Top Shopify Developer & Ecommerce Designer | Shopify Stores That Look Premium & Convert Your Shopify store should do more than just look good — it should build trust instantly, guide customers smoothly, and turn visitors into buyers. That’s exactly what I help brands achieve. I specialize in designing and developing high-converting Shopify stores for modern ecommerce brands across fashion, beauty, wellness, food, lifestyle, and premium consumer products. Whether you need a full storefront redesign, conversion optimization, custom Shopify sections, or a cleaner mobile experience, I focus on creating stores that feel polished, fast, and built for growth. What I can help you with: • Shopify Store Design & Development • Theme Customization (Focal, Dawn, Prestige, Shrine, Nimbus & more) • Conversion-Focused Homepage & Product Pages • Custom Shopify 2.0 Sections • Mobile Optimization & UX Improvements • Bundles, Upsells & Cart Optimization • Speed Optimization & App Integrations • Landing Pages & CRO Improvements • Clean, Modern, Premium Ecommerce Design Why clients work with me: ✔ Clean, conversion-focused design approach ✔ Strong understanding of ecommerce sales psychology ✔ Detail-oriented development with safe, scalable coding ✔ Fast communication & reliable project delivery ✔ Focus on long-term growth, not quick fixes I don’t just customize Shopify themes — I help brands create ecommerce experiences that feel trustworthy, premium, and easy to buy from. If you’re looking for a Shopify expert who understands both design and conversions, let’s build something that actually grows your business.

Experienced Web & eCommerce Developer | Magento | WordPress | Shopify | Custom Applications. 🔹 16+ Years of Expertise in Web Development, eCommerce, and Custom Applications 🔹 Certified RHCE & AWS/DigitalOcean Expert – Secure, Scalable, and Optimized Solutions 🔹 Full-Stack Development – PHP, MySQL, Open Source Technologies, and Cloud Hosting What I Offer: ✅ eCommerce Development – Magento, Shopify, WooCommerce, and Custom Solutions ✅ WordPress & Elementor Pro – Custom Themes, Plugins, and Performance Optimization ✅ Web & Application Development – ERP, CRM, Portals, and Scalable Business Solutions ✅ IT Consulting & Technical Support – Server Management, Cloud Hosting, and Security ✅ Team & Project Leadership – 3+ Years Leading Development Teams I specialize in debugging complex issues and providing long-term support for eCommerce stores and custom projects. My workflow includes staging environments for smooth development, ensuring minimal downtime and seamless updates. Let’s collaborate to build and scale your business with reliable, high-performance solutions. 💡 Ready to discuss your project? Let's connect!

I’m Katherina, a UI/UX Designer and Account Manager at NetzOptimize Inc. I work closely with our engineering and QA teams to create intuitive, visually refined, and user-centered digital products. My focus is translating ideas into thoughtful, functional interfaces that elevate usability, accessibility, and brand consistency across web and mobile experiences. In my account management role, I serve as the bridge between clients and our technical team. My priority is to ensure clear communication, aligned expectations, and a smooth, well-structured process from concept to launch. I am committed to making the development journey feel organized, collaborative, and grounded in your goals. Core Skills UI/UX Design, Wireframing and Prototyping Responsive and Accessible Interface Design Web and Mobile Development (MERN, MEAN, React Native) Backend: Node.js, Python, PHP, Laravel Cloud: AWS (Lambda, EC2, S3, RDS) Databases: MySQL, NoSQL, Firebase API Integrations (Twilio, Mapbox, Google Maps) Version Control (Git, SVN) Tools I Use Figma, Sketch, Adobe XD, Adobe Creative Suite, InVision, ProtoPie, Axure, HTML, CSS, JavaScript, React, Vue, Angular, TypeScript, Jira, Trello, Slack What I Bring to Every Project End-to-end support for web and mobile development Modern, scalable solutions using industry-leading frameworks AI-enhanced product experiences including GPT-4 integrations Clear and collaborative client-centered project management Consistent, high-quality execution from start to finish If you are looking for a designer and account partner who blends creativity with structure and who can guide an idea all the way to a polished, functional product, I would be happy to connect. Katherina (Kat)

I am a Full Stack Developer, knowledgeable and have experience with computer languages/technologies like PHP, JavaScript/TypeScript, NodeJs, MySQL, HTML, CSS and frameworks like Laravel/Lumen, Magento, Angular, Bootstrap and other more. I can do my work effective and fast, while also following the standards and considering the well being of my other teammates. I always make sure that my work is not just working but it is effective, efficient and optimized as well. Summary of Skills: - PHP5/7 applications and CMS (Magento, Wordpress) - HTML/CSS/Bootstrap responsive layouts - JavaScript development (Native/Node.js/Angular/React/TypeScript) - E-commerce development (Magento) - SQL/NoSQL databases - Amazon Web Services/Google Cloud Platform - Agile/CI-CD/DevOps development practices/Serverless - WebAPI development (REST/SOAP) - Wordpress Development - Minimal Experience with .Net Core 6 - Minimal Experience with GraphQL List of professional works I've done: - E-commerce website using Magento and Laravel/Lumen - Connected services app using Node.Js - Benefits and referral program using Node.Js - Airline ground ops application using Node.Js - Sports app and site using Wordpress

I specialize in building AI-powered applications and autonomous agents that automate workflows, analyze data, and help businesses move faster using modern LLM technologies. Using tools like LangChain, OpenAI, Claude, Ollama, and FastAPI, I develop intelligent systems that can reason, retrieve knowledge, and perform real-world tasks. I help startups and companies build AI products, internal AI tools, and SaaS platforms powered by LLMs and automation. What I Build AI Agents that automate complex workflows RAG systems for knowledge-based AI assistants AI chatbots for customer support and internal tools AI SaaS products and MVPs Document processing and AI data extraction systems AI workflow automation for business operations AI & LLM Expertise LangChain / LangGraph agent systems OpenAI API integration (GPT models) Claude API integration Ollama for local LLM deployment Retrieval Augmented Generation (RAG) Vector databases (Pinecone, Weaviate, FAISS, Chroma) Prompt engineering and tool-calling agents Backend & AI Infrastructure Python (FastAPI, Django, Flask) LLM application architecture API development and microservices Event-driven backend systems Workflow automation systems Frontend & Product Development React / Next.js AI dashboards and user interfaces Real-time AI interaction systems Databases & Data Systems PostgreSQL MongoDB Vector databases Firebase Cloud & Deployment Docker AWS Vercel CI/CD pipelines Cloud-native AI application deployment What Clients Get AI agents that automate real business workflows Scalable AI SaaS architectures Fast MVP development for AI startups Secure, production-ready AI systems I focus on building practical AI solutions that solve real problems — not just demos. If you're looking to build AI agents, LLM applications, or AI-powered SaaS products, feel free to reach out.

Why am I a freelancer? In 2003 I single-handedly built a successful multiplayer gaming business from the ground up that is still operating today. I ended up in the freelance world by accident in 2011 when I helped a friend stream-line their eCommerce business. I greatly enjoyed the challenges of building something to fit the exact business needs and my favorite part was seeing the successful results. Since then I have worked with clients ranging from Fortune 500 companies to small start-ups with an idea and lead development on projects ranging from complex reservation systems, insurance billing platforms, mobile apps, custom CRMs and much more. I hope to pass this same experience on to you. Whether you run a small business, a large enterprise, or even a start-up with a great idea -- let's talk!

Top-Rated (Top 3% on Upwork) | 10+ Years Experience | 40+ hrs/week | 100% Job Success I am a Senior Full-Stack MERN / MEAN Developer with 10+ years of professional experience helping startups, scale-ups, and enterprises build high-performance, secure, and scalable web and mobile applications. My core expertise lies in MongoDB, Express.js, React.js, Node.js, modern cloud infrastructure, and AI/ChatGPT integration for intelligent, data-driven products. I focus on clean architecture, scalability, performance optimization, and business-ready solutions, whether you’re launching an MVP or scaling to thousands of users. Full-Stack MERN & MEAN Development (Web & SaaS) • Custom MERN stack and MEAN stack development for web and SaaS applications • Scalable, secure, and SEO-friendly frontend development using React.js, Next.js, Angular, Vue.js • Backend development with Node.js, Express.js, NestJS • SaaS platforms with role-based access, subscriptions, dashboards, analytics, and automation • Performance optimization, bug fixing, refactoring, and long-term maintenance AI & ChatGPT Integration (Smart Applications) • AI-powered web applications using OpenAI, ChatGPT, LangChain • Custom AI workflows for automation, content generation, search, and data analysis • Integration of AI features into SaaS, dashboards, ERPs, and customer-facing apps • Practical AI implementation focused on real business outcomes, not hype API, Microservices & Enterprise Architecture • RESTful and GraphQL API development • Microservices-based architecture for scalable and cloud-ready systems • Enterprise application development including ERPs, CRMs, admin panels, and analytics dashboards • Secure authentication systems using JWT, OAuth, role-based permissions Cloud, DevOps & Scalable Infrastructure • Cloud deployment and optimization on AWS, Google Cloud (GCP) • Containerization and orchestration using Docker and Kubernetes • CI/CD pipelines for automated testing and deployment • Systems designed to scale to tens of thousands of users Blockchain Integration (When Required) • Smart contract development using Solidity • Blockchain integration with Ethereum, Hyperledger, Web3.js • Secure backend integration of blockchain features into MERN applications Why Clients Hire Me • Top-Rated developer (Top 3% on Upwork) • 10+ years of full-stack MERN and enterprise experience • Proven ability to scale platforms to high traffic and large user bases • Clean, maintainable, production-ready code • On-time delivery with proactive communication and updates • Consistent 5-star reviews and 100% Job Success Score Ideal Projects I Work On • MERN / MEAN web applications • AI-powered SaaS platforms • MVPs for startups • Enterprise dashboards, ERPs, and CRMs • High-performance, cloud-ready full-stack systems Core Keywords & Technical Expertise Senior MERN Developer, Full-Stack Developer, MERN Stack, MEAN Stack, React Developer, Node.js Developer, Express.js, NestJS, Next.js, Vue.js, Angular, SaaS Development, Web Application Development, API Development, REST API, GraphQL, Microservices Architecture, MongoDB, PostgreSQL, MySQL, Supabase, Cloud Deployment, AWS, Google Cloud, Docker, Kubernetes, CI/CD, AI Integration, ChatGPT Integration, OpenAI, LangChain, Machine Learning Integration, Blockchain Development, Solidity, Ethereum, Hyperledger, Web3.js, SEO-Friendly Development, Performance Optimization

🏆 Upwork 𝐓𝐨𝐩 R𝐚𝐭𝐞𝐝 Professional 𝐇𝐢𝐠𝐡𝐥𝐲 𝐒𝐤𝐢𝐥𝐥𝐞𝐝 𝐏𝐇𝐏, 𝐋𝐚𝐫𝐚𝐯𝐞𝐥, 𝐖𝐨𝐫𝐝𝐩𝐫𝐞𝐬𝐬, 𝐒𝐡𝐨𝐩𝐢𝐟𝐲, 𝐌𝐚𝐠𝐞𝐧𝐭𝐨, 𝐖𝐢𝐱, 𝐖𝐞𝐛𝐟𝐥𝐨𝐰 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 I am an experienced full stack 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 and 𝐓𝐨𝐩 𝐫𝐚𝐭𝐞𝐝 Upwork Professional in 𝐏𝐇𝐏, 𝐋𝐚𝐫𝐚𝐯𝐞𝐥, 𝐖𝐨𝐫𝐝𝐩𝐫𝐞𝐬𝐬, 𝐒𝐡𝐨𝐩𝐢𝐟𝐲, 𝐌𝐚𝐠𝐞𝐧𝐭𝐨, 𝐖𝐢𝐱, 𝐖𝐞𝐛𝐟𝐥𝐨𝐰 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 with over 𝟏𝟎 years of experience and expertise I can 𝐃𝐞𝐬𝐢𝐠𝐧 𝐚𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩 any kind of Website for any niche. ✔️ Highly skilled coder with a creative approach to customization. ✔️Programmer with a strong drive to produce high-quality work. ✔️ Extensive experience (10+ years) in web development, from task definition to project launch and maintenance. ✔️ PHP, Shopify, Joomla, Magento, Drupal, Opencart, and all other e-commerce platforms. ✔️Proficient in English and an effective team player. ✔️ Ability and wish to find non-standard answers for non-trivial situations - Communication with individuals all round the world. ✔️ Let us know what kind of eCommerce solution you have in mind, and we'll provide you with the most expert team and costs for your projects. To showcase my skill sets, I constantly provide clients with trial jobs. ✔️I have worked in project management, web design and development, lead generation, affiliate marketing, search engine optimization, link building, social media marketing, CSE, and affiliate marketing. Expertise:- 🏅 WordPress Theme Development & Customization & Plugins build and customization Theme like Avanda, Divi, Thrive 🏅 E-commerce ( WooCommerce ) website design and development with customization as need,Dropshipping 🏅 Bug Fixing and malware removing 🏅 Website Speed Optimization & SEO optimization 🏅 Cpanel & Site transfer or migration 🏅 Website management and Maintenance 🏅 Membership (Ultimate Membership Pro, Ultimate Affiliate Pro, s2Member, Wishlist) 🏅 Builders like WPBakery Page Builder,Elementor and Elementor Pro,Divi Page Builder,Thrive Architect,Beaver Builder. 🏅 Other CMS C,Wix, Shopify, Joomla, Magento,Squarespace,Webflow - plugins and theme development/ Customization ,Psd to html/wordpress,Landing page 🏅 APIs (Facebook/ Twitter/ Google/ Stripe/ Pa-yPal/ Mailchimp etc.) Send me a brief direct message, Job invite or you can book a consultation on ZOOM regarding detailing your business needs, and we'll discuss and proceed accordingly. I always believe to delivery top notch and satisfactory result to my client and maintain long-term relationships with them. I always offer recommendations that will benefit for there business. I am always there in connection through out our entire journey, Thank you

- Diligent, alert, detail-oriented, great communicator: you will go BEYOND your goals - Woocommerce, Shopify, API coding, Mailchimp, Sendgrid, Hubspot, Zoho, Klaviyo, SEO - All-aspect Best Practices Ecommerce and Cold/Mass Email - 20+ Yrs Experience - US Based + Prestige Clients: LA Times, Universal Studios (UMG) - 1,200+ LinkedIn Skill Endorsements (challenge me on this!) Excellent job communication skills and habits, stellar writer. Determined and tireless seeking perfect results. Experienced enough to understand and fully deploy your goals. I know the questions to ask to uncover the hidden requirements of your project and deliver on those too. Your goals are made far more reachable as a result of my formidable tech skills (php, python, HTML, CSS, javascript) + my diligence, honesty, attention to detail, and my refusal to allow obstacles to your total success. Codex-compliant WP plugin coding. Mass email improved thru AI and exact metrics. All aspects of advanced e-commerce from AI-generated (but human-reviewed) code applied to email, to click funnels to landing pages, to followup drip campaigns and transactional emails. Don't allow a single tech detail to be overlooked, because that's money to you. FORTY-FIVE 5-Star Ratings By Upwork Clients: If you would do me a kindness at this point, scroll down to Work History and hit the up/down arrow icon to change the sort to 'Highest Rated' - you will see 45x 5-Star reviews of my work of the 100 or so jobs I've done here at Upwork. Formally trained as a 'Cyber Secure Coder' (CSC 110). I am death on security problems and understand PCI-compliance payment processing requirements, making difficulties in advanced payment processing simply disappear. I am commonly the guy they come to after hiring a less-experienced designer or studio whose work resulted in off-scope details of the project that broke as a result of 'unintended side effects'. If you need robust results that will persist (and not break later) then I am your guy. I do not allow any obstacles to total project success. I make communications with you a priority; phone, text, email. Experienced, so I'm fast without being reckless or shooting from the hip. I tend to report via a short email (or Slack, or Discord, Teams, Trello, etc) daily or nearly daily. Full stack developer from AI to Website to email, and brilliant copy writer who can deliver consumer *action*. I pay amazing attention to detail and am deeply committed to best practices... and results. As a writer, I minored in Journalism and I've crafted email templates and mass emails that get up to 68% open rate and 26% click rate (in the toughest of venues: political donations!). Prestige clients: Los Angeles Times, Universal Studios, Wedbush Securities, California Power Exchange, Crypto-Currency Blockchain SEC IPO plus nearly 100 political campaigns where everything has to be 100% right the first time (and be delivered fast). Email/SMS: scripting + API experience in Twilio, Klaviyo, Hubspot, Mailchimp, Sendgrid, SocketLabs, Zoho Twilio, NationBuilder and more. I am a determined and tireless campaigner who uses ALL digital channels in an *integrated* fashion.

Over the last 6 years, I have developed a wide range of websites using Codeigniter, Laraval, REST API, Advance PHP, Wordpress, Joomla, Drupal, Jquery, Ajax and MySQL/ MSSQL, Bootstrap including sites for several Companies and small businesses. Please look my details and experience in the following areas: - Full time freelancer and completed 1300+ hours as Top Rated programmer - 6+ years of extensive experience in advanced PHP programming - 5+ years of experience with CodeIgniter - APIs integrated from Google, Yahoo, Facebook, Twitter, PayPal, Stripe, MailChimp, RETS, EodData, Amazon, eBay, WizIQ, Nestoria etc - Payments with PayPal, Stripe, PayU etc - 4+ years of experience with Wordpress (Blog, CMS, Plugin and Theme Customization) - Strong understanding of OOP and OOD - Deep familiarity with LAMP and WAMP Environement - Developed more than 60 Codeigniter websites , 40+ Wordpress websites and more than 100 custom and advance PHP projects. - Strong understanding and experience with JavaScript and jQuery and Javascript framework like Angular.js, node.js - Have good experience with AJAX - Have good skills in HTML and CSS (table-less design) - Have good experience in designing interactive and responsive UX/UIs - Have basic skills in Onpage and Offpage optimization for SEO. - Have good skills in Project Management - Have good experience in customizing, upgrading existing web applications - Have expertise in designing and implementing custom CMS on specific client requirements My goal is to keep my clients on the leading edge of information transfer technologies and adding significant value to their business. Thank you for visiting.