REVIEWS ⭐ "Stijn transformed my coaching platform in just 3 weeks. Now my clients have an amazing user experience." - Swedish AI coach with 5000+ clients ⭐ "Stijn revamped our outdated coaching site into a modern, user-friendly hub. Highly recommend!" - Private coaching institute with over 3400 students ⭐ "He built us a platform that's a game-changer for our growth." - $100,000 marketing agency RESULTS ⤷ $28M Generated in Sales Through CRO and Performance Optimization ⤷ Top Rated (pre-screened by Upwork talent team for top 1% talent) - 25+ Positive Reviews From My Clients ⤷ Achieved $29K in revenue with a $2K optimization for an Online Coaching Company ⤷ Generated Over $73K From $9K in Landing Page Optimization for an Online Course Platform ⤷ Scaled an Online Fitness Coaching Business From 1.2X to 4X ROAS In Record Time ($3M Generated) ⤷ Quadrupled x4 Revenue for a Coaching Subscription Service to $10,000 - Increased ROAS by 244% For an Art and Crafts Coaching Brand PRESENT - Average ROI Of My Current Clients Stands Around 6.31 Though I would love to work with everyone who reaches out to me, experience has taught me that not every business is a good fit, and I am not a good fit for every business. Sadly, I can only prioritize coaching businesses with a long-term vision and the necessary ingredients for success. 🏆 Your landing page is the key to converting your audience and driving conversions. Create personalized, efficient, and scalable marketing solutions that enhance lead conversion rates and nurture your audience! Looking to optimize your landing page? 1. Get landing pages that align with your business goals. 🔄 2. My strategies focus on advanced direct selling copywriting to maximize engagement. 📊 Need a complete landing page overhaul? 1. Get a full landing page setup in just 3-7 days. 2. Book directly from my project catalog or contact me. 📅 Starting from scratch? 1. In 2-3 weeks, you'll have a tailored landing page strategy that turns leads into loyal clients. ✅ 2. Message me to schedule a free virtual consultation. 🖥️ Not sure where to begin? 1. Book a Marketing Automation Review consultation. 👇 2. Within 72 hours, you'll receive a detailed analysis of your automation setup and recommendations for improvement. 3. The cost of the consultation will be deducted from any future work we do together. 4. Everyone I work with benefits from my proven 🤯 methods and access to my network of trusted service providers. Can I help your coaching business grow? Maybe. I prioritize businesses with a long-term vision and the key ingredients for success. If I believe we're a good fit, we'll achieve great things together. You have endless opportunities ahead. It all starts with an outstanding landing page as a solid base. Message me to choose the landing page Package that works best for you.

Hello! I'm a passionate and dedicated freelance developer with over 20 years of experience in building robust web, enterprise, and mobile applications. My expertise spans across both front-end and back-end technologies, allowing me to deliver full-cycle development solutions tailored to your needs. I pride myself on my ability to communicate effectively and deliver projects on time and within budget. 𝗦𝗸𝗶𝗹𝗹𝘀 • Web Development Frameworks: React, Angular, Vue.js, Node.js • Backend Technologies: Python (Django, Flask), PHP (Laravel), Java Spring • Mobile Development: React Native, Flutter • Database Management: MySQL, MongoDB, PostgreSQL • Cloud Services: AWS, Azure, Google Cloud, Digital Ocean • DevOps: Docker, Kubernetes, CI/CD pipelines, GitHub Actions • CMS Expertise: WordPress, Shopify, Magento, WooCommerce • AI/ML: Machine Learning (scikit-learn, TensorFlow, PyTorch), Deep Learning, Natural Language Processing (NLP), Computer Vision, Large Language Models (LLMs) • SEO: Keyword Research, On-Page Optimization, Off-Page Optimization, Technical SEO, SEO Auditing, SEO Analytics, Search Console, Google Analytics • QA: Test Automation (Selenium, Cypress, Appium), Functional Testing, Regression Testing, Performance Testing, API Testing, Usability Testing, Test Planning, Defect Tracking, Agile Testing Methodologies • Technical Project Management: Agile Methodologies (Scrum, Kanban), Waterfall, Risk Management, Project Planning, Project Scheduling, Budget Management, Stakeholder Management • Business Analysis: User Stories, Use Cases, Business Process Modeling/Redesign, Data Flow Diagrams, Prototyping, Stakeholder Interviews, Workshops, Requirements Documentation 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗢𝗳𝗳𝗲𝗿𝗲𝗱 • Custom Web Application Development • E-commerce Solutions • AI-Powered Solutions • API Development and Integration • Website Redesign and Optimization • Performance Tuning and Security Enhancements • Agile Project Management and Scrum Master Services • QA Services • Business Analysis • SEO Audits and Optimization • Ongoing Maintenance and Support 𝗪𝗼𝗿𝗸 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 Freelance Developer | Upwork | 2016 – Present • Successfully completed over 50 projects, ranging from small business websites to complex web applications. • Developed a custom e-commerce platform using React and Node.js that increased client sales by 30%. • Integrated third-party APIs for payment processing and shipping solutions. • Developed and deployed a machine learning model to predict customer churn for a SaaS client, resulting in a 15% reduction in churn rate. 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 • AWS Certified Solutions Architect • Google Cloud Professional Developer • Oracle Certified Java Programmer • IREB Certified Requirements Engineer • Certified Scrum Master 𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 I am available for both short-term projects and long-term collaborations. My typical working hours are flexible to accommodate different time zones. Let’s discuss how I can help you achieve your project goals! Feel free to reach out for a consultation or to discuss your specific requirements.

Summary: Full-stack web developer with 8+ years of experience building scalable web applications and digital solutions. Currently working as Web Developer and Co-Owner of LYNX Media, a Dutch digital agency specializing in web design, SEO, and conversion rate optimization. Specialized in translating Figma designs into pixel-perfect, responsive React, Vue, TypeScript, Next applications. European-based for seamless communication and collaboration. Technical expertise: Front-end: HTML5, CSS3, JavaScript, Vue.js, React.js Back-end: PHP, Laravel, Node.js, Python CMS: WordPress, Elementor, Shopify, custom CMS Databases: MySQL, PostgreSQL Tools: Git, GitHub, N8N automation, RESTful APIs What I deliver: - Custom web applications and websites from concept to launch - WordPress and Laravel development with clean, maintainable code - SEO optimization and conversion rate improvements - Database design following industry best practices - Responsive, user-friendly interfaces I combine technical skills with business understanding to create solutions that actually help clients achieve their goals. Comfortable working independently or collaborating with teams, and experienced with Agile/SCRUM methodologies. English proficiency: C2 (CPE certified) | Native Dutch speaker

PHP/Laravel/Wordpress/JavaScript/jQuery/Angular/React/Vue/Adonis/Flutter, PSD to HTML, CSS/SCSS/SASS/Bootstrap, HTML developer. About 10 years experience. Looking for long term cooperation with great results.

I am a Full-Stack Developer and ISTQB-certified QA Automation Engineer specializing in building and testing modern web applications and AI workflows. I help businesses build seamless frontends, automate backend processes, and ensure every deployment is 100% bug-free. With 5 years of experience in software architecture and quality, I bring a unique advantage to development: a rigorous, quality-first mindset. In my previous roles, my structural focus on testing and CI/CD pipelines helped reduce production error rates by 30%. Whether you need a custom Python automation script, a dynamic React dashboard, or a complete QA overhaul for your startup, I deliver secure, production-ready code. Core Services I Deliver: 1. Workflow Automation & AI Plumbing: Connecting platforms via APIs, building custom Python scripts to eliminate repetitive tasks, and structuring databases with PostgreSQL. 2. End-to-End Web Development: Building scalable, custom applications from the ground up using React, Python, and Java. 3. API Integration & Testing: Designing, building, and extensively validating REST APIs and SDKs using Postman to ensure flawless data flow. 4. Automated QA Frameworks: Setting up maintainable Playwright (TypeScript) and Selenium (Java/TestNG) automation suites from scratch to accelerate your release cycles.

Shopify developer and automation specialist based in Rotterdam, NL. 3.5 years of production experience on live stores (custom storefronts, Zapier and Make automations, Shopify Flow, and custom app development). I work with what you already have. Before introducing anything new, I look at the tools your clients are already paying for and ask how far we can get with those. New monthly costs only come in when there's no other way. My longest collaboration is Wonderful Dental, one of the fastest-growing dental companies in the US. Started as a hero animation in 2022. Now in year four, currently building AI-assisted ordering flows that have already shown a +$100 average order value increase in early testing. I fix what nobody else wants to touch.

Hello! 👋 I’m Paulo, a seasoned web developer with over 9 years of experience in crafting robust and dynamic web applications. My expertise lies in seamlessly integrating powerful backend systems using Java with sleek and responsive frontends powered by React. If you’re looking for a dedicated and skilled professional to bring your web projects to life, you’ve come to the right place! What I Offer 1. Full-Stack Web Development: From conceptualization to deployment, I handle all aspects of web development. Whether you need a complete web application or enhancements to your existing system, I’ve got you covered. 2. Backend Development with Java: I specialize in building secure, efficient, and scalable backend systems using Java. My proficiency in Spring Boot, Hibernate, and RESTful APIs ensures that your server-side logic is robust and reliable. 3. Frontend Development with React: I create interactive and user-friendly interfaces using React. With a strong focus on usability and performance, I ensure that your application not only looks great but also delivers a seamless user experience. 4. Database Management: I’m adept at designing and managing databases using SQL (MySQL, PostgreSQL) and NoSQL (MongoDB) technologies, ensuring your data is organized, secure, and easily accessible. 5. API Integration: Need to integrate third-party services or create custom APIs? I have extensive experience in developing and integrating APIs, enabling your application to communicate effectively with other systems. Why Choose Me? Proven Track Record: I have successfully delivered numerous web projects across various industries, from e-commerce and healthcare to finance and education. Quality Assurance: I prioritize clean, maintainable code and follow best practices to ensure your project is scalable and easy to manage. Effective Communication: I believe in transparent and consistent communication. You’ll always be in the loop with regular updates and feedback sessions. Client-Centric Approach: Your satisfaction is my top priority. I work closely with you to understand your needs and deliver solutions that exceed your expectations. Let’s Get Started! Ready to take your web project to the next level? Let’s connect and discuss how I can help you achieve your goals. Whether you have a detailed plan or just an idea, I’m here to transform your vision into a reality. Feel free to reach out to me with any questions or to schedule a consultation. I look forward to collaborating with you and building something amazing together! Skills & Tools Languages: Java, JavaScript, TypeScript, HTML, CSS Frameworks: Spring Boot, React Databases: MySQL, PostgreSQL, MongoDB Tools: Git, Docker, Jenkins Cloud Services: AWS, AzureDevops Let’s build something great together! 🚀

I'm a software developer with a strong background in React, Next.js, Symfony & Laravel. Also very experienced in mathematics and 3D/linear algebra. Enjoys building next-level web experiences, interactive 3D and serious games.

$50k ROI | 6+ Years Experience | Delivered for USPS, Airbus, Saudi Post, and Defense Clients I help enterprises bridge the gap between "cool AI demos" and production-grade systems that scale. Whether it's deploying 200+ real-time cameras in industrial environments, fine-tuning LLMs for 23x faster inference, or architecting Agentic workflows with LangGraph, I deliver high-performance solutions that drive measurable business ROI. 🚀 Recent High-Impact Wins Industrial IoT & CV (Sigrow): Architected a real-time plant health monitoring system deploying 200+ multispectral/thermal cameras, ingesting 2.3M images/month with YOLO-based segmentation and visual-thermal data fusion. LLM Optimization (Rapidev): Fine-tuned LLaMA 3.2-8B (LoRA/QLoRA) for enterprise NLP, achieving 23x faster inference and automating internal workflows via LangGraph/ReAct agents (50% reduction in manual effort). High-Scale AI Pipelines: Built an inference engine handling 100K+ daily requests (OCR, Speech, Translation), resulting in $50,000 annual cost savings. Edge Performance: Optimized IoT camera management by migrating from Python/Raspberry Pi to GoLang/MIPS, reducing bandwidth and operational costs while increasing API response speeds by 5x. Defense & Satellite: Built satellite object detection (YOLT/Solaris) with 95% accuracy on small targets (<10px), reducing manual inspection time by 65%. 🧠 Core Expertise Agentic AI & GenAI: LangChain, LangGraph, OpenAI, DeepSeek, LLaMA 3.x. Expertise in ReAct agents and multi-agent orchestration. Computer Vision (Edge & Cloud): YOLO (v5-v11), DeepStream, TensorRT, Triton Inference Server, GStreamer, 3D CNNs. Backend & ML Infra: Python, GoLang (specialized in high-performance IoT/MIPS), FastAPI, Docker, MQTT, RTSP, AWS (SageMaker, Bedrock, EC2). Data Fusion: Integrating multispectral, thermal, and sensor data for actionable industrial insights. 🏆 Why Work With Me? ✅ Gold Medalist & Researcher: MS in Computational Science (NUST) and published author in Deep Learning. ✅ Open Source Contributor: Contributed to TensorRTX and YOLOv7-Pose; PyCon Speaker. ✅ Full-Stack Ownership: I don't just train models; I build the GoLang backends, the Dockerized microservices, and the CI/CD pipelines to keep them running. ✅ Business-First Mindset: I focus on KPIs—whether it's a 60% revenue increase for a Japanese casino or a $50k reduction in API costs. 💬 Ready to scale your AI product? Let’s discuss your architecture and how we can build a scalable, production-ready solution together.

Stop building AI demos. I ship production-ready features with the rigor of an ex-Uber engineer. Full-stack AI: iOS/Swift + Python + LLM evals & guardrails. WhisperBoard (50K+ downloads, 4.8★). mcp-browser-use (850★). WHAT I DELIVER: • Production AI systems — not prototypes that break in prod • Evals, guardrails, and monitoring built in from day one • Handover-ready code in your repo, not spaghetti AI • iOS/Swift frontends + Python/agentic backends SIGNATURE PROJECTS: • WhisperBoard — On-device voice transcription app, 50K+ downloads, 4.8★ rating • mcp-browser-use — Open-source browser automation for AI agents, 850+ GitHub stars • Uber — Engineered critical wallet functionality used by millions globally • nu.nl — Core features for the Netherlands' highest-traffic news application 100% Job Success • Top Rated • $90K+ earned on Upwork