John W.

Senior Full-Stack Engineer | APIs, Payments & Scalable Web Systems

I build scalable, production-ready web applications and APIs that handle real users, real data, and real transactions. Over the past 5+ years, I’ve delivered systems used by thousands of users, including ERP and HRMS platforms, analytics dashboards, and payment-enabled applications with M-Pesa integrations. I specialize in backend-heavy full-stack development — designing systems that are fast, secure, and built to scale from day one. 🚀 What I deliver: 1. Full-Stack Applications React, Vue, Laravel, Node.js — from idea to production 2. Backend & API Engineering High-performance REST APIs with clean, scalable architecture 3. Payment Systems M-Pesa, Stripe, and custom transaction workflows 4. Performance Optimization Reduced query times, faster APIs, and efficient caching strategies 5. Dashboards & Data Systems Real-time analytics, reporting, and data visualization 💰 Why clients work with me: 1. I build systems that stay reliable under real-world load 2. I focus on business outcomes, not just code 3. I communicate clearly and deliver on time 4. I write clean, maintainable, production-grade software If you need a developer who can design and build systems that scale and handle real transactions — I’m ready to help. — John