𝐈 𝐡𝐞𝐥𝐩 𝐒𝐚𝐚𝐒, 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞, 𝐅𝐢𝐧𝐭𝐞𝐜𝐡, 𝐚𝐧𝐝 𝐄𝐝𝐓𝐞𝐜𝐡 𝐟𝐨𝐮𝐧𝐝𝐞𝐫𝐬 𝐬𝐡𝐢𝐩 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐰𝐞𝐛 𝐚𝐩𝐩𝐬 𝐚𝐧𝐝 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐟𝐚𝐬𝐭, 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐭𝐡𝐞 𝐥𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐜𝐮𝐫𝐯𝐞 7+ years of full stack development in Ruby on Rails and the React / Next.js / Node.js stack, from first commit to production. Recent work: a multi-tenant SaaS platform with subscription billing, AI chatbots and AI voice agents that replaced manual scheduling for a healthcare/dental client entirely, and background job pipelines handling high-volume async work for an EdTech platform. 𝐖𝐡𝐞𝐫𝐞 𝐈 𝐚𝐝𝐝 𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐯𝐚𝐥𝐮𝐞: 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 (𝐑𝐮𝐛𝐲 𝐨𝐧 𝐑𝐚𝐢𝐥𝐬 & 𝐑𝐞𝐚𝐜𝐭/𝐍𝐞𝐱𝐭.𝐣𝐬/𝐍𝐨𝐝𝐞): Multi-tenant Rails architecture and modern React/Next.js + Node/Express web development, built to scale. I've taken over stalled production apps, killed N+1 queries, added the right indexes, and cut response times measurably. 𝐀𝐈 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧𝐬 & 𝐋𝐋𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: I connect OpenAI/LLM APIs into real AI-powered products: AI chatbots, AI voice agents, automated booking systems, and n8n/Zapier automation pipelines that remove manual busywork. Built end-to-end around what the business actually needs — not a wrapper around an API call. 𝐀𝐏𝐈 & 𝐓𝐡𝐢𝐫𝐝-𝐏𝐚𝐫𝐭𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Stripe billing (Fintech-ready), Twilio/Vonage, SendGrid, Google APIs, CRMs, All wired to work reliably in production, not just in a demo. 𝐓𝐞𝐜𝐡 𝐬𝐭𝐚𝐜𝐤: Ruby on Rails · React · Next.js · Node.js · Express · MongoDB · PostgreSQL · Sidekiq · Redis · OpenAI API · LLM Integrations · Stripe · n8n · Zapier · Docker · RSpec 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: 30–40 hrs/week, EU/US overlap, 0–4 hour response time. I flag risks early, write tested code, and give you honest tradeoffs, not just status updates. Tell me what you're building. I'll tell you honestly whether I'm the right fit.

Ruby on Rails developer with 15+ years of experience (working with Rails since 2009), specializing in building reliable, scalable, and secure web applications. I’m a fast learner who quickly adapts to evolving project needs, and I thrive in environments that require creative problem-solving. I’ve successfully delivered projects ranging from MVPs for startups to large-scale systems for established businesses. My focus is always on writing clean, maintainable code, optimizing performance, and ensuring smooth user experiences. I communicate clearly, meet deadlines consistently, and stay fully committed to delivering results that drive measurable impact. If you’re looking for a developer who can take ownership, solve complex challenges, and contribute effectively from day one — let’s work together.

I help startups and businesses build and scale marketplace platforms, SaaS products, and AI-powered applications using Ruby on Rails, React, and Sharetribe. With 7+ years of experience, I specialize in developing custom marketplaces (B2C, B2B, C2C) and extending Sharetribe to meet unique business needs. I focus on helping clients launch faster, scale reliably, and avoid costly rebuilds. What I can help you with: ==================== Build and customize Sharetribe marketplace platforms Develop scalable SaaS applications using Ruby on Rails and React Create custom features beyond Sharetribe limitations Payment integrations with Stripe, PayPal, and Braintree API integrations and third-party services AI and LLM integrations including LangChain and RAG workflows Performance optimization and scaling of existing applications Marketplace and Sharetribe expertise: =============================== Customizing Sharetribe Go and Sharetribe Flex Building multi-vendor marketplaces Implementing custom workflows, commissions, and booking systems Extending Sharetribe using custom backend services Migrating from Sharetribe to fully custom platforms when needed Real impact I deliver: ================= Built and scaled marketplace platforms with complex user flows and payments Helped clients launch MVPs quickly using Sharetribe Reduced development time by leveraging marketplace frameworks Delivered scalable systems that support long-term growth Tech stack: ========== Backend: Ruby on Rails, Python (FastAPI, Django) Frontend: React.js, Angular, JavaScript Databases: PostgreSQL, MySQL, MongoDB Cloud: AWS, Heroku, DigitalOcean Background jobs and caching: Redis, Sidekiq Marketplace: Sharetribe (Go and Flex) AI and LLM: LangChain, LlamaIndex, Llama 2, Mixtral Domain experience: ================ Marketplace, SaaS, E-commerce, Health, Fitness, EdTech, ERP Why clients work with me: ===================== Strong experience in marketplace architecture Ability to extend Sharetribe beyond standard limitations Focus on scalable and maintainable solutions Clear communication and fast response time If you are planning to build or scale a marketplace, I can help you choose the right approach and execute it efficiently.

Senior Shopify app engineer specializing in embedded Shopify apps, backend infrastructure, API integrations, subscriptions, and scalable ecommerce systems. I help Shopify brands and SaaS companies build reliable production grade applications that solve real operational and business problems from custom app development and checkout extensions to backend automation, subscriptions, payments, and third-party integrations. Over the years, I have worked extensively with: * Custom Shopify App Development * Shopify Plus ecosystems * Shopify Admin API (GraphQL & REST) * Embedded Apps & OAuth flows * Webhooks and event-driven systems * Checkout extensions and cart logic * Subscription systems (Recharge and custom builds) * Payment and billing integrations * ERP, inventory, and middleware integrations * Ruby on Rails backend systems * Scalable API architecture and automation workflows My focus is not just building features, but designing systems that are maintainable, scalable, and reliable in production. I work closely with clients to understand business requirements first, then architect solutions that improve operational efficiency, reduce manual workflows, and support long-term growth. What sets me apart: * Strong backend and systems-thinking approach * Clean, scalable architecture * Production reliability and performance focus * Experience handling complex integrations and business workflows * Clear communication and long-term technical ownership mindset Whether you need to build a Shopify app from scratch, optimize an existing system, integrate external services, or scale your backend infrastructure, I can help deliver solutions that are stable, maintainable, and aligned with your business goals.

Most software doesn't fail because the code is bad. It fails the day the person who understood it stops answering. I've spent eight years being the person who answers — $300,000+ earned on Upwork, Top Rated Plus, 100% Job Success, and client relationships measured in years. One client hired me in February 2021 to stabilize a system that was getting fragile. I was still there in April 2025, 2,224 hours later. Another kept me for eighteen months and wrote that I was "always there when we have company crisis." That's the pattern across most contracts here: someone had a product carrying real revenue and needed it to stop being a source of anxiety. What I build - SaaS platforms and web applications, end to end — Ruby on Rails is my deepest stack; I also build in Node.js, React, Next.js and Vue.js - AI and LLM integration — adding intelligent features, agents and automation to products people already use, where it removes real hours from someone's week rather than adding a chatbot nobody opens - MVPs for founders — a working, deployable product in weeks, architected so version two isn't a rewrite - Legacy rescue and modernization — old codebases, no tests, no docs, original developer long gone. Most developers refuse this work. It's what I'm known for. - Technical audits — performance, security, code quality, and an honest read on what's worth fixing versus rewriting How I work I report daily. Not weekly, not when asked — daily, in writing, including the days when progress was slow. One client put it as "always around, daily reporting on the progress he made. It was very easy and transparent." Another noted I respond in one to two hours. When an estimate is going to slip, you hear it from me before you have to ask. I'll also tell you when you're about to spend money on the wrong thing. If a rewrite isn't justified, I'll say so and lose the bigger contract. That's cost me revenue and earned me multi-year relationships — the better trade. Track record - Top Rated Plus, 100% Job Success Score - $300,000+ earned, 8,700+ hours, 25 projects, 5-star average - Three clients retained two years or longer - One client's CTO reviewed my work directly and confirmed the backend and frontend both held up Stack Ruby on Rails, Ruby · Node.js, Express · React.js, Next.js, Vue.js, TypeScript, JavaScript · OpenAI and LLM APIs, RAG, AI agents · PostgreSQL, MySQL, MongoDB · RSpec, Minitest, Capybara · Docker, Kubernetes, CI/CD, AWS, GCP, Heroku · Tailwind CSS Good fit if: you have a product that matters to your business — live or about to be — and you want an engineer who'll still be here in a year. Not a fit if: you're shopping for the lowest hourly rate, or you need a throwaway demo by Friday. I'm neither, and I'd rather say so now. Tell me what's breaking, or what you're trying to build. I'll tell you honestly whether I'm the right person and if I'm not, I usually know who is.

I have around 8+ years of hands-on experience and knowledge of application development and configuration in Ruby on Rails and Salesforce lightning: apex, Visual Force, LWC, trigger automation, batch, user, Salesforce admin, Rest and Soap API, Tooling API/Metadata, SOQL, SOSL, SQL, Javascript, CSS, Salesforce Mobile, Standard Reporting, salesforce integration, etc.

I am an experienced Ruby on Rails developer with over 7 years of expertise in the field. I am passionate about taking on new and challenging projects where I can apply my skills and gain valuable experience. I value honest and transparent communication. I always like to understand your needs and give advice to produce the best results possible. My Skills & Expertise: - Ruby on Rails - Ruby on Jets - Shopify App development(Public and Custom) - Shopify store migration - Shopify Scripts for the Shopify Plus store - Databases experience with PostgreSQL, MySQL, MongoDB - Third-party API integrations - TDD experience with RSpec - Experience in Github, Heroku, Bitbucket, Amazon AWS, Amazon S3, Digital Ocean

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

Senior Ruby on Rails developer (RoR) and full stack developer with 10+ years in web development, building, scaling, and maintaining production web applications. I work inside existing Rails codebases, ship new features, fix bugs, optimize performance, and harden billing and webhook logic - without breaking what already works. Part of the Roobykon Software team, where we have launched 150+ marketplaces and SaaS platforms in past 14+ years. I have helped scale products from MVP to high-traffic systems serving hundreds of thousands of users, cut page load and query times, and kept apps stable under growth. 🔹 Selected results and deliverables: ⬩ 10+ years and thousands hours of hands-on Ruby on Rails and full stack development ⬩ Contributed to 40+ production Rails and React applications, from MVP to scale ⬩ Scaled products to thousands of active users while keeping uptime stable ⬩ Cut page load and API response times by up to 60% through query and ActiveRecord optimization ⬩ Reduced background job processing time and backlog with Sidekiq and Redis tuning ⬩ Delivered MVPs in 8 to 12 weeks and shipped weekly feature releases on live apps ⬩ Integrated Stripe billing and webhooks processing hundreds of transactions per month ⬩ Maintained and upgraded legacy Rails apps to Rails 7 and Rails 8 with zero-downtime deploys 🔹 What you get working with me: ⬩ A web developer who reads the code carefully before changing it, communicates clearly, and works independently ⬩ Clean, well-structured, tested code with proper pull requests and CI ⬩ Async-first collaboration with daily overlap for US Eastern time zones (based in Europe) ⬩ Fast turnaround on feature development, bug fixes, and performance optimization 🔹 Core Ruby on Rails work: ⬩ Ruby on Rails development from MVP to scale, including Rails 7 and Rails 8 ⬩ Maintaining and improving existing Rails applications and legacy upgrades ⬩ Multi-tenant SaaS architecture, organizations, users, roles, subscriptions, usage records ⬩ ActiveRecord query optimization and database performance tuning ⬩ Background jobs and async processing with Sidekiq, ActiveJob, and Redis ⬩ Stripe, billing, subscriptions, and webhook integrations ⬩ REST and GraphQL API development and third-party API integrations ⬩ RSpec and Minitest, Hotwire (Turbo, Stimulus), Docker, CI debugging, tenant isolation and security 🔹 Full stack and frontend: ⬩ React developer work with React (ReactJS), React Native, Vue.js, Angular, Next.js, Redux, TypeScript ⬩ JavaScript (ES6+), HTML5, CSS3, Tailwind CSS, Bootstrap 5, jQuery, responsive web design ⬩ Node.js, Express.js, Python developer skills for services and integrations, plus PHP and Laravel maintenance when projects require it 🔹 AI and LLM features: LLM integrations with Anthropic Claude and OpenAI - streaming chat, tool-call-driven UI, RAG, vector search, prompt engineering. I also collaborate with data scientist and ML teams to ship AI-powered features 🔹 Databases, cloud and DevOps: ⬩ PostgreSQL, Redis, MySQL, MongoDB, Amazon Redshift, Elasticsearch, SQL ⬩ AWS (EC2, S3, Lambda, IAM, CloudWatch), Heroku, DigitalOcean, Git, CI/CD pipelines 🔹 Industries and platforms: ⬩ B2B and B2C SaaS, multi-vendor and rental marketplaces, Sharetribe and custom-built platforms ⬩ E-commerce, Shopify and Shopify app development, payment gateways and escrow systems, CRM, logistics, ERP and Odoo portal integrations, booking and scheduling, telemedicine, real estate, and blockchain-adjacent products On larger engagements I work as the technical lead alongside the project manager and in-house teams, and I have supported recruiter and hiring screens for Rails and full stack roles. I bring the same care whether I am a solo full stack developer or one engineer on a bigger crew. I work as a Ruby on Rails developer, Rails + React developer, senior Ruby on Rails engineer, Ruby on Rails architect, full stack SaaS developer, web application developer, and PHP or Java-stack-adjacent integrator - bridging backend, frontend, and infrastructure to deliver complete, reliable solutions. Whether you need to add features to a live Rails app, build a new SaaS product, fix production issues, optimize a slow system, or integrate Stripe, APIs, or AI features, I deliver high-quality solutions and transparent collaboration. 💬 Let's discuss your project and turn it into a stable, scalable product.

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.