Work is not an excuse to say bye bye to your spirituality. It's sad how during our youth, we can completely get distracted from our goal main goal in life - to attain nearness to Allah. Many Muslims will go to work with pure intentions but sometimes the environment can subconsciously affect them. There are many things in a typical office job which should make you feel very cautious.
(1) Unnecessary chatting with the opposite gender.
At work no one will care whether you're a practicing Muslim or not, those of the opposite gender will defs open up to you at some point. You have to be strong and to not let things escalate, regardless of whether you're into someone or not. If you have a female/male colleague who sits next to you, only talk work related stuff with them, don't feel the need to always talk about everything, like "how is your cat?" etc.
(2) Say no to work parties and dinners
Gosh you won't believe how many Shias who go to the majlis of Imam Hussein (as) are totally okay with work parties (even Christmas ones) where there is free mixing, music and alcohol being served. Work dinners should also be a big no if it's in a bar.
(3) Pray your Duhr/Asr salah
During your lunchbreak, take a few minutes out to pray salah. There is a difference between someone who prays on time vs someone who delays salah. Your spirituality will take a big blow if you say to yourself "for the next 10 years of my life I will always delay my salah". What a sad state to be in! I'd rather leave a job which prevents me to pray my salah on time.
(4) Don't waste time at work, take your job seriously given you're being paid.
From Sayed Sistani's website:
Question: A Muslim works in a non-Muslim country, in a private office, or in a government office, or on contract for a specific project where he is paid by the hour. Is it permissible for him to waste some hours or work negligently or intentionally delay the job? Does he deserve the full wages?
Answer: This is not allowed; and if one does it, he is not entitled to full wages
(5) Shaking Hands of the opposite gender.
Very difficult but defs doable. It's clear in our books of fiqh that we can't shake the hands of the opposite gender.
(6) Don't gossip
Some people at work can be very shameless as they love to talk bad about other employees. As a mu'min, you have to be very fair and just. Don't let someone's biased opinion affect your view on another employee. Never take part in gossip!
I've just listed the points which I came up with, a lot of them are very obvious, but are to be taken very seriously.