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Need a full-stack product built fast without sacrificing scalability? With 15 years as a Full-Stack Developer and AI Engineer, I’ve delivered 16k+ hours and $1M+ earnings across web and mobile products. For startups and SaaS teams, I build React, Next.js, Node.js, and Flutter solutions that launch cleanly and scale confidently. 🎯 HOW I CAN HELP YOU FULL-STACK WEB APPLICATION DEVELOPMENT Launch scalable web products that convert users faster and support long-term growth. I build React, Next.js, Node.js, and TypeScript applications with architecture choices that have supported $1M+ in Upwork earnings and 100% Job Success. AI AGENT AND OPENAI INTEGRATION Add intelligent features that automate work, reduce manual effort, and create new product value. I integrate OpenAI APIs and AI workflows into existing platforms to accelerate delivery and turn ideas into usable AI-powered products. MOBILE APP DEVELOPMENT Ship iOS and Android apps that give users a smooth experience across devices and help you reach more customers. I develop with Flutter, React Native, Swift, and Kotlin, with proven experience delivering apps published to both Apple and Google app stores. SAAS PLATFORM DEVELOPMENT Turn complex ideas into secure, scalable SaaS products that are ready to monetize. I have built multi-tenant platforms with authentication, billing, APIs, and dashboards for startups and enterprise teams in as little as MVP timelines. API AND BACKEND ENGINEERING Increase system stability, speed up integrations, and support growth with robust backend foundations. I design Node.js, NestJS, Express, PostgreSQL, and cloud-based systems that handle real-world product demands across web, mobile, and AI features. 🏆 RESULTS "Thanks to Cinnamon's efforts, the app's server response times were excellent, and the end client was thrilled with the results. The team was responsive and pragmatic in responding to needs, communicating via virtual meetings, emails, and messages. Their talented engineering team was impressive." – Gregory W., Founder, Mojave Interactive LLC "Thanks to Cinnamon's work, the client has seen a 25% higher completion rate and 40% less completion time. The pricing calculators have reduced the error rates by 50%. The team delivers timely items, responds quickly to messages, and addresses requests effectively. Their support is unique." – Premnath M., Head of Software Development Digital Bank, BAWAG AG "The Android app has thousands of downloads and impressive online ratings, which reflects Cinnamon Agency's technical expertise. The team is willing to work long hours to meet deadlines. They excel at project management and have a robust reporting system in place." – Garin Toren., Founder, Ping 🎖 JavaScript Algorithms and Data Structures Certification 🎖 React Developer Certification 🎖 AI Engineering and LLM Integration Certification See full case studies in my portfolio below. 🤝 𝗚𝗘𝗧 𝗜𝗡 𝗧𝗢𝗨𝗖𝗛 Have an app idea or product to launch? Message me on Upwork today for a free consultation and a clear plan to move forward. I typically respond within 4 hours and can offer quick turnaround for urgent projects. 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 I build in React, Next.js, and TypeScript to ship fast, maintainable web apps, then use Node.js, PostgreSQL, and AWS to keep the backend reliable and scalable. For AI features, I integrate OpenAI APIs and Cursor into workflows that automate tasks and add real product value. I also use Flutter when a project needs a polished cross-platform mobile app. I build full-stack web applications with React and Next.js, integrate Node.js APIs, and deliver mobile app development with Flutter and AI development that scales.

As a seasoned full-stack web developer, my passion lies in crafting exceptional user experiences through innovative web design and development. With a rich and diverse background, I have honed my skills over the years, making me a valuable asset for individuals and businesses seeking to bring their web projects to life. 🌟My Expertise🌟 ✅Driving Tangible Project Success: My ultimate objective is to contribute to the resounding success of your project. Whether your goals involve increasing sales, enhancing user engagement, or elevating your online presence, my commitment is unwavering—I am determined to deliver results that bring about quantifiable impact. ✅Collaborative Approach: I recognize that effective communication and collaboration are the pillars of project success. When you engage me, you're not simply hiring a developer; you're partnering with a professional who actively listens, asks insightful questions, and aligns every action with your strategic objectives. ✅Masterful User-Centric Design: My design philosophy goes beyond aesthetics; it revolves around a deep understanding of your users. I immerse myself in user behavior and preferences, allowing me to create interfaces that not only captivate but also seamlessly guide users towards engagement and conversion. My designs are meticulously tailored to your specific target audience, ensuring a cohesive and delightful user journey. ✅Technical Versatility: My technical repertoire spans a wide spectrum of technologies, including HTML, CSS, JavaScript, React.js, NEXT.js, Redux, and more. I stay abreast of industry trends, guaranteeing that I leverage the most cutting-edge tools and methodologies to meet the unique demands of your project. ✅Efficiency and Scalability Optimization: Beyond coding, I am a strategist who excels at building systems for peak efficiency and future scalability. Whether it's fine-tuning loading times for an enhanced user experience or architecting databases to accommodate exponential growth, I am dedicated to ensuring that your web applications perform flawlessly as your user base expands. ✅Innovative Problem-Solving: I thrive on challenges and see them as opportunities to innovate. My knack for creative problem-solving allows me to discover unique and tailored solutions for your distinct needs. Whether it's overcoming a technical hurdle or resolving a design conundrum, I relish the chance to think outside the box and provide inventive answers. 👨‍💻 My Skills Include 👨‍💻 Front End Development 💻 HTML / HTML5, CSS / CSS3, SCSS, JavaScript, TypeScript, React, Redux, NEXT.js Back End Development 💻 Node.js, Express.js, MongoDB, Firebase, GraphQL Other Skills 🎨 UI / UX Design, Responsive Design, Figma, AdobeXD Your web development and design projects are primed for excellence with me as your ally. Together, we can amplify your online presence, achieve measurable success, and establish a profound digital footprint. 📩 Let's embark on this journey together - don't hesitate and send a direct message or invite to the project for an experience to sculpt web solutions that not only meet but surpass your highest expectations.

As a software engineer with 6+ years of experience, I feel at home with TypeScript, Rust, Python, and Go. However, where I really shine is when the task requires jumping into the unknown and adapting quickly: whether it's diving deep into WebAssembly code and fixing an upstream dependency at C FFI level, picking up WebRTC to work on video capture software, or figuring out integrations into established systems I've never worked with, I adapt and deliver. Selected achievements: - Led a full data-layer migration (CouchDB/PouchDB → SQLite/cr-sqlite) when the original store could not handle production-scale sync, keeping a deployed product shipping through the change. - Cut cold page-load latency ~10x (from 1.5–3s down to 200–500ms) on an in-browser SQLite app by benchmarking every route, adding indexes, and restructuring load functions to stream data instead of blocking on it — turning a sluggish tool into a near-instant one. - Designed the initial relational menu model and item-pool publishing logic for a restaurant-menu platform, cutting menu authoring for multi-location operators from days to hours while keeping published menus fast to read. - Replaced a client's multi-day, spreadsheet-driven month-end reporting with a validated import + review/publish portal on SvelteKit + Supabase/Postgres — the new workflow is estimated to bring reporting for 30–50 properties down to roughly a single workday plus exceptions. - Designed an organisation-scoped access model with Postgres Row-Level Security and JWT claim enrichment so admins manage every report while client users only ever see their own published data — closing off cross-client data leakage at the database boundary, not just in app code. What clients hire me for: - End-to-end SaaS product delivery in TypeScript (SvelteKit / Node / Express + Postgres / Supabase) - Data modeling, schema design, and safe migrations on Postgres - Authentication, access control, and Row-Level Security (org-scoped / multi-tenant isolation) - Backend and REST API design plus third-party API and data-ingestion pipelines - Performance optimization and production reliability (health checks, fail-closed migrations, indexing) - Test automation across database (pgTAP), unit (Vitest), and end-to-end (Playwright) layers I work by understanding the real problem first, shipping the thinnest valuable slice so it creates value early, then iterating — most of my projects went live in staged increments rather than a big-bang launch. For technically deep buyers: my background also runs into local-first / offline-sync and WASM/C-FFI systems work, which is where the harder data-layer and performance problems get solved.

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 👋 I'm Marijan. I'm a full stack software engineer who builds production systems that work and don't break at 3am. I use AI tools daily to ship faster, but everything I deliver is grounded in real engineering - clean architecture, secure code, and infrastructure that scales. 7+ years building across e-commerce, SaaS, real-time platforms, and internal business tools. I've migrated stores to headless Shopify Plus, rewritten crashing platforms from Node.js to Go, designed authentication systems from scratch, and built APIs that replaced entire manual workflows. GCP Certified Cloud Engineer. What I Bring to the Table 🛒 E-Commerce Engineering - headless stores, Shopify Plus, BigCommerce, WooCommerce, custom integrations 🤖 AI-Powered Systems - agents, automations, LLM integrations built on real cloud infrastructure, not duct tape 🔧 Full Stack Development - React, Next.js, Go, Node.js, Python, PHP, from frontend to deployment ☁️ Cloud and DevOps - GCP certified, Docker, CI/CD pipelines, infrastructure that actually deploys reliably 🔐 Secure by Default - OAuth, API security, data protection baked in from day one 🚀 MVPs & Prototypes – from idea → working product quickly 🛠 Fixing and Scaling Existing Apps - performance optimization, codebase rewrites, database tuning, tech debt cleanup Why Work With Me ✅ fixed servers that crashed under normal load by optimizing database queries. ✅ replaced 15 manual scripts with one unified API. ✅ led full platform rewrites and headless migrations without downtime. ✅ I don't just ship features - I solve the engineering problems behind them. Tech I work with daily: React, Next.js, TypeScript, Node.js, Go, PHP, Python, PostgreSQL, MongoDB, Redis, Shopify APIs, WordPress, GCP, Docker Have a project in mind? Send me a message with the details. I'll get back to you with an honest assessment of how I can help - or tell you if someone else is a better fit.