⭐️⭐️⭐️⭐️⭐️ Top 1% Expert-Vetted Web Developer on Upwork 📍 No short-term projects 📞 Kick-off with the team is mandatory 🧨 Available for a quick project start ★ Top-100 Service Provider by Clutch ★ $500M+ Raised by clients ★ 99+ International Awards ★ 15+ years of expertise (NOKIA, OPERA, OPPO, UDEMY, AUTH0, etc.) 👋 Hi, I'm Sergii! I'm a senior web developer, full stack developer Next.js specialist, and front end developer with 10+ years of experience building SaaS platforms, eCommerce products, AI applications, and custom web solutions. Over the years, I've helped launch 100+ products using React, React NextJS, Next.js, and modern JavaScript frameworks. My work combines technical architecture, front-end engineering, and product thinking to create fast, scalable applications that deliver measurable business results. 🏆 Why Clients Work With Me ✔ 100+ React, React Next, and Next.js projects delivered ✔ 50+ fully launched products across SaaS, AI, fintech, and eCommerce ✔ $500M+ raised by companies I've supported ✔ 20+ Upwork clients and long-term partnerships ✔ 30+ Shopify and Shopify Webflow projects completed ✔ Mobile and web products used by thousands of daily users ✔ Extensive experience as a front end developer React and front end Next specialist 🚀 Core Expertise 📌 Front-End Development As a front end developer, front end web developer, and front end designer, I've built interfaces for startups, enterprise products, and high-growth SaaS companies. Using React, React NextJS, Next.js, TypeScript, Tailwind, and modern UI frameworks, I create scalable applications focused on performance, maintainability, and user experience. My front-end work has helped companies reduce load times, improve conversion rates, and accelerate product delivery through reusable component systems and scalable architecture. 📌 React & Next.js Development I've delivered 100+ projects using React, React Next, and Next.js, including SaaS platforms, dashboards, marketplaces, AI tools, and enterprise applications. As a front end developer React specialist and full stack developer Next expert, I focus on building high-performance applications with clean architecture, SSR, SEO optimization, and long-term scalability. 📌 Mobile App Development Beyond web applications, I have extensive experience in mobile app development using React Native. I've helped teams launch mobile apps for healthcare, fintech, logistics, education, and SaaS businesses. As a mobile app developer, I work across the entire product lifecycle—from mobile app design and architecture to deployment and optimization. My experience includes React Native Mobile applications, cross-platform development, and React Native Full Stack solutions connected to modern APIs and cloud infrastructure. 📌 Shopify & Webflow Solutions I've worked on 30+ Shopify and Shopify Webflow projects, helping brands improve storefront performance, customer experience, and conversion rates. As a Shopify front end developer, I build custom themes, Shopify Hydrogen storefronts, and modern eCommerce experiences using Liquid, React, and headless architectures. I also collaborate closely with Webflow teams, helping businesses bridge design and development through scalable Webflow implementations and front-end optimization. 📌 AI & Python Integrations As a front end developer Python specialist, I've worked on AI-powered products featuring OpenAI integrations, vector search, chat interfaces, workflow automation, and custom dashboards. My experience includes Python APIs, automation workflows, AI assistants, and modern SaaS products powered by LLM technologies. 💻 Technology Stack React • React Next • React NextJS • Next.js • React Native • React Native Mobile • React Native Full Stack TypeScript • JavaScript • Node.js • NestJS • Express • Fastify Shopify • Shopify Webflow • Webflow • WordPress MongoDB • PostgreSQL • MySQL AWS • Google Cloud • Azure Tailwind • Storybook • GraphQL • Redux 🔥 What Clients Hire Me For ✔ Front End Developer React projects ✔ Full Stack Developer Next.js applications ✔ React Native Mobile App Development ✔ Shopify Front End Developer services ✔ Webflow and Shopify Webflow implementations ✔ Front End Designer and UI implementation ✔ Front End Developer Python integrations ✔ SaaS platforms and enterprise applications ✔ Mobile App Design and development ✔ Custom Web Development solutions 💎 Why Work With Me I combine the expertise of a web developer, front end developer, mobile app developer, and full stack developer into one delivery process. Clients work with me because I don't just build features—I help create products that scale, perform, and generate business value. Whether you need a front end developer React specialist, Shopify front end developer, React Native full stack engineer, mobile app developer, Webflow expert, or full stack developer Next.js partner, I'd be happy to discuss your project.

⬜️ Full Stack Developer React Node helping SaaS products scale from MVP to 100k+ users ⬜️ React developer available for LONG-TERM partnerships ⬜️ Built 15+ SaaS products with 1M+ combined user actions processed monthly ⬜️ Helped startups reduce infrastructure costs by 35% and improve app speed by 40% ⬜️ Focused on production-ready systems with long-term business value I am a Full Stack Developer React Node who develop full stack applications using modern technologies like React, Next.js, Node.js, and Python. My focus is on building stable, scalable SaaS platforms, business tools, and customer-facing senior web developer applications that work reliably under real-world usage. Who Am I? SaaS Developer ReactJS: ✔️ Full SaaS JavaScript products from idea to production ✔️ User authentication, dashboards, subscriptions, and admin panels ✔️ Multi-tenant systems and scalable backend architecture ✔️ Stripe and payment integrations Web Apps Full Stack Developer React Node: ✔️ Custom web platforms using React and Next.js ✔️ Complex senior python developer dashboards, internal tools, and client portals ✔️ Real-time features using WebSockets ✔️ API integrations with react native developer third-party services Front End React Developer: ✔️ Convert Figma and design files into clean, production-ready frontend code ✔️ Optimize front end developer react performance, loading speed, and overall user experience ✔️ Develop dashboards, SaaS interfaces, admin panels, and client-facing applications Processes: 1st step - Discovery Call 2nd step - Project Roadmap 3dr step - Agreement & Onboarding 4th step - Development & Execution 5th step - Successful Delivery How I work? I focus on writing clean, maintainable code and ux designer backend systems that scale properly. My goal is mobile app developer to build applications that remain stable as user load grows and new features are added. I communicate clearly, meet deadlines react developer, and treat every project as a long-term product, not just a quick implementation. Tech Stack Frontend ◾️React, Next.js, React Native, TypeScript, Redux, React Query, Tailwind, MUI, Mern stack Backend ◾️Node.js, NestJS, Express, Python, FastAPI, REST API, GraphQL, WebSockets Databases ◾️PostgreSQL, MongoDB, Supabase, Firebase, Redis, MySQL DevOps & Infrastructure ◾️Docker, AWS, Vercel, GitHub Actions, Railway Tools ◾️Git, Jira, Slack, Notion, Stripe, REST APIs, third-party integrations I am a full stack developer ( software developer ) who focuses on modern, production-ready stacks and don’t take projects who need wordpress developer, project manager, saas marketing to built with Swift, Angular, Ruby on Rails, WordPress, Laravel vue, PHP, Vue, or Webflow, Seo keyword research, gps, flutter, link building, copywriter, website traffic, etsy marketing 🌶️Got an idea? Let’s bring it to life! Drop me a message, and let’s create something amazing together.

Hi, I’m a Microsoft Certified Power Apps developer and Microsoft dynamics 365 consultant. I have worked on power app portals, microsoft power pages expert, microsoft power pages developer power apps, power automate, power Bi and Business central. As per my past experience I have extensive experience in microsoft power pages. development, customisation and licensing of Microsoft Dynamics 365 product. Microsoft Dynamics 365 and Power Platform Customisation : - Power Apps (Model Driven App, Power Apps Portals, Power Pages, Canvas App) - FetchXML Quarries - Azure B2C - External Entra ID B2C and B2B - API Calls in Portals - Power Automates - Azure Functions - Azure Blob Storage - Power Apps Portals OOB customizations and development - Table permissions, Site settings, User Permission - Portal UI Customization Development experience 4+ years - Asp.net C# MVC framework 2+ years - Microsoft Dynamics 365 CRM 4+ year - Microsoft Power Apps Portals 4+ year - Microsoft Automate 4+ year - Microsoft Power BI 1+ year - Business Central ERP 1+ year - Sharepoint 1+ year I have UI experience more than 3+ years. - HTML5 - CSS - JavaScript - JQuery - Bootstrap - Material UI - Chart.js - AG grid - Angular - Mockup PSD to HTML - Fetch XML - JSON - AJAX - Liquid - Web API - Web Template - Page Template - Web Pages and Web Files

Senior PHP Laravel Developer | 10+ Years Experience with Laravel (4–10), PHP, Vue.js, API Integrations Expert in PHP & Laravel-based development: scalable, secure, and high-performing apps Laravel + PHP are my core tools for building modern web solutions – from startups to enterprise PHP Laravel – my space 🔹 Backend: Laravel (4–10), PHP (OOP), MVC, RESTful APIs, Microservices with Laravel, Laravel Nova, Laravel Forge 🔹 Frontend: Vue.js with Laravel backend, JavaScript, jQuery, Backbone.js 🔹 Databases: MySQL optimized for Laravel, PostgreSQL with Laravel Eloquent, MongoDB, ElasticSearch 🔹 Cloud & DevOps: AWS (S3, SES, EC2, RDS) for Laravel hosting, Docker, Jenkins, CI/CD for Laravel deployments 🔹 Testing & Automation: Cypress, Laravel Dusk, Postman, WebdriverIO, JMeter, Selenium 🔹 CMS & E-commerce: OctoberCMS (Laravel-based), Shopify API, Laravel-integrated Stripe/PayPal solutions From complex Laravel backend systems to custom PHP integrations, I deliver optimized, secure, and scalable solutions. Let’s build something great with Laravel – message me now! 𝐔𝐩𝐝𝐚𝐭𝐞𝐝: April 8, 2025

I have a BTech in Information Management Technology, and i have been programming since 2008. I have worked on and deployed so many software projects, many of which are been used in production environment you can visit my linked In page to see more works that i have done since started working as a professional.

I'm a full-stack developer with 10 years of experience building web applications that solve real business problems. Over the years I've worked with startups, agencies, and established businesses, helping turn ideas into reliable products that people actually use. My work spans both modern web development and AI engineering, helping businesses build intelligent applications powered by Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), and AI agents. I enjoy owning the entire development process—from designing scalable backend systems and APIs to building responsive frontend applications and deploying production-ready solutions. 🚀 What I Can Help You Build Modern web applications with React, Next.js, Node.js, and TypeScript REST APIs, scalable backend systems, and database design AI-powered applications using Large Language Models (LLMs) Retrieval-Augmented Generation (RAG) pipelines over proprietary data AI agents and multi-step workflows for business automation LangChain-based applications and LLM orchestration Fine-tuning open-source models for domain-specific use cases AI integrations that fit naturally into existing products and business workflows I believe good software should be easy to maintain, easy to extend, and built with the end user in mind. My focus is always on writing clean, maintainable code and delivering production-ready solutions. 🛠️ Tech Stack 💻 Frontend React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, Zustand ⚙️ Backend Node.js, Express.js 🗄️ Databases & ORMs PostgreSQL, MySQL, MongoDB, Prisma 🤖 AI Engineering LLMs, RAG Pipelines, LangChain, Agentic AI, Prompt Engineering, Model Fine-tuning, AI Workflow Orchestration 🔌 Tools & Integrations Stripe, Firebase, Google Analytics (GA4), Sentry If you're looking for a developer who can build modern web applications, integrate AI into existing products, or take an idea from concept to production, I'd be happy to discuss your project.

𝗠𝗼𝘀𝘁 𝗯𝗮𝗰𝗸𝗲𝗻𝗱𝘀 𝗮𝗿𝗲 𝗯𝘂𝗶𝗹𝘁 𝘁𝗼 𝘀𝗵𝗶𝗽 𝗻𝗼𝘁 𝘁𝗼 𝘀𝗰𝗮𝗹𝗲. 𝗜 𝗯𝘂𝗶𝗹𝗱 𝗯𝗼𝘁𝗵. I'm a senior backend engineer specializing in Python/Django and AI/RAG systems. I help founders and SaaS teams turn "we want AI in our product" into scoped, shippable features that actually run in production — not just demos. ⭐ Top Rated Plus · 100% Job Success · $55K+ earned · 2,800+ hours ━━━━━━━━━━━━━━━━━━━━ 🎯 𝗪𝗵𝗼 𝗜 𝗛𝗲𝗹𝗽 🔹 Startups building AI products that need a backend engineer who also understands LLMs, vector DBs, and RAG architecture — not just a Python dev forwarding requests to OpenAI 🔹 Founders with a working MVP that needs to scale, and want one developer who'll stay long-term instead of rotating through 5 freelancers 🔹 SaaS teams modernizing legacy Django, Flask, or Rails codebases 🔹 Agencies that need a senior backend lead who can also mentor frontend devs ━━━━━━━━━━━━━━━━━━━━ ⚙️ 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 ✅ Backend Development Python · Django · Django REST Framework · FastAPI · Flask · Celery · Redis · PostgreSQL · MySQL · MongoDB ✅ AI & LLM Integration RAG pipelines · LangChain · LlamaIndex · OpenAI · Anthropic Claude · Vector DBs (Pinecone, Weaviate, pgvector, ChromaDB) · AI Chatbots · Prompt engineering ✅ DevOps & Cloud AWS (EC2, RDS, S3, Lambda) · Docker · CI/CD · GitHub Actions · Nginx · Linux administration · Deployment automation ✅ APIs & Integrations REST · GraphQL · Stripe · Twilio · OAuth/JWT · Webhooks · Third-party API integration ✅ Full-Stack When Needed React · Next.js · TypeScript · Ruby on Rails · Redmine customization ━━━━━━━━━━━━━━━━━━━━ 💡 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 (𝗮𝗻𝗱 𝗞𝗲𝗲𝗽 𝗠𝗲) Most of my Upwork earnings come from long-term clients, not one-off gigs. One client kept me on for 2,800+ hours over 2 years — because the system kept scaling and they didn't want to retrain anyone else. I work like a senior in-house engineer, not a contractor billing hours: → I push back when something is a bad idea, instead of just building it → I write code for the next developer to maintain (often future me) → I tell you about the bug before you find it → I communicate clearly about tradeoffs before I make them → I don't disappear mid-project, ghost on Slack, or hand you AI-generated junk ━━━━━━━━━━━━━━━━━━━━ 📋 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 → Kickoff call to align on scope before I write a line of code → Fixed-price for well-scoped projects · Hourly for evolving work → Async updates so you're never wondering what I'm working on → Response time: within a few hours, every working day ━━━━━━━━━━━━━━━━━━━━ ❌ 𝗪𝗲'𝗿𝗲 𝗽𝗿𝗼𝗯𝗮𝗯𝗹𝘆 𝗻𝗼𝘁 𝗮 𝗳𝗶𝘁 𝗶𝗳: → You're optimizing for the lowest hourly rate above all else → You want someone to copy-paste GPT output and call it AI development → You expect me to skip planning and "just start coding" ━━━━━━━━━━━━━━━━━━━━ 📩 𝗟𝗲𝘁'𝘀 𝗧𝗮𝗹𝗸 If you're building something that needs a senior backend engineer who shows up, communicates, and stays until it actually works in production send me an invite. I'll respond within a few hours with thoughts on your project.

🥇Top 1% UI UX designer & SaaS Designer on Upwork with 8+ years of strategic experience delivering measurable impact through comprehensive SaaS App Design, Web design & Mobile App Design. — Your UI looks boring? — Your UX feels confusing? — Your messy Figma files slowing your team down? Let’s fix that! 👉 Press “𝐈𝐍𝐕𝐈𝐓𝐄 𝐓𝐎 𝐓𝐇𝐄 𝐉𝐎𝐁” or “𝐒𝐄𝐍𝐃 𝐀 𝐌𝐄𝐒𝐒𝐀𝐆𝐄” and I’ll get back shortly. I’m a Top Rated Plus UI UX Designer with 8+ years of experience specializing in UI UX Design for scalable, clean, and user-friendly SaaS, Web Apps, and Mobile interfaces — built for clarity, speed, and smooth developer handoff. I know HTML/CSS and the basics of JavaScript and React — so I speak your developer’s language. My Figma files use advanced Auto-Layout, Variables, and Tokens, making implementation fast and predictable. Being UI UX Designer I provide effective UI UX design solutions which lead to client success across diverse platforms: 🖥 SaaS UI UX Designer Figma, SaaS logo design & SaaS Website designer, Web app & SaaS Designer: as a B2B SaaS designer I improved workflow completion rates and reduced human error in data entry through enhanced UIUX design. As a SaaS UX designer, I build structured UX B2B dashboards, CRM, and ERP systems using Figma prototyping, scalable UI kits for handoff to Flutter developer, Webflow and React teams. 📱Web Designer & Mobile App Designer: acting as figma mobile app designer - boosted overall user stickiness and monthly active users by redesigning the mobile app UI and streamlining the onboarding user journey. I design FinTech, crypto UI UX and Web3 and my workflow integrates Figma to HTML and Figma to Webflow transitions. In Healthcare & Wellness domain I focus on mobile UI UX for HealthTech, EHR systems, and wellness platforms using user-centric design and rapid prototyping in Figma, Sketch, and Adobe XD. 🛍️ UX UI Designer Ecommerce UX, Product Designer & Website Design Optimization: as a full-stack website designer for high-converting platforms for ecommerce ux. Shopify UI UX and Wix website designer custom builds help reduce bounce rates by an average of 25%. I do responsive UI UX design for WordPress and modern interface work like Flutter UI UX for high-performance ecommerce ux web design & figma mobile app design. As a Shopify UI UX and Webflow designer, I build responsive, conversion-optimized website design, Wix website design, and WordPress landing pages, applying branding assets created in Illustrator and Photoshop directly into UI components. 🫟 Branding Design, SaaS Branding, Website branding, Brand Guide, Logo Design, Game UI, Graphic Design & Motion designer: as a dedicated UI/UX graphic designer, ui artist, web designer and UI designer, I've launched unique digital brand identities (including SaaS logo design and mobile app logo design). I also specialize in crafting engaging UI animation and interfaces for projects. 📝 UX/UI Design, Accessibility, and Developer Handoff: as a UI/UX designer and UX researcher delivered over 5000+ wireframes & mockups and 150+ high-fidelity prototypes, as well as provided uiux designer services with making the web design ready for development with components from tailwind ux ui libraries, react, shopify and flutter. UI/UX Design which complies with WCAG standards for accessibility, utilizing components from modern UI libraries like Tailwind UI UX, React, Shopify, and Flutter. 💡UI/UX Design, Mobile App design, SaaS Design, eCommerce UX, Landing Page design, Figma and Web Design Process ✔️ Discovery & UX Research: as UX/UI designer, Figma designer & UX researcher I start every project with strategic UX research, competitor analysis, and stakeholder interviews to define user needs, business goals, and KPIs. ✔️ Strategy & Architecture: as a UI UX designer Figma I build scalable user journey maps, UX flows, and site architecture for websites, web apps, or eCommerce UI/UX. This supports platforms ranging from Shopify UI UX to SaaS product design. ✔️ Wireframing & Prototyping: as Figma designer using Figma and mobile Figma design, I create low- and high-fidelity wireframes and interactive prototypes in Figma for early validation, ideal for web design, mobile UI UX and Flutter UI UX development. ✔️ UI Design: I craft modern, accessible interfaces as a web designer, graphic designer, and product designer. My work often includes scalable design systems, UI kits, and brand guidelines, supporting Webflow, WordPress, Wix web design, and eCommerce UX. ✔️ Handoff & Support: clean UI/UX handoff with pixel-perfect assets and documentation, ensuring smooth collaboration with Flutter developer, Webflow developer or Shopify UI UX teams. Whether it’s a SaaS dashboard, mobile app, or trading website UI. Let's transform your idea into an industry-leading product TODAY. 🛎 Press "𝐈𝐍𝐕𝐈𝐓𝐄 𝐓𝐎 𝐓𝐇𝐄 𝐉𝐎𝐁" and let’s schedule a quick chat!

🏆 Top-Rated Plus Freelancer on Upwork ✅ 100% Job Success Score ⭐ 5-Star Client Reviews ⭐ 8+ years of experience I am a professional Full-Stack PHP developer almost having more than 8+ years of experience. we are passionate about programming and developing new systems with full guaranteed accuracy and strictly bound to deadlines. I have also experience with multiple frameworks and software development with database administration. We provide web design and development, E-commerce solutions. We are completely committed not only to provide basic services but also doing everything possible to get your business growing explosively. We will provide you with a great solution as per your expectations. - OUR SKILLS - : ● PHP ● Laravel ● Codeigniter ● WordPress ● Shopify ● Bootstrap3/4, SASS/SCSS, Html, Jquery, Javascript ● MySQL, OOPs, Git - Web Development Skill - : ● Web Development ● API development with integration ● Shopify Theme Customization ● Shopify Product Migration ● Shopify Store - Cloud Services - : ● Amazon AWS ● Google Cloud Platform (GCP) ● Heroku ● Firebase ● MongoDB Alta ● Digital Ocean ● GitHub / GitLab / BitBucket ● Docker It's always a pleasure working with us as we provide: - 100% productivity - Regular communication - Satisfaction Guarantee - Fast Delivery

🥇 EXPERT-VETTED 🥇 With a decade of experience as a PHP Developer, Laravel Developer, WordPress Developer, and Full Stack Developer, I have successfully delivered 100+ projects with outstanding client feedback. I help businesses build scalable web applications, custom SaaS platforms, and high-performing WordPress solutions while staying ahead of emerging technologies. I take pride in 📈 developing scalable and high-performance Laravel applications, specializing in maintainable, secure code and seamless integrations. This dedication, verified by my long-standing freelance status, places me in the 🥇 top 1% of expert-vetted developers with more than ten thousand logged hours. Quantifiable Achievements: ⚡ Performance As a Laravel Developer and PHP Developer, database query and caching optimizations cut Laravel app load times by 50%. Using Redis, OPcache, and Eloquent query enhancements, doubled PHP web application speeds. Optimized Laravel API efficiency, resulting in a 60% decrease in API response times through rate-limiting and query enhancement. E-commerce platform optimization on Laravel led to checkout abandonment dropping by 35% and revenue climbing by 20%. 🛡️ Code Quality Reduced technical debt by 40% through codebase refactoring, boosting maintainability as Web Developer and Laravel Developer. Achieved 90% unit test coverage with PHPUnit and Pest, minimizing production errors. Automated CI/CD pipelines and testing reduced change failure rates to below 15%. ☁️ Infrastructure Serverless solutions and scalable cloud setups cut Laravel hosting expenses by 30%. Introduced failover and database replication, reducing server downtime by 60%. Via CI/CD, Laravel Forge, and Envoyer, increased deployments by 30% as Full Stack Developer and Laravel Developer. Core Competencies: 💻 Full Stack Development: Building custom Laravel apps, SaaS platforms, and backend systems using Laravel’s robust toolset as Laravel Developer, PHP Developer, and Full Stack Developer. 🔗 APIs: Design of RESTful APIs supporting scalable integrations with CRMs and payment gateways. 🎨 Frontend: Responsive interfaces via VueJS and ReactJS, focusing on progressive and single-page applications as Vue Developer. 🌐 Custom Platforms: Development covers CRM, management tools, healthcare platforms, and dashboards. Technical Proficiency: Laravel | PHP | REST API | SaaS | Multi-Tenancy | Laravel Livewire | Vue Developer | WordPress Developer 💾 MySQL/PostgreSQL/NoSQL 📜 Ajax, JavaScript (Vue.js, ReactJS), TypeScript, jQuery 📐 HTML, CSS, Bootstrap 🔍 Redis, Elasticsearch Specialised Offerings: 🤖 Automation & API Integration 🚀 Custom Laravel/React Solutions 💳 Payment Integration (Stripe) 🤖 ChatGPT & AI Integration 🏎️ High-performance Optimisation 🛍️ Shopify Customisation & Development 🚚 Delivery/Logistics Apps Industries Served: 🏢 SaaS & Multi-Tenant Solutions 🚚 Fleet & Logistics 🩺 Healthcare 💰 FinTech 🛒 Ecommerce From Laravel-powered backends to VueJS-powered frontends, I cover comprehensive development services. As a WordPress Developer, Vue Developer, Laravel Developer, and Web Developer, my solutions are built for scalability and durability. 🤝 Contact me for a consultation. Let’s discuss your requirements and set a solid development strategy. Updated: 16.06.2026