// Fractional Developer — Available Now

I Ship Code Fast
& Fix What's Broken

Senior full-stack developer with 8+ years experience. Rails, Python, Java, React — fractional dev capacity for funded startups. 10x performance improvements, month-to-month, no long-term commitment.

Book a Free Call → View Work
// What I Do

Services

One-Time Projects
🩺
Start Here

Rails Health Check

Fixed price $500

Full audit of your Rails app: performance bottlenecks, security gaps, outdated dependencies, and tech debt. You get a written report with prioritized fixes. No commitment after.

  • Performance profiling and N+1 detection
  • Security header and CVE scan
  • Dependency audit with upgrade path
  • Written report with prioritized recommendations
🕷️

Web Scraping & Data Extraction

Projects from $1,500

Custom scrapers for any site. JavaScript-heavy SPAs, login-protected dashboards, anti-bot detection. Delivered as CSV, JSON, Google Sheets, or direct to your database.

  • Python (Scrapy, Selenium, Playwright)
  • Pagination, rate limiting, proxy rotation
  • CAPTCHA handling and stealth scraping
  • Free 50-record test before you commit
⚡

Rails Performance Optimization

Projects from $1,500

N+1 query elimination, database optimization, caching strategy. Most Rails apps have 2-3 quick wins that cut load times in half. Proven: 80% query reduction at Pwnie Express.

  • Full performance audit with before/after metrics
  • N+1 detection and eager loading fixes
  • Database indexing and query optimization
  • Caching layer implementation
🔄

Rails Upgrade & Modernization

Projects from $5,000

Rails 6.1, 7.0, and 7.1 have lost security support. Upgrade to Rails 8 with Hotwire, Solid Queue, and Kamal. Tests passing, deployed, documented.

  • Version upgrade (Rails 5/6/7 to 8)
  • Turbolinks/Webpacker to Hotwire migration
  • Solid Queue, Solid Cache, Solid Cable
  • Zero-downtime deployment with Kamal
🌐

Full-Stack Web Development

Projects from $1,800

APIs, dashboards, internal tools, Chrome extensions. Rails, Python, React, Node. I pick up your existing codebase, understand it fast, and push working code.

  • Ruby on Rails, Python (Flask, FastAPI), React, Next.js
  • REST and GraphQL API development
  • Chrome extensions and browser automation
  • Feature development and bug fixes
🛠️

SaaS MVP Build

From $10,000

Go from idea to working product in 4-6 weeks. Auth, billing, dashboard, API. Rails + React or Next.js. Deployed and ready for your first users.

  • Auth, roles, and user management
  • Stripe billing and subscription management
  • Admin dashboard and analytics
  • Deployed on Railway, Render, or Fly.io
Monthly Retainers
📊
Recurring

Scraping as a Service

From $500/mo

You get the data. I handle everything else. Scrapers built, deployed, monitored, and maintained. When the target site changes, I fix it. Clean data delivered on your schedule.

  • Daily, weekly, or custom schedule
  • CSV, JSON, Google Sheets, or API
  • Breakage monitoring and auto-repair
  • Cancel anytime, month-to-month
🚀
Recurring

Dev on Call

From $1,500/mo

10-20 hours/month of senior dev capacity. Bug fixes, small features, code reviews, deployments. I'm in your Slack, in your codebase, and shipping within 48 hours of kickoff.

  • 48hr response on bug reports
  • Same PR workflow, same conventions
  • Rails, Python, React, Node
  • Month-to-month, cancel anytime
🛡️
Recurring

Rails Maintenance

From $1,000/mo

Keep your Rails app healthy without a full-time dev. Security patches, dependency updates, performance monitoring, and minor fixes. Nothing falls through the cracks.

  • Monthly gem updates and CVE patching
  • Performance monitoring and alerts
  • Minor bug fixes included
  • Monthly health report
// Case Studies

Selected Work

Performance Optimization

Pwnie Express - 2x Performance Improvement

Cybersecurity network discovery platform processing millions of device scans. Inherited slow Rails app with mounting N+1 queries and unoptimized SQL. Delivered 2x performance improvement through systematic query optimization and caching.

⚡
Problem
Slow page loads, N+1 queries
Dashboard taking 8+ seconds to load device scan results. Database queries growing linearly with data volume.
🔧
Solution
Query optimization + caching
Rewrote critical ActiveRecord queries with eager loading. Added fragment caching. Indexed hot paths in PostgreSQL.
📈
Result
2x faster across the board
Dashboard load times cut in half. Database query count reduced 80%. Zero downtime during optimization.
Stack: Ruby on Rails PostgreSQL RSpec Redis Sidekiq
Full-Stack Build

The Farmland Project - Farm-to-Food-Bank Platform

Built a Rails application connecting farmers with surplus produce to food banks in need. GraphQL API, ElasticSearch for location-based matching, and strict TDD throughout.

🌱
Challenge
Complex matching logic
Farmers and food banks needed real-time geo-matching with seasonal availability, capacity constraints, and delivery logistics.
🔧
Approach
GraphQL + ElasticSearch
Built flexible GraphQL API for mobile/web clients. ElasticSearch geo-queries for proximity matching. Full RSpec test suite.
✅
Outcome
Production launch on schedule
Delivered MVP on time. Strict TDD meant zero production bugs at launch. Collaborated directly with product team on feature planning.
Stack: Ruby on Rails GraphQL ElasticSearch PostgreSQL RSpec / TDD
Healthcare Data

Southern Nevada Health District - Disease Surveillance

Optimized public health informatics systems including EpiTrax (disease surveillance) and health statistics applications. Rails + Python + Neo4j handling HL7/FHIR integrations for thousands of healthcare users.

🏥
Scope
Mission-critical health systems
Production systems processing disease reports from hospitals, labs, and clinics across Southern Nevada.
🔧
Work
Performance + integration
Optimized Rails and Flask applications. Built HL7/FHIR data pipelines. Maintained Neo4j graph relationships for epidemiological analysis.
📊
Impact
10x performance gains
Dramatically improved query performance on health statistics dashboards. Reliable uptime for systems serving thousands of users daily.
Stack: Ruby on Rails Python / Flask Neo4j AWS HL7 / FHIR
Legacy Maintenance

Archnet - Historical Archives Platform

Maintained Archnet at Performant Software Solutions - a Rails application hosting thousands of scanned historical architectural documents. Also contributed to their annotation studio using React, Ember, and Backbone.js microservices.

📚
Context
Large legacy codebase
Inherited a mature Rails application with years of accumulated technical debt and thousands of archived documents.
🔧
Work
Maintenance + new features
Bug fixes, dependency updates, new search functionality. Contributed annotation tools across multiple JS framework microservices.
🔄
Skills
Legacy code expertise
Comfortable navigating unfamiliar codebases. Document as I go. Communicate blockers early. No black boxes.
Stack: Ruby on Rails React Ember.js Backbone.js Microservices

// Rails 8 Open Source Projects

📋

Freelance CRM

Lead management with kanban board, interaction tracking, and task management. Rails 8 API + React frontend.

Rails 8 React 19 JWT
💡

Idea Validator

Startup idea scoring across market, problem, solution, and business viability. PDF report generation with Prawn.

Rails 8 Prawn PDF Recharts
📧

Outreach Generator

AI-powered cold email generator using Claude API. Website scraping, campaign management, and 3 email variations per prospect.

Rails 8 Claude API Nokogiri
🏗️

Project Scaffolder

Template-based project generator with variable substitution and downloadable ZIP archives. Seeds React, Express, and Rails templates.

Rails 8 RubyZip React 19
Tim Dunn
// About Me

8+ Years Building Web Applications

I'm Tim Dunn. I've spent 8+ years building and fixing web applications — Rails, Python, Java, React. From greenfield builds to inherited legacy apps with years of tech debt. My clients include cybersecurity platforms, public health agencies, and nonprofit startups.

I delivered a 2x performance improvement at Pwnie Express, built healthcare data pipelines (Rails + Python/Flask) at Southern Nevada Health District, and shipped production apps on deadline with zero launch-day bugs.

8+
Years Experience
10x
Performance Gains

Backend

Ruby / Rails Python / Flask / FastAPI Java Node.js

Frontend & APIs

React / Next.js GraphQL Hotwire / Turbo REST APIs

Data & Testing

PostgreSQL Redis ElasticSearch TDD / RSpec

Infrastructure

AWS Docker Heroku Cloudflare
// Common Questions

FAQ

How does fractional dev work?

I work 10-20 hours per week on your codebase, integrating with your team's workflow. You get senior dev capacity without the recruiting overhead or long-term commitment. Month-to-month, cancel anytime.

What's your response time?

For retainer clients: 24-48 hours for non-urgent issues, same-day for emergencies. US citizen, available for worldwide remote collaboration. I communicate async via Slack or your preferred tool.

What stacks do you work in?

Primary: Ruby on Rails, Python/Django, Java, React/Next.js. I also do one-time projects starting at $1,800 — performance fixes, feature builds, or full MVPs. No retainer required.

How do you handle existing codebases?

I've inherited plenty of legacy apps — Rails, Python, Java, you name it. First week is usually codebase audit and quick wins. I document as I go and communicate blockers early. No black boxes.

// Let's Work Together

Got a Web App That Needs Work?

Book a free 15-minute call. I'll tell you what I'd fix first and give you a ballpark estimate. No pitch deck, no sales pressure.

Book a Free Call → tim@dunnwebstudio.com