Sadik Avllaj

Maintained and developed backend applications using Python (Flask), PHP (Laravel, Symfony), and React. Worked with REST APIs, third-party integrations, Stripe payments, AWS S3/SES, and microservice-based CRM systems using Node.js and TypeScript. Implemented shopping cart features, document management systems, automated CI/CD pipelines with Bitbucket and SonarQube, and wrote unit/functional tests with PHPUnit.

Maintained and improved the Myticket.al PHP application by enhancing backend architecture using SOLID principles, dependency injection, PHP types, and automated tests. Implemented payment integrations (BKT, Paylink, UPay), Redis queue retry systems, email/SMS notifications, and frontend interfaces with JavaScript and jQuery. Also configured CI/CD pipelines, staging deployments, and Dockerized environments.

Maintained and developed a Billing and Invoice System for a Water Utility Company using Symfony. Implemented REST APIs with Swagger, improved report generation and SQL performance, optimized stored procedures and database schema, and enhanced CSV import scripts. Added daily database backups, RabbitMQ-based async queues, CI pipelines with Bitbucket, and automated API/integration testing.