Praise be to Allaah.
Pray whatever you can of taraaweeh in congregation with the
imam. It does not matter if you leave for work after two or four or six
rak’ahs, etc. Then complete the prayer at home and pray witr at the end.
If you find a mosque that prays early and you can complete
the prayer with them and then go to work, this is better, because the
Prophet (peace and blessings of Allaah be upon him) said: “Whoever
prays qiyaam with the imam until he finishes, it will be written that he
spent the whole night in prayer.” Narrated by al-Tirmidhi, 806; classed as
saheeh by al-Albaani in Saheeh al-Tirmidhi.
And Allaah knows best.