I am a Senior Full Stack Engineer with 12+ years of experience in developing scalable web applications, CMS solutions, workflow automation, and cloud infrastructure. My expertise spans across frontend and backend development, cloud-native architectures, DevOps, and process automation, ensuring high-performance applications and efficient deployment strategies. -Skills: ✔ Full Stack Development – Expertise in Typescript, React, Next.js, Angular, Vue.js for the frontend and Node.js, Nestjs, PHP (Laravel), Python(Flask, Django), .NET for the backend. ✔ State Management - Redux, Zustant, Vuex, RxJS ✔ CMS Development – Custom and scalable solutions for WordPress, Strapi, Shopify, and Headless CMS. ✔ Automation & Workflow Optimization – Proficient in Zapier, n8n, Make, and Zoho Flow to streamline business operations. ✔ DevOps & Cloud Engineering – Hands-on experience with Docker, Kubernetes, AWS, Azure, and CI/CD pipelines for smooth deployment. ✔ API Development & Integration – RESTful and GraphQL API development for seamless system communication. ✔ Performance Optimization & Security – Ensuring applications are fast, scalable, and secure. - Why Hire Me? ✅ Proven track record of successful project delivery across multiple industries. ✅ Strong problem-solving skills and ability to optimize complex workflows. ✅ Committed to delivering clean, maintainable, and high-quality code. ✅ Excellent communication and on-time project completion. Let’s collaborate to bring your ideas to life!

Experienced software engineer passionate about building clean, efficient, and high-quality applications. I leverage AI tools daily to dramatically boost my productivity, allowing me to deliver features faster, write cleaner code, catch edge cases early, generate robust tests, and iterate rapidly without sacrificing quality. I have extensive experience creating data-driven full-stack applications with React, Node.js, and modern ecosystems, and I've successfully delivered large-scale projects for well-known clients as a freelancer. I'm also strong in application architecture, testing strategies, component libraries / design systems, performance optimization and security best practices. What I can do for you: - Build or enhance frontend UI/UX (React, Next.js, TypeScript, Tailwind, etc.) and backend APIs + databases (Node.js, Express/NestJS, PostgreSQL/MongoDB, etc.) - Develop new features for your existing full-stack web or hybrid applications - Solve complex software-related business challenges with practical, scalable solutions Improve code quality by significantly expanding test coverage (unit, integration, E2E) - Fix bugs, refactor, or fully migrate/rewrite legacy codebases to modern technologies

Senior software engineer and frontend architect with over 5 year of industry experience across different platforms, systems and services. Over last 7 years I'm completely focused on JavaScript stack as well as cloud platforms. I mostly worked on web platform along with desktop and mobile application as well as a DevOps. I love designing infrastructures and I've experience working as a Web FrontEnd Architect and of course as a FullStack developer. Maintain all the industry standards during development to deployment - such as test driven development, bundling, using supersets, proper use of git flow, continuous integration and all other stuffs. As I mostly experienced on frontend stuffs - I personally prefer all major frameworks and libraries and pick them up on purpose. Such as : React + Redux, Angular 2/4/5, Vue 2 I prefer ReactNative for X-platform and /Cordova/Ionic for hybrid mobile app development and again depend on purpose . I also develop high performance and massive IO oriented server side app on Nodejs runtime environment and preferred frameworks are Express, koa and hapi and database mostly NoSQL - MongoDB is my first choice. I have been working as an AWS Solution Architect Associate more than 2 years.

I am a senior full-stack developer with over 10 years of experience in crafting scalable web and mobile applications. Proficient in Go, Python, TypeScript, and Flutter, I specialize in building high-performance solutions that meet diverse business needs. My expertise extends to backend architecture and cloud infrastructure, primarily on AWS, ensuring robust and reliable applications. As a product owner, I thrive in environments where I can lead projects from conception to deployment, integrating user feedback to enhance functionality. I have a strong track record of developing innovative, cross-platform UI solutions that engage users effectively. If you're looking for a developer who can combine technical skill with a strategic approach to product development, let's discuss how I can contribute to your project.

I am a veteran software architect and full-stack engineer with over 18 years of experience designing, building, and shipping production-grade enterprise systems. Whether you need a strategic technical transformation, cloud infrastructure modernization, or robust AI integration, I deliver end-to-end execution. My approach is entirely hands-on: I don't just design architectures; I pair them with working, production-ready code. 💡 Core Expertise: Strategic Consulting: Software architecture, legacy system refactoring, and technical hiring strategy. Full-Stack Development: Expert-level React, Next.js, Node.js, Python, and TypeScript. Cloud & DevOps: Secure, scalable infrastructure via AWS, Azure, and Cloudflare (EU/GDPR compliant). GenAI & Data Pipelines: Production-grade GenAI integrations and optimized RAG pipelines. From slashing technical debt to saving companies over €200K annually through strategic data migrations, I align deep engineering with real business value. Let’s build something built to scale.

CTO and Engineer. I'm fast, iterative and responsible. Endoros - React | Next.js | Supa - Built the media kits platform for creators from scratch - Integrated Facebook API, Tiktok API, YouTube API, OAuth. - Acquired over 300 influencers spanning > 10 mil followers. - Built infra to enrich db with 150k+ creator emails for 0.1% cost compared to competitors ServeAI - React | Next.js | Supa | OpenAI - Built AI-powered menus for restaurants - Served 20+ restaurants in NL. - Enriched DB with 100k+ restaurant contacts. - Built e-mail outreach and leads acquisition pipeline

I build modern web applications, SaaS platforms, and internal tools that are scalable, maintainable, and ready for production. Many projects fail not because of lack of features, but because of poor architecture and execution. I focus on building solid full-stack systems that are reliable, easy to extend, and aligned with real business needs. --- What I Build Web Applications and SaaS Platforms • Full-stack SaaS products using Next.js, React, and Node.js • Scalable backend systems and API architectures • Multi-tenant applications and data-driven platforms Dashboards and Internal Tools • Admin dashboards and operational tools • Data-heavy interfaces with clear UX • Systems that improve internal workflows and team productivity API Integration and System Architecture • Third-party API integrations (payments, CRMs, analytics) • Backend architecture for scalability and performance • Cloud-ready applications using Vercel and AWS --- How I Work • Focus on clean architecture and long-term maintainability • Build production-ready systems, not quick prototypes • Communicate clearly and iterate quickly • Align technical decisions with business goals --- Tech Stack Next.js, React, Node.js, TypeScript Vercel, AWS, REST APIs, databases --- If you need a reliable full-stack developer to build or improve your product, I can help deliver a scalable and maintainable solution.

Your WordPress site should win you customers, not load slowly, break on mobile, or look like every other template. I build fast, high-converting WordPress and WooCommerce sites for businesses across the EU and US, and I can go full-stack (React, Laravel, headless) when a project needs more than a page builder. I'm Jari, an EU-based developer in the Netherlands with an engineering degree and 5+ years building and fixing WordPress, WooCommerce, custom themes and plugins, Laravel apps and Magento stores. ✅ 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗼 • Custom WordPress and WooCommerce sites that are fast, clean and easy to manage • Speed and Core Web Vitals optimization (real fixes, not just a caching plugin) • Conversion-focused builds and redesigns that drive leads and sales • Headless WordPress (WP + React/Next.js) and custom PHP/Laravel when you need it • Bug fixes, rescue jobs, migrations and ongoing maintenance/care plans ✅ 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗵𝗶𝗿𝗲 𝗺𝗲 • I find the real problem first. I don't bolt on 15 plugins to fix what one clean solution handles. • EU-based, so you get full timezone overlap with European clients, afternoon overlap with the US, and your data stays under EU/GDPR jurisdiction by default. • Native Dutch, fluent English, conversational French and German, so communication is clear and fast with no language friction. • Engineering background, verified ID and military-veteran reliability. I scope clearly, deliver on time, and stick around for support. ✅ 𝗥𝗲𝗰𝗲𝗻𝘁 𝗽𝗿𝗼𝗼𝗳 "Jari worked fast and reliably to fix a critical issue I had with my WordPress contact form. He knew exactly where to look and checked everything. Within less than 24 hours the form worked like a charm. Would definitely work with him again!" (Ronnie L.) "Excellent service from Jari at Rengelmedia. He updated the portfolio on my website exactly according to my wishes. Communication was clear, he made sure we were on the same page, and he was transparent about the time needed and the final price. Very happy with the quality of the work. Highly recommended!" (Ricardo V.) "Outstanding experience every single time. Consistently above and beyond my expectations, delivering high-quality work with great attention to detail. Communication is smooth, deadlines are always met (often even earlier), and the results truly speak for themselves. I highly recommend to anyone looking for reliable and top-tier service!" (Patrice E.) ✅ 𝗧𝗲𝗰𝗵 𝗜 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 WordPress, WooCommerce, Elementor, custom themes and plugins, PHP, Laravel, React, Next.js, Vue, Node.js, Tailwind, MySQL/PostgreSQL, Git, Docker. Core Web Vitals, page-speed and on-page SEO baked in. If you need a WordPress site that's fast, reliable and actually converts, or a developer to rescue one that isn't, send me a message with your goals and I'll tell you honestly how I'd approach it.

I'm a full-stack software engineer with almost ten years of experience building web applications end to end, from UI components to backend integrations and data layers. Since 2015 I've worked across a wide range of stacks, including React, SvelteKit, Angular, GraphQL, Node.js, Python, and Scala, with a strong frontend focus and a comfortable footing across the rest of the stack when needed. Much of my work has centred on data-heavy and real-world products: building data visualisation dashboards with React and D3, architecting a federated GraphQL layer using Apollo Federation and Gateway to unify multiple backend services into a single schema, and developing a Progressive Web App for field use in low-connectivity environments. I've also worked with data pipelines processing real-time information from IoT sensors and external data feeds. I enjoy taking ownership of features end to end, from first sketch to shipped code, and I work well in small teams where decisions move fast and feedback from real users comes quickly. I'm a pragmatic problem solver and a fast learner, comfortable picking up new tools and technologies when the problem calls for it.

I build full-stack web applications, ERP systems, dashboards, admin platforms, and automation tools for businesses that need reliable internal software. My main stack includes Next.js, React, TypeScript, Node.js, SQL Server, PostgreSQL, Docker, Nginx, Azure/VPS infrastructure, REST APIs, and AI-assisted workflow automation. I can help with: - ERP and internal business applications - Admin dashboards and data-heavy interfaces - Dynamic forms, layout builders, and configurable workflows - Multi-tenant database infrastructures - SQL-backed applications and database design - API development and third-party integrations - Deployment, server setup, Docker, Nginx, and DevOps workflows - AI-assisted document, quoting, and business-process automation My background also includes industrial automation and engineering systems, which helps me understand complex real-world operations and turn them into practical, maintainable software. If you need someone who can work across frontend, backend, database, infrastructure, and business logic, I can help you design and build the full system.