ISRO Scientist/Engineer 2026 — Complete Recruitment Guide

ISRO (Indian Space Research Organisation) needs no introduction — from Chandrayaan and Mangalyaan to commercial satellite launches, it's one of the most accomplished space agencies in the world. Getting recruited as a Scientist/Engineer at ISRO is a dream for many engineering and science graduates, and the good news is that the selection process is transparent and merit-based. This guide from ExamHub covers every aspect of ISRO recruitment for 2026.

Recruitment Channels

Route	Post	How It Works
ICRB Written Exam	Scientist/Engineer SC	ISRO conducts its own written test + interview
GATE Score Based	Scientist/Engineer SC	ISRO shortlists based on GATE score + interview
ISRO Centralized Recruitment (Direct)	Various levels	For experienced professionals

For fresh B.Tech/B.E. graduates, the ICRB (ISRO Centralised Recruitment Board) exam is the primary entry point. GATE-based recruitment is conducted separately and not every year.

ICRB Written Exam Pattern

Component	Details
Type	Objective (MCQ)
Questions	80
Marks	240 (3 marks per question)
Duration	90 minutes
Negative Marking	1 mark per wrong answer
Language	English only

The exam tests your core engineering knowledge at the B.Tech level. There is no general aptitude or English section — it's 100% technical.

Branch-wise Subjects Covered

Branch	Major Topics
Mechanical	Thermodynamics, Fluid Mechanics, Strength of Materials, Machine Design, Manufacturing, Heat Transfer
Electronics	Analog & Digital Circuits, Signals & Systems, Control Systems, Communication Systems, Electromagnetics, Microprocessors
Electrical	Power Systems, Electrical Machines, Control Systems, Power Electronics, Network Theory, Electromagnetics
Computer Science	Data Structures, Algorithms, DBMS, OS, Computer Networks, Theory of Computation, Compiler Design
Civil	Structural Analysis, Concrete Technology, Soil Mechanics, Fluid Mechanics, Surveying, Environmental Engineering

Difficulty Level

ISRO's technical paper is widely considered harder than GATE. The questions go deeper into application and problem-solving. Where GATE might ask you to identify a concept, ISRO asks you to apply it to a real engineering scenario and compute the answer.

That said, the syllabus overlap with GATE is about 85-90%. If you've prepared well for GATE, you're in a strong position for ISRO too.

GATE-Based Recruitment

ISRO periodically recruits Scientist/Engineer SC through GATE scores:

1. Notification — ISRO announces specific GATE papers and minimum score requirements
2. Application — Candidates apply online with their GATE scorecard
3. Shortlisting — Based on GATE score, typically 3-5x the number of vacancies
4. Interview — Conducted at ISRO centers (Bengaluru, Thiruvananthapuram, Ahmedabad, etc.)
5. Final Selection — Based on GATE score (70-85% weight) + Interview (15-30% weight)

GATE cutoffs for ISRO are high — expect 700+ for popular branches like Mechanical and Electronics.

Scientist/Engineer SC — Post Details

Parameter	Details
Pay Level	Level 10 (Rs. 56,100 - 1,77,500)
Starting Basic Pay	Rs. 56,100
Approximate In-hand	Rs. 60,000-75,000/month (location-dependent)
Age Limit	18-35 years (General), relaxation for reserved categories
Qualification	B.Tech/B.E. with minimum 65% aggregate (or CGPA 6.84/10)
Probation	1 year

ISRO Centers and Posting Locations

Center	Location	Focus Area
VSSC	Thiruvananthapuram	Launch vehicles (PSLV, GSLV, LVM3)
ISAC / URSC	Bengaluru	Satellites and spacecraft
LPSC	Thiruvananthapuram / Bengaluru	Liquid propulsion systems
SAC	Ahmedabad	Space applications, remote sensing
SDSC-SHAR	Sriharikota, Andhra Pradesh	Launch facility
ISITE	Bengaluru	Satellite integration and testing
MCF	Hassan, Karnataka	Master Control Facility for satellites
NRSC	Hyderabad	Remote sensing data
ISTRAC	Bengaluru	Telemetry, tracking, command network

Most engineers are posted to VSSC (Thiruvananthapuram), URSC (Bengaluru), or SAC (Ahmedabad). Sriharikota postings involve being at the launch center.

Preparation Strategy

For ICRB Written Exam

1. Master your core subjects — Identify the 5-6 subjects that carry the most weight in your branch and learn them deeply. Surface-level knowledge won't cut it at ISRO level.
2. Solve previous ISRO papers — ISRO papers from the last 8-10 years reveal the question style. Some specific topics appear repeatedly.
3. Go beyond GATE preparation — ISRO questions require deeper understanding. After GATE-level preparation, work through additional problems at a higher difficulty.
4. Numerical problem practice — ISRO loves calculation-intensive questions. You need to be fast with numbers.
5. Time management — 80 questions in 90 minutes is tight, especially with difficult questions. Skip, don't struggle.

For GATE-Based Route

1. Maximize your GATE score — For ISRO through GATE, you need a score well above 700. The preparation strategy should target accuracy and completeness.
2. Cover the complete syllabus — ISRO's GATE-based shortlisting uses the overall score, so leaving any topic unprepared risks losing marks.
3. Focus on the interview — Once shortlisted, the interview makes the difference. Prepare your technical fundamentals and know about ISRO's missions.

Use CalcHub for practicing complex engineering calculations.

Interview Preparation

The ISRO interview is technical and thorough:

1. Core subject questions — Expect in-depth questions from your engineering branch. They may ask you to derive equations or solve problems on the whiteboard.
2. Final year project — Explain your project clearly: problem statement, methodology, results, and limitations.
3. ISRO missions knowledge — Know about Chandrayaan, Mangalyaan, Gaganyaan, PSLV vs GSLV, recent satellite launches. The panel expects genuine interest in space.
4. Why ISRO? — They want people who are genuinely passionate about space technology, not just looking for a government job.
5. Basic aptitude — Occasionally, they test problem-solving approach through puzzles or open-ended engineering questions.

Best Books

Subject Area	Recommended
Branch-specific	Same GATE preparation books (standard textbooks for your branch)
ISRO Previous Papers	Compiled ISRO papers (available from Made Easy, IES Master)
General Reference	Engineering Mathematics by Kreyszig (for numerical methods)

5-Month Study Plan

Month	Focus
1	Core subjects foundation — cover high-weightage subjects thoroughly with standard textbooks
2	Complete remaining subjects + start solving GATE previous year papers
3	ISRO previous year papers + advanced problem-solving + identify weak areas
4	Full-length mocks (2-3 per week) + weak area intensive revision + numerical speed building
5	Final revision + light mock practice + ISRO mission awareness for interview + relax before exam

Preparation Tips

1. ISRO papers are harder than GATE — plan accordingly — If you're scoring 55-60 in GATE mocks, you might score 40-45 in an ISRO paper of similar length. Adjust expectations.
2. Negative marking is 1 mark (out of 3) — That's 33% of the question's value. Don't guess randomly.
3. The technical-only paper is a blessing and a curse — No GK or aptitude means you can focus entirely on engineering. But it also means there's nowhere to make up marks if you're weak technically.
4. ISRO respects passion — In interviews, candidates who demonstrate genuine excitement about space exploration and ISRO's work consistently perform better.
5. Apply every cycle — ISRO recruitment is not annual. Notifications come irregularly. Apply every time you're eligible.

Common Mistakes to Avoid

1. Preparing only at GATE level — ISRO questions go a notch higher. Solve ISRO-specific previous papers to calibrate your preparation.
2. Not knowing ISRO's missions — Walking into an ISRO interview without knowing about Gaganyaan or the recent Chandrayaan missions is a disqualifier in practice.
3. Ignoring numerical problem speed — The exam is time-constrained. Slow calculations mean fewer attempted questions.
4. Applying to only one branch — If you have an M.Tech or relevant experience, check if cross-branch openings exist.
5. Giving up after one attempt — ISRO recruitment cycles are infrequent. Many successful candidates cleared it on their second or third attempt.

Frequently Asked Questions

Can M.Sc graduates apply for ISRO Scientist/Engineer?

ISRO Scientist/Engineer SC posts are typically for B.Tech/B.E. holders. M.Sc graduates can apply for ISRO Research Scientist posts, which are recruited separately.

Is there a bond at ISRO?

There is no bond. Scientist/Engineer SC is a permanent government position with a 1-year probation period.

What is the difference between ISRO and DRDO recruitment?

Both are government R&D organizations, but ISRO focuses on space technology while DRDO focuses on defence. ISRO's ICRB exam is 100% technical, while DRDO SET includes a General Ability section. ISRO interviews tend to be more technically intensive.

How often does ISRO recruit?

There's no fixed schedule. ISRO recruits based on vacancy requirements. Some years have multiple recruitment drives; other years may have none. Check isro.gov.in regularly.

Free Resources

• ISRO official website — isro.gov.in (recruitment notifications under "Careers")
• ICRB portal — icrb.isro.gov.in
• Previous papers — Download from MyPDF

Visit SarkariNaukri for ISRO recruitment notifications and exam date updates.

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