We build apps. Any stack. Any speed.

Our core stack is Ruby on Rails for backend and React for frontend. These cover the majority of our projects. However, we also work with Python, Node.js, and Go when the project requires it. For rapid prototyping and MVPs, we use AI-assisted development tools, no-code platforms (like Bubble, Retool), and low-code solutions. We choose the technology based on your requirements, not our preferences.

With AI and no-code tools, we can deliver a functional prototype in as little as a few hours to a few days. A more complex MVP with custom backend logic typically takes 2-4 weeks. The timeline depends on scope - a landing page with payment integration is different from a marketplace with user matching. During our discovery call, we give you an honest timeline based on what you actually need.

A no-code MVP is built using platforms like Bubble or Retool - it is faster and cheaper to create, perfect for validating a market idea and gathering user feedback. A custom-built application (in Rails, React, etc.) gives you full control over performance, security, scalability, and features. We often recommend starting with an MVP to prove the concept, then rebuilding in custom code once the business model is validated. This saves you from investing months in an idea that might need pivoting.

Yes, in two ways. First, we use AI tools to accelerate our own development workflow - code generation, testing, documentation. This makes us faster without sacrificing quality. Second, we build AI-powered features into your application - chatbots, content generation, data analysis, workflow automation, LLM integrations. We work with OpenAI, Anthropic, and open-source models depending on your needs and budget.

It depends on the approach. A no-code MVP can start at $5K-$15K. A custom-built Rails application typically ranges from $25K-$150K+ depending on complexity. We work on a time-and-materials basis with two-week sprints, so you have full cost visibility and can adjust scope at any point. We provide a detailed estimate after our free discovery call.

Yes, we regularly take over existing codebases. We start with a code audit to understand the current state - architecture, test coverage, technical debt, security issues. Then we create a roadmap for stabilization and continued development. If the project is in Ruby on Rails, this is our strongest area. For other stacks, we evaluate on a case-by-case basis.

We help you transition from MVP to a production-grade application. If you started with no-code, we rebuild the core in Rails and React while preserving what worked. If you started with a minimal custom build, we extend and scale it. The advantage of working with us from the MVP stage is that we already understand your product, users, and business logic - no knowledge transfer needed.

USEO is based in Wroclaw, Poland (CET timezone). We have 6+ hours of daily overlap with US East Coast teams. We work with clients across the US, UK, Switzerland, Germany, and Australia. All communication is in English or German. Our Clutch rating is 5.0 with reviews spanning 13+ years of partnerships.