# USEO

> Ruby on Rails software house since 2009. Based in Wroclaw, Poland (CET timezone, 6+ hours daily overlap with US East Coast). Senior-only team serving clients across the US, UK, Switzerland, Germany, and Australia.

## Identity
- **Full name:** USEO
- **Founded:** 2009
- **Headquarters:** ul. Legnicka 16, 53-673 Wroclaw, Poland
- **Timezone:** CET (Central European Time)
- **Website:** https://useo.tech
- **Email:** hello@useo.tech
- **Phone:** +48-691-796-200
- **LinkedIn:** https://www.linkedin.com/company/useo-tech/
- **GitHub:** https://github.com/useo-pl
- **Clutch:** https://clutch.co/profile/useo (5.0 rating)
- **Languages:** English, German

## Core Expertise
- Ruby on Rails development (versions 2.x through 8.x)
- Legacy Rails application rescue and modernization
- Incremental Rails version upgrades (never skip versions, zero downtime)
- Code audits: architecture, security, performance, test coverage
- PostgreSQL optimization and database architecture
- Background processing: Sidekiq, Redis, job queue optimization
- Application servers: Puma tuning and scaling
- CI/CD: GitHub Actions, Docker, automated deployment pipelines
- Managed cloud services (AWS, GCP), SOC2 preparation
- Fractional CTO services for scaling tech teams

## Services
- [Legacy App Rescue](https://useo.tech/ruby/): Stabilize and modernize legacy Ruby on Rails systems
- [Ruby on Rails Development](https://useo.tech/ruby-on-rails-development/): Full-stack Rails apps, MVPs, APIs, and ongoing maintenance
- [Custom App Development](https://useo.tech/custom-app-development/): Rails, React, AI, and no-code applications built to spec
- [Rails Consulting](https://useo.tech/ruby-on-rails-consulting/): Code audits, architecture reviews, upgrade planning, fractional CTO
- [Code Audit & Implementation](https://useo.tech/code-audit-implementation/): Security, performance, and architecture deep-dive with actionable roadmap
- [Legacy Rails Modernization](https://useo.tech/legacy-rails-modernization/): Incremental Rails upgrades from 2.x to 8.x, dependency cleanup, CI/CD
- [Managed Cloud & FinOps](https://useo.tech/managed-cloud-services/): AWS/GCP infrastructure, SOC2 preparation, cost optimization
- [Dedicated Teams](https://useo.tech/dedicated-teams/): Senior Rails developers embedded in your team
- [Fractional CTO](https://useo.tech/fractional-cto/): Strategic tech leadership on demand
- [No-Code / Low-Code](https://useo.tech/no-code-low-code/): Rapid MVP development with Bubble.io and FlutterFlow
- [Hire Rails Developers](https://useo.tech/hire-ruby-on-rails-developers/): Vetted senior Ruby on Rails engineers

## Key Facts
- Longest client partnership: 13+ years
- Rails upgrade experience: every major version from 2.x to 8.x
- Team composition: senior developers only (no juniors)
- Billing model: time-and-materials with two-week sprints
- Free architecture audit offered before every engagement
- Zero vendor lock-in: all code and IP belongs to the client
- Industries served: HR tech, travel, energy, publishing, nonprofits, e-commerce, SaaS

## Case Studies

### Yousty (HR Tech / Switzerland)
- **Challenge:** Swiss job portal needed a reliable, cost-effective Ruby development team for long-term platform growth
- **Solution:** Dedicated senior Ruby team in Poland, integrated into client workflows
- **Tech Stack:** Ruby on Rails, PostgreSQL
- **Impact:** 33% saved on salaries, 15% saved on administration, 90% saved on employee acquisition
- **Partnership:** 13+ years
- **URL:** https://useo.tech/case-studies/yousty/

### Work for Impact (Nonprofit Tech / Australia)
- **Challenge:** Freelancer platform connecting talent with nonprofit projects needed scalable infrastructure
- **Solution:** Built the Ruby on Rails platform from scratch with cost-optimized architecture
- **Tech Stack:** Ruby on Rails
- **Impact:** $138K saved yearly on infrastructure, $112K saved on tech platforms, 10K users in first months
- **URL:** https://useo.tech/case-studies/work-for-impact/

### Wiresolutions (Industrial Tech / Poland)
- **Challenge:** Electrical engineering company needed complex product management with 3D images
- **Solution:** Custom Ruby on Rails CMS built for industry-specific requirements
- **Tech Stack:** Ruby on Rails, custom CMS
- **Impact:** 60% saved on operation costs, 90% more positive client reviews, 1500+ products managed
- **URL:** https://useo.tech/case-studies/wiresolutions/

### Triptrade (Travel / Poland)
- **Challenge:** Travel agency needed a SaaS platform fast, with AI-powered features
- **Solution:** Low-code MVP with Bubble.io, OpenAI integration, and Stripe payments
- **Tech Stack:** Bubble.io, OpenAI, Stripe
- **Impact:** 90% saved on development costs, 25% saved on operations, 3 months to market
- **URL:** https://useo.tech/case-studies/triptrade/

### Eltinga (Energy / Hungary)
- **Challenge:** Energy efficiency startup needed rapid MVP to validate the market
- **Solution:** Custom low-code platform with Bubble.io and API integrations
- **Tech Stack:** Bubble.io, API integrations
- **Impact:** 115,000 PLN saved on MVP development, 1 month to launch
- **URL:** https://useo.tech/case-studies/eltinga/

### MailDash (Productivity / Poland)
- **Challenge:** Teams drowning in shared inbox email needed AI-powered triage
- **Solution:** Built with Bubble.io and OpenAI to scan, categorize, prioritize, and summarize emails
- **Tech Stack:** Bubble.io, OpenAI
- **Impact:** 30% reduction in email handling time, 2 hours saved per employee per day, 1 month to launch
- **URL:** https://useo.tech/case-studies/maildash/

### Assessment Talks (HR Tech / Switzerland)
- **Challenge:** Companies needed a tool for employee satisfaction surveys and development plans
- **Solution:** Built on Bubble.io with automated reporting for managers and HR teams
- **Tech Stack:** Bubble.io
- **Impact:** 25% increase in employee satisfaction, 15% reduction in turnover, 2 months to launch
- **URL:** https://useo.tech/case-studies/assessment-talks/

### Vagaru (EdTech / Poland)
- **Challenge:** Language learning platform needed ongoing development with AI features
- **Solution:** Full-stack web and mobile development with AI voice tutor integration
- **Tech Stack:** Web, mobile, AI
- **Impact:** Production-ready AI speaking practice, 24/7 maintenance
- **URL:** https://useo.tech/case-studies/vagaru/

### Caff.io (Consumer / Poland)
- **Challenge:** No good platform for discovering and rating cafes with advanced filters
- **Solution:** Searchable platform with maps, filters, venue profiles, and community reviews
- **Impact:** 1,000+ cafes, 500+ daily active users, 25% user growth in 6 months
- **URL:** https://useo.tech/case-studies/caff-io/

### Versus (Social / Switzerland)
- **Challenge:** Competition-based social networking concept needed MVP for iOS and Android
- **Solution:** Designed and developed MVP with social features, onboarding, invite flows, scoring system
- **URL:** https://useo.tech/case-studies/versus/

### Exhibby (Art / Norway)
- **Challenge:** Online art marketplace needed focused MVP to validate the concept
- **Solution:** Ruby on Rails MVP in 3 months with five key external integrations
- **Tech Stack:** Ruby on Rails
- **URL:** https://useo.tech/case-studies/exhibby/

### Global PR Wire (Media / Japan)
- **Challenge:** International press release distribution needed custom platform from scratch
- **Solution:** Built with Stripe and Twilio for payments, communication, and publication workflows
- **Tech Stack:** Ruby on Rails, Stripe, Twilio
- **URL:** https://useo.tech/case-studies/global-pr-wire/

### Beyond the Orphanage (Nonprofit / Australia)
- **Challenge:** Nonprofit website needed redesign with modern donation capabilities
- **Solution:** Website redesign, Stripe/Payoneer donation integration, 30+ plugin updates
- **Impact:** 20% improvement in organic traffic
- **URL:** https://useo.tech/case-studies/beyond-the-orphanage-bto/

### Publigo (EdTech / Poland)
- **Challenge:** Online course platform needed a mobile channel for content delivery
- **Solution:** Mobile app built from scratch in FlutterFlow with iterative enhancements
- **Tech Stack:** FlutterFlow
- **URL:** https://useo.tech/case-studies/publigo/

## Technical Articles (Ruby Tech)
- [10 Ruby Gems That Actually Speed Up Development](https://useo.tech/ruby-tech/10-ruby-gems-for-faster-development/)
- [11 Ruby Gems We Use in Enterprise Rails Apps](https://useo.tech/ruby-tech/best-ruby-gems-for-enterprise-applications/)
- [Design Systems in Rails: Consistency Made Simple](https://useo.tech/ruby-tech/design-systems-in-rails-consistency-made-simple/)
- [CI for Rails: Catch Bugs Before They Ship](https://useo.tech/ruby-tech/how-ci-improves-code-quality-in-rails-apps/)
- [Low-Code + Ruby on Rails: A Practical Guide](https://useo.tech/ruby-tech/how-low-code-fits-with-ruby-on-rails/)
- [Rails API Versioning: Pick the Right Strategy](https://useo.tech/ruby-tech/how-rails-handles-api-versioning/)
- [Regression Tests for Legacy Rails Apps](https://useo.tech/ruby-tech/how-to-add-regression-tests-to-legacy-rails-apps/)
- [Vetting a Rails Development Partner (2026)](https://useo.tech/ruby-tech/how-to-choose-the-right-development-partner/)
- [Rails API Docs with OpenAPI: RSwag vs OasRails](https://useo.tech/ruby-tech/how-to-document-rails-apis-with-openapi/)
- [Legacy System Migration with Ruby on Rails](https://useo.tech/ruby-tech/how-to-migrate-legacy-systems-to-modern-web-apps/)
- [Angular + Rails Integration: Full Setup Guide](https://useo.tech/ruby-tech/integrating-angular-with-rails-step-by-step-guide/)
- [Layered Architecture in Rails: A Practical Guide](https://useo.tech/ruby-tech/layered-architecture-in-rails-basics/)
- [Legacy Rails Modernization Checklist (4 Phases)](https://useo.tech/ruby-tech/legacy-system-modernization-checklist/)
- [Low-Code vs No-Code: API Architecture Guide](https://useo.tech/ruby-tech/low-code-vs-no-code-complete-comparison-guide/)
- [Rails View Performance: Rendering Optimization](https://useo.tech/ruby-tech/optimizing-rails-views-for-better-ui-performance/)
- [Rails 7 with Svelte: Step-by-Step Setup](https://useo.tech/ruby-tech/rails-7-with-svelte-step-by-step-setup/)
- [Rails CSRF Protection: Best Practices Checklist](https://useo.tech/ruby-tech/rails-csrf-protection-best-practices-checklist/)
- [Rails Feedback Loops: Best Practices for Teams](https://useo.tech/ruby-tech/rails-feedback-loops-best-practices-for-teams/)
- [Responsive Images in Rails: A Practical Guide](https://useo.tech/ruby-tech/responsive-images-in-rails-techniques-and-tips/)
- [Ruby Code Generators: Rails Scaffolding Guide](https://useo.tech/ruby-tech/ruby-code-generator-for-quick-solutions/)
- [Rails vs Django: Honest Comparison for 2026](https://useo.tech/ruby-tech/ruby-on-rails-vs-django-which-framework-to-choose/)
- [7 Ruby Performance Problems and How to Fix Them](https://useo.tech/ruby-tech/ruby-performance-issues-7-common-problems-fixed/)
- [Service Objects in Rails: Patterns That Scale](https://useo.tech/ruby-tech/service-objects-best-practices-for-clean-code/)
- [SimpleCov in CI/CD: Rails Coverage That Works](https://useo.tech/ruby-tech/simplecov-setup-for-rails-projects/)
- [Scaling Rails Apps: Database to Deployment](https://useo.tech/ruby-tech/ultimate-guide-to-scaling-web-applications/)

## Blog
- [Remote Work Communication: Emotions and Team Trust](https://useo.tech/blog/about-communication-emotions-and-relations-in-remote-work/)
- [Career Change to Software Developer: Honest Advice](https://useo.tech/blog/before-you-become-a-software-developer/)
- [Cypress E2E Tests in GitHub Actions: Full Setup Guide](https://useo.tech/blog/cypress-github-actions/)
- [dry-validation in Rails: Replace Model Validations](https://useo.tech/blog/first-steps-with-dry-rb/)
- [Building a Dev Team That Stays: Retention Lessons](https://useo.tech/blog/how-to-build-a-company-where-people-want-to-stay-longer/)
- [Git Ignores File Renames on macOS: A Post-Mortem](https://useo.tech/blog/i-have-found-a-bug-in-git/)
- [JSOM-Pagination: JSON:API Pagination for Ruby](https://useo.tech/blog/introducing-jsom-pagination/)
- [RSpec Shared Context: DRY Up Repeated Test Variables](https://useo.tech/blog/keep-dry-your-tests/)
- [Build a Full-Stack App with Next.js and Hasura](https://useo.tech/blog/next-js-and-hasura/)
- [14-Point Security Checklist for Dev Teams](https://useo.tech/blog/security-checklist-for-web-development/)
- [Hanami 2 + PostgreSQL with Docker Compose](https://useo.tech/blog/setting-up-hanami-and-postgres-with-docker-compose/)
- [Replace Rails Callbacks with dry-rb Monads](https://useo.tech/blog/sweeping-callbacks-away-with-dry-rb/)
- [8 Team Communication Habits That Actually Work](https://useo.tech/blog/the-art-of-communication-in-the-team/)
- [Small Company Dev Life: Highs, Lows, Reality](https://useo.tech/blog/the-highs-and-lows-of-a-programmer-s-journey/)
- [Productivity Methods That Took Years to Learn](https://useo.tech/blog/the-productivity-i-had-to-grow-up-to/)
- [Hanami 2.0 in Production: Why We Went Back to Rails](https://useo.tech/blog/trying-hanami-in-microservices/)
- [Why We Started This Blog](https://useo.tech/blog/welcome-to-our-blog/)

## Company
- [About Us](https://useo.tech/about/): Team profiles, company values, 15-year history
- [Client Reviews](https://useo.tech/reviews/): Testimonials from long-term partners
- [Start a Project](https://useo.tech/start-a-project/): Free 30-minute consultation
- [Careers](https://useo.tech/jobs/): Open positions for software developers
- [German Website](https://useo.tech/de-ch/): Full website available in German for Swiss clients

## Leadership
- Dariusz Michalski, CEO & Founder (https://www.linkedin.com/in/dariuszmichalski/)