I help startups and growing businesses build scalable SaaS platforms using Ruby on Rails. From MVP to production-scale systems, I design and develop secure, high-performance web applications with clean architecture and long-term maintainability in mind. If you're building a subscription-based product or need to scale an existing Rails application, I can help you turn it into a stable revenue engine.

Ruby on Rails developer who is enthusiastic about writing clean efficient, and accessible code in a functional framework. Committed to the total development lifecycle, the maintenance of code quality and bug-free applications is of the utmost importance.

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

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.

🟢 Immediately Available ! 🏆 I'm a Top-Rated full-stack developer with 10 years of experience, proficient in a diverse array of technologies, frameworks and AI Workflow automation. now I specialize in *AI-powered automation, **LLM agents, and **voice-based AI systems* using tools like OpenAI, LangChain, Ollama, Deepgram, MCP Server and Vapi. I’ve delivered 4000+ Upwork hours with 100% client satisfaction helping startups, SaaS companies, and enterprise teams turn their product ideas into fast, stable, and scalable apps. 🔧 What I Can Build for You 🌟 ⁠Voice Interview or Sales Agents (Vapi + Deepgram + GPT) 🌟 Resume Screener / Job Match Bot using GPT-4 🌟 Research Assistant Agents (LangChain, RAG, FAISS) 🌟 ⁠Full-stack Web Apps using Next.js + Ruby on Rails 🌟 AI automation flows with OpenAI + Node.js + FastAPI 🛠️ Tech Stack Highlights 🌟 AI/LLM Tools:* OpenAI GPT-4, LangChain, Whisper, Deepgram, ElevenLabs, CrewAI, Ollama 🌟 Frontend:* React, Next.js, Vue, TypeScript, Redux, Tailwind 🌟 Backend:* Python, Ruby on Rails, Node.js, FastAPI, MongoDB, Postgres 🌟 DevOps:* Docker, AWS, Heroku, Vercel, CI/CD pipelines 🎁 Bonus Skills 🌟 ⁠⁠Blockchain / NFT smart contracts (Solidity) 🌟 ⁠Web scraping, vector search (FAISS), PDF tools 🌟 TDD/BDD, Stripe, Twilio, Airtable, Notion API 💡 Why Choose Me? ✅ Proven Track Record: Delivered 25+ Ruby on Rails applications. ✅ End-to-End Solutions: I handle every aspect of your project from design to deployment. ✅ Scalable & Secure: Build applications that grow with your business and protect your data. ✅ Client-Centric Approach: I prioritize clear communication, timely delivery, and exceeding expectations. ✅ Continuous Learning: Always updating my skills to stay ahead in the ever-evolving tech landscape. I can work solo or with your team, and I’m open to fixed-price or hourly work. My goal is simple: *deliver reliable, production-ready systems* with clean code and a great UX — fast. Let’s build your next AI agent or full-stack platform. Ready to get started?

With over a decade of hands-on experience in web development, I deliver comprehensive, end-to-end tested solutions with guaranteed support. I work with AI-agentic development workflows using Claude Code, Cursor, and AI agents for structured planning, implementation, and code review. I use skills-based commands and autonomous agents to plan features, manage implementation step-by-step, and maintain tight quality control through thorough human code review at every stage. This is not blind AI generation. It is disciplined, architect-led development with AI acting as a force multiplier. My core stack is Ruby on Rails (through Rails 8), leveraging Hotwire, Stimulus, and TailwindCSS for modern, server-driven user interfaces. I build scalable web applications and RESTful APIs using test-driven development (TDD). I integrate AI and ML services, including OpenAI and Claude. On the DevOps side, I work with AWS (EC2, Lambda, ECS, S3, SES, Route53, ACM, Beanstalk), Azure, and GCP. I also build serverless solutions using AWS Lambda for image processing and event-driven workflows. I follow Agile methodologies, including stand-ups, daily status updates, and professional remote and freelance work practices. Domain experience includes: 1. Learning Management and EdTech platforms 2. Event management applications 3. Healthcare applications (video calling, Stripe subscriptions) 4. CRM systems (software licensing, QuickBooks integrations) 5. Marketplaces (cart, payments) 6. Social media platforms (broadcasting, push notifications) 7. Generative AI applications. 8. Language translation applications

🔧 Custom SaaS Solutions | 🧠 AI-Integrated Platforms | 🌐 Scalable Web Applications I’m a Top Rated Plus Full Stack Developer with over 12 years of experience delivering custom web applications, AI-powered tools, and scalable backend systems. I specialize in building end-to-end software products using Ruby on Rails, React.js, and cutting-edge AI technologies. 🛠 Core Technologies: • Backend: Ruby on Rails, Node.js, PostgreSQL, Redis, Sidekiq • Frontend: React.js, Next.js, Tailwind CSS, TypeScript • AI/ML: GPT, OpenAI, LangChain, vector databases, recommendation systems • APIs & Integrations: Stripe, Shopify, Twilio, Zapier, Slack, Discord • Cloud & DevOps: AWS, Docker, CDK, Terraform, CI/CD workflows 💼 Industries I’ve Served: • Fintech: Transaction tracking, fraud detection, usage-based billing • E-commerce: Shopify automation, custom integrations, analytics dashboards • AI SaaS: Chatbots, AI writers, ML-powered CRMs • Enterprise Tools: Workflow automation, custom dashboards, internal tooling ✅ Why I Stand Out: • Top Rated Plus with a proven record of long-term clients and 100% satisfaction • Clean, maintainable code optimized for performance, security, and scale • AI-native thinking: I know how to turn ML models into usable products • Agile-friendly: Fast turnarounds, transparent communication, and milestone-based delivery Need a fast, reliable, and deeply experienced full stack developer to deliver real results? Let’s talk and see how I can bring your project to life.

Hello, I'm Ratnakar, a committed and independent full-time Ruby on Rails Developer on Upwork (Top Rated Plus). I am currently seeking long-term collaborations with clients. My experience includes working full-time with multiple global companies through Upwork from 2014. As a dedicated and Senior Ruby on Rails developer, my expertise encompasses a broad range of web development areas. This includes proficiency in front-end JavaScript and back-end Ruby, along with the development of comprehensive web platforms and APIs for mobile applications & front end applications, all utilizing the latest technologies. With more than 8 years in software development, I have successfully delivered a wide range of projects across various industries, consistently achieving client satisfaction and project objectives. Here are some key strengths that characterize my work: ✦ Ruby on Rails: MVC architecture, RESTful APIs, ActiveRecord, testing frameworks (RSpec) ✦ Database: PostgreSQL, MySQL, MongoDB ✦ Javascript, Jquery, React ✦ Hotwire Turbo, Stimulus ✦ Deployment: Heroku, AWS, Digital Ocean ✦ Docker, Portainer ✦ Sidekiq, Redis ✦ Shopify apps & extension development, Liquid Templates ✦ Third-party and RestFul API integration ✦ HTML, CSS ✦ Github, Bitbucket ✦ Jira, Trello, Pivotal, Clickup ✦ Sharetribe Marketplace Please feel free to reach out to me, and I would be delighted to discuss your requirements in detail.

Hi there👋 I would be glad to help you if you are looking for Ruby / Ruby on Rails developer for your project🚀 To give an idea of my skill set, I'm good at the following technologies: - Ruby, Ruby on Rails - HTML, CSS, Bootstrap, Tailwind CSS - JavaScript - jQuery - SQL (Postgresql, SQLite) - MySQL - AWS - Heroku - haml - slim - rails118n - state-machines - Elasticsearch - algoliasearch-rails - rails API development - serialisation - Rspec - minitest Workflow: - GIT, SVN(bitbucket/github/gitlab) - Jira, Trello, Asana - Slack, Teams, etc. Also, I have a background of learning Java, Python, C++, C# and passed a course from Cisco Networking Academy. You can see the certificate attached on my profile below⤵️ I'm up to long-term and full-time collaboration, so in case you need a skilled developer, feel free to reach out!

I am a professional web developer with over 12 years of experience. My current main framework for web development is Ruby on Rails. I started using this framework in 2013 and eventually fell in love with it. Rails has now become a part of my life. Using Ruby on Rails and other technologies, I can realize innovative ideas and turn them into products that add great value to users. I always look for new challenges and never stop improving myself in order to become an expert in the field of web development. My main areas of expertise: + Ruby on Rails + Ruby gems: Devise, Carrierwave, Paperclip, HAML, Capistrano, Resque, Sidekiq, Mongoid and more + TDD and Unit Testing with Cucumber, Rspec, Cabybara + Front-end technologies: AJAX, CSS3, HTML5, jQuery, ReactJS, React-Redux + Mobile-first responsive design: Bootstrap, Zurb Foundation + Relational and NoSQL databases: MySQL, PostgreSQL, MongoDB, Redis + Payment service integration: Paypal, Stripe, Checkout, Inpendium + Deployment platforms: Heroku, AWS, DigitalOcean, VPS + Amazon Web Services: CloudFront, Elastic Load Balancer, OpsWorks, ElasticCache, ElasticBeanstalk, etc + Social network and third-party integration: Google Maps, Google API, Facebook, Twitter + Multilingual web applications + Git workflow + Management tools: Trello, Pivotal Tracker, Redmine, JIRA.