Software Engineer · AI Systems

Building AI technologies with AI tools.

I learned Computer Science first, then learned the inside of LLMs by hand. Now I build with both: the substrate underneath and the tools on top.

To understand how Transformers and GPTs actually work, I hand-coded them — following Karpathy's Neural Networks: Zero to Hero end-to-end — before I let AI tools touch my workflow at all. Once I understood the substrate, I started using AI for development gradually and deliberately.

To work the way real teams do, I held to professional practices — feature branches, pull requests that carry the reasoning, versioned releases, decisions documented as I made them.

That sequence matters. When an AI tool is wrong, I notice. When a model fails silently, I know how to diagnose it. The work below is built on that footing.

Selected work

Where models meet real engineering.

Engineering case studies. Each project links to a full technical write-up.

Toolkit

The whole stack, not just the top of it.

Foundations

  • Neural Networks
  • LLM Internals
  • Transformer architecture
  • Attention mechanisms
  • Tokenization · BPE
  • Backpropagation
  • Karpathy — Zero to Hero

AI / ML

  • PyTorch · Transformers
  • Generative AI · LLMs
  • RAG · Agentic AI
  • Multi-Task Learning
  • Prompt Engineering
  • Structured Outputs
  • Scikit-learn

Languages

  • Python
  • C · C++
  • JavaScript
  • Dart
  • Java · Swift
  • SQL
  • HTML · CSS

Frameworks & Tools

  • Flutter · Flask
  • Pandas · NumPy
  • Matplotlib
  • Git
  • Linux · UNIX
  • Amazon EC2
  • Arduino · Raspberry Pi

Background

William Opyrchal

Experience

ML Software Engineer Intern

Epcom Corporation · Summers 2024–2025

Researched and built a Transformer-based predictive maintenance system for multivariate time-series sensor data. Integrated retrieval-augmented LLMs with maintenance records and failure-mode data using prompt engineering and structured outputs; built data pipelines and evaluation harnesses for iterative model development and benchmarking.

Software Development Intern

Epcom Corporation · Summers 2020–2023

Built full-stack components of an Applicant Tracking System — Linux · Apache · MySQL · PHP · JavaScript · Bootstrap, deployed on Amazon EC2. Wrote automated cron jobs with pattern recognition to ingest applicants from IMAP email.

Education

University of Florida

B.S. Computer Science · August 2025

St. Petersburg College

A.A., Cum Laude · GPA 3.7

Independent Coursework

Harvard CS50; MIT OpenCourseWare — Calculus, Differential Equations, Linear Algebra, Physics I–III, Artificial Intelligence (6.034); Stanford CS229 (Machine Learning).

Ready to Build.

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