🥇 Top Rated Senior Full Stack Developer ⭐ 5-Star Ratings | ✅ Verifiable projects | ❇️ 6,000+ Hours | 100% refund if I set the wrong expectation and can’t deliver. No questions asked! I help startups and SaaS companies build fast, scalable, and reliable software. Whether you're a small business, nonprofit, or growing startup, I’ve worked with teams of all sizes to turn ideas into solid, high-performing applications. I bring both technical and strategic value. I can help you select the right technology stack, design scaleable systems, manage the product from start to finish, build and lead strong dev teams, and forecast timelines and keep budgets on track. Whether it's kicking off a brand-new project, fixing one that's gone off track, or scaling to support millions of users, my past experience has equipped me for your challenge. I proficiently utilize AI tools such as Cursor, GitHub Copilot etc to increase productivity and improve development. **Expertise includes: AI Automations: n8n Automation – Custom workflow design, API integrations and process optimization. Back-End: - Python: Django, FastAPI, Flask - Javascript: Next.js, Node.js, Nest.js, Express.js Front-End: - HTML, CSS, Tailwind, Bootstrap - Javascript: React, Next.js Angular, Vue.js, Grape.js - API Integration: REST, GraphQL, SOAP, MCP Databases: - MySQL, PostgreSQL, MongoDB, SQLite, Cassandra, MariaDB, Google BigQuery, Neo4j - Payment Gateways Integration: Stripe, PayPal, 2Checkout, Braintree, etc. - Server Setup & DevOps: Amazon Web Services Heroku Google Cloud Console Setting up CI/CD pipelines Industries I've worked with: 🔸 AI SaaS | Marketing Tech | Healthcare | eCommerce | Fintech | Customer Support | Real Estate 2024 onwards helping startups integration AI and develop efficient cost effective Generative AI solutions. - Implementing RAG - AI Agents or Chatbot Development - Finetuning LLMs - Reinforcement Learning from Human Feedback (RLHF) - Vector Databases Efficient data handling for AI and machine learning.

Hi, I am Harsh, a well-experienced full stack developer. I am dedicated to developing custom CRM, ERP and Workflow/Business Management software solutions. I have successfully delivered high-quality, on-time, and on-budget projects that address specific business needs. From streamlining medical records to optimizing production processes, I've successfully delivered projects that drive efficiency and growth. My expertise spans a wide range of applications, including: 🩺 Healthcare: HIPAA-compliant EMRs, telemedicine platforms, and patient portals 🏭 Manufacturing: Production planning, inventory management, and quality assurance systems 🚧 Construction: Cost estimation, project scheduling, and asset management tools 📈 Finance: Financial planning, accounting, and risk management solutions 🎓 Education: LMS platforms, student management systems, and assessment tools 🏢 Inspection: Asset management and quality control solutions 📦 Inventory: Order management, demand forecasting, and warehouse management systems I am passionate about helping businesses overcome their challenges and grow by providing innovative and effective software solutions. I am a strong communicator and collaborator, and I work closely with our clients to ensure that their needs are met and that they are satisfied with the final product. If you are looking for a custom software developer with the skills and experience to help your business grow, don't hesitate to get in touch. I would be happy to discuss your requirements and help you achieve your business goals. Our complete skillset includes the following skills: - Frameworks/Libraries: .NET, .NET Core, ASP.NET, ASP.NET MVC, ASP.NET Core MVC, WebAPI, Angular, React, Redux, Bootstrap, jQuery, Docker, - Frontend development technologies: Angular.js, React.js,Vue.js and Angular - Databases: MSSQL, MySQL, PostgreSQL, SQLite, MongoDB, CosmosDB - Dev Tools: Asana, JIRA, Trello, BitBucket, GitHub, Beanstalk - Cloud: Azure App Service | Azure Functions | Active Directory | Azure API Management | Text-to-Speech | Speech-to-Text | Cognitive Services (Language Understanding LUIS) | Cognitive Search | Logic Apps | AWS EC2 | AWS S3 - Mobile: Xamarin Forms, MAUI - CI/CD: Bitbucket Pipelines, VisualStudio Online, Docker Cloud, Kubernetes (basic) - Testing: TDD/BDD, Cypress, NUnit, Selenium

People are the biggest asset for me in every project. Being a high level PM I try to create appropriate conditions for everyone to reveal their bests in order to make the whole team successful. I will always go an extra mile. I've got more than 12 years of experience in Healthcare, Telecommunications, Fintech, IoT, e-Commerce, and Website /Application development. - Hands-on experience with Atlassian products(Jira, Confluence), ClickUp, Asana, MS project - Wireframing/Prototyping/Preliminary design with Miro, Moqups, Figma - Product strategy planning, product/market fit/customer analysis - Product requirements creation according to business need - Use cases/use story generation and documentation creation - App flow/App map/Process flow reports - Experience with a team of 35+ people(design, analytics, development) - Business case and product roadmap development - Industry research and best practice implementations - Competitor analysis and evaluation of product functionality - Analytics tracking recommendations/reports recommendations - Experience in Startup management - Experience in payment system's integrations - Project management, initiation, planning, execution, monitoring/control, and closing according to

Full-Stack Developer specializing in Backend Development, SaaS Applications, and MERN Stack solutions. I help startups, entrepreneurs, agencies, and established businesses build secure, scalable, and high-performing web applications that drive growth and deliver exceptional user experiences. With years of experience in modern web development, I have successfully developed SaaS platforms, CRM systems, marketplaces, business automation tools, dashboards, enterprise applications, and custom web solutions. My expertise covers the entire development lifecycle, from product planning and architecture design to deployment, optimization, and ongoing support. ----------- My Expertise -------------- Full-Stack Development - Custom Web Application Development - Enterprise Software Development - Scalable Application Architecture - Frontend & Backend Development - API Development & Integration - Cloud-Based Applications Backend Development - Node.js Development - Express.js Development - RESTful API Development - Database Architecture & Optimization - Authentication & Authorization Systems - Payment Gateway Integration - Server Performance Optimization MERN Stack Development - MongoDB - Express.js - React.js - Node.js - Redux - Next.js - TypeScript SaaS Development - SaaS MVP Development - Multi-Tenant SaaS Platforms - Subscription-Based Systems - User Management & Permissions - Analytics Dashboards - Workflow Automation Solutions - Scalable SaaS Architecture Technologies I Work With - JavaScript (ES6+) - TypeScript - React.js - Next.js - Node.js - Express.js - MongoDB - PostgreSQL - MySQL - Redis - Docker - AWS - Firebase - GraphQL - REST APIs - Git & GitHub What I Can Build ✔ SaaS Platforms ✔ CRM & ERP Systems ✔ Marketplace Applications ✔ Business Automation Tools ✔ Admin Dashboards ✔ Startup MVPs ✔ Booking & Scheduling Platforms ✔ API-Driven Applications ✔ Real-Time Applications ✔ Enterprise Portals ✔ AI-Powered Web Applications ✔ Custom Software Solutions Why Clients Choose Me I believe successful software is more than just clean code. It should be secure, scalable, maintainable, and aligned with business goals. When working on a project, I focus on: - Scalable Architecture - Clean & Maintainable Code - High Performance & Security - Modern Development Practices - Business-Oriented Solutions - Long-Term Scalability - Exceptional User Experience Whether you need a complete SaaS product, a custom web application, a robust backend system, API development, or a full MERN Stack solution, I can help transform your idea into a reliable and scalable digital product. Let's discuss your project and build software that creates real business value and long-term success. Core Skills: Full-Stack Development, Backend Development, SaaS Development, MERN Stack Development, React.js, Next.js, Node.js, Express.js, MongoDB, PostgreSQL, API Development, JavaScript, TypeScript, Cloud Solutions, Startup MVP Development, Enterprise Application Development. 🚀

🏆 Top Rated Plus | 100% Job Success Score Proven track record of delivering high-quality enterprise solutions and custom software with maximum client satisfaction and zero friction. Need reliable Flutter Mobile App Development that performs flawlessly under real user load, scales seamlessly with your growth, and doesn’t require constant hotfixes after launch? As a Flutter Mobile Developer PM, I deliver production-ready, high-performance iOS and Android applications. My approach combines rock-solid scalable architecture, clean code, and seamless backend integration, ensuring your product remains ultra-stable during traffic spikes and heavy data usage. 📊 Our Agency Blueprint With 10+ years of agency experience in Flutter Mobile App Development, 250+ delivered projects, and 15,000+ hours spent mastering mobile architecture, we transform complex business ideas into high-performing digital ecosystems. On average, our team improves app performance by 40–60%, slashes crash rates by 30–45%, and boosts scalability capacity by 35–55% through structured architecture refactoring. ✨ Why Our Flutter Solutions Stand Out - Elite Status: Top Rated Plus with a flawless 100% Job Success Score. Global Scale: 250+ custom applications launched successfully across 45+ countries. - Industry Versatility: Deep expertise in SaaS, FinTech, Marketplaces, Healthcare, and Enterprise systems. - Speed & Stability: Advanced performance tuning that reduces load times by up to 60% and cuts crash rates by 40%. - Bulletproof Security: Secure authentication, multi-role systems, and data encryption. - Future-Proof Code: Clean, maintainable codebases that significantly lower long-term maintenance costs and support 5–10× user growth. 🚀 Flutter Mobile App Development Services 📌 Cross-Platform Flutter Development High-fidelity iOS and Android apps built from a single, optimized codebase. Custom mobile architecture tailored for long-term corporate scalability. UI/UX integration optimized for 60fps responsiveness and smooth animations. 📌 Backend & API Integration Secure backend connectivity aligned with strict Flutter Mobile App Development standards. REST/GraphQL API integration and real-time data synchronization (WebSockets). Seamless integration of payment gateways (Stripe, Apple Pay, Google Pay) and third-party SDKs. 📌 Architecture, Refactoring & Stabilization Rescuing and stabilizing legacy Flutter applications. Eliminating memory leaks and debugging complex crash loops. Codebase restructuring for enhanced maintainability and faster feature onboarding. 📌 Performance Optimization Deep app profiling and bottleneck detection. Advanced network request optimization and smart caching strategies. Minimizing backend latency impact on the mobile user experience. 📌 CI/CD, Deployment & PM Oversight Automated CI/CD pipelines for fast, reliable mobile releases. Full App Store & Google Play deployment management. Active Project Management (PM) ensuring transparent communication, clear milestones, and on-time delivery. 🔧 Workflow & Tech Stack Discovery & Analysis: Defining product goals, user journeys, and technical constraints to design a scalable Flutter Mobile App Development architecture. Architecture & Planning: Designing system logic, state management (Bloc, Provider, or Riverpod), and backend integration layers. Development & Integration: Writing clean Flutter code, connecting APIs, and ensuring pixel-perfect UI execution across all screen sizes. Testing & QA: Rigorous validation of performance under load, crash rates, and cross-device compatibility. Launch & Optimization: Structured production deployment with post-launch monitoring, typically boosting app efficiency by 40% within the first 90 days. 💡 Data-Backed Results (Recent Projects) Up to 60% faster app load times. Up to 40% reduction in crash frequency. Up to 50% improvement in API reliability. 5× growth in active users sustained without a single second of downtime. 🌎 Industries Supported 🏥 Healthcare & Telemedicine (HIPAA-compliant workflows) 🏦 FinTech & Secure Payments (High-security data handling) 🛒 Marketplaces & E-Commerce (High-traffic catalog & checkout optimization) 📈 SaaS & Data Analytics (Real-time dashboards & metrics) 🎓 EdTech & Learning Platforms (Smooth media streaming & offline modes) 🏢 Enterprise Tools (Internal business automation & role management) I serve as the PM for the mobile team, coordinating execution and ensuring stable product releases. 🚀 Let’s build a Flutter Mobile App Development solution that scales, performs, and grows with your users. 📞 Looking for a developer and PM who takes full responsibility for architecture and code stability? Send me a message, and let's discuss your project.

🚀 Services I Offer I help startups, founders, and growing businesses turn ideas into high-quality SaaS platforms, custom web applications, and ecommerce solutions that are built for long-term success. Whether you're launching an MVP, developing a new product, modernizing an existing application, or scaling your platform, I provide end-to-end full-stack development using Laravel, PHP, React, Vue.js, and proven software architecture. Over the past 9+ years, I've delivered SaaS platforms, custom web applications, ecommerce and marketplace platforms, CRM systems, booking platforms, learning management systems (LMS), healthcare applications, AI-powered solutions, payment integrations, and enterprise dashboards. My focus is on delivering clean, maintainable software that performs reliably, adapts to changing business needs, and provides a strong foundation for future growth. ⭐ Why Clients Hire Me Clients work with me because I don't just write code—I develop reliable software that solves real business problems and supports long-term business goals. ✔ 9+ years of professional full-stack development experience ✔ Built and launched multiple SaaS platforms, custom web applications, and business systems ✔ End-to-end development — from architecture and database design to deployment and ongoing support ✔ Strong expertise in Laravel, PHP, React, and Vue.js for modern, high-performance web applications ✔ Scalable, secure, and maintainable architecture designed for long-term success ✔ REST API development, third-party integrations, payment gateways, AI integrations, and automation ✔ Business-focused approach — I understand requirements, recommend practical technical solutions, and help reduce development risks ✔ Clear communication, reliable delivery, and long-term client partnerships ✔ Clean, maintainable code following industry best practices and modern development standards ✔ Ownership mindset — I take responsibility for delivering high-quality solutions, not just completing development tasks 🚀 SaaS Development & Custom Web Applications I specialize in developing secure, scalable SaaS products and custom web applications from concept to production. Whether you need an MVP to validate your idea or a mature platform serving thousands of users, I can architect the solution, develop the backend, create modern responsive interfaces, and integrate the services your business depends on. My experience includes multi-tenant SaaS architecture, subscription billing, Stripe integration, authentication, role-based access control (RBAC), REST API development, third-party API integrations, AI-powered features, dashboards, reporting systems, workflow automation, notifications, background jobs, and performance optimization. Every application is designed to be secure, maintainable, and ready to evolve as your business grows. 🛒 Ecommerce & Marketplace Development I develop custom ecommerce websites and marketplace platforms that go far beyond a standard online store. Whether you're building a B2B portal, multi-vendor marketplace, wholesale platform, or customer ordering system, I create solutions that simplify operations and deliver an excellent user experience. My expertise includes product and inventory management, order processing, vendor dashboards, customer portals, payment gateway integration, shipping integrations, admin panels, API integrations, and business workflow automation. Every platform is developed with performance, security, and future expansion in mind, helping businesses increase efficiency and support long-term growth. 🤝 Let's Build Something Great Together Whether you're starting with an idea, launching an MVP, improving an existing application, or scaling a successful platform, I'd be happy to review your requirements, discuss the best technical approach, and recommend solutions that align with your business goals. If you're looking for a Senior Laravel Developer and Full-Stack Developer who communicates clearly, takes ownership, and delivers reliable, production-ready software, let's connect and discuss how we can build a product that creates lasting value for your business.

Senior AI Engineer with 12+ years of experience building multi-agent AI systems, RAG pipelines, workflow automation, and full-stack SaaS platforms using LangChain, CrewAI, n8n, and OpenAI, delivering scalable, production-ready solutions from architecture to deployment. I personally lead every engagement, backed by a vetted team for when projects need to scale. Across 36 Upwork contracts (with 100% Job Success Score) and 300+ projects throughout my career at AllZone, Fieldforce, Allshore, and AAJ Technologies, I've built systems that ship on time and hold up in production. What I build: → Multi-agent AI systems - LangChain, CrewAI, AutoGen, RAG pipelines, and LLM-powered workflows built for production → Automation infrastructure - n8n, Make, Zapier, and custom integrations that eliminate manual bottlenecks → SaaS backends & APIs - Node.js, .NET, REST/GraphQL, Stripe, and complex third-party integrations → Full-stack web apps - MERN, Next.js, PHP, Laravel, with scalable cloud architecture on AWS and Azure Recent work: → Architected a CrewAI multi-agent system for a patent-pending fintech platform, 330+ hours, 5-star review → Rescued a stalled .NET + Stripe + Persona + Twilio build after the original developer quit, delivered on deadline in 500+ hours, and again, a 5-star review → Built an AI-powered FDA Label Compliance System, automated a regulatory review process that previously required hours of manual work For projects that need dedicated full-stack depth, standalone MERN builds, .NET enterprise systems, or PHP/Laravel backends, my team handles those end-to-end with the same standards and ownership model. Who I work best with: Founders and technical leads who want a senior engineer that communicates clearly, moves fast, and takes full ownership from architecture to delivery. Let’s connect and build something exceptional!

Expert-Vetted (Top 1%) full-stack developer — $1M+ earned across 177 projects. WordPress, WooCommerce, Shopify, and eCommerce are my bread and butter: theme builds, plugin customization, migrations (Webflow-to-WordPress, platform swaps), shipping/payment integrations, and ongoing maintenance. I also build AI agents, RAG systems, and automations (Claude, OpenAI, n8n, Make) when the project calls for it — intake flows, lead triage, support bots, and workflow automation. Recent wins: - Head eCommerce developer for a growing DTC brand - SEO migration from Webflow to WordPress - Recovered 33% of lost Meta conversions for a DTC brand - AI intake flow + EHR integration for a healthcare company - React Native + Node.js full-stack app I work in plain language, move fast, and ship things that actually run in production. Replies within hours.

I’m a Senior AI Engineer with 9+ years of experience building and scaling AI-powered and Voice-enabled products that deliver measurable business results. I focus on integrating proven, cost-efficient AI solutions into existing systems instead of over-engineering from scratch. This helps teams ship faster, control costs, and deploy AI features that work reliably in production. 𝐖𝐡𝐲 𝐀𝐈 𝐚𝐧𝐝 𝐕𝐨𝐢𝐜𝐞 𝐀𝐈 𝐌𝐚𝐭𝐭𝐞𝐫 ● Stay competitive by automating workflows and improving customer interactions ● Future-proof your product with AI-driven features that are becoming standard ● Scale efficiently without increasing operational overhead 𝐇𝐨𝐰 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 Whether you’re building an AI or Voice chatbot, launching an AI-powered SaaS MVP, or enhancing an existing platform with LLM-based features, I can take your idea from architecture to production. 𝐈 𝐛𝐮𝐢𝐥𝐝: ● Clean, intuitive React-based interfaces for web applications ● Secure, scalable AI-enabled backends using Python and Node.js ● Fast, reliable APIs and data pipelines designed for growth 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐀𝐈, 𝐋𝐋𝐌 & 𝐕𝐨𝐢𝐜𝐞 𝐀𝐈 ● LLM integrations, RAG systems, conversational AI ● Voice AI agents using speech-to-text and text-to-speech pipelines ● AI automation, analytics, and intelligent workflows 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 ● Python (Django, FastAPI, Flask), Node.js (Nest.js, Express) ● Scalable APIs, system architecture, and AI integration 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 & 𝐒𝐚𝐚𝐒 ● React, Next.js, modern UI for AI dashboards and SaaS products 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 ● AWS, Azure, Docker, Kubernetes, CI/CD pipelines 𝐑𝐞𝐜𝐞𝐧𝐭 𝐀𝐈 𝐖𝐨𝐫𝐤 ● AI Voice Agent for automated customer interactions ● Healthcare platforms enhanced with AI workflows ● Sports analytics and prediction systems using AI I focus on senior-level ownership, clear communication, and AI solutions that work reliably in production. 💬 Let’s discuss how AI or Voice AI can give your product a real edge.

Stop paying for technical debt - start investing in scalable growth. Most developers can write code, but very few can architect a system that grows with your business. With 12+ years of experience and 200+ successful projects, I bridge the gap between high-end custom engineering (React/Next.js) and powerful enterprise platforms (WordPress/Magento 2). ⭐️⭐️⭐️⭐️⭐️ "Denys is a rare find. He delivered a high-performance architecture that was clean, scalable, and exactly what our business needed to level up. A true partner, not just a freelancer." Why High-Ticket Clients Choose Me: I don’t just "build websites" - I engineer high-performance digital engines designed for maximum ROI. My dual expertise in custom apps and enterprise CMS allows me to solve problems others can't: Custom Product Engineering: Specialized in Next.js and React ecosystems with TypeScript and Tailwind CSS. I build SPAs and Dashboards that are lightning-fast and SEO-optimized by default. Cross-Platform Mobile: Expert React Native development. I create iOS and Android apps that share logic with your web platform, saving you 40% on development time. Enterprise E-commerce: Deep mastery of Magento 2 and WordPress/WooCommerce. I handle complex migrations, custom plugin development, and high-load optimizations. Performance First: My builds don't just work; they fly. I focus on Next.js Vercel deployments, Core Web Vitals, and clean architecture that eliminates future maintenance headaches. 🛠 Technical Ecosystem: Frontend: React.js, Next.js (SSR/ISR), TypeScript, Tailwind CSS, Redux/Zustand. Mobile: React Native, Expo, Mobile App Development (iOS/Android). CMS & E-commerce: WordPress (Custom Themes/Plugins), Magento 2, Shopify, Elementor. Backend & Ops: Node.js, API Integrations, Supabase, Firebase, Vercel. Design to Code: Pixel-perfect Figma to React and Figma to WordPress conversions. 📊 Proven Business Impact: 🔶 Logistics SaaS (Node.js & React): Boosted processing efficiency by 200% and cut manual work by 70% through smart automation. Reduced human error by 50% with an intuitive, custom-built UI using Tailwind CSS. 🔶 E-commerce Scaling (Magento & Shopify): Drove a 15% revenue increase by optimizing performance and UX. Reduced bounce rate by 30% via strategic Next.js implementation. 🔶 Health Tech (React Native): 2x User Retention by redesigning the mobile onboarding flow and performance optimization. 🚀 Why Partner With Me? Senior Authority: 12+ years in the industry. I’ve seen every bug and fixed every bottleneck. Business Mindset: I speak "ROI" and "Conversion," not just "Code." I suggest the best technical path to reach your financial goals. Clean & Maintainable: I write code that other developers love to work with. No technical debt, no spaghetti code. Flawless Communication: Professional project management, clear milestones, and 100% reliability. Looking for a Senior Partner to take your technical vision to the next level? Click the "Invite" or "Hire" button, and let’s discuss how I can help your business grow.