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Castelion Tech Stack

Hypersonic weapons manufacturing at scale

Defense and Space Manufacturing Torrance, CA 51–200 employees Founded 2022 Privately Held

Castelion is building production infrastructure for hypersonic strike systems. The stack reflects a hardware-forward engineering org: CAD tools (PTC Creo, CATIA), embedded systems (C++, Rust, ARM, FreeRTOS, Zephyr), ML compute (PyTorch, TensorFlow, CUDA), and CI/CD (Jenkins, GitHub Actions, Kubernetes). The hiring mix is heavily weighted toward manufacturing (34 roles) and engineering (51 roles), with leadership gaps in government affairs and compliance—a pattern consistent with a 2022-founded startup transitioning from prototype to production while navigating defense sector regulatory requirements.

Tech Stack 101 technologies

Core StackJenkins GitHub Actions Docker Kubernetes Grafana Python GitHub CATIA C++ Rust PyTorch TensorFlow LinkedIn Azure Git Foxglove Nexus Conan Cargo Bash NX PTC Creo Excel C CUDA Zephyr FreeRTOS ARM JTAG RISC-V+71 more

What Castelion Is Building

◆Challenges

Transitioning prototype to production
Aggressive production cost targets
Scaling manufacturing processes
Improving system reliability
Regulatory compliance across manufacturing
Reducing manufacturing cost
Scaling production from prototype to high volume
Audit readiness
Streamline approvals
Production roadblocks elimination

▲Active Projects

Designing production tooling and equipment
Prototype to production transition
Production ramp
Hypersonic production campus
Develop a government affairs team
Build bipartisan relationships
Implementing new manufacturing capabilities
Design and build test equipment
Production build support
Implement advanced process monitoring

Hiring Activity

Steady110 roles · 45 in 30d

Department

Engineering

51

Manufacturing

34

Ops

10

Security

4

Support

2

Design

1

Finance

1

Government

1

Seniority

Senior

44

Mid

38

Manager

8

Director

5

Lead

5

Intern

3

Staff

2

Junior

1

Notable leadership hires: Manufacturing Director

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About Castelion

Castelion manufactures hypersonic weapons systems for U.S. government defense programs. Founded in 2022 and based in Torrance, California, the company operates across three core areas: design and prototyping (using PTC Creo and CATIA), embedded firmware development (C++, Rust, ARM-based systems), and production scaling. Active projects span prototype-to-production transition, new manufacturing capability implementation, test equipment design, and the setup of a dedicated hypersonic production campus. The organization is actively recruiting across engineering, manufacturing operations, and security to support high-volume production ramp and government relationships.

HeadquartersTorrance, CA

Company Size51–200 employees

Founded2022

Hiring MarketsUnited States

Frequently Asked Questions

What tech stack does Castelion use?

Design: PTC Creo, CATIA. Firmware: C++, Rust, ARM, FreeRTOS, Zephyr. Compute: PyTorch, TensorFlow, CUDA. CI/CD: Jenkins, GitHub Actions, Kubernetes. Collaboration: GitHub, Git, Bash, Python.

What is Castelion working on?

Prototype-to-production transition for hypersonic systems. Active projects: production ramp, hypersonic production campus build, new manufacturing capabilities, test equipment design, and government affairs team formation.