How to Become an ISRO/DRDO Scientist

Two major organisations, several routes

The Indian Space Research Organisation (ISRO) and the Defence Research and Development Organisation (DRDO) are major government scientific organisations that recruit scientists and engineers. ISRO works on space research and applications; DRDO works on defence research and development.

There is no single combined exam for both. Each organisation runs its own recruitment, and the route depends on the role and discipline. This guide outlines the common entry routes for fresh graduates and where to confirm the details; it is general career information, not career advice, and it makes no claim about pay.

Joining ISRO: the ICRB route

ISRO recruits entry-level engineers through the ISRO Centralised Recruitment Board (ICRB), most commonly for the post of Scientist/Engineer 'SC' in core engineering disciplines such as electronics, mechanical and computer science.

The typical baseline is a first-class BE/B.Tech (or equivalent) in the relevant discipline, with final-year students often allowed to apply subject to meeting the qualification at selection. Some ICRB notifications use a valid GATE score as part of shortlisting, and the process generally combines a written test and/or GATE score with an interview. The exact qualifying marks, GATE requirement, fees and stages vary by notification — confirm them on the official ISRO careers page.

• Post: Scientist/Engineer 'SC' (entry level), in core disciplines
• Baseline: first-class BE/B.Tech (or equivalent) in the relevant field
• Process: written test and/or GATE score, then interview — per the notification

Joining DRDO: the RAC route

DRDO recruits entry-level scientists through its Recruitment & Assessment Centre (RAC), commonly for the post of Scientist 'B'. RAC also handles recruitment for some associated organisations and encadred posts under the Ministry of Defence.

The typical baseline is a first-class Bachelor's degree in engineering or technology (or equivalent) in the relevant discipline. Several RAC routes for Scientist 'B' use a valid GATE score in the relevant subject, followed by a personal interview. The exact eligibility, GATE-paper mapping, age limits and stages are set in each RAC advertisement — verify them on the official RAC website.

• Post: Scientist 'B' (entry level)
• Baseline: first-class BE/B.Tech (or equivalent) in the relevant discipline
• Process: often a valid GATE score plus interview — per the advertisement

The role of GATE

The Graduate Aptitude Test in Engineering (GATE) is a national qualifying examination in engineering and science. A valid GATE score is used in several ISRO and DRDO recruitment routes as a shortlisting input, though specific posts and notifications differ in whether and how they use it.

GATE is conducted by the IITs and IISc; some recruitment routes also allow alternative paths (for example, certain notifications treat graduates of premier institutes differently). Always read the specific ISRO or DRDO notification to see exactly how GATE is used for the post you are targeting.

How to prepare and where to verify

Preparation usually means building strong fundamentals in your core engineering discipline, since both the written tests and GATE-based routes assess subject knowledge and aptitude. Following each organisation's official careers page for new openings is essential, as recruitment is cyclical and post-specific.

No course or resource can guarantee selection; these roles are competitive and merit-based. For every eligibility rule, GATE requirement, fee, date and stage, rely only on the official ISRO and DRDO/RAC websites and verify before applying.