Tim Dunn - Senior Software Engineer Resume

Professional Summary

Full-stack software engineer with 8+ years of experience building scalable web applications and public health informatics systems. Deep expertise in Ruby on Rails performance optimization and healthcare data integration (HL7/FHIR, ELR, disease surveillance). Proven track record of delivering 2x performance improvements, maintaining production systems serving thousands of users, and translating complex healthcare requirements into reliable technical solutions. US-based experience with availability for worldwide remote collaboration.

            Core Specializations: Rails Emergency Bug Fixes | Legacy Code Optimization | Healthcare API Integration (HL7/FHIR) | Performance Tuning | TDD/RSpec
        

Technical Skills

Languages Ruby, Python, Java, PHP, JavaScript, SQL, HTML/CSS Frameworks Ruby on Rails, Django, Flask, React, Angular, Next.js, Tailwind CSS Databases PostgreSQL, MySQL, Neo4j, Elasticsearch DevOps/Cloud AWS, Docker, Heroku, Linux Server Administration, Vercel, Cloudflare Health IT EpiTrax, EMSA, OpenEMPI, HL7/FHIR, Electronic Lab Reporting (ELR), Disease Surveillance Testing/Tools TDD, RSpec, Capybara, Git, GraphQL, REST APIs, Microservices

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 code training data to enhance model accuracy for developer-focused AI tools

Contract Ruby on Rails Engineer | Various Clients

Remote | 2017 - 2022

Pwnie Express

Optimized network discovery application performance by 2x through Ruby on Rails and SQL query optimization

The Farmland Project

Built Rails application connecting farmers with food banks using GraphQL, ElasticSearch, and PostgreSQL
Practiced strict TDD with RSpec; collaborated with product team on feature planning

Performant Software Solutions

Maintained Archnet, a Rails application hosting scanned historical archives
Contributed to annotation studio using React, Ember, and Backbone.js microservices

Southern Nevada Health District (Contract)

Optimized Health Statistics application using Rails, Python/Flask, Neo4j, and AWS

Software Engineer | Nathan Research

Remote | Apr 2016 - Jun 2017

Built multilevel marketing platform with Rails and Neo4j graph database
Developed CSV uploader processing 8 tables per row with AWS S3 integration
Created API generator tool producing Tests, Controllers, and Models from configuration templates

Software Engineer | Genetic Direction

Remote | Nov 2015 - Apr 2016

Built APIs for genetic reporting engine using Ruby on Rails
Practiced TDD with Capybara, RSpec, and comprehensive integration testing

Key Achievements

2x Performance Improvement: Optimized critical Rails applications through query optimization and caching strategies
Healthcare Integration Expert: One of few developers with combined Rails expertise AND HL7/FHIR healthcare data integration experience
50+ Projects Delivered: Consistent track record of on-time delivery across diverse client engagements
Production Systems: Maintained mission-critical disease surveillance systems serving thousands of healthcare users