01Owns
Working with the conventions
Keeps the app close to Rails defaults, so routes, controllers and models stay predictable for whoever joins next, and departs from convention only with a stated reason.
Hire · Backend
Hire Ruby on Rails Developers
Senior Rails developers who join your team to work in a mature Rails application: models, controllers, Hotwire views, Sidekiq jobs and the upgrades that keep it current. Each one has trimmed a slow Active Record page and planned a Rails version bump in a paid exercise before shortlisting.
Paid Rails exercise on a working app
Senior and lead levels only
Follows your conventions and review
On your team
What a Ruby on Rails developer owns on your team.
02Owns
Active Record and the database
Writes scopes and associations that load efficiently with includes or preload, adds the indexes queries need and enforces integrity with database constraints as well as validations.
03Owns
Hotwire interfaces
Builds interactive pages with Turbo Frames, Turbo Streams and small Stimulus controllers instead of reaching for a separate JavaScript application.
04Owns
Sidekiq jobs
Moves slow work into Sidekiq with idempotent jobs, sensible retry settings and queues separated by priority.
05Owns
Staying current
Upgrades Rails and Ruby versions in planned steps, using deprecation output and dual-booting where it reduces risk.
Convention is the asset you are hiring to protect
A Rails app stays cheap to change as long as it stays recognisably Rails. The expensive codebases are those where each developer brought a different pattern: service objects here, fat callbacks there, a half-finished JavaScript framework in one corner. When you interview, ask candidates where they would put a new business process and why; you want an answer that respects what is already there.
Strong Rails engineers also talk about the database, not only Ruby. Constraints, indexes and eager loading come up naturally when they describe their work.
Vetting
Skills we test before a Ruby on Rails developer joins.
01Tested
Active Record fluency
Spots N+1 queries with Bullet or log review, knows the difference between includes, preload and eager_load, and uses counter caches where they help.
02Tested
Callbacks and service objects
Keeps callbacks for persistence concerns only and moves business processes into plain Ruby objects that are easy to test.
03Tested
Turbo and Stimulus
Understands frame navigation, stream broadcasts over Action Cable and when a page needs a full reload instead.
04Tested
Background job design
Passes record IDs, not objects, to jobs, handles retries and dead jobs, and watches queue latency.
05Tested
Upgrade mechanics
Reads release notes, runs the app update task, handles autoloader changes and fixes deprecations version by version.
06Tested
Testing culture
RSpec or Minitest, request and system specs, factories that stay small and a suite fast enough that people run it.
Work sample
How the Ruby on Rails developer work sample runs.
- 01Step 1
Speed up an index page
The candidate gets a Rails page that renders slowly due to N+1 queries in partials and fixes it with eager loading and, where sensible, fragment caching.
- 02Step 2
Turn a form into Turbo
They convert a full-page form flow into Turbo Frames with inline validation errors and a request spec. Their hours are paid.
- 03Step 3
Make a Sidekiq job safe
A job charges a card twice when retried; they make it idempotent and show how a retry now behaves.
- 04Step 4
Outline an upgrade
They talk a non-developer through the steps for taking the sample app up one minor Rails version, in a brief call.
Our Rails exercise in brief
The paid exercise works on a small but real Rails app: a slow index page full of N+1 queries, a form to move onto Turbo Frames and a Sidekiq job that is unsafe to retry. Together those cover the day-to-day of most Rails teams, and the upgrade conversation shows whether they can plan beyond a single ticket.
Levels
Ruby on Rails Developers: what changes at each level.
01Level 1
Senior
Ships features through models, controllers, views and jobs in your existing app and reviews peers’ pull requests.
02Level 2
Lead
Decides where business logic lives, how Hotwire is used, testing standards and the cadence of framework upgrades.
03Level 3
Principal Rails engineer
Leads multi-version upgrades, splits engines or services from a large monolith and resolves database scaling limits.
Deciding on senior, lead or principal
If your app follows Rails conventions and upgrades are current, a senior developer adds pace straight away. When patterns have fragmented or tests are slow and flaky, a lead can restore order. A principal engineer suits apps several major versions behind, or monoliths that have reached database or deployment limits.
Other options
When to hire someone other than a Ruby on Rails developer.
01Consider
Your team works in PHP
If your applications and people are already on PHP, a Laravel developer gives similar productivity without a language switch.
Open register02Consider
A JavaScript-heavy front end
If the product is a rich single-page app with Rails as a thin API, a React developer may matter more.
Open register03Consider
An online store
For storefronts where checkout and catalogue are the core, a Shopify developer is often quicker than building in Rails.
Open registerThe opening month on a Rails team
Ship a small fix through your pipeline in week one, ideally one touching a view and a model. Then hand over a feature area with its jobs and specs.
Ask the new developer to note every deprecation warning in the logs and test output. The list doubles as an upgrade plan, and it is far easier to compile early than in the middle of a version jump.
FAQ
Questions to resolve before the build.
01Can a Rails developer upgrade an old Rails app?
Yes. Upgrades are a core part of the vetting. The usual approach is one minor version at a time, fixing deprecations at each stage, often dual-booting the next version in CI before switching over.
02Do your Rails developers use Hotwire or React?
Both appear in practice. We test Hotwire because it is the Rails default for new apps, and can match engineers experienced with React front ends if your app uses one.
03Is Sidekiq experience required?
For most production Rails apps it is relevant, as Sidekiq is the most common job runner. Engineers familiar with Solid Queue or GoodJob can be matched if that is your setup.
Works alongside
Roles a Ruby on Rails developer works best alongside.
01Pair with
UI/UX designers
Hotwire makes server-rendered UI the default, so designers and Rails engineers work closely on states and partials.
Open register02Pair with
DevOps engineers
For Puma tuning, Sidekiq scaling, Redis and deploys with Kamal or your platform of choice.
Open register03Pair with
QA engineers
To extend system tests and regression coverage before larger Rails upgrades.
Open registerProduct delivery
Need the whole product built instead?
Primary sources
References behind this page
Dated official documentation, standards, and research that support the factual claims on this page.
- 01Rails Guides: Active Record Query Interface
Official guide to querying, eager loading and scopes in Active Record.
- 02Rails Guides: Upgrading Ruby on Rails
Official notes for moving an application between Rails versions.
How to read this page
Scope, cost and timeline figures are planning guidance until confirmed in a written proposal. Diagrams and screens are illustrations, not client deliverables, and source-code rights and handover follow the signed agreement. See the delivery process and the full disclaimer.
Next decision
Turn the brief into an accepted product scope.
Define outcomes, constraints, evidence, rights and handover before delivery begins.
Commercial rights, repositories, environments, documentation, acceptance and handover remain contract-defined.