Hi there,
Thanks for this opportunity! I have 14+ years of experience in Web development and after reading your requirements I'm 101% confident I can help you with your task. In fact, just to test my programming knowledge, you can throw any kind of problem at me right now (not necessarily related to your project) and I'll solve it for you.
In regards to your project, the problem is that the feed has 160k products. You are trying to export 160k products using PHP. That's all lot of processing power and I'm not sure why the PHP does not time out at some point. I have a solution for your to export those feeds avoiding the PHP timeout and not affecting the speed of the website. After I will help you with this you will only want to work with me and you will fire your current developer as this problem has a logical solution and someone with experience would have found it without any issues.
When you choose to work with me, you get a partner that actually responds to messages/emails/calls, gets things done and is committed to helping you succeed.
Moreover, my english is great so you can be sure that there will be no language barriers.
When you're available, let's discuss your requirements in detail and then will check and give you my final quote and ETA. If we decide we're both on the same page, we will then take it further and get this done ASAP.
Looking forward to helping your reach your goals and build a great business relationship.
Regards,
Kalin