بسم الله الرحمن الرحيم
(Fatwa: 82/114/L=2/1438)
Jumuah salah is fardh-e-Ain (obligatory) when all the conditions are found. It cannot be missed without a Shariah reason. So you should try to offer Jumuah salah in the city whether in first time or last time. And if it happens occasionally then you should take leave for some time so that you could offer Jumuah salah. You should not miss Jumuah salah.
وهي فرض عين كذا فى التهذيب ، قال أبو دقاق : ليس له أن يمنعه فى المصر .(هنديه 1/205 ط: زكريا)
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband