With an active backlog in BTech, can I get a job in the software field?

It really does not matter whether you complete your B.Tech or not if you have software skills. Many companies are allowing one or two backlogs when they select the students during campus interviews.

A lot of my friends who have one or two backlogs are already placed in good companies like Deloitte, Wipro, and others based on their technical knowledge by the end of 4th year, even before final exams. At the end of the day, you have to complete the graduation. But, for time being you can start working in the software field.