Careers

Castelion is seeking an Aero/Thermal Engineer to lead the analysis, design, and optimization of aerodynamic and thermal systems for our hypersonic missile platforms. This role requires expertise in aerodynamics, thermal modeling, and materials to ensure performance and reliability in extreme environments. The ideal candidate will have a hands-on approach and a passion for tackling complex challenges in high-speed flight regimes.

Join Castelion and play a pivotal role in advancing the development of next-generation hypersonic missile systems. As an Avionics Systems Engineer, you’ll be part of a cross-disciplinary team responsible for the seamless integration of avionics systems across design, development, testing, and operations. You’ll directly impact mission-critical systems that shape national defense and peace through deterrence.

Castelion is seeking a DevOps Engineer to design, implement, and maintain automated infrastructure, CI/CD pipelines, and cloud-based deployments. The ideal candidate has a strong background in Linux administration, scripting, containerization, and infrastructure automation, along with experience managing Azure cloud services and improving system reliability.

As an Embedded Software Engineer you will be at the forefront of creating, developing, and testing the software that drives and simulates our flight systems. Your role involves close collaboration with fellow Castelion engineers across software and hardware domains to implement and debug software across the entire technology stackfrom applications and operating systems to networking, firmware, and simulationensuring complete mission success. We seek intelligent, collaborative, and driven engineers who are passionate about problem-solving and eager to contribute to an extraordinary mission. If you thrive in challenging environments and are excited by the prospect of making a tangible impact, we want to hear from you.

As a GNC Engineer at Castelion, you will be at the forefront of developing and refining the control systems that guide and control our advanced missile systems. You will be responsible for controlled flight of development vehicles, focusing on aerodynamically efficient flight paths. This position offers the opportunity to work on cutting-edge technology, creating advanced flight control algorithms while validating simulation models through real-world testing. You will collaborate closely with cross-functional engineering teams to deliver accurate flight predictions, drive hardware specification, and conduct successful flight tests.

Castelion is seeking a hands-on, high-agency Mechanical Engineer excited to take ownership of real flight hardware and grow alongside a fast-moving team. You will work on the design, fabrication, and integration of critical flight structures and mechanisms across Castelion’s hypersonic vehicles. This role is ideal for someone who thrives in fast-paced environments, learns quickly, and wants to see their work go from concept to flight in weeks-not years. You’ll be empowered to take on meaningful responsibilities immediately. This is a rare opportunity to grow as a full-stack engineer while working on hardware that matters.

We are seeking a highly organized, technically proficient Mission Integration Engineer to lead the coordination of hypersonic flight test campaigns at government test ranges. In this role, you will serve as the primary point of contact between our engineering teams and government test range personnel, driving the end-to-end planning and execution of complex flight test operations.

As a Senior Avionics Hardware Engineer, you will play a vital role in designing, testing, and optimizing hardware systems for cutting-edge hypersonic missile avionics projects. You will contribute to the development and production of high-quality, reliable hardware components for hypersonic missiles. This role provides a hands-on opportunity to work alongside experienced engineers, gain practical experience, grow your technical skills in a fast-paced and innovative environment, and experience a rapid cadence of test flights where your hardware will be tested in the field.

We are looking for a Senior Avionics Test Engineer to own the validation and performance characterization of our control actuation systems the critical interface between control commands and physical motion on our flight vehicles. You will lead the development of rigorous test infrastructure, design and execute test campaigns, and help define the performance envelope of every actuator that flies.

Castelion is seeking a high output Senior Mechanical Design Engineer with a full stack, Responsible Engineer mindset and experience shipping flight hardware. This person will be responsible for critical flight structures and mechanism design and build efforts for Castelions hypersonic vehicles. The Senior Mechanical Engineer will work closely with a fast-moving team of peers and engineering leadership to ensure mission-critical hardware is delivered on time and meets demanding technical performance. A successful candidate will have significant experience delivering high-performance, mass-constrained hardware in a rapid development environment.

Castelion is seeking a high output RF Engineer to lead the design and development of RF communications hardware & telemetry systems (both front end and back end) for Castelion hypersonic test platforms and weapon systems. In this role you will be responsible for initial vehicle telemetry systems for Castelion hypersonic test flights and lead software defined radio (SDR) product development for Castelion weapon systems. The role will coordinate closely with Castelions engineering leadership and report directly to the Head of Avionics. A successful candidate will have significant experience delivering highly manufacturable RF/avionics hardware with extreme reliability for mission-critical applications in a fast-paced environment.

Castelion is designing and building next-generation hypersonic weapon systems that restore stability through credible deterrence. We are seeking a hands-on, mission-driven Ordnance Engineer to lead the design, development, and integration of ordnance systems across our hypersonic vehicles.

Castelion is seeking a Structural Analysis Engineer to use analytical methods, finite element models/simulations, and other analysis tools to produce models, perform analysis, calculations, data reduction, and correlate test results for structures. This role would be responsible for closely collaborating with the design and manufacturing teams to produce designs that meet performance, manufacturability, and schedule requirements.

Castelion is looking for an Avionics Manufacturing Specialist, reporting to the Head of Avionics, to support the development of the systems that will be required for the design and build of long-range hypersonic strike vehicles. This will be a full-time, exempt position located in our El Segundo facility. As an Avionics Manufacturing Specialist, you will work closely with our engineering teams to execute highly technical electrical builds for our research vehicles, assist in advancing designs, and play a critical role in defining and maturing manufacturing, assembly and integration processes.

Were hiring a Director of Communications to lead Castelions storytelling and external communications efforts. This role is responsible for crafting and amplifying our public voice across leading media outlets and key external stakeholders.

As Executive Assistant to the CEO, you will serve as a trusted partner in keeping the CEO organized, prepared, and focused. You will work closely with leadership across the company, helping ensure priorities are advanced efficiently and communication flows seamlessly. This role is 100% onsite in our Torrance headquarters, embedded in the action alongside engineering and executive teams

As a Graphic Designer & Marketing Specialist, you will own creative projects that advance Castelions marketing objectives. As a member of a small team, you will work closely with the marketing manager to produce high-quality branded content, both visual and physical.

We are looking for a resourceful, hands-on HR Manager to serve as the foundational people leader at Castelion. This is a high-impact role for someone excited to wear multiple hatssupporting hiring, onboarding, compliance, employee relations, culture building, and HR infrastructure. Youll work closely with leadership to ensure our people practices keep pace with our growth and reflect our values of excellence, urgency, and trust. This role is 100% onsite in our Torrance headquarters, embedded in the action alongside engineering and executive teams.

Castelion Corporation is currently looking for an Industrial Security Specialist/FSO for our Allen, TX office. The Security Specialist will provide support to the Security department by performing FSO duties for the Allen, TX site and security administrative day-to-day functions. The ideal candidate will work effectively in a fast‐paced, team‐oriented environment with a high level of attention to detail, effective organizational skills, and the ability to adapt to constantly changing demands, excellent customer service skills, and demonstrate capability to take on new and unfamiliar tasks.

We’re growing rapidly and were looking for a high-energy, detail-obsessed Junior Sourcer / Recruiting Coordinator to help us scale our exceptional team. If you thrive in fast-paced, hardware-rich environments and have an eye for technical talent, we want to meet you.

As the manager of supply chain planning, you will be integral in working with the cross-functional groups defining, designing, building, and testing Castelion vehicle and missile subsystems. This role requires an established supply chain professional with breadth to engage with engineering to execute the necessary program sourcing strategies to align with short term development schedules and long term sourcing focus for low cost, sustainable supply chain plans. We seek intelligent, collaborative, and driven leaders who are passionate about problem-solving and eager to lay the groundwork for a team to contribute to an extraordinary mission. If you thrive in challenging environments and are excited by the prospect of making a tangible impact, we want to hear from you.

As a Mission Integration Engineer, you will be the primary technical liaison between Castelion and our government customers, supporting the integration of advanced weapons systems into operational environments. You will drive the entire lifecycle of weapons programs, from early capability studies through prototype development, test, and operational deployment.

We’re seeking a highly analytical, detail-oriented Senior FP&A Analyst to join our lean, high-impact team. In this role, you will help drive financial visibility and decision-making across a rapidly scaling defense hardware company. You will support planning, forecasting, and performance analysis to enable fast, confident decisions by our leadership and engineering teams.

As a Sourcing Specialist, you will be integral in working with the cross-functional groups defining, designing, building, and testing Castelion vehicle and missile subsystems. This role requires an established supply chain professional with breadth to engage new suppliers and program sourcing strategies to align with short term development schedules and long term sourcing focus for low cost, sustainable supply chain plans. We seek intelligent, collaborative, and driven leaders who are passionate about problem-solving and eager to lay the groundwork for a team to contribute to an extraordinary mission. If you thrive in challenging environments and are excited by the prospect of making a tangible impact, we want to hear from you.

Were looking for a Special Projects Leada sharp, execution-oriented generalist who lives at the intersection of strategy, operations, and product. This role reports directly to company leadership and is a unique opportunity to help shape and scale Castelion’s long-term vision from the ground up.

As a Technical Recruiter at Castelion, you will be a strategic partner to our hiring managers, driving the end-to-end recruitment process for technical roles. You’ll play a key role in identifying, engaging, and closing top-tier engineering and operations talent that aligns with our mission.