orchestration engines by craft. A hybrid who ships LLM pipelines, multi-agent systems and production cloud apps with the same rigor I bring to a Fast Close. Fluent in GAAP and GPU.

§ 01 · Selected work

Featured projects

Production builds across AI orchestration, agentic automation, mobile, and finance ops. Click any row to expand the case notes.
01

Purelytics

AI ingredient analyzer · React Native
2025 ✓ Multi-AI fallback ✓ Vision scanning

React Native mobile app that uses on-device vision to scan product ingredient labels and deliver health assessments with a color-coded 0–100 scoring system. Supports 12+ product categories with specialized supplement analysis including bioavailability and interaction warnings, and surfaces category-matched healthier alternatives with pricing data.

Multi-AI provider fallback hierarchy (Claude → Gemini → GPT-4o) ensures reliability with zero backend infrastructure. Built with Expo SDK 54, React Navigation, and on-device credential storage.

Vision-based scanning pipeline that photographs ingredient labels for instant evaluation
Multi-AI provider fallback for high-availability analysis
Family profiles with health-specific filtering and full scan archive
React NativeExpoClaudeGPT-4o GeminiVision AIBrave Search API
02

Odyx HQ

Agentic browser automation · Claude-powered
2025 ✓ Self-healing selectors ✓ Human-in-the-loop

Universal agentic Chrome extension that navigates, fills forms, and executes payments on any website through a conversational side panel. An Action Tree pipes a pruned DOM (< 4K tokens) to Claude for planning, with human-in-the-loop confirmation for sensitive operations.

Manifest V3 extension with React 19, Express / Prisma / PostgreSQL backend, Redis-backed JWT auth, Stripe shared payment tokens, and multi-stage Docker containerization for deployment.

Action Tree system that prunes the DOM into < 4K tokens for efficient planning
Self-healing selector strategy with Computer Use as fallback
Tier-based RBAC (Free / Pro / Enterprise) with audit logging
TypeScriptReact 19Claude APIChrome Extension PrismaPostgreSQLRedisStripe
03

Rift Architect

Multi-agent AI coach · Electron desktop
2025 ✓ 4 specialized agents ✓ Vanguard compliant

Multi-agent AI orchestrator for League of Legends that provides real-time coaching across champion select, in-game, and post-game phases. Four specialized Claude-powered agents handle drafting, macro strategy, enemy cooldown tracking with haste adjustments, and post-game wellness.

Electron desktop app with automated client detection via lockfile polling, a serial API queue with token-bucket rate limiting, and interactive draggable overlays with persistent positioning.

Drafting Oracle · Macro Strategist · Spell Tracker · Tilt Guard
Serial API queue with 80% auto-pause to stay inside rate limits
Screen-saver window level escalation for fullscreen visibility
ElectronNode.jsClaude SDKSQLite Riot APIMulti-Agent
04

HYROX Pace

Race prediction engine · FastAPI + React Native
2025 ✓ 200K+ race results ✓ Wearable integration

Race prediction, pacing, and live execution app for HYROX athletes. A 100% deterministic simulation engine built on 200,000+ race results, championship timing data, and physiological research. Delivers three-tier finish-time predictions (conservative, likely, aggressive) with segment-by-segment pacing and risk analysis.

FastAPI async backend with Pydantic v2 and SQLAlchemy. React Native / Expo frontend with Zustand. Apple Health and Google Fit integration with 30-second HR polling and redline alerts.

Deterministic engine with fatigue accumulation and compromised post-station running
Live race tracking with wearable HR and visual redline alerts at 95%+ max HR
Three-tier prediction system with segment pacing and contextual execution cues
TypeScriptPythonFastAPIReact Native ExpoZustandSQLAlchemy
§ 02 · Index

More builds

A working set across orchestration, data ops, FP&A, analytics, and claims. Mostly shipped, some live demos.
LIVE · Orchestration
LLM Orchestration Engine · multi-model routing
Provider-agnostic backend that routes requests across OpenAI, Azure, ONNX, and AWS Bedrock by task, cost and latency. Real-time p50/p95 dashboard.
PythonFastAPIDockerOpenAIAWS
LIVE · Data Ops
DataOps Copilot · AI profiling & quality
Ingests CSV / Excel / JSON and runs schema inference, anomaly detection and data-quality profiling at scale through multi-provider LLM routing.
FastAPIDuckDBPostgreSQLCloud RunReact
FP&A
FP&A AI Dashboard
Automated variance analysis, rolling 3–6 month forecasts and AI-generated executive briefs. Cuts manual reporting time by ~80%.
PythonPandasPower BIForecasting
LIVE · Analytics
Snowflake + Power BI Sales Analytics
End-to-end pipeline: ETL into a star-schema warehouse and interactive dashboards with KPI drilldowns.
SnowflakeSQLETLPower BIDAX
LIVE · Claims AI
ClaimsInvestigator AI
Processes first-notice-of-loss narratives and policy data to generate structured investigation plans with prioritized actions and coverage-issue flags.
PythonFastAPILLM ReasoningREST
SANDBOX · Quantum
Quantum Finance Sandbox
Qiskit programs covering core quantum algorithms (superposition, entanglement, teleportation, Bernstein-Vazirani, Grover's search) plus a classical vs quantum revenue forecaster using variational quantum regression. Organized into basics, algorithms, and finance modules.
PythonQiskitQiskit AerQiskit MLscikit-learn
→ Index continues
A few more on GitHub.
Smaller utilities, experiments, and finance automations live in the repo list. Feel free to poke around.
+ more
§ 03 · Profile

A rare hybrid.

The person who automates the spreadsheet, then builds the AI that replaces the automation.

Staff Accountant at Ortho Molecular Products in Barrington, supporting the Fast Close, reconciliations, internal audits, fixed assets, sales tax remittals and corporate tax filings. Off the clock I ship production AI: LLM orchestration, multi-agent systems, mobile apps, and browser automation. Numbers and neural nets. Currently studying quantum computing in Qiskit: working circuits for core algorithms (superposition, entanglement, teleportation, Grover's) and a classical vs quantum forecaster. IBM Quantum hardware next.

Finance
GAAP · Financial Reporting · Variance Analysis · Forecasting · FP&A · GL Reconciliation
AI / ML
PyTorch · HuggingFace · LoRA / PEFT · RAG · Embeddings · ONNX · OCR · Prompt Engineering
Backend
Python · FastAPI · Node.js · PostgreSQL · DuckDB · Redis · Docker · REST
Frontend
React · Next.js · Expo / React Native · TypeScript · Tailwind
Cloud
AWS · GCP · Azure · Vercel · Cloud Run · GitHub Actions
Data
SQL · Pandas · Snowflake · Power BI · Tableau · DAX · ETL
Exploring
CUDA-Q · IBM Quantum Hardware · Shor's Algorithm · VQE
§ 04 · Certifications
§ 05 · Get in touch

Let's build something.

Open to hybrid finance × engineering roles, AI consulting, and contract builds.