Hi, I'm experienced in developing SaaS RealEstate Platforms, MVPs, Full-Stack Solutions, API Integrations, Payment Gateways, and Deployments. Some of my Key Features at work: ✔ Database Designing ✔ MicroServices Architecture ✔ AWS Services like EC2, S3, RDS, Load Balancer, Code Commit, Key Manager, SES, Route 53 etc ✔ Payment Gateway Integration ( Stripe, PayPal, Authorize.Net, 2checkout, Meezan API, Alfalah API, HBL API, JazzCash, UBL) ✔ Stripe Checkout, Charge, Subscriptions, Connect, Payouts ✔ Google APIs like Google Maps (Route mapping, Distance mapping, Shortest distance), Google Calendar, Vision API, etc ✔ Video Platforms Integration and Custom WebRTC integration ✔ AppSumo Partner Integration ✔Responsive Web Development (All Screen Sizes) ✔ Cross-browser compatibility (Google Chrome, Firefox, Safari, Opera, Internet Explorer) ✔ Ability to work with Adobe Photoshop. 💥 Technologies: ⚡ PHP 5.6, 7.2, 7.3, 7.4, 8.0, 8.1 ⚡ Laravel 5, 6, 7, 8, 9, 10 ⚡ React.js / Next.js / Vue.js / React Native / JavaScript / jQuery / Ajax ⚡ Pusher, Websockets ⚡ HTML, HTML5 ⚡CSS, CSS3 ⚡Bootstrap 3, 4 & 5 ⚡ MySQL, PostgreSQL, DynamoDB, Firebase

🏆 Senior AI Mobile Full-Stack developer. Trusted by startups and global brands like IMAX. 🌟 Only 5-star verified reviews. 🇪🇺 European quality. 🧑🏻‍💻 Founder of VibeMeal - AI calorie tracking app ($25K MRR) Hello, I'm Stepan, a Senior Full-Stack developer. With over 6 years of experience in the web and mobile development industry, and AI-driven development industry, I have personally led 40+ successful projects, delivering exceptional results for my clients. What clients say about me: 🌟 "Stepan was great. He worked on the form in a timely manner, and was very patient when I couldn't get back to him quickly. The communication was great, his work is excellent, and I will most definitely work with him in the future again." 🌟 "Wonderful person. Focused and dedicated to tasks." 🌟 "Stepan is very responsible developer. Not only he did the job before the deadline, he also did even more work to simplify the upcoming app integrations, thank you. Highly recommended!" So far I’ve: - Worked with clients in a wide diversity of domains: healthcare, catering delivery, travel agency services, education, sales and marketing, vehicles, metals & mining. - Collaborated with customers 🌏 worldwide: Europe (United Kingdom, Germany, Belgium, Croatia, Slovakia, Estonia, France, Norway), USA, and Australia. - Worked with inspired 🚀startups & enterprise companies. My services: - Mobile App Development - Develop Website - Build Mobile Application - MVP development - Build Marketplace - Develop Chrome extension - Hybrid Development - Build Prototype Here are my core skills: 🎯 Frontend: - React - TypeScript / JavaScript - Next / Gatsby / SPA - Web3 - REST / GraphQL - Cypress Backend: - Express / Nest - AWS Serverless - MongoDB / DynamoDB - MySQL, PostgreSQL - Firebase - AI integration (OpenAI, LangChain, TensorFlow) Mobile development: - React Native - Flutter - Firebase Infrastructure: - AWS - GCP - Terraform - Docker - CI/CD AI & Automation: - AI chatbots & assistants - AI-driven automation for workflows - Computer vision & NLP features Web3: - Truffle - Web3 - Solidity VR/AR: - Unity Reach out to me today, and let's establish a long-lasting and fruitful collaboration. 🤝 Don't hesitate to get in touch right away! ✉️ Keywords to find me: Mobile App Development, Claude Code, Cursor, Smartphone, Android, Android App Development, Dart, Expo, Firebase, Firetime Realtime Database, Flutter, FlutterFlow, Hybrid App Development, In-app Purchases, iOS, iOS Development, Java, Kotlin, Native App Development, Push Notifications, React Native, Swift, User Authentication, UX Design, Node.js, AI Mobile App Development, AI Chatbots, AI Automation, AI Assistant, OpenAI, ChatGPT

If your team is still losing hours to manual work, you need an AI agent developer not another freelancer who just connects tools. I'm a Top 1% AI agent developer on Upwork with $200K+ in verified earnings, 34+ completed projects, and a 100% Job Success Score. As an AI agent developer, I focus on AI agent development, multi-agent orchestration, and intelligent automation, building production-ready systems on n8n, Make, and Zapier powered by Claude, OpenAI, and LangChain that replace manual processes with workflows running 24/7 without human intervention. My clients SaaS companies, e-commerce brands, marketing agencies, and enterprise teams save 100–200+ hours a month and cut operational overhead by 30–60% by working with an AI agent developer who builds for production, not prototypes. The difference is the agent, not just the automation. Through careful multi-agent orchestration, the systems I build as an AI agent developer reason through context, make decisions, and recover from failure on their own. That's the work of an AI agent developer you can trust in production, not a workflow that breaks the first time an API misbehaves. What I build (as your AI agent developer): AI agent development for business automation as an AI agent developer, I build autonomous agents on n8n that reason, route, and self-correct, with Claude as the cognitive layer and LangChain powering memory and tool-use, so every system understands context and recovers from failure automatically. Multi-agent orchestration for marketing and CRM working as an AI agent developer, I coordinate agent teams handling lead qualification, audience segmentation, follow-up sequences, and real-time CRM sync across HubSpot, Salesforce, and Airtable, orchestrated on n8n so your team focuses on revenue, not repetition. Customer support AI agent development as an AI agent developer, I build agents with LangChain and Claude that classify tickets, detect intent, generate summaries, and suggest responses, integrated with Zendesk to eliminate manual triage. Data pipeline automation as an AI agent developer, I build automated ingestion, transformation, and structured storage on n8n feeding live dashboards, with LangChain-based agents that clean and summarize so your team reads insights, not raw data. Recent results: As an AI agent developer, I built a healthcare automation project on n8n, Claude, and LangChain — automating ticket processing, PDF extraction, sentiment analysis, and AI summaries that cut manual support workload by 70%. Working as an AI agent developer, I deployed an automation stack for a 12-account digital agency on n8n, reducing campaign setup time by 65% with no added headcount. As an AI agent developer, I engineered a multi-agent orchestration sales pipeline using LangChain, n8n, HubSpot, and Claude that cut lead response time from 4 hours to under 4 minutes, replacing roughly 3 hours of daily manual SDR work. Core stack: As an AI agent developer, my toolkit includes n8n · Make · Zapier · Claude · OpenAI · LangChain · Zendesk · HubSpot · Salesforce · Airtable · Supabase · Python · Node.js How I work: Every engagement with this AI agent developer starts with a free workflow audit. I map your processes, identify where AI agent development and automation add the most value, and design full multi-agent orchestration architecture using LangChain before building. If your business runs on repetitive processes, there's an AI agent developer solution that runs it for you. Message me with your use case, and as your AI agent developer I'll show you where multi-agent orchestration and automation create the most value free workflow audit included. Looking for an AI agent developer you can trust long-term? Let's talk.

I build digital products end to end — product planning, UI/UX design, development, CMS architecture, hosting, SEO, analytics, content systems, and growth strategy. My background spans SaaS, healthcare, eCommerce, AI platforms, and subscription products. I’ve led projects for startups and enterprise teams, including Qualitest, Sydney Health, RevTrax, and multiple high-traffic marketing and commerce platforms. Most clients bring me in when they need more than just a developer. I help turn ideas into systems that are usable, scalable, searchable, and built around business goals. Work includes: - SaaS platforms - AI-powered applications - WordPress, Shopify, Webflow, and headless CMS builds - React / Next.js applications - Subscription and eCommerce systems - SEO and performance optimization - UX/UI design and prototyping - Cloud infrastructure and deployment - Content architecture and conversion flows - Marketing websites and lead generation systems Tech stack includes React, Next.js, Node.js, WordPress, Shopify, Webflow, PHP, AWS, Docker, Sanity, HubSpot, Stripe, and modern SEO tooling. Based in New York.

I scaled a Pan India job platform from 0 to 2 million users in 1 year — sole architect, sole engineer, full AWS infrastructure. That's not a team effort I'm describing. That's what I do when a founder trusts me with their product. With 15+ years in software development and 9+ years building production SaaS on the MERN stack, I specialize in one thing: taking an early-stage product from whiteboard to live, scalable system without the founder needing to manage me. I've built and shipped multi-tenant SaaS platforms with RBAC, Stripe billing, real-time features, and third-party integrations at scale. I set up AWS infrastructure from scratch, EC2, RDS, S3, CI/CD pipelines, and hand it over documented and production-ready. My engagement style is iterative: you see working software every week, not a big reveal at the end. What I build for early-stage SaaS founders: ✅ Multi-tenant architecture with role-based access control from day one ✅ Subscription billing via Stripe: plans, trials, webhooks, invoicing ✅ REST and GraphQL APIs built to scale, not just to work ✅ Next.js frontends that are fast, clean, and maintainable ✅ Real-time features: notifications, live dashboards, WebSockets ✅ AWS infrastructure built right, not duct-taped together ✅ Third-party integrations done properly with error handling and retry logic ✅ Weekly demos so you always know exactly where your product stands Tech I work with daily: Backend: NodeJs, ExpressJs, TypeScript, GraphQL, REST APIs, SocketIO Frontend: NextJS, ReactJS, Tailwind CSS, TypeScript Databases: PostgreSQL, MongoDB, MySQL, Redis, Elasticsearch Cloud: AWS (EC2, S3, RDS, Lambda, SES, SNS, CloudWatch, Route53, Fargate) DevOps: Docker, Kubernetes, GitHub Actions, CICD, Terraform, NGINX Payments: Stripe Auth: JWT, OAuth 2, AWS Cognito How I work: I consult on architecture before writing a single line of code. I ask uncomfortable questions early so there are no surprises late. I write code that the next engineer can read. I deliver on the timeline I quote — a recent client got their full deployment done in 1 day against a 3-day estimate. That's not luck, that's how I work. If you are a founder who needs one engineer to own the product end-to-end and ship without hand-holding, that's exactly the engagement I'm built for. Let's talk about what you're building.

Hello! Thank you for your interest in my profile. We work with small, medium and large Enterprises :) Our service explicitly allows the company to process business flow in CRM, marketing automation, and portals. 🎯 Guaranteed Best Quality 🎯 Quick and Timely Response 🎯 Keep Deadline ⚡️ What made me so successful on Upwork? ✅ I respect time, communicate well, and value clients' money 🙇 ✅ I build fast and with great quality. With OpenClaw, I can: ✅ Automate repetitive business tasks ✅ Build AI-driven data pipelines ✅ Integrate APIs and external services ✅ Process and analyze large datasets efficiently ✅ Develop custom workflow automation systems EXPERTISE: ✅ React.js ✅ Material UI ✅ Node.js, VueJs ✅ Firebase (Database, FireStore), MongoDB, PostgreSQL, MSSQL, MySQL, Sequelize ✅ Angular, AngularJS, NgRx, and RxJS ✅Github, GitLab, Asana, and Trello ✅JavaScript, HTML, CSS, Bootstrap, React.js, Material-UI, SCSS, Tailwind CSS, Redux Toolkit, Vue.js, jQuery, Nuxt.js and Vite ✅Node.js, CodeIgniter, PHP (Core and OOP), MySQL, MongoDB, Laravel and API Integration ✅Google Firebase, Heroku, AWS and GitHub ✅SuiteCRM, Mautic CRM, Zoho CRM, VTiger CRM, JIRA, n8n and Zapier ✅WebSocket and Twilio ✅Algolia ✅Payment Gateway Integration ✅ZOHO ONE ✅3rd Party Integration I believe that skills and efforts are essential to producing high-quality work that I consistently deliver to my clients. I am a professional web application developer who has more than 13 years’ experience. I focus on solving new complex tasks that help me prove my expertise in this field.

Top Rated Plus | 100% Job Success | 9,600+ hours. I build production AI agents, RAG systems, and voice agents — LangGraph workflows, hybrid search with Qdrant & Pinecone, Vapi + ElevenLabs voice, MCP integrations — inside real React, Node.js, and Laravel applications. If you need AI that works in production — not a prototype — you're in the right place. 9+ years full stack, Certified Prompt Engineer, and every system below is running live for real businesses. ━━━ WHAT I BUILD ━━━ 🤖 AI AGENTS — Multi-agent workflows with LangGraph: Postgres/MongoDB checkpointing, agent memory, LangSmith observability, multi-LLM routing (OpenAI, Claude, Gemini), custom MCP servers. 📚 RAG THAT DOESN'T HALLUCINATE — Most RAG setups do naive vector search and fail on keyword-heavy questions. I build hybrid search: dense embeddings + BM25 sparse vectors with RRF fusion (Qdrant, Pinecone). Ingestion from PDF, DOCX, XLSX, and live website crawling. 📞 VOICE AI AGENTS — Phone and web voice agents with Vapi + ElevenLabs: natural TTS, call flows, real-time CRM and calendar actions. ⚙️ AUTOMATION — n8n workflows, Playwright + Browserbase browser automation, web scraping pipelines, connected to your existing tools and APIs. 🧱 FULL STACK & SaaS — React, React Native, Next.js, Vue, Node.js, Laravel. Multi-tenant architecture, WebSockets real-time features, API design, database architecture. 🔌 INTEGRATIONS SHIPPED IN PRODUCTION — Stripe, QuickBooks, HubSpot, Plaid, Nylas, RingCentral, HelloSign, Mailchimp, Algolia, Authorize.net, Avalara, FedEx/ShipStation, Pusher, Google Cloud. ━━━ FLAGSHIP PROJECT ━━━ 🚀 Studio98.ai — AI workforce platform, architected from idea to launch. Deploys custom AI agents for sales, support, marketing, and HR/finance with voice, real-time chat, and RAG answers. Under the hood: custom hybrid search engine (Qdrant, sparse + dense vectors, RRF fusion), multi-tenant SaaS architecture, Vapi phone agents, and an embeddable chat/voice widget businesses drop into their own sites. ━━━ WHY CLIENTS STAY ━━━ ✶ 100% Job Success, Top Rated Plus, 9,600+ tracked hours ✶ Production AI across multiple industries — not demos ✶ Clean, maintainable code, easy to scale and hand off ✶ Strict on budgets and deadlines, built for long-term relationships ━━━ STACK ━━━ LangChain · LangGraph · OpenAI · Claude · Gemini · Qdrant · Pinecone · Hybrid Search · RAG · Embeddings · LangSmith · MCP · Vapi · ElevenLabs · n8n · Playwright · Node.js · TypeScript · React · React Native · Next.js · Vue.js · PHP · Laravel · MySQL · PostgreSQL · MongoDB · Redis · Docker · AWS · Google Cloud · WebSockets · REST APIs · Microservices ━━━ NEXT STEP ━━━ Message me with what you're building. I respond fast — and I'll send you a short plan of how I'd approach it before you commit to anything.

Looking for a highly experienced e-commerce developer to scale your online business? With over 10 years of full-stack development experience, I specialize in building, customizing, and optimizing high-performing online stores across Magento 2, Shopify, and WooCommerce. From pixel-perfect frontends to complex backend API integrations and high-speed server environments, I provide end-to-end solutions tailored to your business goals. Here is how I can help your store succeed: 🛒 Shopify Expertise • Theme Customization (Liquid, CSS, JavaScript) • Custom Section & Block Development • App Integration, Configuration & Troubleshooting • Shopify API & Metafield Customization • Multi-Region Pricing & Internationalization Setup • Complete Store Setup, Speed Optimization & Maintenance 🟠 Magento 2 Expertise • End-to-end Infrastructure, Architecture & Maintenance • Custom User Workflows: Tailoring Checkout, Contact, Login, and Registration pages • Advanced Performance Tuning using Varnish, Redis, and optimized servers • Custom Module Integration & Third-Party API Bridging 🟣 WooCommerce & Additional E-Commerce Skills • Complete WooCommerce Setup & Custom Development • Social Media Integrations (Facebook, Instagram, Google Shopping) • Automated Product Import/Export via CSV & Complex Data Management • REST API / JSON Integrations to connect your store with ERPs/CRMs ⚙️ My Technical Stack & Infrastructure: • Languages: PHP (OOP), Liquid, JavaScript, jQuery, Ajax, JSON, HTML, CSS (LESS) • Databases & Search: MySQL, ElasticSearch, Algolia • Server & DevOps: Linux (Ubuntu), Nginx, Apache2, Docker, Redis, Varnish • Workflow Tools: Git (GitHub, GitLab, Bitbucket) • Project Management: Jira, Asana, Trello, Basecamp I pride myself on writing clean code, creative problem-solving, and a commitment to my clients' long-term success. Send me an invite, and let’s discuss how we can elevate your store's performance. 🔑 𝐊𝐄𝐘𝐖𝐎𝐑𝐃: Magento 2, Adobe Commerce Cloud, Headless Magento, Magento PWA, Magento 2 Upgrade, Magento Extension Development, Magento Theme Development, Magento Customization, Magento API Integration, Magento Migration, Magento Performance Tuning, Magento Speed Optimization, Magento Security, Magento Checkout, Magento Payments, Magento Marketplace Integration, Magento Modules, Shopify Plus, Shopify Developer, Shopify Expert, Shopify Liquid, Online Store 2.0, Headless Shopify, Shopify Hydrogen, Shopify Oxygen, Checkout Extensibility, Shopify App Development, Storefront API, Metaobjects, Metafields, Shopify Markets, Shopify B2B, Custom Sections, Shopify Migration, Custom Storefront, Liquid Programming, WooCommerce Development, WooCommerce Customization, E-commerce Development, B2B E-commerce, B2C E-commerce, Multi-Vendor E-commerce, Cross-Platform E-commerce, Digital Commerce, Headless Commerce, Payment Gateway Integration, Checkout Optimization, Conversion Rate Optimization, ERP Integration, Third-Party Integration, App Integration, GraphQL API, REST API, Webhooks, Page Speed Optimization, E-commerce SEO, E-commerce Migration, Product Catalog Management, Product Import/Export Automation, CSV Automation, Multi-Region Pricing, Internationalization Setup, Social Media Integration, Theme Customization, Responsive E-commerce Design, Full-Stack Development, PHP, Object-Oriented Programming, MySQL, JavaScript, jQuery, Ajax, JSON, HTML, CSS, LESS, Web Maintenance, Bug Fixing, Linux, Ubuntu, Nginx, Apache2, Docker, Server Deployment, Server Setup, ElasticSearch, Algolia, Varnish, Redis, Database Management, Git, GitHub, GitLab, Bitbucket, Version Control, Jira, Asana, Trello, Basecamp, Agile Project Management

I build SaaS platforms, billing systems, and internal tools that handle real business operations — not just UI. If your project involves payments, invoices, automation, or complex workflows, I can help you build it the right way from day one. Over the past 5+ years, I’ve built: • Invoice systems with automated tax handling and PDF generation • Subscription & payment workflows (Stripe integrations) • Backend-heavy SaaS platforms with complex business logic • Cron-based automation systems (billing cycles, reports, notifications) • Admin dashboards with real-time data and reporting Most developers focus on UI. I focus on the backend logic that keeps your business running reliably. 💡 What I can help you with: • SaaS products (end-to-end architecture & development) • Billing, subscriptions & payment systems • Invoice generation & tax calculation systems • Internal tools & admin dashboards • Automation (cron jobs, APIs, integrations) ⚙️ Tech Stack: Next.js, React, Node.js, NestJS PostgreSQL / MongoDB Stripe, REST APIs, GraphQL TypeScript, Tailwind AWS, Vercel, Docker 📈 Selected Work: • Built an invoicing system with automated tax handling and PDF generation • Implemented cron-based billing automation workflows • Developed backend logic for complex shift-based calculations • Created scalable APIs powering analytics dashboards 🏢 Visitor Management System (SwipedOn-like) Built a full-scale visitor management system similar to :contentReference[oaicite:0]{index=0}, designed for real-world office environments. Key features: • Real-time visitor check-in/check-out tracking • Badge generation and identity capture • Host notifications (email/SMS alerts) • Admin dashboard with logs, analytics, and reporting • Secure, role-based access control Used for: • Corporate offices • Co-working spaces • Secure facilities 📅 Booking & Scheduling Platform • Developed a booking system with scheduling, user management, and payment flows • Built APIs handling availability, reservations, and real-time updates • Designed scalable backend for handling concurrent bookings --- If your project involves real business logic, payments, or automation — send me a message with your idea or problem. I’ll suggest the best approach before we even start.

Most mobile developers can ship an app. Most AI developers can wire up an API. I do both — which means I build mobile apps that are genuinely intelligent, not just polished wrappers around forms. I help founders, product teams, and agencies launch production-ready iOS and Android apps powered by the Anthropic Claude API: AI chatbots, document analyzers, smart assistants, agentic workflows, and automation features that would normally require a separate backend team. What I build: • FlutterFlow and Flutter apps with embedded Claude AI features — chat, summarization, document Q&A, smart recommendations, voice-to-text workflows, and personalized onboarding. • Custom Dart code injected into FlutterFlow projects when no-code hits its ceiling — clean architecture, Riverpod or Provider state management, and App Store / Play Store deployment. • Claude API backends on Python (FastAPI) or Node.js — function calling, tool use, RAG pipelines, MCP servers, and secure prompt orchestration. • Firebase, Supabase, Stripe, RevenueCat, OneSignal, Algolia, and HealthKit integrations for production mobile apps. • Automation layers using Claude Code, Claude Cowork, n8n, and Make to connect mobile apps to Xero, HubSpot, Google Sheets, and internal tools. Why clients hire me: Top Rated Plus on Upwork, 96% Job Success Score, $200K+ earned across 58+ projects. One developer covers both the mobile front-end and the AI backend — no coordination overhead, no contractor handoff gaps. Milestone-based delivery, daily Slack or Loom updates, and clean handoff documentation on every engagement. Send an invite with a short description of what you're building. I'll come back with a realistic plan, timeline, and recommended stack — and tell you honestly whether FlutterFlow is the right tool, or whether native Flutter or a hybrid backend approach will serve you better.