David Nguyen • Former Pro Player

I build things
that make money.

Developer focused on trading systems, automation, and full-stack applications. App Academy grad. I like turning ideas into products that solve real problems — from prediction market bots to client websites to mobile fitness apps.

6+
Projects shipped
3
Live products
2022
App Academy
Projects

What I've built

Real projects with real users, real money, and real results. No tutorial clones. Some repos private to protect trading edge.

Automated Trading

Polymarket Trading System

Production arbitrage bot for Polymarket prediction markets. Scans hundreds of markets in real-time for price inefficiencies, buys both YES and NO outcomes when combined price is under $1.00 to lock in guaranteed profit. Fee-aware execution across sports, political, and crypto markets with dynamic position management and risk controls. My most developed project.

Python asyncio Web3.py Polygon WebSocket
polymarket-arb
[SCAN] 847 active markets found [FILTER] 312 with sufficient liquidity [ARB DETECTED] Fed Rate Cut June YES ask: $0.39 NO ask: $0.59 Total: $0.98 Spread: 2.0% (fee: FREE) *** EXECUTING *** BUY YES 500 shares @ $0.39 = $195 BUY NO 500 shares @ $0.59 = $295 Cost: $490 Payout: $500 (guaranteed) Profit: +$10.00 (2.04%) -------------------------------------- Daily P&L: +$142.50 Exposure: 38% (limit: 50%) Pairs active: 12
Automated Trading

NQ Futures Trading Bot

Automated /MNQ futures trading system built for TopstepX prop firm evaluation. Combines key level rejection with a "God setup" cascade pattern detector. Real-time news sentiment filtering, regime-based position sizing, and risk management. Handles real capital.

Python TopstepX API FastAPI SQLAlchemy Finnhub
unified-bot
====================================== UNIFIED TOPSTEP BOT - 11:00:15 ====================================== Price: 25,579.25 Daily P&L: $+258 | Vol: LOW Sizer: Base 2 + Reserve 2 Sentiment: BEARISH (weak) REGULAR SETUP: 4H Trend: DOWN Key Level: Resistance @ 25653 Rejection: Bearish candle *** ENTRY SIGNAL *** SHORT Entry: 25,579.25 Stop: 25,629.25 (50pt = $200) Target: 25,504.25 (75pt = $300) -------------------------------------- 1hr later... EXIT: Target hit P&L: +75 pts = +$300 ======================================
Cloud Automation

Swing Trading Bot

Cloud-automated swing trading system that runs entirely on GitHub Actions — no server required. Scans a 5-stock watchlist twice daily, enters on MA/VWAP confluence, manages positions with trailing stops, and sends real-time Discord alerts. Backtested 2023-2025 across all tickers.

Python Alpaca API GitHub Actions Discord Finnhub
SymbolReturnWin RateMax DD
NVDA+148%71%9.7%
TSM+61%72%8.3%
TQQQ+51%62%9.7%
GOOG+42%62%8.3%
CRM+22%60%14.2%
Backtest results 2023-2025 · Paper trading
Trading

Trading Journal

Personal trading journal tracking live trades, P&L, and strategy notes across futures, stocks, and prediction markets. Built as a web app to log entries, review performance, and stay accountable.

Next.js Vercel

pw: GG123$%

trading-journal
Trading Journal ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Live trade logs P&L tracking Strategy notes & reviews Password protected
Client Work

Green Image Tree Service

Full marketing website + Google Ads campaign for a DFW tree care company. 43 hand-built pages with 10 geo-targeted city landing pages, 15 service pages, live NWS storm alerts, dark mode, video hero carousel, and a 12-campaign Google Ads architecture with 190+ keywords. Designed to dominate local search.

HTML/CSS/JS Vercel Google Ads SEO NWS API Decap CMS
greenimagetreeservice.com
Tree Service · DFW
43 pages · 10 cities · 12 ad campaigns
15
Services
190+
Keywords
7
Articles
Mobile App

FLXN — AI Fitness Coach

AI-powered fitness app that unifies workout programming, nutrition tracking, and body composition goals under one intelligent system. The core differentiator: an AI coach that coordinates training and nutrition together, adjusting workouts based on cut/bulk/maintain phases. Built with React Native + Supabase.

React Native Expo TypeScript Supabase tRPC RevenueCat
Intelligence Tool

Polymarket Whale Tracker

Real-time monitoring system that tracks positions and trades of top Polymarket traders. Detects position changes, identifies arbitrage pairs, and pushes Discord alerts for significant moves. Built for edge — knowing what the smart money is doing before the market prices it in.

Python aiohttp Discord Webhooks asyncio
whale-tracker
[WHALE ALERT] @trader_0x4f2a Position change detected Market: Fed Rate Cut June Side: YES Size: $42,800 (+$18,200) Avg: $0.62 -------------------------------------- [WHALE ALERT] @trader_0x8b1c New position opened Market: BTC > 80k by March Side: NO Size: $31,500 Avg: $0.44 -------------------------------------- [ARB] Spread detected: 3.2% Fed June YES vs Jul NO
E-Commerce

Aurelle

Women's wellness supplement brand. Designed and built the storefront from scratch — product cards, scroll animations, science-backed ingredient breakdowns, subscription model, and review integration. Targeting the 35+ women's health market with clinically-studied formulations.

React E-Commerce Product Design Branding
Aurelle homepage design
Research Tool

Product Research Bot

E-commerce product discovery tool that combines Google Trends, Amazon competition analysis, Shopify saturation checks, and Reddit sentiment to score product opportunities 0-100. Streamlit web UI for team collaboration. Built to find winning products before they go mainstream.

Python Streamlit Playwright VADER Sentiment
product-research
Analyzing: Dome Foundation Brush Google Trends: ████████▁▁ 78/100 Amazon Comp: ███▁▁▁▁▁▁▁ Low Shopify Satur: █████▁▁▁▁▁ Med Reddit Sentim: ███████▁▁▁ +0.72 COGS: $3.20 Sell at: $19.99 Margin: 68% -------------------------------------- Overall Score: 82/100 Verdict: ✓ GO (7/7 checks passed)
Web App

Ryze Trait Tracker

TFT composition optimizer with real-time trait suggestions, cost-optimized team building, and mobile-responsive design. Live and used by the community. Because I also play the game.

React Vite CSS
Ryze Tracker screenshot
Skills

Tech I use

I reach for whatever solves the problem. Most comfortable in Python and TypeScript.

Languages

Python TypeScript JavaScript SQL HTML/CSS

Frontend

React React Native Expo Vite Tailwind CSS

Backend

FastAPI Express tRPC SQLAlchemy Drizzle ORM

Infrastructure

Vercel Supabase GitHub Actions Git

Trading & Data

Alpaca API TopstepX API Web3.py Finnhub pandas asyncio

Tools

Playwright Discord Bots Streamlit Claude Code
Resume

Experience & Background

Professional experience across tech, autonomous vehicles, and esports.

Experience
Autonomous Vehicle Specialist Dec 2025 - Present
TaskUs (contracted to Waymo)
  • Operate within Waymo's autonomous vehicle fleet, interfacing directly with ML-driven perception, prediction, and planning systems in real-time production environments.
  • Troubleshoot edge cases where ML models encounter novel scenarios, providing structured feedback that feeds into model retraining and performance improvement pipelines.
  • Execute vehicle lifecycle operations including diagnostics, field readiness checks, and incident documentation, supporting fleet reliability at scale.
  • Collaborate cross-functionally with remote engineering teams to escalate and resolve system-level issues affecting autonomous driving performance.
Tech Consultant Oct 2024 - Apr 2025
MarketSource
  • Advised 50+ clients weekly on tailored technology solutions, combining product expertise with needs analysis to match users with the right tools.
  • Achieved top 10% customer satisfaction scores through technical troubleshooting and clear communication of complex concepts to non-technical audiences.
Real Estate Sales Assistant Jan 2022 - Sep 2024
Home Boys, LLC (Land Development & Sales)
  • Supported licensed agents with administrative tasks, marketing, and client communication.
  • Generated leads, scheduled appointments, and managed social media for property listings.
Event Administrator 2022
Wisdom Media
  • Coordinated live events with staff and participants, handling moderation, customer support, and real-time technical troubleshooting.
Esports Manager & Professional Player 2017 - 2021
Equinox Esports / Spacestation Gaming
  • Managed financial operations including budget planning and negotiating six-figure annual salaries with investors for a 5-player roster.
  • Competed professionally in FPS titles (2017-2018, 2020-2021), streaming and competing on Twitch as a core part of the esports ecosystem.
  • Supervised team operations, mentored junior managers, and coordinated with tournament organizers across multiple competitive seasons.
Technical Skills
Python JavaScript TypeScript SQL Go (learning) React Flask Node.js asyncio Web3.py REST APIs WebSocket AWS Git CI/CD Linux Docker Polygon/MATIC
Education
Full-Stack Web Development
App Academy • 2022
Biology
University of Texas at Arlington • 2015 - 2017
Pre-Med Studies
Baylor University • 2011 - 2013
Competitive Gaming

Esports Career

Competed at the highest level across multiple titles. Same drive now goes into building products.

Valorant

China Nguyen / Equinox (2020)

Spacestation Gaming (2021)

Team Manager — Women's team (2022)

League of Legends

Peaked Challenger — Solo Queue & 5's

Top 16 Collegiate (2015-2016)

Heroes of the Storm

Professional Player (2016)

Collegiate Grand Finals — 2nd Place (2016)

(School won the following year)

Fortnite

$5,000+ tournament earnings (2017-2018)

CS:GO

ESEA MDL — Semi-pro (2018)

Teamfight Tactics

Peaked Top 5 — Sets 1 & 2 (2019-2020)

Challenger — Every set played

Streamer — 50-100 avg viewers (2 years)

About

Who I am

I'm David — a developer based in DFW, Texas. I studied software engineering at App Academy and spend most of my time building things that either make money or solve a problem I personally have.

My background is a mix of automated trading systems (futures, stocks, prediction markets), full-stack web/mobile apps, and client work. I've built bots that handle real capital, websites that rank on Google, and tools that help people make better decisions.

Outside of my full-time role at Waymo, I'm building side projects, at the gym, or on the pickleball court. I believe in shipping fast, learning from real usage, and not overthinking things.

Trading

Active /MNQ futures trader. Built two trading bots (swing + intraday) and a private trading journal. Currently working through a Topstep prop firm evaluation.

Ex-Pro Gamer

Former professional Valorant player, top-ranked in League of Legends, TFT, Fortnite, CS:GO, and Heroes of the Storm. Built community tools (Ryze Tracker, TFT Stats Project) during my competitive days. Now I channel that competitive energy into fitness and entrepreneurship.

Business

Researching e-commerce (dropshipping validation framework) and doing client web development. Always looking for the next opportunity.

Let's work together

Open to freelance work, collaborations, and interesting problems.