HIRE WITH US
Hire Ruby on Rails Developers
Kultrix Ruby on Rails developers build production-ready web applications and APIs with the speed that convention-over-configuration enables.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA

HIRE WITH US
Kultrix Ruby on Rails developers build production-ready web applications and APIs with the speed that convention-over-configuration enables.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA

EXPERTISE
WHAT WE DO
We build JSON APIs in Rails, RESTful endpoints with strong parameter validation, Pundit-based authorisation, serialisation with active_model_serializers, and OpenAPI documentation.
We build multi-tenant SaaS products with Rails, Stripe billing, Devise authentication, role-based access, background email queues with Sidekiq, and admin panels with ActiveAdmin.
We implement Turbo Drive, Turbo Frames, and Turbo Streams for dynamic, SPA-like interactivity within a Rails app, without writing a separate JavaScript frontend or maintaining two codebases.
We implement reliable background processing with Sidekiq, scheduled jobs, retry logic, dead-job queues, and Sidekiq Web UI monitoring, for emails, webhooks, and async tasks.
We upgrade legacy Rails applications from older versions, refactor tangled codebases, introduce test coverage, and migrate databases, preserving existing functionality throughout.
We eliminate N+1 queries using Bullet, optimise ActiveRecord eager loading, add database indexes for slow queries identified in production logs, and benchmark with rack-mini-profiler.
WHO THIS IS FOR
Whether you are a startup or enterprise, we have the right engagement for you.
Fast-track your MVP with senior talent. Launch on time and within budget.
Improve performance, UX, and features of your existing product with expert help.
Augment your team with senior specialists to accelerate feature delivery.
OUR APPROACH
Choose the cooperation format that best fits your business goals and development velocity.
Fast launch to test your idea and gather user feedback with minimal investment.
What's included
Timeline Typically 9-16 weeks
Complete cycle from initial strategy and design to final launch.
What's included
Timeline Typically 20-40 weeks
Scale your team with expert developers to accelerate development.
What's included
Timeline Flexible / Long-term
OUR HIRING PROCESS
Tell us about your project goals, timeline, and team needs. We'll set up a free consultation to dive deeper into your requirements.
Based on your project, we recommend the ideal team structure, engagement model, and technology approach - tailored to your goals and budget.
We handpick the best-fit professionals from our senior talent pool. You'll meet them, review their experience, and give the green light.
Your team onboards within 48 hours. We align on workflows, set up communication, and start delivering results from week one.
As your project evolves, we scale your team, add new specialists, or adjust scope - all within your existing partnership.
INDUSTRIES
Our Ruby Developer professionals build solutions across various sectors.
Data-driven commerce solutions that improve journeys, boost sales, and optimize operations.
Data-driven commerce solutions that improve journeys, increase sales, and optimize operations.
Reliable medical platforms that protect patient data, simplify workflows, and support clinical accuracy.
Product-driven platforms that enhance workflows, automate processes, and scale with your business.





start with us
Expert professionals ready to join your team and deliver results.
CASE STUDIES
Testimonials
What impressed us most was how Kultrix handled the full stack - frontend, backend, and mobile - with one cohesive team. Communication was clear, delivery was predictable, and the final product exceeded what we initially scoped.
Co-CEO
Kultrix built both our web platform and mobile app from scratch. Their team understood the complexity of our industrial workflows and translated them into clean, intuitive interfaces. We launched on time and our operators adopted the tools immediately.
Co-CEO
Kultrix handled everything for us - landing page, dashboard, mobile app, and even a Chrome extension. Having one team own the entire product surface meant everything felt connected and consistent. They shipped fast and the quality speaks for itself.
CEO, Ping Proxies
Kultrix has been our go-to partner for multiple projects - from marketing websites to full mobile applications and backend systems. They scale up when we need speed and maintain consistency across every project. Reliable, fast, and technically strong.
CEO, Volume Apps
Working with Kultrix on our mobile app and backend was seamless. They brought strong product thinking to every sprint, not just code. When priorities shifted, they adapted quickly without losing momentum. Exactly the kind of partner a product team needs.
Product Lead, Pelago
We needed a team that could handle mobile development, server infrastructure, and AI features all at once. Kultrix delivered on all three fronts. Our fitness platform went from concept to production in under four months with zero compromises on quality.
CEO, Fitblast

start with us
FAQ
Yes. Rails remains one of the most productive frameworks for building web applications and APIs. Its conventions eliminate entire categories of architectural decisions, its ecosystem is mature, and its tooling for developer experience - database migrations, test infrastructure, background jobs - is unmatched. GitHub, Shopify, and Basecamp still run on Rails at significant scale. For teams that prioritise developer velocity and convention, Rails is an excellent choice.
Standard placement is within 48 hours of contract signing. For developers with specific expertise - e-commerce (Solidus, Spree), healthcare data compliance, or complex multi-tenancy architectures - one week is typical. We maintain bench capacity for standard Rails API and SaaS development at all times.
Yes. Joining mature Rails codebases is routine for Kultrix developers. They review the codebase structure, Rails version, gem dependencies, and test coverage first - identifying the most important areas to address before writing new code. Most developers are contributing meaningfully within the first sprint.
Yes. Hotwire - comprising Turbo and Stimulus - is the modern Rails approach to frontend interactivity, and our developers use it fluently. Turbo Drive eliminates full page reloads, Turbo Frames update page sections independently, and Turbo Streams push real-time updates from the server. For applications where a full React frontend is not warranted, Hotwire delivers excellent interactivity with far less complexity.
Sidekiq with Redis is our default for Rails background processing - it is battle-tested, supports concurrent worker pools, provides a web UI for monitoring, and handles retry logic with configurable backoff strategies. For simpler cases where Redis infrastructure is not justified, GoodJob (PostgreSQL-backed) is a clean alternative we have strong experience with.
Yes. Rails version upgrades are a specialised skill. We follow the dual-boot upgrade approach - running the application against two Rails versions simultaneously during the upgrade, fixing deprecations iteratively, and verifying the full test suite passes on the new version before switching. This eliminates the risk of a big-bang upgrade and allows normal feature development to continue throughout.
We use Bullet to detect N+1 queries during development, review the PostgreSQL query plan with EXPLAIN ANALYZE for slow queries, add appropriate indexes, use counter caches for frequently-aggregated associations, and apply pagination with Pagy for large dataset queries. We treat database performance as an ongoing concern rather than a late-stage firefighting exercise.
Yes. RSpec is our default test framework for Rails. We write model specs for business logic, request specs for API endpoints, and system specs with Capybara for integration coverage. We target meaningful coverage on critical paths rather than chasing arbitrary percentage targets, and configure the test suite to run fast enough to be part of the standard development workflow.
Yes. Stripe is our primary payment integration for Rails applications - we implement Stripe Billing for subscriptions, Stripe Checkout for one-time payments, and Stripe Connect for marketplace payment flows. We handle webhook processing with idempotency keys, subscription lifecycle events, and reconciliation logic that keeps your billing data consistent with Stripe.
Our default Rails deployment stack is Kamal with Docker containers, deployed to a cloud VPS or managed container platform. For simpler deployments, Render and Railway provide excellent managed Rails hosting with minimal operational overhead. We configure health checks, zero-downtime deployments, and environment-specific secrets management as standard.
The minimum engagement is one month. This allows enough time to onboard properly, understand the codebase, and make a meaningful contribution. Most Ruby on Rails engagements run three to nine months - either building a product from scratch or working through a backlog of features and improvements on an existing application.
We offer monthly retainer and time-and-materials models. Retainer engagements lock in a fixed monthly allocation of developer hours with guaranteed availability and a lower effective hourly rate. T&M engagements are billed weekly against tracked hours with transparent reporting. Both models include a dedicated account manager.