Philip Johnston is the CEO and Co-founder of Starcloud, a YC-backed startup building data centers in space to solve AI's growing energy crisis. After working at Goldman Sachs and consulting for Middle Eastern space agencies, Philip assembled what he calls "the 10 most kickass engineers in the world" from thousands of candidates. Their mission: create gigabit-scale orbital data centers with 4km solar arrays that could fundamentally transform computing infrastructure.In this episode, Philip reveals his journey from being rejected twice by YC to securing $21M in funding and preparing to launch Starcloud's first satellite this year. He explains why his small, elite team is developing technology to run NVIDIA's H100 chips in space (the first time in human history), their rapid 18-month satellite development cycle, and why conventional terrestrial data centers simply cannot scale to meet future AI energy demands.-----------------------------------------------Chapters:00:00 Introduction02:02 Growing Up with a YC Founder Brother04:28 Why Trading Skills Are Useless for Entrepreneurship12:13 The Starbase "Holy Sh*t" Moment That Started It All16:42 The First Angel Investor Who Changed Everything21:03 Why Redmond (Not LA) Is the Real Space Capital23:47 Y Combinator & The Viral White Paper That Got Them Roasted29:29 Over 200 VCs Reached Out: The $11M Round in Days32:35 Hiring Only 10 People: The World's Most Elite Space Team37:27 First to Fly NVIDIA H100s in Space42:20 Quick Fire Questions: Why Humanity Will Wipe Itself Out47:52 Why Your Crazy Idea Probably Sucks-----------------------------------------------Takeaways:1) Exposure to high achievers eliminates the impossible - "One thing that having an identical twin brother gives you is... it teaches you what is possible. If he can do something, there is no reason I shouldn't be able to do it." 2) Traditional finance experience is worthless for founders - "I would not recommend anybody become a trader if you want to be an entrepreneur... trading is an incredibly niche and non-transferable skill set." 3) Best founder training: startup experience beats everything - "The best path to founding a company is to go work for a startup." Philip's clear hierarchy of valuable pre-founder experience places startups at the top, followed by management consulting, with VC and trading trailing far behind.4) Lead with your most audacious vision, not incremental steps - Philip's biggest fundraising regret was initially pitching short-term vision: satellite edge computing instead of his revolutionary vision for orbital data centers.5) American angels wire money immediately; Europeans wait for others - "American angels are like absolute godsend because they sign and wire on the same day... in Europe they're like, who else is in?" The cultural difference in investor behavior meant Starcloud's first check came from an American who decided independently without needing social proof.6) Move your company to the talent, not where "space companies go" - "Everybody we want to hire lives in Redmond, Washington... for satellites, Redmond's like the global capital." Philip relocated from aerospace hub El Segundo when he discovered 90% of satellites were actually designed and built in Redmond.7) Hire slowly: interview thousands to find your 10 perfect engineers - "We spent an enormous amount of time interviewing and not hiring lots of people... we went through about 10,000 CVs." Starcloud's elite 10-person team resulted from an extraordinarily selective process that rejected thousands of qualified candidates.8) "Build it and see" beats "spend months in CAD" - "We are very much a build it and see culture rather than a spend six months in CAD and see culture." Philip's team prioritizes physical prototyping and testing over extensive theoretical design, accelerating their development cycle dramatically.

Lukas Werling is the CEO and co-founder of ISPTech, a German space startup developing green propellants that eliminate the need for hazmat suits and could slash space propulsion costs by 75%. The company has in a short time secured €2 million in funding with three orbital missions lined up for flight later this year.

In this episode of Rockets and Radars, Lukas shares his journey from a mechanical engineering student rejected from aerospace programs to spending 14 years at DLR (Europe's premier rocket testing facility) before selling his motorbike to raise startup capital. From supervising thousands of rocket engine hot firings to managing Europe's most unique test facility, from watching technicians in hazmat suits handle toxic propellants to developing fuel safe enough to handle with bare hands, Lukas explains how patient research and perfect timing created a company that had paying customers before it even officially launched.

Want to get hired in ISPTech? https://tally.so/r/mOq9b7

Want to invest in ISPTech? https://tally.so/r/nGE4qp

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Chapters:

(00:00) Introduction

(03:09) Getting Rejected

(08:00) Breaking into DLR

(14:34) Finding the Perfect Co-founder

(21:01) The Spin-Out Decision

(30:32) Incorporating with €25K: Selling the Motorbike

(35:56) Getting First Customers Before Incorporation

(44:36) Funding Journey: €2M Pre-Seed

(51:17) Future Vision: Space Infrastructure & Mobility

(54:34) Quick Fire Round: Biggest Mistakes & Key Decisions

(58:52) Advice for Researchers

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Takeaways:

1) Persistence beats rejection - keep asking until someone says yes. "I talked to my professor during his lectures. I went to his office several times... he was always saying, yeah, I will reach out." Lukas got into DLR by repeatedly asking his professor for an introduction until he finally made the call.

2) Technology maturity trumps perfect business plans for deep tech - "We had like years and years of testing at the test bench... many companies didn't have those possibilities." Having proven technology from 14 years of research gave them customer confidence that business plans alone couldn't provide.

3) Know your customers' pain points before you spin out - "We knew some spacecraft manufacturers, some people... what their issues are, what their pain points are." Don't guess at market needs - work directly with your future customers to understand their problems first.

4) Hire people you've worked with for years, not strangers - "The first people we hired were from this... student team... We know them for years." Your early team should be people whose work quality and character you've personally witnessed over time.

5) Speed beats bureaucracy when markets are moving fast - "We can decide, we can make progress as a company much, much faster... people from DLR approaching us, ah guys, can you do it so fast?" Startup agility is your biggest advantage over large institutions.

6) Never start work without a written contract, no matter who asks - "The biggest mistake I made is to start some work... without a written contract... it never materialized." Even trusted contacts can disappear - always get agreements in writing before starting any work.

7) Build your network before you need it - "We had our network. Of course, we knew some spacecraft manufacturers... this was an advantage." Relationships built over years become customers and partners when you're ready to commercialize.

8) Focus on customer contracts, not just grant funding - "We need, just frame contracts... As a company you want customers and not additional grant funding." Paying customers validate your business better than government grants ever will.

9) Plan backwards from your vision to find the first step - "You want to build this huge power plant... plan backwards... solve one issue after the other." Break dreams into manageable technical problems you can solve sequentially.

Sebastian Klaus (CEO and co-founder of ATMOS Space Cargo) went from a 17-year-old watching SpaceShipOne make history to building Europe's fastest-moving space reentry company from prototype to flight under 12 months.

In this episode of Rockets and Radars, Sebastian reveals how ATMOS went from nearly going bankrupt in 2022 to successfully demonstrating inflatable heat shield technology from a small plane over the South Atlantic. From 14 years of military service to convincing investors to put €10M+ into the "most advanced technology in spaceflight history," this is the raw story of Europe's race to build space sovereignty—and how ATMOS could become the "FedEx for space."

Want to get hired in ATMOS? https://tally.so/r/wvalVD

Want to invest in ATMOS? https://tally.so/r/wLjeBp

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Chapters:

(00:00) Introduction

(02:49) From 17-Year-Old Dreamer to Military Officer

(10:23) Building the Dream Team: Finding Co-founders

(19:32) Early Prototyping & Technical Validation

(22:44) The Dark Year: 2022 Crisis & Near Bankruptcy

(29:58) The Funding Gauntlet: Raising €10M+ Seed Round

(38:45) Lori Garver & EIC Grant: €13M European Bet

(44:20) Phoenix One Mission: Historic Flight Success

(49:00) Defence Pivot: Ukraine War & Drone Applications

(54:39) Quick Fire Round & Hiring Philosophy

(58:21) Advice for Young Founders

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Takeaways:

1) Study the fundamental bottlenecks of your future industry before it exists. "I did my bachelor's on atmospheric reentry and my master's on reusable rocket engines. For me it was very clear - you need atmospheric reentry technology and you need to be able to reuse those things."

2) Recruit co-founders when they're at career peaks but facing industry decline. "On Christmas Eve, I called a world-class engineer who had just launched a $10 billion space telescope. I said 'Your rocket program is being shut down. If you want to quit, now is the time.'" Target potential co-founders when their current path has obvious dead ends.

3) Physical prototypes unlock funding that slide decks never will. "We dropped a 1:10 scale prototype from a helicopter to test our inflatable heat shield. It worked on the first try and became a very good marketing tool for customers and investors."

4) Work second jobs to fund your startup - investors notice the sacrifice. "My co-founders and I were all working second jobs to keep the company afloat. We didn't pay ourselves a single euro in salary. Founders sacrificing personal income signals total commitment to investors.

5) Find technologies where physics gives you 10X advantages over incumbents. "With inflatable technology, we can bring back 10X more cargo from space." Look for fundamental physical constraints that new approaches can completely break.

6) Pivot when customers give you contracts, not just compliments. "Once we switched to building our own spacecraft and selling to pharmaceutical companies, we felt real customer pull. Companies immediately gave us letters of intent and MOUs." Polite interest isn't market validation - signed agreements are.

7) Fly to the middle of nowhere for your company's biggest moments. "I flew 700 kilometers over the Atlantic Ocean in a small plane with Starlink duct-taped to the window to watch our spacecraft return from orbit." Critical company moments require founder presence, not remote management.

8) Build operational flexibility into everything, not just your product. "We had to completely replan our space mission weeks before launch when our landing zone changed from the Indian Ocean to the South Atlantic." External changes will break rigid operations - adaptability determines survival.

9) Dual-use technology can 10X your addressable market overnight. "The same technology that returns pharmaceutical experiments from space can deliver drones anywhere on Earth within hours." Defence applications can massively expand your total addressable market.