Hello Izabela,
Please discuss with me more in details about your project (Bitrix Framework, Bitrix24 developer call center integration, Zend Framework) so that we can help you get this project done. I'm an expert in CakePHP, JavaScript, MySQL, PHP, Software Architecture with 10 years and very much interested to work with you.
I would love to collaborate with you for your project and want to create a strong business relationship with you. Depending on the functional aspect we can be able to quote you with the concrete budget and timeline. So, may I know when you will be online for more discussion? Awaiting to hear back from you soon.
Best Regards,