Fajar Windhu Z.

I'm a Full-Stack Software Engineer specializing in building and scaling marketplace platforms for the European, UK, and US markets. My experience spans cross-border e-commerce, payment processing, taxation, shipping, localization, and marketplace operations, with a strong focus on backend architecture using PHP and Laravel. I've worked on features involving international payments, order management, refunds and cancellations, invoicing, VAT and sales tax calculations, currency conversion, exchange rates, shipping integrations, and marketplace workflows. I'm familiar with regulations and business requirements such as GDPR, EU VAT, UK VAT, US sales taxes, PCI-aware payment integrations, consumer refund policies, and localized user experiences. My experience includes: * Multi-vendor marketplace architecture * Cross-border e-commerce workflows * International payment gateway integrations * Authorization, capture, void, refund, and dispute payment flows * EU VAT, UK VAT, and US sales tax support * Multi-currency pricing and foreign exchange (FX) management * Product catalog and inventory management * Order lifecycle and fulfillment systems * Shipping carrier integrations and shipment tracking * Invoice and billing generation * Localization (i18n), currencies, date/time, and regional formatting * Search optimization and Elasticsearch * REST APIs and third-party integrations * Performance optimization and scalable backend architecture Beyond technical implementation, I enjoy solving complex business problems. I'm a passionate problem solver and debugger who enjoys collaborating with cross-functional teams to design reliable systems, improve developer experience, and resolve challenging production issues throughout the software development lifecycle. I'm a fast learner who enjoys exploring new technologies and continuously improving my engineering skills to build products that serve global customers. Main Tech Stack Backend • PHP • Laravel • Node.js • TypeScript Frontend • React • Next.js • Vue.js • JavaScript • Tailwind CSS • Bootstrap Database & Infrastructure • MySQL • Redis • Docker • Linux • VPS • Vercel • Netlify Tools • Git, GitHub, GitLab • Postman • Jira • Trello • Asana Additional Experience ✓ 6+ years of professional web development ✓ Nearly 2 years of continuous collaboration with the same client ✓ Experience mentoring developers ✓ Experience building and maintaining marketplace platforms ✓ Experience integrating AI capabilities I value clear communication, clean code, and long-term relationships. If you're looking for a dependable Laravel developer who can contribute to both backend and frontend development, feel free to send me a message. I'd be happy to discuss your project.