I'm Costel, a seasoned Expert Full-Stack Developer with 20 years of experience and a Master’s in Computer Science, specializing in Custom Web Applications and WordPress. My expertise encompasses a broad range of solutions, including bespoke web applications, CMS, ERP systems, API development & integrations, e-commerce, as well as comprehensive WordPress front-end and back-end services. My approach prioritizes quality, performance, and scalability, ensuring each project not only meets but exceeds expectations. My expertise includes: - Custom web applications using Laravel, PHP/MySQL/HTML/CSS/JS (I've developed tens of custom complex systems eg: order management systems, production planning/tracking, invoicing, inventory management, email marketing solutions, job listings, medical platforms, web portals, etc.) - CMS / ERP systems - API development & integrations - WordPress bespoke themes, plugins, customizations - WooCommerce & Prestashop e-commerce solutions - Websites speed optimizations I ensure lightweight, robust solutions, optimized for speed and SEO, tailored to drive results and conversions. My commitment is reflected in my Upwork success, with a record of high ratings and client satisfaction, representing a recent yet significant part of my extensive career. What sets me apart? - Exceptional communication, projects/task understanding, always bringing innovative ideas and solutions - High-quality delivery, minimizing revisions and bugs - Reliability in meeting deadlines, with a well-organized approach - Passion and dedication to every project, ensuring 100% commitment - Agility and flexibility, adapting to the dynamic nature of software projects I’m here to make sure your project thrives, countering the industry’s trend of delays and budget overruns. Partner with me for a seamless, successful development experience.

🚀 Building AI-Powered SaaS & Automation Systems That Drive Real Business Results Most developers build features. I build systems that reduce costs, automate workflows, and scale your business. If you’re a founder, startup, or business looking to build an AI-powered app, SaaS product, or automation system — I can take your idea from concept to a production-ready platform. I’m Arko, a Full Stack AI Engineer focused on building modern, scalable, and revenue-generating systems using Next.js, LLMs, and automation tools. 💡 What I Build 🤖 AI & Automation Systems • OpenAI / GPT / LLM integrations • AI chatbots & internal tools • Retrieval-Augmented Generation (RAG) systems • AI document processing & analysis • Content & social media automation • Custom workflow automation systems 🧠 SaaS & MVP Development • Multi-tenant SaaS architecture • Authentication (NextAuth / JWT / Clerk) • Subscription systems (Stripe) • Role-based dashboards & admin panels • Scalable backend & production deployment ⚡ Frontend (High-End UI) • Next.js (App Router) • React + TypeScript • Tailwind CSS (clean, modern UI) • SEO optimized & high-performance apps 🔐 Backend & Infrastructure • Node.js / Express • PostgreSQL / Prisma / MongoDB • REST & GraphQL APIs • AWS / Vercel / Docker • CI/CD pipelines ⸻ 🏆 Why Clients Work With Me ✔ I think like a product owner, not just a developer ✔ I build scalable systems — not quick fixes ✔ I focus on clean, maintainable architecture ✔ I understand business logic & automation deeply ✔ Fast communication & reliable delivery ⸻ 💬 Client Feedback “Arko is a rare gem… excellent at both design and development. He delivered a full website in under two weeks and exceeded expectations. Highly recommended.” ⸻ 🎯 Best Fit Clients • Startup founders building MVPs • Businesses automating operations with AI • SaaS companies scaling their platforms • Agencies needing high-end development support ⸻ 📈 What Makes Me Different I don’t just write code. I build systems that: • Save time through automation • Reduce operational costs • Improve efficiency • Scale with your business ⸻ If you’re building something serious — send me a message. Let’s make it happen.

Web developer with 10+ years of professional experience, successfully freelancing for over seven years. I use Python and Django for most of my work. I have also worked extensively with WordPress in the past, though I rarely do so now. Backend work is my primary focus (API, DB, application logic, CI), but I'm also adept at frontend tasks. When it comes to desktop apps, C# is my language of choice for Windows and Java for cross-platform apps. In all of my projects I put code quality very high on my list of priorities, as well as following standards and best practices. "Readability counts"

🚀 Top Rated Plus | WordPress, SEO & Speed Optimization Specialist Need fast fixes, better performance, or launching a new site? I help business owners and agencies fix, optimize, and launch high-performing WordPress websites — fast. With 10+ years of experience, I specialize in: ✅ Full-Stack WordPress Development ✅ Front-End Optimization & Speed (Core Web Vitals) ✅ On-Page SEO & Technical Audits ✅ Page Builders: Elementor, Divi, Beaver Builder, WPBakery, and much more! ✅ WooCommerce Setup & Performance ✅ Google Tools (Analytics, Search Console, Tag Manager) ✅ Hosting Transfers, SSL, DNS, and Server Tuning 🔧 Tech Stack & Toolbelt: - WordPress, PHP, JavaScript, HTML, CSS, jQuery, MySQL - Servers: Apache, NGINX, LiteSpeed - Tools: Screaming Frog, Ahrefs, SEMrush, Moz, GTmetrix - CDNs: Cloudflare, KeyCDN, Amazon CloudFront - Email & DNS: G Suite, Zoho, MX Records, SPF/DKIM - Migration Tools: All-in-One WP Migration, Duplicator, UpdraftPlus 💡 Example Results: ✔️ Cut load time from 7s to under 2s for an eCommerce site ✔️ Recovered SEO traffic after a failed migration ✔️ Boosted mobile PageSpeed score from 42 to 91 in 3 days 🤝 You’ll get: - Clear communication (weekly updates, Loom videos on request are available) - Results-backed recommendations, not just code - Fast turnaround and long-term reliability 📩 Let’s talk! Send me a quick message about your project — I’ll provide next steps and a clear action plan.

Tech virtuoso with a knack for both sides of the digital coin. As a Full Stack Developer, I'm the wizard behind the web, blending artful design with powerful functionality. I breathe life into pixels, crafting seamless user experiences that leave jaws dropped and clicks skyrocketing. With a command of multiple programming languages, frameworks, and databases, I'm a master of code orchestration, weaving together front-end magic and back-end wizardry. From crafting captivating interfaces to architecting scalable server infrastructure, I'm the driving force behind cutting-edge digital solutions. Ready to revolutionize the online realm? Let's build the future together. I am a full-stack developer with more than 11 years of development experience, including all programming language skills. I developed many websites, window-based software, mobile applications, websites, and mobile designs during the development period. In my 11 years of experience, I did work on the following technologies - Web/Desktop Programming (C#, MVC, VB.NET, PHP, Python, Java) - Databases Management (MySQL, Microsoft SQL, Oracle, MongoDB, SQLite) - Web Designing (HTML, HTML 5, bootstrap, CSS3, and Material Design for Bootstrap) - Front-End Development (Javascript, JQuery, NodeJS, React, ReactJs, React Native, VUE Js, Angular and AngularJS) - Azure DevOps - Data Analyst - Semantic Web (RDF, SPARQL, Protégé, WebProtégé, GraphDb, Apache Fuseki, Apache Jena, Jypyter lab and notebook, RDFLib and everything) - Setup the Shopify Store with your domain integration I am a good critical analyst to grab the requirements very quickly because I did PhD in computer science, so I know how to tackle complex and big problems. I prefer to do software development projects task using the agile software model.

🙋I'm a highly skilled React.js/Next.js Developer, proficient in Front-End and Full-Stack development. My expertise spans across the MERN stack, enabling me to craft top-notch websites and apps. Passionate about creating elegant, intuitive, and scalable solutions, I specialize in leveraging React.js, Next.js, Node.js, ReduxToolkit, TypeScript ,React-Query, and MongoDB ,Express.js, Prisma, PostgreSQL to meet the dynamic needs of modern businesses. I thrive on building high-quality, user-centric applications that elevate user experiences and drive success. work with UI libraries like Material UI, ShadCn-UI, Tailwind CSS, Chakra UI, and Ant Design, ensuring not just a website, but a stunningly attractive, lightning-fast, and secure digital masterpiece. 🚀 Get ready for a transformative experience! ✨ Here's what you'll receive: ✔️ Fortified, impenetrable websites/apps ensuring total security ✔️ Lightning-fast loading speeds for boosted conversion rates ✔️ Seamlessly responsive, mobile-friendly products for all devices ✔️ A 100% Guarantee of absolute satisfaction ⚒ Ready to elevate your online presence? Hire me for expert development of your online store or website, coupled with ongoing maintenance. I take immense pride in my craft and always honor the time and dedication invested in my work! 🏅 **Skills Showcase** 🏅 ✅ **React**: Crafting dynamic and responsive web applications with React. ✅ **Next.js**: Crafting dynamic and responsive web applications with Next.js. ✅ **JavaScript**: Expert in JavaScript. ✅ **TypeScript**: Harnessing the power of static typing for robust codebases. ✅ **Redux** and ** Redux-toolkit**: Mastering state management for complex applications. ✅ **Redux Form**, ** ** and **Redux Thunk**: Seamless form handling and asynchronous operations. ✅ **CSS & Sass**: Creating stunning and stylish user interfaces. ✅ **HTML5**: Structuring web content for maximum impact. ✅ **React Bootstrap**: Enhancing UI/UX with responsive design. ✅ **JSX**: Transforming concepts into interactive components. ✅ **SCSS**: Elevating the aesthetics of your applications. ✅ **Node.js**: Building scalable server-side solutions. ✅ **PostgreSQL**: Building scalable Database solutions. ✅ **Express.js**: Crafting fast and efficient APIs. ✅ **Axios**: Reliable HTTP requests for seamless data retrieval. 🏅 **Component Library Mastery** 🏅 ✅ **Chakra UI**: Elevating aesthetics with this modern UI framework. ✅ **Material UI**: Bringing Google's design philosophy to life. ✅ **Tailwind**: Streamlining UI development with utility classes. ✅ **Ant Design**: Crafting beautiful and efficient UIs with ease. ✅ **Bootstrap**: The classic framework for sleek design. ✅ **Semantic UI**: Creating intuitive and responsive interfaces. 🏅 **3rd Party Library Wizardry** 🏅 ✅ **Lodash**: Harnessing utility functions for streamlined development. ✅ **Moment.js**: Handling dates and times like a pro. ✅ **RxJS**: Managing asynchronous data flows efficiently. 🏅 **Other Essential Tools** 🏅 ✅ **Postman**: Ensuring API functionality and reliability. ✅ **Git, Github, GitLab, Bitbucket**: Version control and collaboration expertise. 🏅 **Other Essential Teck stack for MERN ** 🏅 ➳ Custom WordPress Theme ➳ Webflow development (websites and web apps); ➳ Website development from scratch; ➳ Figma to WordPress ➳ Figma to Next.js ➳ Figma to React ➳ Express.js ➳ MongoDB ➳ PostgreSQL; ➳ SaaS applications; ➳ NFT websites; I have worked with many clients from many sectors like Health and Beauty, Fashion, Clothing, the Food Industry, Jewellery, Drinks and Beverages,, Sports, Kids, Electronics, etc. My colossal experience allows me to ask the right questions and do what the client needs based on the answers! I have a beautiful smile and good communication skills :) Keywords you can find me: Redux, Firebase, React,Next.js, Hook Form, TypeScript, TailwindCSS, Storybook, Atomic Design, Formik, MUI, RESTful API, Migration, Landing Pages, Gutenberg Blocks, WP Blocks, Elementor, Elementor Addons, WP Bakery, Divi, Contact Form 7, Gravity Forms, Gravity Forms Pro, Redux Framework, WooCommerce, Woocommerce Stripe Payments Gateway, Smooth Scrollbar JavaScript Plugin, Three.js, Fullpage.js custom carousel, marquee animating, No Code, Webflow components, Webflow interactions, Webpack, npm, yarn, API, WordPress Website Development, Bug Fixing, Quick Fixes, PSD to HTML, Figma to HTML, Coming Soon Page Development, Landing Page Development, Bespoke WordPress Theme Development, E-commerce Development, Woocommerce Development, Page Speed Optimisation, Website Hardening, Website Maintenance. 📩 Feel free to reach out and let's embark on this exciting journey together. Warm Regards, Santosh Maurya

🌟 Expert-Vetted Talent - Recognized in Upwork's top 1% of Talent ✅ Established Track Record of Hours and Earnings 🚀 Fastest Response Times 💯 100% Job Success Awarded by Clients 🔝 Top Rated Plus by Upwork, Freelancer and Agency 🔎 Searching for New Opportunities and Problems to Solve Hello and welcome, thank you for considering me for your project. My Upwork profile’s stats clearly demonstrate both my expertise and the value I add to every team that brings me on. The thousands of hours clocked on this platform alone speak to my years of experience in Software Development, and the total earnings shows a glimpse of how valuable that time has been for clients. I am available and ready to answer specific questions about your project’s current problem, next opportunity, or my fit for it. Shall we get to work? Send a message or an invite now and I will be right with you. 𝐖𝐡𝐲 𝗖𝗹𝗶𝗲𝗻𝘁’𝘀 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: 1. 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗮𝗻𝗱 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Decades of experience bring a deep understanding of various languages, frameworks, platforms and tools, common and uncommon pitfalls, and alternative solutions. 🗯️ “He was very responsive to our messages and explained what was needed in our project clearly. He is definitely an expert in his work.” 2. 𝗘𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝗼𝗹𝘃𝗶𝗻𝗴: I have a proven track record and knack for solving complex problems and providing customized solutions for specific business needs and challenges. 💭 “Isaac was able to quickly discern what I needed and delivered…” 3. 𝗦𝘆𝘀𝘁𝗲𝗺 𝗩𝗶𝗲𝘄 𝗮𝗻𝗱 𝗖𝗼𝗺𝗽𝗿𝗲𝗵𝗲𝗻𝘀𝗶𝗼𝗻: Years of experience and diverse projects have helped me accumulate a broad set of skills and tools. I use this experience to the advantage of my client’s projects in not only accomplishing tasks, but in advising and consulting on potential challenges and opportunities. 💬 “LIFE SAVER!!! I have now use(d) Issac for two separate jobs now and will be bringing him on for some regular hours. Hopefully we get some funding and I can do even more with him. GREAT DEVELOPER” 𝐌𝐲 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Python|Django|PHP | MySQL | Laravel | WordPress | CodeIgniter | ExpressionEngine | CSS | HTML | JavaScript | Express.js | React.js | Bootstrap | PostgreSQL | NoSQL | Linux | Apache | Nginx | API | Git | SVN | Amazon Web Services | AWS EC2 | 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝗜 𝐎𝐟𝐟𝐞𝐫: 𝐅𝐫𝐨𝐧𝐭 𝐚𝐧𝐝 𝐁𝐚𝐜𝐤-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Planning, Design, Documentation, Coding, Testing, Debugging, Deployment, Monitoring, and Maintenance. 𝐒𝐲𝐬𝐭𝐞𝐦 𝐀𝐝𝐦𝐢𝐧𝐢𝐬𝐭𝐫𝐚𝐭𝐢𝐨𝐧: Cloud infrastructure Design, Deployment, Optimization, Maintenance, Scaling, Recovery and Backup, Troubleshooting, and Cost Management. 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 Management: Architecting, Optimization, Monitoring, Recovery, Updating, and Merging. 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: Planning, Project Requirements, Task Detailing, Developer Support and Feedback, Problem Resolution, Progress Monitoring, Qualification Testing, and Stakeholder Communication.

🏆 Top Rated Plus | 8+ Years | 260+ Shopify Stores Delivered | 98% Job Success Score Hi, I'm Deepali I'm a Shopify developer with 8+ years of experience and have worked on 260+ Shopify stores for brands across different industries. I help businesses build, improve, and scale their online stores with clean development, thoughtful design, and a practical approach. Whether you're starting from scratch, redesigning an existing store, migrating from another platform, or adding custom functionality, I can help you get it done efficiently. I regularly work on: - Shopify store setup and development - Custom Shopify themes and Liquid development - Theme customisation and bug fixes - Figma to Shopify implementation - Shopify redesigns and UX improvements - Product pages and landing pages - Speed optimisation and Core Web Vitals - Shopify SEO fundamentals - App integrations and custom features - Metafields and custom sections - Store migrations from WooCommerce, Magento, and BigCommerce - Ongoing maintenance and support I believe in clear communication, realistic timelines, and building stores that are easy to manage after launch. If you're looking for someone who can take ownership of your Shopify project and deliver quality work, I'd be happy to chat. Have a Shopify project in mind? Hit "Invite" or book a free consultation. _____________________________________ Keywords: Shopify Expert, Shopify Developer, Shopify Designer, Shopify Store Developer, Shopify Store Designer, Shopify Website Developer, Shopify Website Designer, Shopify Development, Shopify Store Design, Shopify Website Design, Shopify Store Setup, Shopify Store Redesign, Shopify Website Redesign, Shopify Theme Developer, Shopify Theme Designer, Shopify Theme Development, Shopify Theme Customization, Shopify Custom Development, Shopify Customization, Shopify Liquid Developer, Liquid, Shopify Plus, Shopify Plus Developer, Shopify Consultant, Shopify Partner, Ecommerce Developer, Ecommerce Website Development, Shopify Frontend Developer, Shopify Backend Developer, Shopify API, Storefront API, Admin API, Shopify Metafields, Shopify Flow, Shopify Functions, Headless Shopify, Hydrogen, Shopify Speed Optimization, Core Web Vitals, Shopify Performance Optimization, Shopify SEO, Technical SEO, Structured Data, Schema Markup, Conversion Rate Optimization, CRO, Shopify UX, Shopify UI, Mobile Responsive Design, Responsive Web Design, Shopify App Integration, Custom Shopify App, Private App, Public App, Klaviyo Integration, Recharge Integration, Subscription Setup, Payment Gateway Integration, Shipping Setup, Product Page Design, Landing Page Design, Custom Sections, WooCommerce to Shopify, Magento to Shopify, BigCommerce to Shopify, Shopify Migration, Data Migration, CSV Import, Figma to Shopify, PSD to Shopify, Adobe XD to Shopify, Shopify Maintenance, Shopify Support, Shopify Bug Fixing, Shopify Troubleshooting, D2C Ecommerce, B2B Shopify, Wholesale Shopify, Online Store 2.0, Dawn Theme, Shopify OS 2.0

Senior Full Stack Developer with 10+ years of experience in Laravel, Vue.js, React, and React Native. I build scalable SaaS and B2C platforms used by 10,000+ users in Europe. If you are building a SaaS platform, B2C mobile app, or multi-tenant system, you need more than just code. I deliver scalable architecture, clean implementation, and product-focused solutions. Proven results: - Built a multi-tenant SaaS platform serving 3,000+ users across 15+ tenants - Developed a React Native mobile app used by 10,000+ individuals - Improved employee productivity by 20% with a corporate assessment platform - Built high-performance eCommerce platforms for European markets - Increased operational efficiency by 70% with digital management tools Core expertise includes: - Backend: PHP, Laravel, MySQL, REST APIs, multi-tenancy - Frontend: Vue.js, React, TypeScript, Inertia.js, Livewire, Alpine.js, Tailwind CSS - Mobile: React Native (iOS & Android) - Infrastructure: Docker, CI/CD, GitHub workflows, production-ready deployments What makes me different: - Product-focused mindset, not just task execution - Experience with European quality standards - Long-term project ownership - Clean, maintainable, scalable code - Strong English communication Ideal projects: - SaaS platforms - Subscription systems - Multi-tenant applications - B2C mobile apps - Marketplaces - Enterprise dashboards If you're building something serious and want it done right the first time, let’s discuss your project.

Expert in Python, Nodejs, ReactJS, Angular, AngularJS, PHP/Laravel, HTML, CSS, Bootstrap & Javascript, RESTful services / APIs, etc. I can also create Ionic Angular Webapp, Mobile APPs. I am 8.5 years experienced LAMP Developer. You can see my old work and feedback of my clients. I am delivering 100%. I have adopted a very basic but the most important way of developing the applications through the system development life cycle. I don't do different things but do them in a different manner. I apply different software development models according to the need of the application. Top Skills are: - Python, PHP, MySQL, PgSQL, MongoDB, OOPs in PHP5-Core PHP - PHP Frameworks: Laravel 8, CakePHP3.x, Yii1 &2, Codeigniter, Zend - Angular(1-8), Angular JS, NodeJS, VueJS, - AJAX, HTTP, SMTP, SSH, AWS ec2 server using Ubuntu - Payment-gateway-integration: Paypal, Stripe, Paytm, Authorized.net - SMS API - Twilio - Integrate recurring payment, Bash-shell-scripting - JSON / Restful API / XML / SOAP / GraphQL - Social networks API: Facebook, Twitter, LinkedIn, etc. - Bootstrap, Flexbox- Responsive sites - Trello, JIRA, Basecamp etc Project management tool expert. - SVN, Bit-bucket & GITHUB - HTML5 / CSS3 / LESS / SASS - JavaScript / ES6 / Typescript - CMSs: Wordpress, Woo-commerce, Shopify 8 Years of IT Industry and top decision maker in several popular IT projects globally. ✅ Top rated Plus badge (Top 3%) awarded by Upwork for the excellence of the work ✅ Close to 12,000+ Hours on Upwork ✅ Worked with Fortune 500 Companies ✅ Complete System architect for 100+ projects ranging from enterprise to medium grade. ✅ Master in server-less infrastructure and micro-services architecture. I have a 100% success rate for all my projects and will be available more than 40 hours per week and able to start your project as soon as possible according to you. My response time is less than 1-2 hour. Please check my Portfolio here and also check Client's feedback for the projects completed by me.