Interviews/Specialty Stacks/Rails Developer

Hire Rails Developers
who actually ship Rails that scales with the team

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.

Rails 7+Active RecordSidekiq · Solid QueueHotwireLive 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 Rails developer treats convention as a starting point and breaks it on purpose. The good ones reach for service objects with restraint, scope queries before they paginate, and ship Hotwire that does not bloat the DOM. EasyEnv hands the candidate a real Rails app with an Active Record N+1 in a fat controller.

Inside a live interview

What you see when they work.

Real Rails app, real Active Record, 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@rails-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 Rails Developer is hard.

Rails feels easy and rewards depth. The interview has to find it.

Active Record is fluent in writes and rough on reads. Few candidates know the diff.

Background jobs are where data goes wrong. Idempotency is the signal.

Hotwire versus React is a real architectural choice on Rails today.

The fit test

What we measure for a Rails Developer.

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

Active Record discipline

A controller firing 80 queries. They use includes correctly.

Service and model design

A fat model. They extract a service or a concern.

Background jobs

A Sidekiq job that is not idempotent. They make it safe.

Migrations and indexes

A migration adding a column without a default on a big table. They split.

Hotwire and Turbo

A Turbo Stream returning the whole page. They scope to the frame.

AI collaboration

Allow AI for refactors and grade whether they ran rspec after.

The stack we put in front of them.

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

Rails 7+Ruby 3Active RecordPostgreSQLSidekiqSolid QueueSolid CacheHotwireTurboStimulusrspecrubocopBrakemanDevisePunditActiveStorage

Sample challenges

What a Rails 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 dashboard with 80 queries

Scenario

A Rails dashboard firing one query per row plus joins.

What you learn

Whether they fix with includes, preload or eager_load and explain the diff.

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 Rails that loops over associations. EasyEnv records prompts so you see whether the candidate read the query log after the LLM-suggested change.

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 Rails 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 Rails Developer, answered.

Yes. A Turbo + Stimulus app with broadcastable streams can be pre-loaded.

Yes. Rails 8 Solid Queue and Solid Cache can be wired without Sidekiq.

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/Specialty Stacks/Rails Developer

Hire Rails Developers
who actually ship Rails that scales with the team

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.

Rails 7+Active RecordSidekiq · Solid QueueHotwireLive 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 Rails app, real Active Record, 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@rails-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 Rails Developer is hard.

Rails feels easy and rewards depth. The interview has to find it.

Active Record is fluent in writes and rough on reads. Few candidates know the diff.

Background jobs are where data goes wrong. Idempotency is the signal.

Hotwire versus React is a real architectural choice on Rails today.

The fit test

What we measure for a Rails Developer.

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

Active Record discipline

A controller firing 80 queries. They use includes correctly.

Service and model design

A fat model. They extract a service or a concern.

Background jobs

A Sidekiq job that is not idempotent. They make it safe.

Migrations and indexes

A migration adding a column without a default on a big table. They split.

Hotwire and Turbo

A Turbo Stream returning the whole page. They scope to the frame.

AI collaboration

Allow AI for refactors and grade whether they ran rspec after.

The stack we put in front of them.

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

Rails 7+Ruby 3Active RecordPostgreSQLSidekiqSolid QueueSolid CacheHotwireTurboStimulusrspecrubocopBrakemanDevisePunditActiveStorage

Sample challenges

What a Rails 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 dashboard with 80 queries

Scenario

A Rails dashboard firing one query per row plus joins.

What you learn

Whether they fix with includes, preload or eager_load and explain the diff.

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 Rails that loops over associations. EasyEnv records prompts so you see whether the candidate read the query log after the LLM-suggested change.

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 Rails 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 Rails Developer, answered.

Yes. A Turbo + Stimulus app with broadcastable streams can be pre-loaded.

Yes. Rails 8 Solid Queue and Solid Cache can be wired without Sidekiq.

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 Rails Developer | Active Record · Hotwire | EasyEnv | EasyEnv

Hire Rails Developerswho actually ship Rails that scales with the team

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 Rails Developer is hard.

What we measure for a Rails Developer.

Active Record discipline

Service and model design

Background jobs

Migrations and indexes

Hotwire and Turbo

AI collaboration

The stack we put in front of them.

What a Rails Developer interview looks like.

The dashboard with 80 queries

Score the engineer, and how they work with AI.

Ready to hire a Rails Developer who ships?

Hiring a Rails Developer, answered.

Hire Rails Developerswho actually ship Rails that scales with the team

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 Rails Developer is hard.

What we measure for a Rails Developer.

Active Record discipline

Service and model design

Background jobs

Migrations and indexes

Hotwire and Turbo

AI collaboration

The stack we put in front of them.

What a Rails Developer interview looks like.

The dashboard with 80 queries

Score the engineer, and how they work with AI.

Ready to hire a Rails Developer who ships?

Hiring a Rails Developer, answered.

Hire Rails Developers
who actually ship Rails that scales with the team

Hire Rails Developers
who actually ship Rails that scales with the team