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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. Specializing in MERN and LAMP stacks, artificial intelligence (AI) and AI agents. I embrace modern AI-powered development workflows using tools like 🤖 Claude Code, 🧠 Cursor, 🏄 Windsurf IDEs and 🌀 Codex. What I do: 📱 Mobile apps, 🖥️ Desktop apps, 🌐 Websites, ⚙️ Web services, 👨🏻‍💻 Admin Backends, 🧩 API for them, 🤖 AI agents and ChatGPT/Claude integrations. 🚀 My own products: I don't only build for clients — I ship my own apps end to end, alone, from idea to the App Store, and keep them running. 🕰️ Insight Countdown is a countdown app for iPhone, iPad and Mac: SwiftUI, SwiftData, private iCloud sync, widgets, and an alarm that rings through silent mode and Focus. 📶 WiFi QR Studio prints WiFi QR cards at exact DPI. Both have multilingual marketing sites in Astro and Tailwind. So when I estimate your project, I'm estimating work I've done for myself — store review, crash reports, support and updates included. 🤖 AI agents: I've shipped an AI agent handling inbound marketplace leads for live paying customers. It acts on an external event with nobody pressing anything, takes real actions in the world (replies to a person in chat, sends SMS, starts a phone call), follows up hours and days later, keeps conversation state and changes its own later behaviour from what it reads. What separates that from a demo is predictability, and that's where the engineering goes: making bad output structurally impossible to send rather than asking the model nicely, idempotent delivery so a retry can't message someone eleven times, and switches that fail toward the safe side. Kinds of software I've created: 🛍️ Shopping & online stores, 🏃 Sports, 🎮 Games, 🧘 Medicine & well-being, ✈️ Travel, 💰 Bank systems, 📣 Ad networks, 🛡️ Insurance, 🛬 Landings. 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, 🌟 Google Gemini API, 🅰 Astro, ⚡️ Vite, 🐻 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, 💾 SwiftData, ☁️ CloudKit, ⏰ AlarmKit, 🧩 WidgetKit, 🎥 Lottie Files, 🥤 Cocoa Touch, 🥥 Cocos2D, 🅻 Laravel, 🎵 Symfony, 🆈 YII and YII2, 🔥 CodeIgnitor, 🆉 Zend Framework, 📍 CoreLocation, 🎥 CoreAnimation, 🏠 Apple HomeKit, ❤️ Apple HealthKit, 💰 Superwall, 💳 Stripe, ☎️ Twilio. Databases: 🍃 Mongo, 🐬 MySQL, 🪶 SQLite, 🍉 Watermelon DB, ⚡️ Supabase, 🔥 Firebase, 🐘 Postgres, 📄 TypeORM, ➡️ Doctrine, ⚪ DynamoDB/PartiQL, 🔴 Oracle, 🅲 CoreData, 🟣 Realm. I design the schemas too — relational and NoSQL, with indexing and query performance in mind. Cloud Computing: 🔺 AWS (Lambda, DynamoDB, SQS, EventBridge, S3, CloudFront, EC2), 🌥️ Google Cloud Platform, 🐳 Docker, ☸️ Kubernetes, ☸️ Google Kubernetes Engine, 🌊 DigitalOcean, 🅷 Heroku, 🆁 Render, ☀️ Netlify, ▲ Vercel, 🟠 Cloudflare, 🅰 Microsoft Azure. Serverless and edge functions, plus deployment and hosting on about half my projects. I have developed over 20 iOS apps, 15 React Native apps, several Android apps, APIs for some of them, over 20 websites, and shipped my own products to the App Store. I'm proficient in problem-solving, with a solid track record of fixing complex problems teams had struggled with on their own — usually performance issues or hard-to-track bugs. How I work: ⚡ I reply fast and I'm easy to reach — quick responses are what clients mention most. 🕒 Based in Europe: in sync with European clients, day shifted later for US ones, and I've worked across Asian time zones too. 🎯 I work autonomously: give me the goal and I'll plan it, ask what actually matters, and keep you posted. 💡 I don't just execute tickets — I treat your project as my own and tell you when I see a better way. 🧵 I've worked in around 15 teams, and can also deliver an app, API or server entirely on my own, turnkey. Languages: 🇬🇧 English C1, 🇷🇺 Russian and 🇧🇾 Belarusian native, 🇵🇱 Polish B1. I like to explore new technologies and build software of any complexity. I follow best practices, test thoroughly, and write clean, readable code any other developer can maintain.

👋 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 - Adobe Commerce (Magento) Developers - Drupal Developers

Top Rated Plus | 100% Job Success | Ruby on Rails Expert | Sharetribe | Shopify | DevOps I'm a Top Rated Plus Ruby on Rails Full Stack Developer specializing in Sharetribe marketplace development, Shopify custom apps & themes, and scalable SaaS platforms. With 100% Job Success and $40K+ in delivered projects, I help businesses build, launch, and scale production-grade web applications. Whether you need a Sharetribe marketplace customized, a Shopify store built from scratch, an MVP launched fast, or a complex Rails application maintained and scaled — I deliver clean, production-ready code with reliable deployments. 🔧 What I Build: • Sharetribe Flex & Go — Custom marketplace development, transaction flows, payment integrations, and platform customizations • Shopify — Custom Liquid themes, private/public apps, GraphQL & REST API integrations, headless commerce • Ruby on Rails Applications — SaaS platforms, APIs, admin dashboards, multi-tenant systems, e-commerce • React.js & Vue.js Frontends — SPAs, interactive dashboards, Hotwire/Turbo integration • Flutter Mobile Apps — Cross-platform iOS & Android applications • DevOps & Cloud — Docker, CI/CD pipelines, AWS, Oracle Cloud, zero-downtime deployments ⚙️ Core Technical Skills: • Ruby on Rails 5–7 (Expert) — ActiveRecord, Sidekiq, Redis, ActionCable, Hotwire • PostgreSQL — Query optimization, database design, performance tuning, Supabase • React.js, Vue.js, JavaScript/TypeScript, Node.js, React.js • Shopify Liquid, Shopify APIs (GraphQL & REST), Shopify App Development • Sharetribe Flex SDK, Sharetribe Go Customization • REST & GraphQL API Development • Stripe, PayPal, and payment gateway integrations • Docker, AWS (EC2, S3, RDS), Heroku, CI/CD, Nginx, Puma • Decidim open-source platform customization • Git, RSpec/Minitest, TDD 🏗️ Specialized Experience: • Sharetribe two-sided marketplace development & customization • Shopify custom theme and app development • SaaS & multi-tenant application architecture • Legacy Rails upgrade (Rails 4/5 → Rails 7) • API integrations and third-party service automation • Performance optimization — slow query fixes, caching, background jobs • Full DevOps — server setup, deployment automation, monitoring ✅ Why Clients Choose Me: • Top Rated Plus — Top 3% on Upwork • 100% Job Success Score — Every client satisfied • $50K+ delivered on Upwork with excellent reviews • Full-stack ownership — I handle frontend, backend, database, and deployment. No coordination overhead • Fast turnaround — Available 30+ hrs/week, 0-4 hour response time • Clean, maintainable code — Tested, documented, built for production from day one 💬 Ready to start? If you need a Sharetribe marketplace customized, a Shopify store built, an MVP launched, or a Rails application fixed and scaled — invite me to your project or message me directly. Free consultation for all new clients.

TOP-RATED Ruby on Rails Expert from Upwork I am a full-stack Ruby on Rails developer with extensive experience with more than 8 years of working experience in a wide variety of business areas, including healthcare, real estate, cloud automation, and more. I write clean, modular, well-documented code with security and scalability in mind and help create simple, friendly, accessible user interfaces. My main passion is to build clean, robust software that solves the problem of users. I have good skills in API design, complex client/server interaction, and a well-tested codebase. I also have experience in UX, product, and project management, and I know how to be a part of a good team and how to be a leader as well. If you are looking for someone experienced and can do anything to make your business successful, you probably are looking for me. ==== My good skill set ==== * Ruby/Ruby on Rails * PostgreSQL, MongoDB, Redis, DynamoDB, RethinkDB * jQuery, CoffeeScript, SASS, Twitter Bootstrap * ReactJS/AngularJS * HTML5, CSS3, JavaScript (ES6) * TDD: RSpec, MiniTest * Heroku, AWS EC2, DigitalOcean, OpenShift * Data Crawling/API Developing * Git, DevOps, Docker * Shopify Apps

✅ Senior Ruby on Rails Developer ✅ Backend, APIs, PostgreSQL, Docker, AWS ✅ Experience building and improving production web applications ✅ Strong focus on clean architecture, performance, and maintainability I help startups and businesses build, improve, and maintain Ruby on Rails applications that are reliable, scalable, and ready for real-world use. My main focus is backend development with Ruby on Rails, including REST APIs, database design, background jobs, third-party integrations, bug fixing, refactoring, and performance optimization. I work on both new features and existing systems, always aiming for clean, maintainable solutions that support business growth. I’ve worked on production systems with high operational demands, including platforms that require solid backend workflows, job processing, monitoring, integrations, and stable deployments. What I can help you with: • Ruby on Rails backend development • REST API development and integrations • PostgreSQL design and query optimization • Background jobs with Sidekiq and async workflows • Refactoring legacy Rails applications • Performance optimization and bug fixing • Docker-based development and deployment environments • AWS and production support • RSpec testing and code quality improvements Tech stack: Ruby on Rails, Ruby, PostgreSQL, Sidekiq, Docker, Git, CI/CD, Linux, Amazon ECS, REST APIs, JavaScript I care about writing clean code, communicating clearly, and delivering work that is practical, stable, and useful for real business needs. Whether you need help building new backend features, improving an existing Rails app, integrating external services, or solving complex issues in production, I’m ready to help.

I'm a Full Stack Developer React Node, SaaS Developer, and Node.js Developer with 15 years of experience, covering Full-Stack development, SaaS development, Mobile App Development, and AI Automation. A few facts about me: 🏆 100% Job Success score 🏆 125+ projects delivered from MVP to enterprise projects 🏆 10,000+ active users across delivered projects What I can develop: ✔️ B2B, B2C, AI-powered, Multi-tenant SaaS platforms as a SaaS developer with experience in 50+ SaaS Platform development ✔️ AI Automation, AI workflows, AI Chatbot and AI Agent Development that reduces manual operations by up to 70% ✔️ Prototype and proof of concept development saving 40% of budget as a Full Stack node.js react developer ✔️ Custom CRM and ERP systems, Internal tools and other management solution cutting admin costs by 40% as a Full Stack Developer React Node ✔️ Booking systems and booking platforms that boosting daily bookings by 30% ✔️ Marketplaces, E-commerce and fintech platforms that boosting sales conversions by 25% ✔️ Admin panel, admin dashboard, and analytics dashboard with charts that cutting reporting time by 60% ✔️ Custom scalable Web Application, website and other Web Development projects driving 40% more organic traffic as a Full Stack Web Developer ✔️ Mobile applications from design to iOS and Android App Development, covered by React Native developer and Mobile App developer ✔️ Code audit, Software Architecture & Design, production delivery, debugging, and production bug fixing, reducing errors by 40%. ✔️ role-based access, payment flows, billing and subscription logic, cutting failed payments by 30% ✔️ User Authentication, user management systems, system administrator, and business operations workflows for 10,000+ users Why clients choose me as a Technical partner: ✔️ SaaS MVP development in 4–6 weeks ✔️ AI-first approach using Cursor, Claude Code, Codex, and Lovable for up to 30% faster development as a Full Stack Developer React Node ✔️ AI Development and AI App Development experience across 35+ AI-powered projects ✔️ Improving page load speed by 55% as a Front End developer React ✔️ Increased database/API response speed by 5x as a Node.js backend developer and Node.js Developer ✔️ Built 120+ API endpoints, microservices, and serverless functions as a MERN Stack developer and javascript developer ✔️ Managed 500K+ records with Database Architecture, Database Design, Prisma, and RLS ✔️ Supported 99.9% uptime with cloud deployment and production deployment ✔️ Reduced deployment failures by 30–40% through CI/CD and release automation ✔️ Improved user experience, engagement, and visibility through dashboards used by 10K+ users As a Senior Full Stack Developer React Node and SaaS Developer, I have 15+ years of experience with: ⚙️ JavaScript, TypeScript, Python ⚙️ React, Next.js, App Router, Vite, Vue.js, Angular, Redux, jQuery, HTML, HTML5, CSS, CSS 3, Canvas ⚙️ Node.js, NestJS, ExpressJS ⚙️ Tailwind CSS, Material UI, Bootstrap, Shadcn/ui ⚙️ SQL, PostgreSQL, MySQL, MongoDB, Supabase, Firebase, Firestore, Redis, Prisma, RLS, Auth ⚙️ Amazon Web Services, AWS S3, AWS Lambda, Google Cloud Platform, Microsoft Azure, Vercel, Railway, DigitalOcean, Cloudflare, Docker, Kubernetes ⚙️ Testing (Jest, Playwright), Monitoring (Sentry), Logging ⚙️ Git (GitHub, GitLab, Bitbucket) ⚙️ LLM, LangChain, RAG, Artificial Intelligence ⚙️ Zapier, n8n, Make, GoHighLevel, GHL ⚙️ HIPAA, GDPR, SOC 2 ⚙️ Figma, Adobe XD, Sketch As a Senior Full Stack Developer React Node and Node.js Developer I have deep experience in API integration: RESTful API, third-party REST API, webhooks, OpenAI API, Stripe API, Twilio API, Anthropic Claude API, ElevenLabs API, ChatGPT API, GraphQL API, WhatsApp business API, Google OAuth, and various Google APIs. As Full Stack Developer React Node and SaaS developer I experience in projects for: Hospitality, Travel, Healthcare, Fitness, Ecommerce, FinTech, Logistics, Finance, Education, E-learning, Retail, HR, Business Services, Media & Entertainment, AI, SaaS marketing, Real Estate platform, etc. 💪 As CTO of Malevich Studio, I can provide: ✔️ UX & UI / Web Design: UI UX Designer support with Figma, Responsive Design, Adaptive Web Design, Software Design, Graphic Design and Adobe Photoshop for 25–40% conversion improvement ✔️ Shopify, PHP or WordPress developer and cms developer for mobile friendly website support ✔️ Python developer and Full Stack developer Laravel Vue Other skills: Application Improvement, Software Development, Software Debugging, Software Consultation, Agile Software Development, Desktop Application, Software Testing, Standalone Application, CodeIgniter, Apache Hive, Jakarta Server Faces, Hybris, Cloud Computing, Java, Ruby on rails, Back-End Development Framework, Front-End Development Framework 🚀 Click “Invite” if you need a Full Stack Developer React Node, Full Stack AI SaaS Developer, or Node.js Developer.