About the role
We are looking for a Senior Power Electronics Engineer with 3+ years of experience to design and own power systems and power electronics boards for hypersonic flight vehicles. You'll join a small, elite avionics team where engineers personally make hardware work — not just manage requirements or provide oversight. This is a high-impact role where you'll own meaningful subsystems on the vehicle, from initial design through bring-up, debug, validation, and integration into production. Defense experience is not required — we value hands-on circuit design talent from aerospace, automotive, robotics, or any hardware-rich environment.
What will you be doing?
- Designing power electronics PCBAs including motor controllers, DC-DC converters, inverters, power switches, and power distribution systems for current and future flight vehicles
- Owning the full lifecycle of your hardware — from schematic design through bring-up, debug, validation, and production integration
- Defining your own requirements and figuring out the overall power system story in a system context (no separate systems engineers — you own it end-to-end)
- Working on high voltage and high current power systems for actuators, power filtering, and power bus sizing for mission-critical avionics
- Potentially supporting ground systems power electronics alongside flight hardware development
About Castelion
Castelion is a modern defense production company building long-range hypersonic strike systems to address a critical national security gap. Founded in 2021, Castelion was created in response to the recognized need for the United States to rapidly develop hypersonic capabilities to remain competitive with near-peer adversaries and deter future conflicts.
The company operates under the philosophy of "Peace through Deterrence" — building the weapons systems that ensure conflicts never need to happen. Castelion is one of the few companies in the hypersonics space that has moved beyond concepts to actual production deliverables, with government contracts across multiple branches of the military and a $23M+ Navy order for 50 units in calendar year 2027.
Backed by over $469M in funding from top-tier investors including Andreessen Horowitz, Lightspeed Venture Partners, and General Catalyst, Castelion is scaling rapidly. The company is building what it anticipates will become the preeminent hypersonics campus in the country — including a $150M, 1,000-acre solid rocket motor manufacturing facility in Rio Rancho, New Mexico, alongside its headquarters in Torrance, California.
Castelion's culture is defined by technical excellence, ownership, and velocity. Engineers own meaningful subsystems on the vehicle and are responsible for driving their success. The company follows a responsible engineering model inspired by SpaceX, where individuals choose the highest-value work and are empowered to cultivate resources and partnerships to deliver results. The engineering bar is exceptionally high — attracting elite talent who want to be surrounded by other elite talent.
Required skills
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Job details
Salary
$150,000 - $200,000
Location
Torrance, United States
Experience
3+ years
Company
Funding
Total raised
$464M
Last stage
Growth
Investors
Founders
What happens next.
No applications, no recruiter spam. Just the intro.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.