I've built and maintained Casita's large-scale CRM platform serving more than 300K users, with a focus on reliable backend architecture and high-load performance.
I optimized financial and booking reports by up to 85%, improved API response times by around 40%, and increased search performance by around 50% with Elasticsearch. I also reduced system load by around 60% through queues and schedulers.
I've integrated Stripe, PayPal, Airwallex, and PayFort through APIs and webhooks, alongside Mailmodo, Bird, Brevo, WhatsApp APIs, Firebase, and Pusher for scalable marketing, payment, and notification workflows.
Across Casita and Grand Solutions, I've delivered CRM and e-commerce platforms, monitored production systems with Sentry, and mentored junior developers.
