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.

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 Software Engineer Platform Integration to develop embedded and integration-layer software that enables Castelion’s hypersonic weapon systems to interface with a variety of airborne and ground-based launch platforms. This includes implementing Universal Armament Interface (UAI) protocols for tactical aircraft and supporting Fire Control System (FCS) integration for ground-based launchers. You will contribute to the full lifecycle of integration, from protocol implementation and system communication to simulation, testing, and mission deployment. The ideal candidate is a generalist with strong software fundamentals, experience working across embedded and systems layers, and a drive to build real-world, high-performance systems.

We’re looking for a Software Infrastructure Engineer to design and build the software backbone of our internal test, development, and manufacturing systems. In this role, you’ll create intuitive interfaces and powerful backend systems that allow hardware, software, and test teams to move quickly and stay tightly aligned. You’ll develop tools that interface with hardware-in-the-loop (HITL) stands, enable real-time telemetry monitoring, automate test infrastructure, and streamline data access across the company.

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.

Castelion is seeking a detail-oriented and highly motivated Development Test Technician to join our manufacturing team. In this role, you will support the design, setup, execution, and documentation of tests on hypersonic missile components and systems during the development phase. You will work closely with design and manufacturing engineering teams to ensure products meet rigorous performance, reliability, and safety standards.

We are seeking an experienced Environmental, Health, and Safety (EH&S) Engineer to join our team in a fast-paced, high-volume manufacturing environment. The ideal candidate will be responsible for ensuring the safety and environmental compliance of our manufacturing processes while driving continuous improvement in health, safety, and environmental performance. This role requires a strong understanding of process safety management, hazard analysis, regulatory compliance, and best practices for industrial safety in the energetics sector.

Castelion is seeking an expert in composites manufacturing to help define and scale our in-house composites manufacturing processes from raw material to flight parts. This will include scaling our current ceramic matrix composite (CMC) production line and supporting day to day production of all composite vehicle components including nozzles, aeroshells, fins, etc. This role will report directly to Castelion’s Head of Manufacturing and work closely with the engineering leadership team to identify and eliminate roadblocks to achieving long term company goals. As an early hire on the manufacturing team, this role will be highly influential in defining manufacturing and production strategy and culture at Castelion.

Castelion is looking for an expert in the development and maturation of complex mechanical assemblies. This position will be tasked with bringing a mechanical product from conception to full scale production

We’re hiring a Cybersecurity Engineer with experience securing systems in regulated, compliance-heavy environments. If you’re well-versed in frameworks like NIST SP 800-171, CMMC, or ISO 27001, and you know how to turn complex regulatory requirements into practical, enforceable security controls, you’ll feel right at home here.

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.

Castelion is seeking a high-impact leader to serve as Director of Program Development for our long-range missile systems a critical new initiative in our portfolio. In this role, you will drive external alignment with government stakeholders, build early customer confidence, and help secure programmatic buy-in by demonstrating how Castelion can deliver unprecedented capability at scale and at a dramatically lower cost point than traditional primes.

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.

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.

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.

We’re looking to hire a Senior IT Service Desk Engineer who thrives in fast-paced, high-pressure environments and brings strong technical acumen paired with a people-first attitude. This role is ideal for individuals with experience supporting, engineering or aerospace firms, DoD contractors, or high-growth startups. If you’re the kind of person who stays cool when things go down and can turn a stressful IT moment into a positive interaction, we want to meet you.

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.