Hire the Best Ruby Developers & Programmers

👋 Hello, I’m Sanjeev. With 13+ years of experience, I help startups and established companies build reliable, fast, and user-friendly CRMs, enterprise solutions, and e-commerce platforms. 💻 Front-End Expertise Angular, React, Vue & Ember.js → portals, dashboards, and CRMs ⚙️ Back-End Systems Laravel, Node.js, Ruby on Rails, PHP 🏢 CRM Solutions Workflow automation, Client portals, Custom CRMs 🛒 E-Commerce Solutions Custom builds for WordPress, Shopify, and Magento 🤖 Automation & Integrations Third-party integrations, Chatbots, Reporting systems ✨ Why Clients Choose Me ✅ 165+ successfully completed projects ✅ 13,500+ Upwork hours ✅ 100% Job Success ✅ Top Rated Plus Long-term trust, reliable updates, and transparent communication 💬 What Clients Say “Provided a good solution ahead of schedule.” “One of the best independent contractors I’ve ever dealt with—a superb communicator and coder.” “Knowledgeable Ember.js developer, consistently delivers.” 👉 Please get in touch with me or schedule a meeting to talk about your project if you're searching for a trustworthy developer to realize your ideas. #FullStackDeveloper #Angular #EmberJS #Laravel #NodeJS #RubyOnRails #CRMDevelopment #EcommerceDevelopment #Shopify #Magento #WordPress #AIAssistedDevelopment #WebDevelopment #EnterpriseSolutions #APIIntegration #Automation - Ember.js Developers & Programmers - CRM Developers - E-commerce Developers - Drupal Developers

Hello. I'm an AI engineer, full-stack iOS/Android/PHP/JavaScript/TypeScript/React/React Native developer and problem solver with more than 17 years of experience iOS/Android/PHP/JavaScript/TypeScript/React/React Native developer and problem solver with more than 17 years of experience. Specializing in MERN and LAMP stacks, artificial intelligence (AI). I embrace modern AI-powered development workflows using tools like 🤖 Claude Code, 🧠 Cursor and 🏄 Windsurf IDEs. What I do: 📱 Mobile apps, 🖥️ Desktop apps, 🌐 Websites, ⚙️ Web services, 👨🏻‍💻 Admin Backends, 🧩 API for them, 🤖 ChatGPT integrations. I embrace modern AI-powered development workflows using tools like 🧠 Cursor IDE and 🤖 Claude Code. Kinds of software I've created: 🛍️ Shopping & online stores, 🏃 Sports, 🎮 Games, 🧘 Medicine & well-being, ✈️ Travel, 💰 Bank systems, 📣 Ad networks, 🛡️ Insurance, 🛬 Landing pages. I have strong skills in the following programming languages: 📜 TypeScript, ☕ JavaScript, 🦅 Swift, 🎯 Objective-C, 🐘 PHP, 🐱 Kotlin, ☕ Java. Frameworks and technologies: 🦕 Deno & Node, ⚛️ React, ⚛️ React Native, 🤖 ChatGPT API, 🔮 Anthropic AI API, 🐻 Zustand, ⚛️ Electron, 🆁 Redux, 🆁 Redux Toolkit, 🐆 Nest js, 🅽 Next js, 🆅 Vue, 🐆 Fastify, 🥤 Fresh, 🅰 Apollo GraphQL Client and Server, 🔌 Relay, 🅼 MobX, 🌳 Koa, 🅴 Express js, 📈 GraphQL, 😎 Swagger, 💨 Tailwind, 🦅 SwiftUI, 🎥 Lottie Files, 🥤 Cocoa Touch, 🥥 Cocos2D, 🅻 Laravel, 🎵 Symfony, 🆈 YII and YII2, 🔥 CodeIgnitor, 🆉 Zend Framework, 📍 CoreLocation, 🎥 CoreAnimation, 🏠 Apple HomeKit, ❤️ Apple HealthKit, 💰 Superwall. Databases: 🍃 Mongo, 🐬 MySQL, 🪶 SQLite, 🍉 Watermelon DB, ⚡️ Supabase, 🔥 Firebase, 🐘 Postgres, 📄 TypeORM, ➡️ Doctrine, ⚪ DynamoDB/PartiQL, 🔴 Oracle, 🅲 CoreData, 🟣 Realm. Cloud Computing: 🐳 Docker, ☸️ Kubernetes, ☸️ Google Kubernetes Engine, 🌊 DigitalOcean Cloud, 🅷 Heroku, 🆁 Render, ☀️ Netlify, 🅰 Microsoft Azure, 🔺 AWS Lambda. I have developed over 20 iOS apps, 15 React Native apps, several Android apps, APIs for some of them, over 20 websites. I'm proficient in problem-solving and have solid track record of success in solving complex problems for teams that have struggled to do so on their own. I like to explore modern technologies, build amazing user interfaces, develop software of any complexity. I always strive to create apps and sites according to the best practices, thoroughly test them and provide the best user experience. It's important to me to write clean and readable source code which is easy to understand and maintain for any other developer.

I'm the CEO of NUS Technology, a software team of 75+ engineers based in Vietnam, working with international clients since 2013. Unlike typical dev shops that deliver isolated features, we design and build the core systems that power day-to-day operations: internal platforms, integrations, and automation workflows, and we stay accountable for outcomes, not just output. Over the past 12+ years we've worked closely with founders and operators (especially in Australia, the US, and Europe) on products where performance, maintainability, and business alignment truly matter. WHY CLIENTS CHOOSE US - Top Rated Agency on Upwork, 98%+ Job Success Score since 2013, 4.8/5.0 average rating - $10M+ in project value delivered - Long-term partnerships: many clients have worked with us for 5-10+ years - 75+ co-located engineers: 60+ web developers, 15+ mobile developers, plus QA, BAs, PMs, and designers WHAT WE DO BEST Operations platforms (our core) We design the central system that orchestrates bookings, payments, teams, hardware, and compliance into one seamless operation: software that bends to your process, not the other way around. We handle the integrations Zapier can't and SaaS avoids: deep data synchronization, legacy platforms, and compliance-grade audit trails where failure isn't an option. Web development - Ruby on Rails (deep expertise): production-grade apps, clean architecture, performance optimization, complex domains and high-traffic systems - Frontend: React, Next.js, Vue.js, TypeScript, Tailwind CSS - Node.js, PHP (Laravel, Symfony, WordPress), Python (Django, Flask) - RESTful and GraphQL APIs Mobile development - Native (Swift, Kotlin) and cross-platform (React Native, Flutter) for iOS and Android Cloud & DevOps - Scalable infrastructure on AWS (EC2, RDS, S3, Lambda, CloudFront), Google Cloud, Heroku - CI/CD (GitHub Actions, GitLab CI, CircleCI), Docker, monitoring and performance tuning - Cost-efficiency and scalability built in from early stages eCommerce - Shopify (custom themes, public/private apps, API integrations, migrations) - Spree Commerce, Saleor, and custom platforms when off-the-shelf doesn't fit HOW WE WORK - Outcome-driven: we focus on business results, not just shipping code - Ownership mindset: we act like a technical co-founder, not a contractor - Proactive: we surface technical debt and scaling bottlenecks before they escalate - Clear communication across time zones (we're GMT+7, with strong overlap for AU and partial US/EU) - Long-term thinking: we build systems that scale, not quick hacks that break later HOW YOU CAN WORK WITH US 1. Operations platform development: internal platforms, SaaS, workflow automation, complex integrations, replacing fragmented tools with a unified system 2. Dedicated engineering teams: backend, frontend, mobile, and QA engineers as an extended team, often for multiple years 3. Product development & MVPs: from idea to launch, fast but not fragile If you're looking for a team that thinks beyond code, challenges assumptions, and builds something that actually lasts, let's talk.

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.

Hi, I’m Zlata. I’m basically a typical American software developer... 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. 📩🤝

Senior Ruby on Rails Developer (12+ yrs) specializing in SaaS , eCommerce and edTech. I help startups and enterprises build scalable, secure, and high-performance applications with clean, maintainable code that drives growth. 👉 Ruby on Rails • Python • React • JavaScript • Web Design • API Development • Custom E-Commerce Solutions • Database Design and Architecture (PostgreSQL/MongoDB/Redis) • AI App Development & Integrations • AWS Services • SaaS Development • Custom Payment Gateways • Software Architecture & Scaling. ✅ How I Help My Clients ● Backend Development (Ruby on Rails) – Built secure, high-performance APIs for SaaS & fintech apps handling 10K+ users with 99.99% uptime. ● Frontend Development – Delivered responsive UIs with React, Next.js, TailwindCSS & Hotwire/Stimulus, improving engagement & conversions. ● E-Commerce Solutions – Customized Spree Commerce, Shopify, and Sharetribe stores that boosted sales and retention. ● DevOps & Cloud – Automated deployments via CI/CD (GitHub Actions, Docker, AWS, Heroku), cutting release cycles by 40–50%. ● System Architecture – Designed and scaled multi-tenant SaaS platforms, ensuring long-term reliability and growth. ● AI Automation & Model Training – Built AI-driven workflows, trained and integrated predictive models, and automated decision pipelines to improve efficiency, accuracy, and business outcomes. 🏆 Recent Highlights ✔️ Architected a Spree Commerce platform that increased conversions by 30%+. ✔️ Revamped a legacy Rails app with Hotwire + TailwindCSS, improving performance and UX. ✔️ Built a SaaS dashboard with role-based access, scaling to thousands of users. ✔️ Integrated AWS services for high-availability, API-driven applications. ✔️ Implemented GitHub Actions pipelines, reducing deployment time from hours to minutes. ✔️ Designed and integrated AI-powered automation and predictive models to streamline workflows and enable data-driven decision-making. 💼 Industries I Serve 📌 Ecommerce & Retail Tech – Spree, Shopify, Sharetribe customizations 📌 EdTech & Online Learning – Multi-tenant learning platforms 📌 Healthcare & MedTech – Secure, HIPAA-compliant Rails solutions 📌 PropTech & Real Estate – Data-driven dashboards & automation 📌 SaaS Platforms – Subscription-based, multi-role web applications 🌟 Why Clients Work With Me ✨ Clean, maintainable, and future-proof code ✨ Scalable architecture & reliable deployments ✨ Transparent communication & on-time delivery ✨ Long-term support & continuous improvements ⭐ Clients consistently rate my work 5★ for reliability, quality, and long-term value. 🚀 Let’s discuss how I can help turn your idea into a high-performance web application that scales with your business.