India's space programme has long been synonymous with stability, prestige and national pride. For decades, the Indian Space Research Organisation (ISRO) represented the pinnacle of scientific achievement for aerospace engineers, delivering landmark missions on modest budgets—from Chandrayaan and Mangalyaan to the recent SpaDeX docking mission. But today, the organisation faces an unusual problem. It is not struggling because of launch failures or funding shortages, but because experienced scientists are leaving.
More than 100 scientists have reportedly resigned or sought voluntary retirement in recent months, prompting the Department of Space (DoS) to tighten resignation rules, particularly for those associated with flagship programmes such as Gaganyaan. While the numbers account for less than one per cent of ISRO's workforce of around 14,600 employees, the departures involve specialists whose expertise has been built over decades and cannot be replaced overnight.
The development reflects a much larger transformation underway in India's space sector. As the country moves from a government-led model to a broader commercial ecosystem, ISRO is no longer the only destination for ambitious scientists.
The single biggest factor behind the talent shift is the rapid emergence of India's private space industry.
Until 2020, ISRO dominated virtually every aspect of India's space activities. That changed after the government opened the sector to private participation through reforms that established IN-SPACe as the regulatory body and encouraged private investment.
The results have been dramatic.
Companies such as Skyroot Aerospace, Agnikul Cosmos, Pixxel, Bellatrix Aerospace, Dhruva Space, Digantara, GalaxEye and SatSure are now developing launch vehicles, satellites, propulsion systems, earth observation technologies and space-based services. Venture capital investment has increased sharply, international collaborations have expanded and India's space startup ecosystem has grown into one of the world's fastest expanding.
For scientists, these companies offer something government organisations often cannot.
Compensation packages are significantly higher, stock options provide long-term wealth creation, decision-making is faster and talented engineers often receive leadership responsibilities much earlier in their careers. Instead of working within rigid bureaucratic structures, scientists get opportunities to build technologies from scratch and see products reach the market more quickly.
Many startups are also being led or mentored by former ISRO scientists, making the transition easier for younger engineers who wish to remain within the space ecosystem.
Higher salaries alone do not explain the resignations.
Several current and former officials have privately pointed to organisational issues that have gradually become more visible as ISRO's mission portfolio has expanded.
The agency has witnessed delays in multiple high-profile missions, including the first uncrewed Gaganyaan flight, SSLV operational missions, GSLV launches and industry-built PSLV programmes. The PSLV setbacks earlier this year also slowed launch schedules while detailed public explanations have remained limited.
Inside the organisation, some officials have reportedly expressed concerns over increasingly centralised decision-making, with technical and administrative approvals taking longer than before. Such perceptions, whether entirely accurate or not, can affect morale in research organisations where innovation depends upon rapid technical decisions and professional autonomy.
Unlike startups, where teams often move from concept to hardware within months, government procedures naturally involve multiple layers of approval, procurement rules and administrative oversight. As India's private ecosystem accelerates, this contrast becomes increasingly apparent.
On paper, losing around 100 scientists from a workforce exceeding 14,000 may appear manageable.
In reality, space organisations function very differently from conventional institutions.
Engineers working on launch vehicles, cryogenic propulsion, spacecraft guidance, docking technologies or human spaceflight acquire highly specialised knowledge through years of mission experience. Their understanding extends beyond textbooks into lessons learned from actual launches, failures, simulations and system integration.
This institutional memory is particularly valuable as India prepares for some of its most ambitious missions.
The Gaganyaan human spaceflight programme, Chandrayaan-4 lunar sample return mission, the Bharatiya Antariksh Station, Venus Orbiter Mission and future reusable launch vehicle technologies all require continuity in technical leadership. Replacing experienced scientists with newly recruited graduates inevitably creates a learning gap.
That explains why the Department of Space has now required resignations from scientists working on critical national missions to receive approval at the departmental level rather than through routine administrative processes.
Many experts believe the challenge is structural rather than temporary.
Space agencies such as NASA and the European Space Agency operate through hybrid employment models. They combine permanent civil servants with project-specific experts, contractors, research institutions and private companies. This allows flexibility while preserving institutional knowledge within core scientific teams.
ISRO, by contrast, still relies predominantly on a traditional government employment structure designed for an era when it single-handedly executed almost every national space mission.
As India's commercial space industry matures, ISRO's role may increasingly evolve.
Instead of manufacturing every component internally, the agency could focus on mission architecture, advanced research, human spaceflight, planetary exploration, reusable launch systems, nuclear propulsion and next-generation technologies, while private industry undertakes routine manufacturing, satellite production and commercial launch services.
This division of responsibilities is already beginning through NSIL, IN-SPACe and greater industry participation in PSLV production.
The Department of Space's latest directive may temporarily slow the outflow of scientists working on sensitive missions, but administrative restrictions alone are unlikely to solve the underlying problem.
Retention depends on creating an environment where scientists see long-term professional growth within the organisation.
That includes competitive compensation where feasible, faster promotion pathways, greater autonomy for project teams, opportunities to collaborate with industry and academia, modern research infrastructure and clearer recognition for technical leadership.
Equally important is reducing procedural delays that can frustrate researchers accustomed to solving engineering problems rather than navigating administrative processes.
Many experts have also argued that scientists should be allowed greater mobility between ISRO, academia and private companies without permanently leaving the national space ecosystem.
Ironically, ISRO's talent challenge is partly a consequence of its own success.
For decades, the organisation trained generations of world-class engineers because there were few alternative employers in India's space sector. Today, those very scientists have helped create an ecosystem vibrant enough to compete with ISRO for talent.
That is not necessarily a negative development. Mature space powers such as the United States thrive because talent flows between NASA, private companies, universities and research laboratories.
India is beginning to witness a similar transition.
The real challenge is ensuring that ISRO remains the country's premier centre for frontier research and national missions while the private sector drives commercial innovation.
India's space ambitions have never been larger. Retaining experienced scientists will require not just preventing them from leaving, but giving them compelling reasons to stay. If managed well, ISRO and the private sector can become complementary pillars of India's space future rather than competitors for the same talent.