You will start your journey in the Civil Services as a Junior Officer. Here you will be on probation for two years. The next rank is Senior Officer who works as Under Secretary in the State/Central Government.
Your next step would be Deputy Secretary. You could be the Director of Public Sector Enterprises. You could also head other developmental and administrative organisations.
The highest rank is the Secretary/Cabinet Secretary of a Ministry. You could also head a department of the Central/ State Government. You could also be the Chief Secretary of a State Government.
Most of the junior officers do administrative work that would help senior officers. Your power would increase as you ascended the ladder, and you would set policies. You will help them in making administrative decisions.