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Design-minded frontend and mobile engineer with 7+ years of experience building polished, reliable applications for web and mobile. I’m strongest at the intersection of product, design, and engineering: turning rough ideas, messy MVPs, and complex requirements into clean, intuitive, production-ready interfaces. My deepest experience is with React, Next.js, TypeScript, Tailwind, and React Native. I’m also comfortable adapting across modern stacks and using AI-assisted workflows to move faster while keeping the final product stable, maintainable, and visually polished. I can help with: - SaaS products and dashboards - web and mobile apps - AI-powered product features - React / Next.js / React Native development - TypeScript frontend architecture - Tailwind / shadcn/ui interfaces - MVP cleanup and productionization - UX polish and product improvements - clean, stable, maintainable code I’m a good fit when you need someone who cares about taste, details, usability, and code quality — not just someone to implement tickets.

If you need an affordable full-stack developer who can do the highest quality work in the Symfony framework, I am your first bet. With more than 5 years of experience in PHP and Symfony, I am ready to do all kinds of backend work, which includes database management, creating REST API for front-end or mobile app, writing unit tests with PHPUnit, and handling basic dev-ops stuff (experience with AWS). I have a great knowledge of React on the frontend as well, which I use to create complex web interfaces.

Hi there! I’m Zeljana, a Senior Shopify & Full-stack Developer (React, Next.js, Vue, Angular) who helps businesses turn ideas into engaging, high-converting digital experiences. With a strong background in Shopify and frontend & backend development, I don’t just implement designs -- I actively contribute to product direction, challenge assumptions, and suggest improvements that enhance usability, performance, and conversion. I bridge the gap between design, development, and business goals to build websites that look great and perform even better. My expertise includes: ✅ UX/UI Design – Creating intuitive, visually appealing interfaces that enhance user engagement and drive conversions. ✅ Shopify Development – Custom theme customization, store setup, app integration, app customization, and performance optimization. ✅ Frontend Development – Building responsive, pixel-perfect websites using HTML5, CSS3, JavaScript, Tailwind CSS, React, Next.js, Vue.js, and Angular (v15–v18). ✅ Backend Development – Building scalable server-side logic and APIs using Node.js, Express, Python (Django / Flask), PHP (Laravel), and databases like PostgreSQL, MySQL, MongoDB, and Firebase. Experience with authentication (JWT, OAuth), RESTful APIs, GraphQL, and cloud services (AWS, Vercel, Netlify). ✅ Shopify CRO Optimization – Improving store conversion rates through UX improvements, performance tuning, and data-driven enhancements. ✅ Shopify App development, App Integration & Customization – Seamless third-party app development & integration and custom app modifications tailored to business needs. ✅ Conversion Optimization – Focusing on user experience, speed, accessibility, and clean code to maximize online success. I enjoy working as a true partner, not just a task-taker. I take initiative, communicate openly, and focus on delivering practical, well-thought-out solutions that support business growth. Whether you need a custom Shopify store, a high-converting landing page, or a fully interactive frontend & backend application, I help shape the solution — not just build it. Let’s connect and build something great together! 🚀 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: Shopify Developer, Shopify Expert, Shopify Plus Developer, Shopify Designer, Shopify Store Design, Shopify Store Setup, Shopify Store Development, Shopify Store Redesign, Shopify Website Developer, Shopify Website Design, Shopify Website Redesign, Shopify Theme Customization, Shopify Theme Developer, Custom Shopify Theme, Shopify Ecommerce Website, Shopify Ecommerce Store, Shopify Ecommerce Developer, Shopify Online Store, Shopify CRO, Shopify Conversion Rate Optimization, Shopify Speed Optimization, Shopify Performance Optimization, Page Speed Optimization, Core Web Vitals, Shopify Liquid Developer, Shopify App Development, Shopify App Integration, Custom Shopify App, Shopify Checkout Customization, Shopify Plus Architecture, Shopify B2B, Shopify Wholesale, Shopify Migration, WooCommerce to Shopify, Magento to Shopify, Shopify SEO, Shopify Mobile Optimization, Shopify Landing Page, Shopify PDP Optimization, Figma to Shopify, Shopify 2.0, Shopify Metafields, Shopify Functions, Shopify Scripts, Shopify Flow, Shopify API Integration, Shopify GraphQL, Shopify Headless Commerce, Shopify Hydrogen, Ecommerce Website Development, Klaviyo Integration, Recharge Integration, Yotpo Integration, DTC Brands, Supplement Ecommerce, Skincare Ecommerce, Beauty Ecommerce, High-AOV Shopify Stores, Shopify Store Management, Shopify Maintenance, Shopify Support, Shopify Consulting, Shopify Specialist, Shopify

I specialize in developing full-stack applications across SaaS platforms, Learning Management Systems (LMS), EduTech, marketplace ecosystems, and e-commerce solutions. Top Rated Full-Stack Developer with 8+ years of experience designing, developing, and maintaining scalable web applications, AI-enhanced platforms, and eCommerce solutions. Skilled in modern frontend frameworks including React.js, Next.js, and AngularJS, with strong backend experience in Python, Django, FlaskAPI, Node.js, Nest.js, and Go. Experienced in WordPress and Shopify development, including custom themes, CMS customization, eCommerce workflows, and third-party integrations. Strong expertise in OpenAI integration, REST API development, payment gateway implementation, PostgreSQL database management, and responsive frontend development. Adept at building reliable CI/CD pipelines with GitHub Actions and deploying scalable applications using AWS, GCP, and Azure. Focused on clean code, performance, security, maintainability, and delivering practical solutions that support real business goals. Key Skills: AI Integration: Expert in integrating AI into real-world web applications, SaaS platforms, automation workflows, and internal business tools. Experienced with OpenAI, GPT-4o, Claude models, Whisper, embeddings, vector search, chatbots, AI assistants, document processing, content generation, and voice-based AI features. Skilled in building intelligent user experiences using NLP, prompt engineering, API orchestration, and custom AI workflows. WordPress, Shopify & CMS Development: Strong experience building, customizing, and optimizing WordPress, Shopify, and CMS-based websites. Skilled in custom theme development, plugin customization, Shopify Liquid, landing pages, product pages, checkout improvements, performance optimization, responsive layouts, and third-party app integrations. Able to support both simple business websites and complex eCommerce platforms. Frontend Development: Proficient in building modern, responsive, and high-performing user interfaces using React, Next.js, JavaScript, TypeScript, HTML, CSS, Tailwind CSS, and modern UI frameworks. Experienced in creating clean layouts, reusable components, mobile-friendly pages, admin dashboards, customer portals, and conversion-focused landing pages. Backend Development: Skilled in developing secure and scalable backend systems using Node.js, Python, REST APIs, and PostgreSQL. Experienced in API design, database architecture, authentication, role-based access, third-party integrations, background jobs, data processing, and backend logic for SaaS and eCommerce applications. Payment Gateways & eCommerce: Experienced in implementing secure payment systems and eCommerce workflows, including Stripe, PayPal, Shopify Payments, subscriptions, checkout flows, order management, invoices, and transaction handling. Focused on security, reliability, and smooth customer purchase experiences. Automation & Workflow Integration: Experienced in automating business processes using AI tools, APIs, webhooks, CRM integrations, email automation, data sync, and custom workflow systems. Able to connect multiple platforms and reduce manual work through smart automation. DevOps & Cloud: Adept at setting up CI/CD pipelines with GitHub Actions and deploying scalable applications using AWS, Azure, Vercel, and cloud-based infrastructure. Experienced with environment setup, production deployment, monitoring, performance optimization, and maintaining reliable delivery workflows. Development Approach: Focused on building clean, scalable, and maintainable solutions that solve real business problems. Comfortable working across frontend, backend, AI integrations, CMS platforms, and cloud deployment while keeping communication clear and delivery consistent. Let's connect!

⭐⭐⭐⭐⭐ "Bruno has been an amazing contribution to our front-end team. He’s efficient, responsive, and helpful. He has made a new React.js screen to our site with a lot of complex animations and many of those little but important details for UX. He killed it basically, and we will definitely work with him again. Highly recommended freelancer!" I am a communicative person, who has a keen interest in developing scalable, maintainable software with high-quality code, on-time delivery, and adherence to specifications. Why am I good at it? As a passionate learner, I am always seeking new opportunities, and I care about the satisfaction of my customers. I worked on projects of famous companies or projects that famous companies used: ✅ Philip Morris IQOS Greece ✅ Music Supervisor / WeGetArtist (Used by Netflix) ✅ Optilogic Cosmic Frog ⭐ Valuable contributions I can make to your project ⭐ ✅ 4 years of experience in React.js development. ✅ In-depth understanding of React's core concepts. ✅ Proficient in diagnosing and resolving performance issues promptly. ✅ Amazing CSS skills that can make impossible animations possible. ✅ Expertise in refactoring class components into functional components using React hooks. ✅ Exceptional communication skills, providing 24/7 availability to keep you informed about project status. ✅ Dedicated to ensuring your success and delivering tangible value to your business. ⭐ Here are compelling reasons why choosing me sets me apart from other freelancers:⭐ ✅ Focus on providing value to all of my clients and earning their trust through exceptional service. ✅ Core commitment to over-delivering, going beyond expectations to leave clients amazed. ✅ Maintain a high level of responsiveness, keeping communication channels open for seamless collaboration. ✅ Demonstrate resilience in tackling any challenges faced by clients and finding effective solutions. ✅ Embrace kindness as a guiding principle, treating everyone with respect, empathy, and a genuine desire to improve their situations. ⭐Technologies ⭐ - HTML5, CSS3, SASS - Bootstrap, MUI, Tailwind, KendoUI - JavaScript, jQuery - React.js Next.js - Redux, Redux Saga, Redux Toolkit - Vue, Vuex, Nuxt - Typography - WebFonts, Font-Face - Responsive Design - Cross-browser Optimization - Yarn, NPM - Git, GitLab, GitHub, Bitbucket - Trello, Jira, Slack - Mac OS, Linux, and Windows user. Would you be interested in leveraging my skills in order to develop any application and grow your business at the same time? If you would like to discuss the job posting in more detail with me, you can invite me to your job posting.

I am a Software Developer with a Bachelor's degree in Business Informatics from the Faculty of Organization and Informatics, University of Zagreb. My primary focus is backend and application development for web, mobile, and software platforms. I have experience building applications using technologies such as Node.js, TypeScript, C#, .NET, Kotlin, SQL databases, and REST APIs. I develop web applications, backend systems, mobile applications, and software tools while focusing on clean architecture, maintainable code, and reliable application logic. My development background allows me to understand both the technical implementation and the user experience side of software products. In addition to development, I also provide manual QA testing and usability validation for web and mobile applications. Because of my technical background, I approach testing from a developer’s perspective and can identify not only visible UI bugs but also potential logic issues, backend problems, or API-related errors. My QA work includes: • Mobile app testing (Android / iOS) • Web application testing • AI conversational system testing • Functional and usability testing • Writing detailed bug reports with reproduction steps • Verifying bug fixes and validating application flows I regularly collaborate with development teams and create structured issues using tools such as GitHub Issues, Jira, Trello, Notion, and Slack. I am familiar with modern development workflows including GitFlow methodology, which allows me to communicate issues clearly and efficiently with engineers. Technical stack: • Node.js / Express • C# / .NET • Kotlin (Android development) • SQL databases • NoSQL databases (MongoDB) – schema design, querying and integration with backend APIs • REST APIs • Git / GitHub Alongside development and QA work, I am also open to smaller or quick tasks such as bug verification, app testing, usability testing, and technical support tasks. I am reliable, detail-oriented, and focused on delivering accurate and high-quality results. If you need a developer who understands both software development and quality assurance, I would be happy to help.