Upvote:2
It comes down to the immigration officers wanting to be sure you're really doing what you say, and omitting this IT job might look 'suspicious' to them.
You need to allay this suspicion. Evidence of a contract in your home city, an apartment lease, a letter from your employer showing your intention to return to your job, all these go a long way towards giving them comfort in the certainty you may return.
Saying that, after your previous two rejections, they are probably likely to be stricter in their checks. Make sure not to leave anything out, even if it's just extra information, and consider getting an immigration lawyer / specialist to assist you with your application.