Leeon Israel

Software Engineer

Leeon Israel

I love building things that work — products that feel thoughtful, systems that hold up, and code that actually matters to the people using it.

Leeon Israel

The person behind the work

Engineer, builder,
first-generation everything.

I'm a software engineer studying Computer Science at the University of South Carolina. Currently Founding Engineer at Qatalyst Health — building AI-powered products used by clinical staff every day.

Previously at UBS, John Deere, and the USC AI Institute. I care about the full stack — from system design to the interactions users never have to think about. I'm drawn to hard problems, real constraints, and software that holds up in production.

0+Years building
0Projects shipped
0Published paper

Experience

Qatalyst Health
Founding Engineer
Nov 2024 – Present
Columbia, SC

Being one of the first engineers at a healthcare AI startup means doing a bit of everything — and that's exactly what I do. I spend time with MDS nurses, care coordinators, and clinical staff to understand how the product actually fits into their workflow. Those conversations directly shape what I build next, whether that's a new AI feature, a frontend interface that has to work under pressure, a backend service handling sensitive health data, or the DevOps infrastructure that keeps it all running. The flagship product is a document intelligence platform that reads clinical records and surfaces the findings that matter most for Medicare and Medicaid form completion — turning hours of manual review into something fast and dependable. I've shipped features across the entire stack: built the core AI pipeline, designed interfaces used by clinical staff daily, structured the architecture of new features, and am on call for production issues when they come up. Being a founding engineer means the product's quality is personal — there's no one else to blame, and no problem too small or too large to own.

What I took from it: What it actually means to make AI work for real users — not just building the model, but building everything around it so it's reliable, understandable, and genuinely useful in the hands of someone doing critical work.

PythonDjangoReactAWSDynamoDBDatadog
UBS
Software Engineering Intern
Jun – Aug 2025
New York City, NY

Led development of a live market risk AI system that reads financial news in real time, runs it through sentiment agents, and feeds predictions into an XGBoost model — presented directly to the company CTO. Built Python and Java MCP servers that let GitHub Copilot agents autonomously navigate an internal data lake, and designed a resume screening platform that cut hiring research time significantly.

What I took from it: How to deliver high-stakes AI systems under enterprise constraints — where auditability and reliability matter as much as accuracy.

PythonTypeScriptReactLangChainXGBoostAzure SQL
USC AI Institute
AI Research Intern
Jan 2023 – Jan 2026
Columbia, SC

Across three years and three research projects, I worked with different teams at the USC AI Institute on problems at the frontier of applied ML. The most significant was KiMO: Knowledge-infused Multi-agent Orchestrator — accepted to AAMAS 2026 Demo Track. KiMO addresses a core limitation in multi-agent systems: agents can communicate, but don't understand task semantics or coordination constraints. KiMO solves this through structured knowledge infusion — planning ontologies encode domain-specific task decompositions, and agent registries formalize capability constraints for heterogeneous agents. The result is a two-stage pipeline (PlanGen → AgentGen) that produces interpretable, expert-modifiable workflows, demonstrated on a real-time manufacturing pipeline. Previously, I built and benchmarked two RAG-based Q&A systems — one using LangChain, one using LlamaIndex — outperforming a prior custom model significantly. And earlier, I contributed the React frontend for a mental health AI chatbot and processed 10,000+ Reddit posts with Python Transformers and spaCy to build training data for a deception detection classifier.

What I took from it: The rigor of academic AI research, and how the hardest part isn't building the model — it's building something that can be evaluated, reproduced, and explained.

LangChainLlamaIndexReactPython TransformersspaCyKnowledge Graphs
John Deere
AI Engineering Intern
May – Aug 2024
Chicago, IL

Shipped multiple AI features into a production system used at scale. The most impactful was a Retrieval Augmented Generation tool that transformed user support — turning generic search into context-aware, pre-populated support forms. Also built an automated system to continuously purge stale data from the OpenSearch vector store, fixing invisible infrastructure decay that was silently degrading every AI response.

What I took from it: The operational reality of AI at scale — indexing, data freshness, and how invisible infrastructure problems manifest as product quality issues.

PythonLangChainOpenSearchRAG
SEO
Software Engineering Intern
May – Jul 2024
Remote

Completed SEO's competitive engineering program — full-stack development, data structures, and algorithms, delivered through SCRUM-based team projects with real deadlines. Built three full-stack applications over the course of the program. Also trained a CNN for real-time sign language recognition from scratch, winning Best Overall Project at SEO 2024.

What I took from it: Team-based engineering under real deadlines and a deep appreciation for the fundamentals of how ML models actually learn.

PythonReactMySQLCNN
Empowered Buildings
Full Stack SWE Intern
Jun – Sep 2023
New York City, NY

My first professional engineering role. Built a full-stack financial data platform for an energy management company — connecting 300,000+ MongoDB documents to a custom React interface, building a RESTful API across 12+ files, and using Selenium to automate third-party financial data scraping done previously by hand.

What I took from it: How to navigate a real production codebase and ship features end-to-end without hand-holding. The foundation for everything that came after.

JavaScriptReactMongoDBNode.jsSelenium
Bank of America
Global Technology Fellow
January 2024
Remote

Selected for BofA's Early Insights technology program — structured exposure to enterprise-scale engineering practices and leadership at one of the world's largest financial institutions.

DE Shaw & Co.
Connect Fellow
September 2023
Remote

Chosen for DE Shaw's Connect Fellowship — engaged directly with researchers and engineers at one of the most rigorous quantitative investment firms in the world.

HeadStart Fellowship
Technology Fellow
Jan – Apr 2023
Remote

A semester-long virtual fellowship with weekly education sessions, bi-weekly vertical training, and direct access to industry professionals and corporate partners. Participated in the Spring 2023 cohort — building skills across the startup ecosystem through structured learning and community while in my freshman year.

Selected work

Things I've built.

9 projects
APEX Trading

APEX Trading

PythonClaude APILightGBMDuckDBAlpaca

A 30-day live experiment: a Claude-powered autonomous trading agent making disciplined, risk-managed decisions in real markets. Momentum strategy backtested across SPY, QQQ, AAPL, MSFT, NVDA (2020–2024). Sharpe ratio 1.447 · 271.8% total return.

Learned: How to wire real financial data pipelines, backtest strategies rigorously, and think about risk — not just returns. The model is only as good as the data it acts on.

Spotify Splitter

Spotify Splitter

PythonFlaskReact 19Groq APISpotify API

AI-powered playlist optimizer. Splits any Spotify playlist into vibe-based sub-playlists via Groq LLM classification, or reorders for seamless DJ transitions using Camelot harmonic mixing. Handles 700+ track playlists.

Learned: Prompt engineering at scale isn't magic — it's schema design. Structuring the classification task correctly had more impact than model choice.

Signify

Signify

PythonTensorFlowMediaPipeOpenCVFlask

Real-time ASL hand gesture recognition — Best Overall Project at SEO 2024. A CNN reads hand landmarks from MediaPipe, maps to letters, and streams to speech via Google TTS. Zero lag, fully offline inference.

Learned: ML models feel abstract until you see someone use them in real time. Building the full stack — data → model → inference → UI — gave me appreciation for every layer.

Instagram Clone

Instagram Clone

ReactFirebaseViteVercel

Full-featured Instagram clone — 10,500+ lines replicating auth, image/video posting, real-time comments, follows, and an explore feed. React, Vite, Firebase. Live on Vercel.

Learned: Scale in code accumulates fast. Faithfully replicating a complex product's core UX taught me how to manage complexity across a large codebase.

Weather App

Weather App

JavaScriptWeather APIHTML/CSS

Immersive weather app with live sky backgrounds that shift with current conditions. Real-time data: UV index, wind, precipitation — rendered cinematically against live sky photography.

Learned: Constraints drive creativity. Working purely with vanilla JS and a single API forced clean DOM thinking with no shortcuts or framework crutches.

Dorm Dish

Dorm Dish

PythonFlaskOpenAI API

AI-powered recipe suggestions for college students — list your ingredients, get step-by-step recipes tuned to dorm-friendly equipment via OpenAI. Built in a team of four at SEO Tech Developers 2024.

Learned: Team dynamics matter as much as the code. Building under a deadline with four people taught me to scope, prioritize, and communicate clearly.

RentConnect

RentConnect

React NativeExpoAI MatchingReal-time Messaging

A cross-platform mobile app that helps students and landlords discover, list, and match on housing and roommates. Built with Expo and React Native — features AI-powered roommate matching, interactive property maps, real-time messaging, and property reviews.

Learned: Mobile product development requires thinking about the whole experience — state, navigation, real-time data, and the moments between screens. Every detail compounds at the app level.

Calculator

Calculator

JavaScriptHTMLCSS

A clean, minimal calculator — arithmetic operations, keyboard support, dark UI with sharp operator accents. A focused exercise in pure DOM manipulation and UX clarity.

Learned: No framework teaches you how the DOM actually works. A reminder of why fundamentals matter — and why simple things are often harder to do well than complex ones.

Coin:Flipper

Coin:Flipper

PythonFlaskSQLiteCurrency API

Full-stack budgeting app with multi-currency support. Tracks income, expenses, and savings goals with live exchange-rate conversion. Deployed to Heroku with a persistent SQLite backend.

Learned: Full-stack has a lot of surface area. Connecting a Flask API to a persistent backend with real currency conversion gave me a clear picture of how data flows end to end.

Capabilities

What I bring to the table.

AI & Machine Learning

LLMs, RAG pipelines, CNNs, sentiment agents, XGBoost. Built production ML systems in healthcare, finance, and agriculture.

Full Stack Engineering

React, Django, Node.js, Flask. End-to-end product development across 9 shipped applications.

Data & Cloud

AWS, Azure, MongoDB, DynamoDB, OpenSearch, Databricks. Building and maintaining data infrastructure at scale.

Backend & APIs

RESTful APIs, MCP servers, LangChain agents, Python microservices. From solo systems to enterprise integrations.

Developer Tooling

GitHub Actions, Kubernetes, Nginx, Selenium. Automation, CI/CD, and the infrastructure that makes teams faster.

Research & Prototyping

USC AI Institute — knowledge graphs, Q&A systems, deception detection. Rigorous experimentation, honest evaluation.

LanguagesPython·JavaScript·TypeScript·Java·C++·SQL
FrameworksReact·Django·Node.js·Express.js·LangChain·LlamaIndex·Flask
Cloud & InfraAWS·Microsoft Azure·Firebase·Kubernetes·Nginx·Git
Data & AIMongoDB·OpenSearch·DynamoDB·Databricks·RAG·NLP·Grafana
ToolsPostman·Selenium·GitHub Actions·Vercel·Datadog·Jira

Education

University of South Carolina

B.S. Computer Information Systems  ·  3.65 GPA  ·  Minor: Business Information Management  ·  Expected May 2026

Dean's List ×7First-Generation ScholarUSC AI Institute

Relevant Coursework

Algorithmic Design I & IIData Structures & AlgorithmsAdvanced Programming TechniquesSoftware EngineeringWeb ApplicationsDatabase System DesignComputer NetworksComputer SecurityInformation Security PrinciplesDiscrete Mathematics for CSUNIX/Linux FundamentalsStatistical Methods I & IIMobile Application DevelopmentCapstone Computing Project

Get in touch

Let's build something.

© 2026 Leeon Israel