You are not allowed to skip the Salah altogether in any circumstance. Rather you should try to pray in whatever way you can; standing, sitting or whatever possible. If you cannot pray each prayer on time, you are allowed to combine Zuhr and Asr by praying. Likewise, you can combine Maghrib and Isha in the same manner.

 

If there is no way to do your prayer at all in your job, then you should consider leaving this job.  You should try to get another job where you will not face such difficulties; what benefit you gain from a job that helps you sustain your body while depriving you of salvation in the next world?

 

Never despair of the mercy of Allah. Allah has promised us that ‘Whoever is mindful of Allah will be taken out of difficulties.” (Qur’an: 65: 2), and “And whoever is mindful of Allah (should know that) He will make his affair easy for him.” (Qur’an: 65:4)

 

And the Prophet (peace be upon him) said, “Whoever clings to istighfar (seeking forgiveness of Allah) Allah will appoint for him/her a way of out of all troubles and provide for him/her sustenance in ways they would never able to foresee.”

 

Almighty Allah knows best.