As you want to get the details of career after the course of B.Tech Computer Science so here it is for you:

B.Tech. Computer Science and Engineering Job Types

Professor - Computer Science & Engineering
Team Lead - Computer Science
Computer Programmer
Engineering Support Specialist
R&D Applications Engineer / Scientist
Academic Research Editor - Engineering
Tech Lead Software Engineering
Software Developer - Engineering Automation
Voice Engineer - Systems Engineering
Manager - Intellectual Property
Software Engineer - Market Data Engineering

Some job titles:-

Lecturer
Consultant
Programmers
Technician
Web Developers
System Designer
Help Desk Specialist
Networking Specialist
Data-warehouse Analyst
E- Commerce Specialists

Career in Private sector after B.Tech in Computer Science:
Some of the top IT companies offering placements for the B.Tech Computer Science graduates are listed below.

Infosys Technologies
Hewlett-Packard India
Cognizant Technology Solutions
Wipro
HCL Technologies
Cisco Systems India
Dell
Microsoft
IBM India
Oracle
Intel
Accenture
Tech Mahindra
HCL Infosystems
Patni Computer Systems
Mphasis
Satyam Computer Services
UniSolsInfosyatems
NIIT Technologies
Global Software
Alliant Technologies Private Limited
Allianz Cornhill Information Services Pvt. Ltd
Matrix Solutions Pvt. Ltd
All India Online Pvt. Ltd
Voicepack Infotech Private Limited

Career in Government sector after B.Tech in Computer Science:
National Thermal Power Corporation (NTPC)
Damodar Valley Corporation (DVC)
Oil and Natural Gas Corporation (ONGC)
Bharat Heavy Electricals Ltd (BHEL)
Food Corporation of India (FCI)
Centre for Development of Advance Computing (C-DAC)
Hindustan Electronics
Hindustan Aeronautics Limited (HAL)
Indian Railway
Indian Space Research Organization (ISRO)
Defence Research and Development Organization (DRDO)
Electronic Cooperation of India Limited (ECIL)
Airport Authority of India (AAI)
Steel Authority of India (SAIL)
Combined Defense Service (CDS)
New India Assurance Company Limited
Bharat Electronics Limited (BEL)