Prove it.
Then build it.
We build business-critical web apps in Ruby on Rails and React. You see the core working, for a small fixed price, first.
Not a do-everything agency. A specialist studio.
A deliberately narrow focus.
Business-critical web applications in Ruby on Rails and modern React, built by senior engineers, and wired into the systems your business already runs. We're not a do-everything agency. A specialist is hireable; a generalist is forgettable.
Rails & React
API or full-stack Hotwire when server-rendered speed wins; Inertia + React when the UX demands an SPA.
Custom web apps →Integration, any depth
From a quick Zapier or n8n automation to deep custom enterprise work, including Microsoft Dynamics.
Integration & automation →Proof before commitment
You see your product's core actually working, for a small, fixed price, before you commit to the full build.
Validation Sprint →The riskiest moment is the decision to start.
So we made it small.
Four stages. Each one earns the next, and the risk drops at every step.
Discovery call
An honest read on whether your project's viable, and whether we're the right team. If we're not, we'll say so.
Validation Sprint
Fixed scope, fixed price. A working MVP, a roadmap, and a fixed quote for the full build.
Full build
The complete app on the foundation we proved together, with a written 90-day guarantee.
Scale & support
Ongoing development, or a dedicated team you absorb in-house over time, with full handover.
We connect your app at the right depth.
Most shops sell only what they have. We're honest about the altitude, the lightest tool that solves it, custom only when the tools fall short.
No-code & low-code automation
Fast, cheap glue between SaaS apps. n8n when you want it self-hosted for data sovereignty.
Pre-built data integration
Standard CRM ↔ ERP sync, Salesforce with any Dynamics version, live in days.
AI & MCP integration modern
Connect your apps to AI on Claude, and build MCP servers so Claude and AI agents work safely with your own systems. Self-hosted models where data must stay in-house.
Custom integration our depth
Bespoke, test-driven Rails when the tools fall short, the deep enterprise end most boutiques avoid.
White-label integration
We become the invisible engine behind your product, shipped under your brand.
Everything a business-critical app actually needs, built in.
Not a menu of separate services. These are the parts real software depends on, and we build them as part of the whole.
Payments, any processor
Stripe, Adyen, PayPal, or a local gateway. We have shipped real payment systems, including a Swiss POS platform.
Event-based notifications
Email, SMS, push, and webhooks that fire on the events that matter, reliably, through background jobs.
APIs & documentation
Clean, documented APIs and docs sites your team, your customers, and your integration partners can actually use.
Support & helpdesk systems
Build the support tooling your operation runs on, or wire your app into the helpdesk you already use.
Workflow builders
Configurable, rules-driven workflows your team controls and changes without needing a developer each time.
Migration & modernization
Move off a legacy PHP or aging stack onto a modern foundation, safely and in stages.
Migration & modernization →AI that ships, not AI that just demos.
We build production-grade AI into business-critical web apps on top of Claude, with the evals, guardrails, and MCP-based access to your own systems that make it safe for real users. Proven on your data in a sprint, before you commit.
Explore AI solutions →Senior engineers, no handoffs
The people who build your product are the people you talk to. No relay, no offshore telephone game.
You see it working first
The smallest, cheapest step comes first, and produces real, running software you can judge us on.
Built to last
Test-driven, reviewed, maintainable Rails. Software meant to run for years, not rewritten when we leave.
Nearshore cost, EU timezone
Specialist-grade engineering at a price that makes the first step easy, in your working hours.
Chances are, we've built your hard part before.
Since 2007 we've shipped business-critical software across a lot of real-world domains. That matters for one reason: the business logic your project depends on is probably logic we've already modeled once. Less to discover, less to go wrong, a lower-risk build.
Business logic we've already solved
Industries we've built for
"fetosoft delivered exactly what we needed: fast, secure, and scalable. Their expertise in Rails helped us streamline development and launch ahead of schedule."
The questions every nervous buyer asks.
Can you just give me a price for the whole build?
We can, but it would be a padded guess with a big margin baked in to cover the unknowns, and you would pay for that guess. The Validation Sprint is how we both get a real number instead. After it, the full-build quote is fixed, because we have actually built the hard part.
Why start with a sprint instead of just building?
The sprint is building. It just builds the riskiest part first, so we de-risk before you commit to the full budget. It usually makes the whole project faster, because we are not discovering the hard problems three months in.
You are nearshore. How do I know the quality?
That is exactly what the sprint answers. In a few weeks you have working software in your hands, and you have worked directly with the engineers building it, in your timezone. You do not take quality on faith. You watch it.
What if we do not continue after the sprint?
That is a completely valid outcome, and it is the point. You keep the working MVP, the technical roadmap, and a clear-eyed decision, for a small fixed cost. No pressure to continue.
Do you only do Ruby on Rails?
Rails is our core, as an API or full-stack with Hotwire. We reach for React with Inertia when the experience needs an SPA, and we connect either into the systems you already run, including Microsoft Dynamics and complex ERPs.
Start by proving it.
A free discovery call gets you an honest read on your project, and, if it's a fit, a clear, low-risk first step.
Book a discovery call →