A guide to hiring an RSpec developer
RSpec is a testing tool for the Ruby language. A developer writes short examples that say what the code should do, and RSpec runs them and reports which ones fail. Companies rarely hire for RSpec alone. They hire a Ruby engineer who is very good at tests and who works inside a Rails app or another Ruby project. The notes below cover the job, the signs of a strong candidate and the habits that make remote testing work. They help most when your Ruby app has too few tests, or a suite that has become slow or unreliable.
What RSpec does
An RSpec file reads almost like a list of rules. One block describes a part of the app, and inside it each example states one thing that must be true, such as an order total including tax or a user without a plan being sent to the pricing page. When the code changes, the rules are run again. If a rule no longer holds, the developer sees which one, and why, before the change reaches customers.
Why teams bring in a specialist
Some teams need a safety net. Their app grew quickly with few tests, and every release feels risky. An RSpec developer adds tests for the flows that matter most, starting with money, accounts and data. Other teams need repair. A suite exists, but it is slow, full of random failures or so tangled that nobody wants to touch it. The developer cleans it up and makes it trusted again. A third group wants a higher standard for new work, with test habits and examples the whole team can follow.
RSpec developer, Rails developer or tester?
A Ruby on Rails developer builds features, and writes tests as part of that work. A software engineer may cover several languages and write tests when needed. A manual tester checks the app by hand. An RSpec developer is the right pick when the quality of your automated tests is the problem to solve. On a larger project the specialist often sits next to a Rails developer who owns the features.
Signs that you need one
- Your app has few tests and every release feels risky.
- Your build fails at random, and people rerun it until it goes green.
- The suite takes so long that developers skip it.
- You plan an upgrade of Ruby or Rails and need a safety net first.
- You want the whole team to write tests in the same clear style.
If your suite is healthy and your developers already write good specs, you may not need a specialist. Honest advice like that is worth paying for.
Where the time goes
Test work is not only typing examples. A large share goes into reading the code, learning how the business works and deciding what is worth protecting. Expect the first weeks to produce fewer specs than you hoped for, and a clearer plan. Ask for a short map of the risky parts of the app, and agree an order for the work, so the first tests protect the flows that would hurt most if they broke.
Signs of a strong background
Request a story in which a messy suite became healthy. Good answers describe what was wrong, what the developer changed and how the team felt about the suite afterwards. A resume that is only a list of tools tells you little. Naming FactoryBot or Capybara proves almost nothing. Judgement about what to test, how much to fake and when to stop is what separates a helpful engineer from a busy one.
Questions for the interview
- How do you decide what to test in an app you have never seen?
- A spec passes on your laptop and fails on the build server. What do you check?
- When is a double a good idea, and when does it hide a bug?
- How would you make a suite faster without making it less useful?
- How do you add tests to code with no tests and unclear rules?
Good answers sound like experience. Be wary of anyone who answers every question with a tool name.
A small paid task first
Give each finalist a small piece of your real code. Useful examples are writing specs for one service class, finding why three named specs fail at random, or cleaning up one long, messy spec file. Pay for the time. Compare how easy the examples are to read, how the person copes with awkward cases and how clearly they explain what they chose.
Keeping the suite healthy
A test suite needs care, or it decays. Decide who looks at failing builds, how quickly a flaky spec must be fixed and what the team does with a spec nobody understands. Ask for short notes in the repository that explain your test style, so new people can follow it. Keep the code in an account that your company owns, and remove access when the work ends.
Day to day with your team
Show your developer how a feature moves from idea to release, who reviews code and which parts of the app cause the most trouble. One weekly call and a shared list of test tasks keep everyone aligned. Share the failures you remember best, since those usually point to the gaps that matter most.
Mistakes to avoid
- Testing every tiny detail, so a small change breaks dozens of specs.
- Using many doubles until the specs only repeat the code.
- Retrying failed builds instead of finding out why they fail.
- Putting all the tests in slow browser flows.
For related help, see our Ruby on Rails developers for building the app, or our software engineers for wider engineering help.