Hatim L.

I build and scale production SaaS applications with Laravel, PostgreSQL and React/Next.js. I specialize in complex billing, Stripe, multi-tenancy, third-party integrations, APIs and established SaaS codebases. I'm a Senior Full-Stack Engineer with 7+ years of experience building scalable SaaS platforms and complex production systems. My strongest expertise is in Laravel backend development, API design, SaaS architecture, performance optimization, and React/Next.js applications. I've worked directly with founders and CTOs to take products from concept to production, as well as maintain and extend large existing applications. Some of the systems I've worked on include: - Qfactor: Multi-tenant SaaS for engineering firms. Laravel + React, Stripe subscriptions, payments, seat-based billing, setup fees, webhooks, grace periods, Customer Portal, and PandaDoc e-signature workflows. - Livemixtapes and Livemixtapes Pro: Rebuilt and modernized a large music publishing and streaming platform using Laravel, React, Next.js, TypeScript. Eino AI Network Planner: AI-powered network planning software that converts architectural plans into interactive 3D building models and helps optimize Wi-Fi coverage. Built with React, TypeScript and Three.js. YouCan / YouCan Pay: Worked on a large-scale e-commerce platform handling millions of requests per day and on its payment processor/e-wallet infrastructure. Core expertise: Laravel, PHP, PostgreSQL,/MySQL, React, Next.js, TypeScript, Stripe, REST APIs, SaaS architecture, third-party integrations, queues/background processing, performance optimization. I'm particularly effective on SaaS products where billing logic, integrations, data flows and existing codebases have become complex and require an experienced engineer rather than just feature implementation.