Interviews/Application Development/Ruby Developer

Hire Ruby Developers
who actually ship clean Ruby that you can read tomorrow

With EasyEnv we build a fit test for the role. Use it to cut the noise at the top of the funnel, or to go deep on the candidates who matter.

You can even evaluate how this person works with AI. So you hire the engineer who can ship, not the one who looks good in a slide.

Ruby 3Bundler · gemsSidekiq · Redisrspec · rubocopLive or take-home

Request a Demo Create a Free Account

Real Linux VM

Not a sandbox

systemd, kernel, full toolchain

Browser-based

Zero install for candidates

One link and they are in

Auto-graded

Pass / fail checks per challenge

Plus the full session replay

A great Ruby developer reads code like prose and treats clarity as a feature. The good ones reach for Enumerable before they reach for a loop and write specs that name behavior, not methods. EasyEnv hands the candidate a real gem with a real bug and a stakeholder who wants the deprecation done today.

Inside a live interview

What you see when they work.

Real Ruby gem, real specs, every keystroke recorded.

billing-api

AMS

Billing-api

src

billing.py

auth.py

models.py

tests

test_billing.pyM

test_auth.py

pyproject.toml

README.md

Pybilling.py

from decimal import Decimal

def calculate_total(items: list[dict]) -> Decimal:

# Sum line totals using Decimal for currency precision

total = Decimal("0")

for item in items:

total += Decimal(str(item["price"])) * item["qty"]

return total

candidate@ruby-workspace:~

alice@dev:~/billing-api$

● mainPython 3.12

Claude · ready

Claude

You

Refactor calculate_total to use Decimal for currency math, and add a test.

Claude

Ask Claude...

Mike

Sam

How it works

Three steps. Zero infra to maintain.

Pick the fit test

Use a ready-made challenge or ask us to build one for your stack. Live, take-home, or both.

Send one link

The candidate clicks. A full Linux workspace boots in their browser. No installs, no VPN, no zoom-share.

Review at 2x

Replay the session, read the auto-graded checks, and decide. Most reviews take under five minutes.

The problem

Why hiring a Ruby Developer is hard.

Ruby fluency hides under "I know Rails". The interview has to surface pure-Ruby depth.

Metaprogramming taste is real. CVs cannot show restraint.

Concurrency in Ruby (Threads, Fibers, Ractors) is niche but increasingly needed.

Gem authorship is a different muscle from app development.

The fit test

What we measure for a Ruby Developer.

Every area runs inside a real production-like workspace. The candidate works in a browser, the session records itself.

Object-oriented design

A god-object class. They split into clear responsibilities without breaking callers.

Enumerable fluency

A loop-heavy method. They rewrite idiomatically and explain why.

Sidekiq and background jobs

A queue with a poison-pill job. They isolate and recover.

Metaprogramming with restraint

A define_method that hides a bug. They make it readable.

Performance

A method seen in 30% of profiles. stackprof is wired.

AI collaboration

Allow AI for refactors and grade whether they ran rspec, not just rubocop.

The stack we put in front of them.

Real tools, pre-installed, accessible from the workspace terminal.

Ruby 3BundlerrspecrubocopSidekiqRedisActiveRecordSequelSorbetYARDprystackprofTTY toolkitThorrack

Sample challenges

What a Ruby Developer interview looks like.

Pick from our library or ask us to build a challenge for your stack. Each one is a real workspace, not a snippet.

Challenge 01

The 800-line class

Scenario

A reporting class with too many responsibilities. The candidate has callers in scope.

What you learn

Whether they split by behavior and add specs, not just files.

In the workspace

$ ls challenges/

workspace, runbook.md, README.md

candidate has:

· a real Linux box in the browser
· kubectl, docker, terraform, jq, yq
· cluster, repo and cloud creds pre-wired
· auto-checks running in the background

interviewer sees:

· every keystroke + every command
· terminal + screen recording
· auto-graded pass/fail per check

AI in the loop

Score the engineer, and how they work with AI.

AI writes Ruby that looks idiomatic and changes behavior. EasyEnv records prompts so you see whether the candidate ran rspec, not just rubocop, after the LLM-suggested refactor.

Allow or block AI per question, not per interview

Full prompt and response history replayed in the review

Score "verifies AI output" as a separate signal

Ready to hire a Ruby Developer who ships?

Set up your first interview in under an hour. We will help you build a fit test for this role on your stack.

Request a Demo Create a Free Account

Role FAQ

Hiring a Ruby Developer, answered.

Yes. A skeleton gem with a publish target can be pre-loaded.

Yes. Sorbet runtime and srb can be wired with a typed project.

No. The workspace runs in their browser. Terminal, editor, ports and dashboards are all served from the EasyEnv workspace, so candidate setup is zero.

Each challenge has automated checks (did the service come back, did the test pass, did the right log message appear) plus a recording your team can replay. Most reviews take under five minutes.

Yes. AI access is a per-interview setting. Block it for fundamentals, then allow it later in the loop to assess AI collaboration separately.

Interviews/Application Development/Ruby Developer

Hire Ruby Developers
who actually ship clean Ruby that you can read tomorrow

With EasyEnv we build a fit test for the role. Use it to cut the noise at the top of the funnel, or to go deep on the candidates who matter.

You can even evaluate how this person works with AI. So you hire the engineer who can ship, not the one who looks good in a slide.

Ruby 3Bundler · gemsSidekiq · Redisrspec · rubocopLive or take-home

Request a Demo Create a Free Account

Real Linux VM

Not a sandbox

systemd, kernel, full toolchain

Browser-based

Zero install for candidates

One link and they are in

Auto-graded

Pass / fail checks per challenge

Plus the full session replay

Inside a live interview

What you see when they work.

Real Ruby gem, real specs, every keystroke recorded.

billing-api

AMS

Billing-api

src

billing.py

auth.py

models.py

tests

test_billing.pyM

test_auth.py

pyproject.toml

README.md

Pybilling.py

from decimal import Decimal

def calculate_total(items: list[dict]) -> Decimal:

# Sum line totals using Decimal for currency precision

total = Decimal("0")

for item in items:

total += Decimal(str(item["price"])) * item["qty"]

return total

candidate@ruby-workspace:~

alice@dev:~/billing-api$

● mainPython 3.12

Claude · ready

Claude

You

Refactor calculate_total to use Decimal for currency math, and add a test.

Claude

Ask Claude...

Mike

Sam

How it works

Three steps. Zero infra to maintain.

Pick the fit test

Use a ready-made challenge or ask us to build one for your stack. Live, take-home, or both.

Send one link

The candidate clicks. A full Linux workspace boots in their browser. No installs, no VPN, no zoom-share.

Review at 2x

Replay the session, read the auto-graded checks, and decide. Most reviews take under five minutes.

The problem

Why hiring a Ruby Developer is hard.

Ruby fluency hides under "I know Rails". The interview has to surface pure-Ruby depth.

Metaprogramming taste is real. CVs cannot show restraint.

Concurrency in Ruby (Threads, Fibers, Ractors) is niche but increasingly needed.

Gem authorship is a different muscle from app development.

The fit test

What we measure for a Ruby Developer.

Every area runs inside a real production-like workspace. The candidate works in a browser, the session records itself.

Object-oriented design

A god-object class. They split into clear responsibilities without breaking callers.

Enumerable fluency

A loop-heavy method. They rewrite idiomatically and explain why.

Sidekiq and background jobs

A queue with a poison-pill job. They isolate and recover.

Metaprogramming with restraint

A define_method that hides a bug. They make it readable.

Performance

A method seen in 30% of profiles. stackprof is wired.

AI collaboration

Allow AI for refactors and grade whether they ran rspec, not just rubocop.

The stack we put in front of them.

Real tools, pre-installed, accessible from the workspace terminal.

Ruby 3BundlerrspecrubocopSidekiqRedisActiveRecordSequelSorbetYARDprystackprofTTY toolkitThorrack

Sample challenges

What a Ruby Developer interview looks like.

Pick from our library or ask us to build a challenge for your stack. Each one is a real workspace, not a snippet.

Challenge 01

The 800-line class

Scenario

A reporting class with too many responsibilities. The candidate has callers in scope.

What you learn

Whether they split by behavior and add specs, not just files.

In the workspace

$ ls challenges/

workspace, runbook.md, README.md

candidate has:

· a real Linux box in the browser
· kubectl, docker, terraform, jq, yq
· cluster, repo and cloud creds pre-wired
· auto-checks running in the background

interviewer sees:

· every keystroke + every command
· terminal + screen recording
· auto-graded pass/fail per check

AI in the loop

Score the engineer, and how they work with AI.

AI writes Ruby that looks idiomatic and changes behavior. EasyEnv records prompts so you see whether the candidate ran rspec, not just rubocop, after the LLM-suggested refactor.

Allow or block AI per question, not per interview

Full prompt and response history replayed in the review

Score "verifies AI output" as a separate signal

Ready to hire a Ruby Developer who ships?

Set up your first interview in under an hour. We will help you build a fit test for this role on your stack.

Request a Demo Create a Free Account

Role FAQ

Hiring a Ruby Developer, answered.

Yes. A skeleton gem with a publish target can be pre-loaded.

Yes. Sorbet runtime and srb can be wired with a typed project.

No. The workspace runs in their browser. Terminal, editor, ports and dashboards are all served from the EasyEnv workspace, so candidate setup is zero.

Each challenge has automated checks (did the service come back, did the test pass, did the right log message appear) plus a recording your team can replay. Most reviews take under five minutes.

Yes. AI access is a per-interview setting. Block it for fundamentals, then allow it later in the loop to assess AI collaboration separately.

How to Hire a Ruby Developer | Real-World Ruby Interviews | EasyEnv | EasyEnv

Hire Ruby Developerswho actually ship clean Ruby that you can read tomorrow

What you see when they work.

Three steps. Zero infra to maintain.

Pick the fit test

Send one link

Review at 2x

Why hiring a Ruby Developer is hard.

What we measure for a Ruby Developer.

Object-oriented design

Enumerable fluency

Sidekiq and background jobs

Metaprogramming with restraint

Performance

AI collaboration

The stack we put in front of them.

What a Ruby Developer interview looks like.

The 800-line class

Score the engineer, and how they work with AI.

Ready to hire a Ruby Developer who ships?

Hiring a Ruby Developer, answered.

Hire Ruby Developerswho actually ship clean Ruby that you can read tomorrow

What you see when they work.

Three steps. Zero infra to maintain.

Pick the fit test

Send one link

Review at 2x

Why hiring a Ruby Developer is hard.

What we measure for a Ruby Developer.

Object-oriented design

Enumerable fluency

Sidekiq and background jobs

Metaprogramming with restraint

Performance

AI collaboration

The stack we put in front of them.

What a Ruby Developer interview looks like.

The 800-line class

Score the engineer, and how they work with AI.

Ready to hire a Ruby Developer who ships?

Hiring a Ruby Developer, answered.

Hire Ruby Developers
who actually ship clean Ruby that you can read tomorrow

Hire Ruby Developers
who actually ship clean Ruby that you can read tomorrow