Careers

Castelion is seeking a detail-oriented and highly motivated Apprentice 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.

The Automation and Controls Engineer will design, build, and commission robust manufacturing systems for production of hypersonic-flight components. Success requires the practical application of engineering principles to design, build, test, and integrate process equipment and technologies within our production line. We are seeking a hands-on problem solver with strong expertise in electro-mechanical system design and automation systems, as well as experience working with machinery and production environments. The key to excelling in this position is the effective application of mechanical, electrical, and control systems expertise to enable our manufacturing processes.

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.

As Construction Project Manager, you will be responsible for planning and executing the build-out of new operational and R&D sites for Castelion. You will work closely with internal stakeholders, contractors, architects, and local authorities to ensure our facilities are delivered on time, within budget, and aligned with our mission needs. This role requires a high level of autonomy, field presence, and the ability to thrive in fast-moving, ambiguous environments.

We’re seeking a Director of Manufacturing to lead our Rio Rancho based manufacturing operations — our modern Arsenal of Democracy — delivering hypersonic capability at scale to deter future conflicts. In this pivotal leadership role, you will build and lead a world‑class manufacturing operation, pushing for innovation and operational excellence that positions us as the nation’s premier hypersonic producer.

We are seeking a multidisciplinary Industrial Engineer / Drafter to lead the design, analysis, and optimization of our workspaces, factory layouts, and site enhancements. This hybrid role combines technical drafting and design with industrial engineering principles to improve operational efficiency, ergonomics, and workflow. The ideal candidate will collaborate with cross-functional teams — including Production, Facilities, and Engineering to create data-driven, scalable, and safe site and workspace solutions.

Castelion is seeking a detail-oriented and highly motivated Lead R&D 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.

Castelion is seeking a principal manufacturing engineer to join our Radar development team. In this role, you will own the end-to-end transition from prototype to full-scale production. You will architect and implement manufacturing processes to achieve aggressive production cost, quality, and delivery targets.

Were looking for a hands-on R&D Technician to support prototype fabrication, assembly, and test of hypersonic systems. You’ll work directly with engineers to translate designs into parts and assemblies – focusing on precision manual machining, TIG/MIG welding, and composite layup and repair – in a fast-paced R&D environment.

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.

A a Senior Manufacturing Engineer – Machining, you will lead the rapid expansion of Castelion’s in-house machining capabilities, enabling our mission to fly early and often. This role is critical to our ability to quickly iterate, test, and deliver hardware. You’ll be responsible for standing up infrastructure, processes, and tools that accelerate prototype part delivery – minimizing the time from design release to parts in hand. Beyond rapid prototyping, you’ll also define best practices for design for manufacturability (DFM) of machined components and contribute to the long-term machining strategy for both prototyping and production environments.

We are seeking a Quality Specialist to support development and implementation of our quality management system (QMS), reporting directly to the Quality Manager. This is a hybrid role that combines hands-on inspection responsibilities with process and systems development. You’ll play a key part in establishing our quality framework to achieve AS9100 certification, assisting engineering in developing inspection methods, and ensuring consistent product quality through effective inspection methods and tools.

Castelion is seeking a Senior Tooling Engineer to join our Tooling team. In this role, you will own the end-to-end development of tooling for our products, from concept until implementation on the production floor. You will architect and implement innovative tooling solutions to achieve aggressive production cost, quality, and delivery targets.

We are seeking an experienced and highly motivated Site Development Lead to oversee the planning, design, and execution of site development projects from concept to completion. This leadership role requires a strategic thinker with strong technical knowledge and a proven ability to manage a team while ensuring the project exceeds company goals, is completed on time, and stays within budget. The Site Development Lead will play a key role in coordinating with internal teams, external partners, and stakeholders to ensure the success of critical development projects.

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.

We are seeking a proactive, detail-oriented Facilities Coordinator to support the day-to-day operations and maintenance of our facilities. This role is essential in ensuring our work environment is safe, functional, and efficient, supporting employee productivity and satisfaction.

About Castelion Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We’re designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts. Facilities Manager We are seeking a highly proactive, hands-on Facilities Manager to own the day-to-day operations, maintenance, and continuous improvement of Castelion’s facilities. This role is critical to enabling safe, reliable, and scalable operations across engineering, manufacturing, and office environments. You will serve as the primary owner of facilities performance – balancing immediate operational needs with longer-term planning as the company rapidly grows. The ideal candidate thrives in fast-paced environments, takes pride in operational excellence, and brings a strong sense of ownership, urgency, and attention to detail. Responsibilities • Own all facilities operations across assigned sites, serving as the primary point of contact for facilities-related needs, issues, and improvements • Manage and prioritize work orders, ensuring timely resolution of maintenance, repair, and operational issues • Oversee building systems including HVAC, electrical, plumbing, lighting, janitorial, security, fire protection, and office/industrial equipment • Source, manage, and hold accountable external vendors and service providers for quality, cost, and schedule • Develop and maintain preventative maintenance plans, service schedules, and facility documentation • Ensure facilities comply with applicable safety, health, environmental, and building regulations • Partner with EHS, operations, and leadership to support safety inspections, audits, and corrective actions • Lead space planning efforts, office and lab moves, furniture layouts, and site expansions • Manage facilities-related purchasing, inventory, and budget tracking • Support emergency preparedness planning and incident response (fire drills, power outages, equipment failures) • Drive continuous improvement in facilities processes, responsiveness, and reliability as the company scales • Support special projects related to new site buildouts, expansions, or production ramp Basic Qualifications • High school diploma or GED required; associate’s or bachelor’s degree preferred • 5+ years of experience in facilities management, building operations, or related roles • Strong working knowledge of building systems (HVAC, electrical, plumbing, life safety) • Experience managing vendors, contracts, and service providers • Proven ability to operate independently with high ownership and accountability • Strong communication, organizational, and problem-solving skills • Ability to support off-hours or weekend work during critical operations or emergencies • Comfortable operating in fast-moving environments with shifting priorities • Bias to action, attention to detail, and commitment to building high-quality, reliable workspaces • Proficiency with Microsoft Office; experience with CMMS or facilities management software preferred Preferred Skills and Experience • Experience supporting engineering, manufacturing, or industrial facilities • Familiarity with safety, environmental, and regulatory compliance in technical or production environments • Experience scaling facilities for a rapidly growing company or startup • Budget ownership or cost-tracking responsibility • Hands-on background with light maintenance, troubleshooting, or facilities projects All employees are granted long-term stock incentives as part of their employment at Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year. Leadership Qualities Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support. High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion’s mission and consistently look for ways to contribute to the company’s technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity. Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity. ITAR Requirements: • To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

We’re seeking a highly analytical, execution-focused FP&A Manager to join our lean, high-impact team. In this role, you will own financial planning and visibility across a rapidly scaling defense hardware company. You’ll lead budgeting, forecasting, and performance management processes that enable fast, confident decisions by our leadership and engineering teams.

The Head of Government Affairs will be responsible for leading Castelion’s engagement with policymakers, regulators, and industry stakeholders across the federal, state, and local levels. This individual will develop and execute strategies to ensure Castelion’s priorities are understood by decision-makers, regulatory hurdles are anticipated and addressed, and the company’s policy environment enables rapid innovation and scaling.

The ISSM’s primary function serves as a principal expert and manager on all matters, technical and otherwise, involving the security of information systems under his/her purview. Primary support will be working within Special Access Programs (SAPs) supporting Department of Defense (DoD) agencies, such as HQ Air Force, NAVY, Army, DARPA, etc. The position will provide “day-to-day” support, oversight, and maintenance for Collateral, Sensitive Compartmented Information (SCI) and Special Access Program (SAP) activities.

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.

As an Operations Engineer, you will be the heartbeat of schedule execution for Castelion’s hypersonic weapons development. You will architect and maintain integrated master schedules that span concept design, engineering development, hardware production, flight test, and operational deployment. Working across engineering, manufacturing, and government-program stakeholders, you will keep aggressive timelines on track and ensure that every milestone is grounded in technical reality.

As a Program Master Scheduler, you will be the heartbeat of schedule execution for Castelion’s hypersonic weapons development. You will architect and maintain integrated master schedules that span concept design, engineering development, hardware production, flight test, and operational deployment. Working across engineering, manufacturing, and government-program stakeholders, you will keep aggressive timelines on track and ensure that every milestone is grounded in technical reality.

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.

We are seeking a highly skilled and security-focused Senior IT Systems Administrator to join our team. In this role, you will be expected to be a leader in the design, implementation, maintenance, and security of critical IT infrastructure in compliance with DoD and industry standards. We want to give you the autonomy you need to shine and show what you’ve got! Ideally, youll thrive as someone who is able to handle senior level systems projects end-to-end with minimal oversight, while still delivering high quality work!

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.

As a Strike Weapon Program Manager, you will lead the execution of advanced hypersonic weapon programs from initial concept through delivery, serving as the primary interface with U.S. Government customers and internal engineering teams. You will own program schedules, contractual commitments, and mission success, driving efforts from proposal through design, integration, flight test, and fielding.

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.

As a Weapons Integration Engineer you will be part of the team that ensures Castelion weapon systems integrate seamlessly with ground launchers, tactical/multi-role aircraft, and future systems. You will own platform integration efforts from early concept and capability studies through prototype development, test, and operational deployment – collaborating with propulsion, avionics, GNC, software, flight test, and manufacturing teams to deliver mission-ready solutions.

We’re seeking a Director of Manufacturing to lead our Los Angeles based manufacturing operations — our modern Arsenal of Democracy — delivering hypersonic capability at scale to deter future conflicts. In this pivotal leadership role, you will build and lead a world‑class manufacturing operation, pushing for innovation and operational excellence that positions us as the nation’s premier hypersonic producer.

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 the Software Engineering Manager for Flight Software, you will lead and contribute to the development of flight software for Castelion’s advanced missile systems. This is a hands-on technical leadership role, you’ll architect, review, and write production-quality code while building the team, software infrastructure, and processes needed to deliver certifiable, flight-ready systems. You’ll guide the roadmap from prototype to certified production software, ensuring safety, reliability, and client confidence. Early on, you’ll be deeply involved in software architecture, code reviews and integration; as the program scales, you’ll grow and mentor a team around those foundations.

As the Head of Flight Software Engineering, you will lead the development of innovative flight software for Castelion’s advanced missile systems, playing a critical role in achieving our mission of peace through deterrence. This role demands a highly motivated individual with deep expertise in flight software development, a passion for mentoring teams, and a commitment to deliver robust, mission-critical systems. You will oversee all aspects of flight software design, development, integration, and testing, ensuring that Castelion’s cutting-edge systems perform reliably under the most demanding conditions.

Interested in Castelion but not sure which job to apply for? Drop your resume here and we can help you figure it out.

As the Lead Avionics Engineer specializing in Flight Termination Systems (FTS), you will be responsible for the design, development, testing, and qualification of systems that ensure the safe termination of a flight if it deviates from its planned trajectory. You will work with both hardware and software components, as well as coordinating with various key stakeholders.

Were seeking a Lead Manufacturing Engineer to own the end-to-end manufacturing process for avionics hardware from initial prototype builds, establishing production processes and tooling, to scaling up and sustaining rate production. In this pivotal leadership role, you will build and lead a world class manufacturing engineering team, pushing for innovation and operational excellence that positions us as the nations premier hypersonics producer.

Castelion is seeking a Lead Manufacturing Engineer to own all aspects of solid rocket motor production. In this role, you will lead a cross-functional team responsible for the safe, repeatable, and rate-capable manufacture of solid propellant motors, from propellant mixing through final acceptance. You will drive aggressive cost, quality, schedule, and safety targets in an energetics manufacturing environment while scaling production for mission-critical programs.

Castelion is seeking a Manufacturing Engineer to own the complete case lining, insulation, and protective coating value stream for our solid rocket motor programs. This hands-on individual contributor role will develop, qualify, and scale repeatable, rate-capable processes for internal insulation application, liner dispensing, case bonding verification, and external thermal-protection and paint systems.

Castelion is building the next generation of defense hardware and is looking for a motivated early-career Manufacturing Engineer to join our solid rocket motor production team. In this hands-on role, you will support the development, qualification, and daily execution of safe and repeatable propellant mixing, vacuum casting, and curing.

Castelion is growing our Engineering team to support the development of high-performance materials for hypersonic flight. The ideal candidate will have a comprehensive understanding of materials engineering, with a focus on data-driven process development and optimization. In this role you will have the opportunity to work on a wide range of complex and technically challenging tasks including process development for high-temperature composite materials, and characterization and analysis for different material systems in relevant operational environments. This scope includes support to the manufacturing process development for production of high-performance TPS materials and executing material test campaigns to validate new materials and process changes. This role requires strong problem-solving skills and the ability to collaborate effectively across the materials, manufacturing, and vehicle engineering teams.

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 Principal Hardware Test Engineer to lead the planning, execution, and analysis of hardware test campaigns across Castelion’s missile and vehicle systems. You will own test strategy and execution for major hardware programs, ensuring that system performance is verified through rigorous and repeatable test processes. This role is highly hands-on and collaborative, working closely with propulsion, GNC, electrical, and mechanical engineering teams to translate design intent into validated performance in the field.

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 seeking a Senior Avionics Harness Design Engineer to lead the design, development, and integration of electrical harnessing across our missile and vehicle systems. This engineer will play a critical role in ensuring robust, manufacturable, and high-reliability electrical connectivity throughout the system. You will partner closely with avionics, power, structures, and propulsion teams to deliver mission-critical hardware in a fast-paced, hardware-rich environment. You will additionally support avionics and harness integration at the system and vehicle levels.

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.

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.

The Senior Build Reliability Engineer will lead initiatives aimed at continuous improvement in the reliability and quality of our products. You will develop and implement internal processes and manufacturing software to optimize development and production workflows and ensure high-quality output. You will guide teams in conducting reliability assessments, implementing preventative measures, and addressing quality issues through root cause analyses and corrective actions, all while ensuring compliance with industry standards and regulatory requirements.

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 a Senior Flight Software Engineer, you will play a key role in designing, developing, and testing flight software that powers these advanced systems. You’ll work closely with multidisciplinary teams to deliver high-performance, real-time embedded software that operates reliably under extreme conditions.

We are seeking a Senior Hardware Design Engineer to lead the design, development, and delivery of smart circuit boards that form the brain of our missile systems. You’ll be responsible for everything from initial architecture through layout, manufacturing, test, and integration. You’ll work closely with electrical, firmware, and mechanical engineers to deliver tightly integrated, high-reliability systems. This role is ideal for someone who has designed and delivered complex smart PCBs – with embedded microcontrollers, high-speed interfaces, and networking components – ideally in constrained or mission-critical environments.

Castelion is seeking a Senior Manufacturing Engineer to own the propellant mixing and casting value stream for our solid rocket motor programs. In this hands-on technical leadership role, you will develop, qualify, and scale safe, repeatable, and rate-capable processes for the formulation, mixing, vacuum casting, and curing of energetic materials. You will drive aggressive improvements in yield, cycle time, cost per pound, and safety while supporting a rapidly growing production rate for mission-critical defense systems.

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.

We are seeking a Senior Navigation and State Estimation Engineer to lead the development of advanced navigation solutions for next-generation hypersonic missile systems on the GNC team. In this senior GNC role, you will serve as a technical authority on inertial navigation, guiding architectural decisions and ensuring robust performance in extreme, high-dynamic environments. You will shape system-level strategy, and drive algorithm maturity from concept through to production.

Castelion is seeking a Senior NDE Engineer to own all non-destructive evaluation activities for our solid rocket motor programs. In this role, you will develop, qualify, and deploy advanced inspection techniques capable of detecting critical flaws in large energetic articles while supporting aggressive production rates. You will serve as the technical authority on radiographic, ultrasonic, and emerging NDE methods in a high-hazard, ITAR-regulated environment.

The Senior Propulsion Engineer’s primary responsibility is the design of solid rocket motor primary and secondary structures, along with propulsion components, with an emphasis on schedule, affordability and scale.

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.

We’re looking for a GNC Simulation Software Engineer to design, develop, and maintain high-fidelity simulation software supporting missile guidance, navigation, and control (GNC) development. In this role, you’ll work closely with GNC algorithm developers, flight software engineers, and test teams to create fast, accurate, and robust simulations that drive system architecture decisions, performance assessments, and mission success.

We are seeking a hands-on Senior Software Automation Engineer to be at the forefront of architecting and developing software that drives our radar manufacturing and test infrastructure. In this role, you will design and implement Python-based applications that control RF test equipment, environmental chambers, and data acquisition systems, while ensuring all captured data is stored, organized, and accessible within a PostgreSQL backend.

Were looking for a hands-on software architect who can design and build Castelion’s mission data infrastructure from the ground up. Our hardware generates terabytes of telemetry and test data across manufacturing, lab, and flight environments. You will be the first engineer to architect this company-wide system, from ingestion through visualization, ensuring our hardware teams, technicians, and analysts can get the right data at the right time. This role is not about wiring together existing cloud tools, its about inventing the architecture, designing core services, and implementing the systems that will define how Castelion handles data for years to come.

Castelion is seeking a high performing Teamcenter PLM Developer to lead the architecture, implementation, and maintenance of PLM across engineering, manufacturing and supply chain. In this role, you will be responsible for supporting, configuring, and enhancing Teamcenter (Siemens PLM) and other manufacturing software applications, ensuring seamless integration across multiple engineering and manufacturing systems. The ideal candidate will have strong experience in Teamcenter administration, customization, and integration, as well as a deep understanding of manufacturing processes and software tools.

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.

Castelion is seeking motivated and talented engineering interns for Spring 2026. This internship offers a dynamic, hands-on experience working on cutting-edge missile systems, including SW, guidance, navigation and control (GNC), propulsion, power electronics, manufacturing, mechanical/structures, avionics, system integration, etc. You will contribute directly to the development, testing, and integration of advanced defense systems, while working in a highly collaborative startup environment.

We are seeking an experienced materials & process engineer to join our team as the recognized authority for all metallic materials. This person will be driving material and associated process selection for flight hardware, leading supplier qualification efforts, and defining inspection protocols to ensure performance, reliability, and manufacturability goals are met. The successful candidate will have a strong foundation in metallurgy, materials characterization, failure analysis, and corrosion science, combined with a comprehensive knowledge of metal manufacturing processes. They should also have demonstrated experience taking a metallic material system from early-stage development through full qualification and certification for flight hardware.

Castelion is seeking motivated and talented engineering interns for Summer 2026. This internship offers a dynamic, hands-on experience working on cutting-edge missile systems, including SW, guidance, navigation and control (GNC), propulsion, power electronics, manufacturing, mechanical/structures, avionics, system integration, etc. You will contribute directly to the development, testing, and integration of advanced defense systems, while working in a highly collaborative startup environment.

As a Senior Integration & Test Engineer at Castelion, you will lead the transition of advanced defense hardware from prototype into full production — driving integration, test, and qualification of mechanical and electrical subsystems. In this role you’ll help establish scalable manufacturing and test processes, support flight test campaigns, troubleshoot and resolve integration or test issues, and enable repeatable, production-ready builds of complex, mission-critical systems.