Why I Left Wall Street to Build 3D Printed Rockets in India

ELI5/TLDR

Srinath Ravichandran grew up watching ISRO launches from his Chennai rooftop, detoured through electrical engineering and Wall Street quant finance, then quit everything to co-found Agnikul Cosmos — a company that 3D-prints single-piece rocket engines and launches them from mobile launchpads. The core insight: satellites are shrinking (following the semiconductor trend) while rockets keep getting bigger, so there’s a market gap for small, cheap, dedicated rides to orbit. India’s 2020 decision to privatize space gave him the runway, and ISRO’s decades of credibility gave him the global respect to fundraise without a PayPal exit.

The Full Story

The Accidental Rocket Boy

Srinath grew up in Chennai with physics teachers for a mother and aunt, and ISRO’s Sriharikota launch site 100 km north. From his terrace he could watch rockets crawl upward — no telescope needed, just a thing that looks like nothing else in the sky. At 16, he walked into an ISRO clean room for a student competition and came within a foot of touching a geostationary satellite. The panel chair, Dr. Kasturirangan, asked him how far away geostationary satellites orbit. Srinath knew the answer cold: 36,000 km. He said 360 km. Did not make the cut. But the mark was permanent.

The Wall Street Detour

Family wisdom: do electrical engineering, keep your options open. He did, at Anna University’s College of Engineering Guindy — the same campus where India’s first non-ISRO satellite (Anusat) was being built two buildings over, in a lab he couldn’t get into. After graduating he joined ABB, commissioning industrial motors large enough to walk through. Then FOMO hit. Friends in finance were making 2x his salary, and at that age, salary is the only metric anyone can easily measure.

He found a program called “financial engineering” at Columbia — the word “engineering” let him tell his family he was still in engineering. The actual coursework was the hardest math he’d ever done: building models to predict randomness using the same probability theory that underpins quantum mechanics. He arrived in New York in June 2008. Lehman Brothers collapsed in September. Half the city was blaming his exact field of study for the crisis. The other half hired him to make sure it wouldn’t happen again.

He landed at AXA as a portfolio quant, building hedging models for fixed-income instruments. The key lesson from six years on Wall Street: always have the simplest version of the right answer. You get 10-15 seconds with the CIO. If they ask what happens when the market moves 2%, you cannot be opening Excel. You build rules of thumb. He still uses this in rocketry — “what happens if mass goes up 100 kg?” — same muscle, different payload.

On the side, he attended film school for four straight years after market close. The shoot-planning discipline — short division, scheduling dozens of people into tight windows — creeped directly into how he plans launch operations today.

The Pivot

“It took a lot of effort to come out of a well-paying job. All my friends were talking about getting higher promotions, buying bigger houses. And here I’m thinking: is finance even right for me?”

He quit. Did a second master’s in aerospace engineering at UIUC (corn fields, middle of nowhere), then moved to California to be near SpaceX and the LA space meetup circuit. A useful discovery: people at those meetups listened to him purely because he was from India. ISRO had already proven you could do capital-efficient space missions. The 2014 Mars Orbiter Mission and the 2017 record of 104 satellites on a single PSLV had earned India serious credibility.

But being Indian on an H-1B in the US space sector also meant doors literally closed — dual-use technology meant no clearance, no entry. Rockets were hard enough without also solving for paperwork. He sent 80-90 cold emails to professors who had access to rocket testing facilities. Most replied with life advice (“shouldn’t you be settling down?”). One — Prof. Satya Chakravarthy at IIT Madras — just said “yeah, let’s build rockets” on a Skype call. That was the ticket back to Chennai.

The Agnikul Thesis

The disconnect Srinath spotted: satellites follow the semiconductor trend (smaller, lighter, more efficient), but rockets keep getting bigger. Forcing small satellites onto big rockets is like making everyone ride the train when what they need is a cab.

Agnikul’s three bets:

3D-printed engines. Traditional manufacturing is subtractive — you start with a block of metal and chisel away. 3D printing is additive — you lay metallic powder and fuse it with laser beams, layer by layer. Srinath calls it “three-dimensional dosa-making.” The engine comes out as a single piece, patented globally, reducing human error (the thing that actually kills people in rocketry — a misqualified O-ring, a bad washer).
Mobile launchpads. Big rockets need enormous fixed infrastructure. Small rockets can shrink everything. Every space mission has an optimal launch point on Earth’s surface where the planet’s rotation gives you a free tailwind into orbit. A mobile pad lets you chase that sweet spot instead of launching from wherever the concrete happens to be.
Modular engine clustering. Instead of one engine per rocket, split the thrust across multiple smaller engines. Need less power? Remove an engine. The bill of materials shrinks, and the economics work even at small scale.

“There is no such thing as a low-quality rocket. It either goes to space or it doesn’t. You can’t cut cost by cutting quality. You have to cut cost by figuring out tech that works at the price.”

Policy as Catalyst

When Srinath returned to India in 2017, there was no policy framework for private rocket launches. Fifty percent of investors asked: why not do this in the US? Then in May 2020, during COVID, the government announced the Atmanirbhar Bharat space reforms on a PowerPoint slide sandwiched between agriculture and fisheries. Srinath emailed the ISRO chairman that same day. He got a reply in two days. By July, the IN-SPACe committee was formed. Agnikul was among the first proposals.

The setup is clever: IN-SPACe sits outside ISRO but inside the Department of Space — a “promotion and authorization center,” not just authorization. The distinction matters. Deep tech founders need help telling the story, not just getting permits. The rocket business, after all the engineering complexity, is just cargo business: rupees per kilogram.

Six years later, hundreds of space startups exist in India, none founded by billionaires. Srinath puts it plainly: he didn’t have a PayPal exit. Neither did anyone else in Indian space tech.

Space as Platform

The forward-looking bit: space isn’t just a vantage point for photos and signals anymore. It’s a manufacturing environment. In orbit you get vacuum, near-absolute-zero temperatures (3-4 Kelvin), and microgravity — conditions that are absurdly expensive to maintain on Earth. Agnikul has patented technology to repurpose their rocket’s upper stage (normally discarded as debris) as an orbital platform, and they’re now working on hosting data centers on it. The pitch: solar energy is more efficient in direct sunlight, and the dark side of the satellite radiates heat into space for free. They had this in their 2019 pitch deck. The rest of the industry caught up in the last few months.

On Resilience

When asked what aspiring space engineers should focus on, Srinath skips the technical answer:

“If you have a craving for something, just wait for one hour and then go do it. That builds the ability to not instantly gratify yourself.”

The propulsion team’s internal nickname: the Rocket Plumbing Team. His mother asked why he was talking like a plumber when he was supposed to be building rockets.

The launch itself: 17-18 people huddled in a cargo container converted to a mission control room (mobile, naturally). When the rocket launched, everyone broke down crying.

“We thought we were pushing the rocket up. The rocket was actually pushing us up.”

Claude’s Take

claude_score: 5 — This is a perfectly pleasant founder interview on a government podcast, and it delivers exactly what that format promises: an inspirational life arc, some genuine technical nuggets, and a large helping of gratitude toward policy initiatives. The 3D-printing thesis and mobile launchpad concept are legitimately interesting and well-explained. The data-centers-in-space angle is thought-provoking.

What drags the score to the middle of the range: the interview is structurally a puff piece. The host never pushes back on anything, never asks about competitors (Skyroot, for instance, launched India’s first private rocket before Agnikul), funding specifics, technical failures, or the gap between vision and current capability. Srinath is clearly sharp and self-aware — the Columbia/Lehman timing story, the “I didn’t have my PayPal exit” line, the plumbing anecdote — but the format doesn’t let him be anything other than upbeat. There’s a roughly 15-minute stretch about government policy that reads more like a testimonial than analysis. The interviewer seems to be ticking boxes rather than following threads.

The technical content that does come through is solid and accessible. The satellite-shrinking-while-rockets-grow insight is a real market observation, not just a pitch line. The single-piece 3D-printed engine is genuinely novel. But you’re getting maybe 30% signal and 70% pleasantries. Fine for a commute listen, not a deep dive.