Tim Dunn

Summary

Full-stack Ruby on Rails engineer with 8+ years of experience building and maintaining production applications. Specialize in emergency bug fixes, performance optimization, and legacy code maintenance. Proven track record of delivering 10x performance improvements and maintaining mission-critical healthcare infrastructure. Available for remote contracts worldwide with US timezone coverage.

Core Services

Emergency Bug Fixes

24-48hr response for production issues

Performance Optimization

SQL tuning, N+1 fixes, caching strategies

Legacy Rails Upgrades

Rails 4.x → 7.x migrations

Ongoing Maintenance

Monthly retainers, proactive monitoring

Professional Experience

Public Health Informatics Scientist | Southern Nevada Health District

Las Vegas, NV | 2025 - Present

Work on EpiTrax disease surveillance system
Work on EMSA (Electronic Message Staging Area)

AI Training Specialist | Outlier.ai

Remote | 2024 - 2025

Trained AI models using Java and Python, contributing to machine learning model improvement
Evaluated and labeled training data to enhance model accuracy

Contract Ruby on Rails Engineer | Various Clients

Remote | 2017 - 2024

The Farmlink Project: Built MVP connecting farmers with food banks using Rails, GraphQL, and Elasticsearch
Pwnie Express (Outpost24): Full-stack development on Pulse cybersecurity platform (Rails + React/Ember)
Performant Software: Maintained Annotation Studio collaborative document platform
Nathan Research: Delivered 4 projects across Rails, Neo4j, Angular, and Python/Flask

Software Engineer | Southern Nevada Health District

Las Vegas, NV | 2015 - 2017

Optimized Trisano disease surveillance system - achieved 10x performance improvement
Identified and fixed slow SQL queries, refactored Rails code for performance
Added React.js components for improved user experience

Technical Skills

Languages

Ruby, JavaScript, Python, Java, PHP, SQL

Frameworks

Ruby on Rails, React, Ember.js, GraphQL

Databases

PostgreSQL, MySQL, Elasticsearch, Neo4j

Infrastructure

AWS, Docker, Linux, Heroku, CI/CD

Testing

RSpec, Capybara, TDD/BDD

Tools

Git, Redis, Sidekiq, Webpack