How to Hire a Ruby on Rails Developer: What to Look For
September 01, 2025
Hiring a Ruby on Rails developer is different from hiring a generic backend developer. Rails has its own conventions, ecosystem, and culture — and the best Rails developers think in a very specific way. Knowing what to look for saves you from expensive mismatches.
Here's what we've learned from years of building and outstaffing Rails teams.
1. Look for someone who understands Rails conventions
Rails is built on "convention over configuration." A strong Rails developer doesn't fight the framework — they embrace it. During interviews, ask how they structure a new Rails app, how they handle background jobs, or how they approach database design. Their answers reveal whether they think in Rails or just write Ruby inside a Rails project.
2. Check their understanding of the full stack
Good Rails developers aren't purely backend. They understand how views work, how Turbo and Stimulus fit in, and how to write efficient SQL. Ask about their experience with ActiveRecord performance — N+1 queries, eager loading, and query optimisation are common real-world challenges.
3. Ask about testing
The Rails community has a strong testing culture. A senior Rails developer should be comfortable with RSpec or Minitest, know the difference between unit, integration, and system tests, and understand when to write which. If a candidate has never written tests or thinks they're optional — that's a red flag.
4. Review their approach to code quality
Ask to see code they're proud of — a GitHub project, an open-source contribution, or a code sample. Look for readability, consistent style, and sensible abstractions. Avoid candidates who write overly clever code that's hard to maintain.
5. Evaluate communication and independence
Especially important if you're hiring remotely. A Rails developer who can't explain their technical decisions, doesn't ask questions when stuck, or disappears for days is a liability regardless of their technical skill. Look for someone who communicates proactively and documents their work.
Junior vs Mid vs Senior — what's the difference?
Junior (0–2 years): Can implement features with guidance. Needs code review on everything. Good for well-defined tasks with clear requirements.
Mid (2–5 years): Works independently on features. Can make architectural decisions on a component level. Reviews junior code. The most common hire for growing teams.
Senior (5+ years): Designs system architecture, mentors the team, identifies technical risks early. Essential if you're building something complex or scaling fast.
Where to find Rails developers
- Outstaffing agencies — fastest path to vetted senior talent, especially from Ukraine and Eastern Europe
- Toptal, Arc.dev — pre-screened freelancers, higher cost
- LinkedIn + direct outreach — slower but builds long-term relationships
- Ruby community forums and Slack groups — often where the best developers hang out
What should you pay?
Rates vary significantly by location. Ukrainian and Eastern European Rails developers typically offer the best value — senior developers at $40–70/hour with strong English and European timezone overlap. US-based senior Rails developers often cost $120–180/hour.
We help European and US companies find and onboard senior Rails developers through outstaffing. Get in touch to discuss your requirements.