As per your need, I am giving you list of the government companies in which B.Tech computer science and engineering students are eligible to apply.

ISRO
Post: Scientist
Selection Procedure: Written + Interview

DRDO
Post: Scientist, JRF
Selection Procedure: Written + Interview

NIC
Post: Developer
Selection Procedure: Written + Interview

Coal India Limited (CIL)
Pay Scale: 20,600 – 46,500
Selection procedure: Written + Interview

Bharat Electronics Limited (BEL)
Pay Scale: 16,400 – 3% – 40,500
Selection procedure: GATE+ GD + Interview

Indian Oil Corporation (IOCL)
Pay Scale: 9.00 lakhs per annum
Selection procedure: GATE +Interview

Steel Authority of India Limited (SAIL)
Pay Scale: 20600-3%-46500
Selection procedure: Written+ Interview

Heavy Engineering Corporation Limited (HEC)
Rs.16,000/- to Rs.40,000/-
Selection procedure: GATE +Interview

Hindustan Aeronautics Limited (HAL)
Pay Scale: Rs. 6 to 6.5 lakhs
Selection procedure: Written +Interview

Bharat Petroleum Corporation Limited (BPCL)
Pay Scale: 24,900 – 50,500
Selection procedure: GATE + GD+Interview+ Psychometric Test

Oil and Natural Gas Corporation Limited (ONGC)
Pay Scale: 24,900 – 50,500
Selection procedure: Written + Interview

Vizag Steel Plant
Pay Scale: Rs.20,600/--- 3%-- 46,500/-
Selection procedure: Written + GD + Interview

Electronics Corporation of India Limited (ECIL)
Pay Scale: Rs. 4 lakhs per annum
Selection procedure: Written + Interview

Odisha Power Generation Corporation (OPGC)
Pay Scale: Rs. 4 lakhs per annum
Selection procedure: Written + GD + Interview

Dakshin Gujarat Vij Company Limited (DGVCL)
Pay Scale: Rs.17,300/- to Rs.38,610/-
Selection procedure: Written + Interview