🏆 Top-Rated Ruby on Rails Developer | Shopify App Developer with 10+ years of experience, 2500+ Upwork hours, and 40+ successful projects delivered. From AI-powered Shopify apps to Ruby on Rails backends integrated with large language models, I turn complex ideas into clean, scalable, production-ready systems. I focus on building scalable, maintainable systems with clean architecture and reliable performance. If you're looking to add AI capabilities to your product or build a powerful backend with Ruby on Rails, I can help you design and implement the right architecture. 🤝 Why Clients Choose Me ✅ 10+ years shipping production code — I've seen what works and what breaks ✅ Clean architecture focus — Your project won't become technical debt ✅ Proactive communication — You'll never wonder "what's happening?" ✅ Long-term thinking — I build for today and scale for tomorrow ✅ Business outcome focus — I care about your metrics, not just my code 🛒 Shopify App Development Specializing in modern Shopify apps and store solutions: ✅ Public Shopify App Development (Shopify App Store, OAuth, Billing API) ✅ Custom Shopify Apps for specific business workflows ✅ Shopify Store Development & Theme Customization ✅ AI-powered Shopify features (product descriptions, support automation) ✅ Shopify GraphQL & REST API integrations 💎 Ruby on Rails Web Development Full-cycle Ruby on Rails development for scalable platforms. ✅ SaaS platforms & custom web applications ✅ REST API & GraphQL development ✅ Database design (PostgreSQL, MySQL, MongoDB) ✅ Background jobs (Sidekiq, Redis) ✅ Payment integrations (Stripe, PayPal) 🤖 AI Development • AI chatbots & assistants (Claude / ChatGPT) • AI content generation • AI-powered search & recommendations • Automated workflows using LLMs • AI integrations inside SaaS products ⚙️ Deployment & Tools AWS EC2 • DigitalOcean • Heroku • Cloud66 GitHub • GitLab • Jira • Trello • Slack 💬 Need help building a Shopify app, Ruby on Rails platform, or AI-powered product? Send me a message and let's discuss how we can build your next AI-powered product.

I am a Full-Stack Ruby on Rails and React Developer with 8+ years of experience building scalable web applications, SaaS platforms, MVPs, custom business solutions, and Shopify apps. I specialize in developing robust backend systems with Ruby on Rails and creating modern, responsive frontend applications using React. From startup MVPs to enterprise-grade platforms, I help businesses build secure, high-performing, and user-friendly applications with clean architecture and scalable code. I have hands-on experience in: ------------------------------------ Full-stack web application development REST API and third-party integrations Shopify public & custom app development Payment gateway integrations AI-powered feature integrations SaaS platform development Admin dashboards and business automation systems Core Skills & Technologies: -------------------------------- Ruby on Rails, Ruby, RSpec React.js, JavaScript, jQuery Full-Stack Development Shopify App Development (Public & Custom Apps) HTML5, CSS3, Bootstrap, Tailwind CSS RESTful APIs, JSON, OAuth Integrations Stripe, PayPal, Braintree Payment Integrations PostgreSQL, MySQL, MongoDB Git, GitHub, Bitbucket Agile & SCRUM Methodologies What You Can Expect: -------------------------- End-to-end development ownership Clean, scalable, and maintainable code Responsive and modern UI development Reliable communication and timely delivery Performance-focused and secure solutions Long-term support and collaboration I enjoy turning ideas into powerful digital products and helping businesses scale with reliable technology solutions. Let’s connect and discuss how I can help with your project.

I’m a Senior Ruby on Rails Engineer and CTO-level System Architect with over 10 years of experience designing, scaling, and delivering complex web platforms end-to-end. I specialise in architecting secure, high-availability systems using Ruby on Rails as the core backend framework, applying domain-driven design, modular service boundaries, caching strategies, and event-driven workflows to ensure long-term maintainability and performance. I’ve built everything from monoliths with clean domain separation to microservice ecosystems connected through message queues and API gateways. My frontend engineering experience includes Hotwire (Turbo & Stimulus) for real-time Rails-native interactivity and React.js for component-driven UIs where scalability and state management matter. On the data side, I have deep expertise in PostgreSQL, designing normalised schemas, advanced indexing, partitioning strategies, and query optimisation to support high-volume transactions. I frequently leverage Redis for distributed caching, job orchestration, rate limiting, and session management. As a system architect, I design and deploy infrastructure across AWS, GCP, and Azure, using services like EC2, ECS/EKS, S3, Load Balancers, Cloud SQL/RDS, Lambdas, and Cloud Functions to build resilient, cost-efficient systems. I implement fully automated CI/CD pipelines using GitHub Actions, GitLab CI, or CircleCI to enforce code quality, testing, security scans, and blue/green or rolling deployments. I rely on RSpec, Minitest, Capybara, and Cypress to maintain strict TDD/BDD practices, ensuring stable, predictable releases. My architecture approach prioritises observability, structured logging, distributed tracing, metrics dashboards, and automated alerts, so systems remain transparent and easy to operate at scale. Having worked as a CTO and engineering lead, I guide teams through architecture decisions, code reviews, cloud infrastructure planning, sprint processes, and long-term technical strategy. 🔥 Core Technical Expertise 💡Backend: Ruby, Ruby on Rails, Sinatra, Sidekiq, GraphQL, REST APIs 💡Frontend: HTML, CSS, Hotwire (Turbo & Stimulus), React.js, ES6, modular UI design, JS (ES6/CoffeeScript) 💡Databases: PostgreSQL (expert), MySQL, Redis, MongoDB 💡Cloud & DevOps: AWS (EC2, S3, RDS, Lambda), GCP, Azure, Docker, Kubernetes, Heroku, Digital Ocean 💡CI/CD: GitHub Actions, GitLab CI, CircleCI, automated deployments 💡Architecture: Microservices, event-driven systems, domain-driven design, caching, performance tuning 💡Testing: RSpec, Minitest, Capybara, Cypress, full TDD/BDD workflows 🔥 Other: 💡Version control system: Git 💡OS: Linux, Mac 💡Task managers: Basecamp, Trello, Asana, Pivotal, JIRA, etc. 💡Chats/Calls: Discord, Stride, Slack, Zoom, or any others. If you’re looking for a senior engineer and architect who understands not just how to write code, but how to design entire systems that last, let’s connect. I bring strong engineering leadership, clear communication, and a product-oriented mindset that aligns technical decisions with business goals.

I am a Senior Rails & DevOps Engineer with 15+ years of experience specialized in stabilizing, scaling, and modernizing complex web applications. When product owners and startup founders face messy codebases, performance bottlenecks, or tricky integrations, I step in to fix the root causes—not just apply temporary patches. I work 100% independently. No outsourcing, no middle-men. You get direct senior-level expertise. Here are the specific problems I solve for my clients: API / System Integration • Need to connect external services seamlessly? I integrate complex REST/OAuth2 APIs and third-party systems including Stripe, Mailchimp, FlightStats, Shopify, Simpro, Open-Meteo, Alpha Vantage, Google/Outlook Calendars, and Sendy. API Development • Need a custom, high-performance API? I build clean, well-structured, and secure APIs from scratch, thoroughly tested using Postman and curl, tailored for mobile apps or frontend consumption. Custom Shopify App Development • Need a tailored solution for your Shopify store? I build robust, non-embedded Shopify apps using Ruby on Rails to automate complex workflows and sync critical store data in real-time, including: - Products & Inventory: Real-time stock sync and automated catalog updates. - Orders & Fulfillment: Streamlined order processing, tracking updates, and custom fulfillment workflows. - Customers & Metafields: Advanced customer data management and extended store capabilities using custom metafields. - Automated PDF Generation: On-the-fly generation of custom invoices, packing slips, receipts, and downloadable business documents based on real-time store events. Performance & Scaling (Sidekiq, Redis, Queries) • Background jobs failing? Memory leaks? I analyze production logs, queue behavior, and server configs to eliminate bottlenecks and slash your server costs. Legacy Rails Modernization (v3.x to 7.x) • Stuck on an old Rails version? I dockerize your setup, resolve dependency hell, and modernize your stack for local development and production. Infrastructure & Cloud Migrations (Heroku / DigitalOcean / AWS) • Full server provisioning, Nginx configuration, SSL setup, Docker containerization, and automated deployment pipelines (Kamal, CI/CD). Bulletproof Stripe Integrations • Implementation and debugging of complex payment flows: Subscriptions, Webhooks, Payment Intents, and custom invoice handling. Modern Frontend & Fullstack Capabilities • Need UI modernization alongside backend fixes? I build fast, responsive, and interactive interfaces using Tailwind CSS, Vue.js, and Hotwire/Turbo, keeping your stack clean and efficient. Search Optimization • Transitioning slow database queries into lightning-fast searches using Elasticsearch and smart caching strategies. Let’s get your system stabilized. Reach out and briefly share your current tech stack and the challenges you're facing—I’ll take a look and let you know how we can fix it. Best regards, Sugi

🥇 Top 1% - Upwork Ruby on Rails & AI Solutions ✅ Expert in AI LLM OpenAI GPT ✅ Senior developer (10+ years experience) ✅ 50 completed projects & 11000 hours on UpWork! 🇺🇸 Work in PST/PDT time zone. Hi, 👋 I'm Alex! I've worked with dozens of Ruby on Rails applications, from small startups to huge production apps with millions of users. Included: SAAS, IAAS, marketplace, search engines etc. Also, I am an OSS contributor, maintaining RubyAI, kredis, cookies_eu, and other gems in the Ruby ecosystem. - Ruby and Ruby on Rails - JavaScript, React - Stimulus, Turbo, Hotwired - HTML, HAML, and HTML5 - PostgreSQL and MySQL for backend databases - Version control with Git and GitHub - SAAS, IAAS, eCommerce applications. - UX/design, SEO - DevOps (Hetzner, DigitalOcean etc)

Are you looking for a highly skilled Ruby on Rails developer who can build, scale, and optimize your web applications? I help businesses turn their ideas into powerful, secure, and high-performance software solutions — on time and within budget. 💡 What I Do Best ✅ Full-Stack Development — Ruby on Rails, RESTful APIs ✅ Frontend Expertise — Reactjs, Vuejs, Nextjs, CoffeeScript, Hotwire Stimulus ✅ Database & Storage — PostgreSQL, MySQL, MongoDB, SQLite, Redis ✅ Automated Testing — RSpec, Cucumber, Capybara ✅ Search Optimization — ElasticSearch Integration ✅ Payment Systems — Stripe, PayPal, Square ✅ Cloud & Deployment — AWS (S3, EC2, RDS), Docker, Heroku, DigitalOcean ✅ API Development & Integration — RESTful API, Third-Party Services 🔹 Why Clients Hire Me 8+ years of experience building high-quality Ruby on Rails applications Proven track record of delivering scalable, optimized solutions Excellent at problem-solving and debugging complex systems Strong communication, transparency, and on-time delivery 📌 Tools & Platforms I Work With Project Management: Jira, Trello, Monday, Pivotal Tracker Cloud & DevOps: AWS, Docker, DigitalOcean, Heroku Analytics & Tracking: Google Analytics Let's dive into a discussion,reach out and let's make I.T happen!"

🚀 Ruby on Rails Expert with 8+ Years of Experience Are you looking for a seasoned Ruby on Rails developer to bring your web application to life? Look no further! With over 8 years of hands-on experience in the Ruby on Rails ecosystem, I'm ready to help you turn your ideas into scalable, robust, and efficient web applications. 🚀 You have an idea for your MVP app ? Let's talk and give me trial for help you to build it. 🐛 Do you a bug and need to fixed ASAP ? Let me take care of it, and if I can't resolve it, there will be NO CHARGE. 🕹️ Need extra main player in your team to adding new features ? I'm here to help you. Front End : - Stimulus JS - JQuery - HTML / HAML - CSS, - Twitter Bootstrap - Hotwire - Webpacker - Importmap Back End : Ruby on Rails (Version 3 to 7) Ruby on Rails API (Version 3 to 7) Database : PostgreSQL, MongoDB, MySQL, Firebase

Hi, I’m Zlata. I’m basically a typical American Software Engineer... just living in Ukraine now. And I always work in the EST timezone. I’ll write everything in any tech stack you have 😄 I’m a Software Engineer with 8+ years of experience as a Ruby on Rails developer, React developer, Node.js developer, Python developer, and .NET developer. I work with Ruby on Rails, React, Node.js, Python, .NET, PostgreSQL, Docker, AWS, JavaScript, TypeScript, API development, API integration, and SaaS software development. I help companies build and improve SaaS platforms, ERP systems, CRM tools, dashboards, marketplaces, internal systems, API products, and complex web applications using Ruby on Rails, React, Node.js, Python, and .NET. My focus is clean product logic, stable delivery, scalable architecture, and software that stays easy to maintain as the business grows. 📊 My Achievements in Numbers: 🔶 Ruby on Rails Developer for a Construction Application Platform ▪ Helped build a Ruby on Rails + React platform for managing construction applications, reviews, documents, and stakeholder workflows. ▪ Reduced application review time by 42%. ▪ Supported 18,500+ construction applications processed in the first year. ▪ Helped the product reach $1.4M ARR within 14 months. ▪ Worked with Ruby on Rails, React, PostgreSQL, Docker, AWS, S3, and API integration. 🔶 React Developer for a Construction Materials ERP SaaS ▪ Helped improve a complex ERP SaaS platform for concrete, aggregates, and asphalt producers. ▪ Improved sales, pricing, and operational workflows through better product logic and scalable software architecture. ▪ 98% of demo users became clients after product improvements. ▪ 91% of users rated the interface as clear and intuitive. ▪ The product later raised $3.4M. ▪ Focused on React, Ruby on Rails, SaaS workflows, API development, and complex web application structure. 🔶 Node.js Developer for an Aviation Maintenance SaaS ▪ Helped improve a complex aviation maintenance SaaS product used by field teams. ▪ 96% of demo users became clients after the product improvements. ▪ 97% of field users adopted the product after the first try. ▪ Reduced user errors by 41% and made onboarding 62% faster. ▪ Supported product logic, API integration, dashboards, and connected SaaS workflows using Node.js, React, Ruby on Rails, and API development. 🔶 Python Developer for an AI Healthcare SaaS ▪ Supported an AI-powered healthcare platform that grew from a chatbot into multiple AI agents for clinics and hospitals. ▪ The product raised $20M+. ▪ Helped support workflows that increased patient visits by 31%. ▪ Helped reduce call abandonment by 98%. ▪ Worked with Python, API integration, automation workflows, AI-related product logic, and scalable SaaS architecture. 🔶 .NET Developer for a Utility Billing Platform ▪ Helped improve utility billing workflows for a SaaS platform processing complex customer, billing, and reporting data. ▪ Helped process $14M+ in utility bills within 6 months. ▪ Reduced billing cycle time from 9 days to 1.5 days. ▪ Supported 96% client retention through better product stability and workflow clarity. ▪ Worked with .NET, React, API development, reporting logic, SaaS architecture, and reliable software delivery. Why should you hire me as a Software Engineer? ▪ 8+ years of experience with Ruby on Rails, React, Node.js, Python, .NET, JavaScript, TypeScript, PostgreSQL, API development, API integration, and SaaS software development. ▪ 120+ successful projects delivered across B2B SaaS, ERP, CRM, healthcare, construction, logistics, fintech, aviation, and internal business platforms. ▪ Strong experience with Ruby on Rails, React, Node.js, Python, and .NET for SaaS products, dashboards, admin panels, API-first platforms, integrations, automation, AI features, and enterprise systems. ▪ I use Claude, Cursor, GitHub Copilot, and ChatGPT to speed up research, debugging, refactoring, and delivery. ▪ I work well with founders, CTOs, product managers, and teams that need clear communication across Ruby on Rails, React, Node.js, Python, and .NET products. What I can help you with: ✔️ Build or improve Ruby on Rails SaaS products ✔️ Create React dashboards, portals, admin panels, and SaaS interfaces ✔️ Build Node.js services and API integrations ✔️ Support Python automation, data workflows, and product logic ✔️ Work with .NET systems and connected software platforms ✔️ Build API-first products with Ruby on Rails, React, Node.js, Python, .NET, PostgreSQL, Docker, and AWS ✔️ Improve performance, stability, and maintainability of existing Ruby on Rails, React, Node.js, Python, and .NET applications ✔️ Support SaaS, ERP, CRM, fintech, healthcare, logistics, construction, and internal tools Need help with Ruby on Rails, React, Node.js, Python, .NET, API development, or SaaS development? Message me and let’s discuss your product. 📩🤝

I'm a Ruby on Rails developer and full stack developer focused on SaaS and FinTech products. Day to day that's Ruby on Rails and React.js (Next.js, TypeScript) on PostgreSQL, deployed on AWS with Docker when the app needs it. 6+ years building production web applications — Top Rated Plus, 100% Job Success, 6,100+ Upwork hours, 85+ jobs. Most contracts run 1–4 years on one codebase. Available 30+ hours a week. Two years at SmartZip on their Rails + React lead-gen SaaS. Since then: B2B SaaS features, Stripe billing, GraphQL and REST APIs, Elasticsearch for search, Heroku-to-AWS migrations, Rails version upgrades. Frontend is React and Next.js; backend is Rails, Sidekiq, RSpec, and PostgreSQL done properly. I've also been adding AI features to live products — LLM API integration, chat interfaces and workflow automation. A long-term client, Olivier: "30+ eLearning apps, nearly 4 million plays — proactive, doesn't need hand-holding." Hiring a Ruby on Rails developer for ongoing SaaS work, full stack Rails + React, FinTech/Stripe, or a legacy app that needs a Rails upgrade or cloud migration? Send your repo or roadmap, I'll reply with an honest take on fit.

Looking for a Ruby on Rails expert who delivers reliable, high-performance web applications? With 9+ years of hands-on experience, I specialize in building scalable, secure, and business-driven web solutions. I don’t just write code—I focus on understanding your product vision and turning it into a robust application that delivers real value. Here’s What I Can Do for You: Ruby on Rails Mastery: I have deep expertise in Ruby on Rails, from clean and maintainable backend architecture to seamless frontend integration. I’m comfortable handling everything—from database design and API development to complex business logic and third-party integrations. Modern Tech Stack: I work with today’s most in-demand technologies, including PostgreSQL, Redis, Sidekiq, Hotwire (Turbo & Stimulus), React, REST & GraphQL APIs, and cloud platforms like AWS. I also have strong experience with Docker, background jobs, and service-oriented architectures. Technical Leadership & Architecture: I’ve led teams, reviewed system designs, and defined technical strategies aligned with best practices. I enjoy architecting applications that are scalable, secure, and easy to maintain as your product grows. Code Quality & Mentorship: Clean code matters. I actively follow best practices, write testable code, and conduct detailed code reviews. I also enjoy mentoring junior developers and improving overall team productivity and code standards. Performance & Scalability: I help applications run faster by optimizing database queries, implementing caching strategies, improving background processing, and identifying performance bottlenecks early. Security-Focused Development: Security is never an afterthought. I follow strong practices for authentication, authorization, data protection, and compliance, while staying updated with the latest security standards and vulnerabilities. CI/CD & DevOps Practices: I have hands-on experience setting up CI/CD pipelines, automated testing, and smooth deployment workflows to ensure faster releases and reliable production environments. Why Work With Me? Client-First Mindset: I believe in clear communication, transparency, and collaboration. I work closely with clients to understand their goals, deliver on time, and stay within budget. Always Learning, Always Improving: Technology evolves fast—and so do I. I continuously upgrade my skills to bring modern, efficient, and future-ready solutions to your projects. 🚀 Let’s build something great together. If you’re looking for a dependable Ruby on Rails expert who understands both technology and business, I’d love to work on your next idea.