What are the job opportunities for software engineers in the government sector (India) with a good salary? What are the age limits and exam names?

Indian Central Government jobs for software engineers with approximate salaries mentioned below :

1. ISRO – Indian Space Research Organization, Scientist SC
2. DRDO – Defence Research and Development Organisation, Scientist B
3. BARC – Bhabha Atomic Research Centre, Scientific Officer
4. NIC – National Informatics Centre, Scientist B
5. NIELIT – National Institute of Electronics & Information Technology,Scientist B
6. ICERT – Indian Computer Emergency Response Team,Scientist B
7. STQC – Standardization Testing and Quality Certification, Scientist B
8. NTRO – National Technical Research Organisation, Scientist B
9. STPI- Software Technology Parks of India, Scientist B
10. IB – Intelligence Bureau, Deputy Central Intelligence Officer (Tech)