Spacecraft represent the most pressing unmet need across the entire aerospace industry. As more launch vehicles come online and the cost to orbit decreases, more companies launching payloads to space continue to emerge. For the first time in history, this influx of payload companies combined with reduced launch costs has resulted in a massive increase in need for commercial spacecraft platforms, known as satellite buses. These buses hold the payloads of our customers and are flown on launch vehicles. Apex manufactures these satellite buses at scale using a combination of software, vertical integration, and hardware that is designed for manufacturing. Our spacecraft enable the future of society: ranging from earth observation to communications and more. We’d love for you to join us on our mission of providing humankind access to the galaxy beyond our planet.  ABOUT THE ROLE Apex is seeking a Senior Mission Integration Engineer specializing in Space Vehicle Design to join our expanding team. The Mission Integration team turns our foundational spacecraft platform into the backbone of customer missions. It is an end-to-end role as the primary liaison between our customers and technical teams, developing mission concepts, performing technical analysis, resolving interfaces, and executing space vehicle integration and test. Responsibilities • Define end-to-end mission architecture, including spacecraft, launch vehicle, ground systems, and operations per customer requirements. • Lead technical inputs to proposals for future missions by defining technical approaches, feasibility studies, and cost estimates. • Perform mission analysis, including orbital mechanics, trajectory planning, and spacecraft deployment strategies. • Serve as the primary technical liaison between internal technical teams and customers, communicating technical concepts, requirements, and issues clearly and concisely to both technical and non-technical stakeholders. • Lead technical discussion in customer meetings, design reviews, and project status updates. • Collaborate with multidisciplinary teams, including electrical, mechanical, and software engineers, to ensure system integration and performance. • Develop and maintain customer system-level documentation, including specifications, interface control documents, and system design descriptions. • Generate mission specific technical budgets (power, mass, data, pointing, etc.). • Analyze results of coupled loads analysis (CLA) and thermal analysis, and perform electromagnetic compatibility (EMC) assessments. • Perform system-level failure mode and effects analysis (FMEA) and support reliability engineering efforts. • Develop bus to payload communication architecture implementation and support space vehicle level test execution. • Plan and execute final integrated space vehicle systems testing. • Travel to launch sites for vehicle integration, system checkouts, and launch rehearsals. • Work with mission operations teams to track and maintain spacecraft in its operational orbit. • Lead requirements analysis, verification, and validation activities to ensure compliance with customer needs and industry standards. • Identify and assess technical risks associated with system design, development, and operation. • Work with engineering, business development, and external partners to shape future missions. Requirements • U.S. Person status, as this position needs access to export-controlled data. • Bachelor's degree or higher in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, or a related field. • 8+ years of experience working on complex hardware systems (spacecraft preferred) or technical capture management. • Experience in satellite manufacturing or related industries (aerospace, defense, or high-tech). • Strong understanding of space systems, launch vehicle mechanics, orbital dynamics, and mission operations. • Proficiency in Python, MATLAB, STK, FreeFlyer, GMAT, or other mission analysis tools. • Experience coordinating cross-functional teams and managing timelines in a fast-paced environment. • Strong communication and organizational skills, with the ability to prioritize and adapt to shifting demands. • High attention to detail with a focus on delivering concise and technical review content. Preferred • Previous spacecraft, launch vehicle, or payload engineering experience. • Experience with CubeSat, small satellite, or rideshare mission integration. • Experience working with prime contractors or government entities. • Familiarity with flight software, embedded systems, and space communications protocols (CCSDS, S-band, X-band, etc.). #LI-RC1 WHY JOIN APEX? Apex believes in creating a work environment that you look forward to embracing every day. Our employees love working at Apex, and we want you to love it too. We're a fast-growing startup that has raised more than $500M in funding, and we invest heavily in our people from day one. WHAT WE OFFER FOR FULL-TIME EMPLOYEES: - Shared upside: Receive equity in Apex, letting you benefit from the work you create - Best-in-class healthcare: 100% company-paid medical, dental, and vision for you and your dependents, plus $100k life insurance at no cost - Comprehensive PTO package: Starting at 15 days vacation, growing to 20+ days annually, plus 10 paid holidays - Competitive 401(k) plan: Generous matching - 100% match on first 3%, 50% on next 2% - 8 weeks paid parental leave: Plus childcare reimbursement up to $350/day for work-related travel - Daily catered lunch and unlimited snacks: To keep you fueled throughout the day - Vibrant community: Monthly office socials, pickleball tournaments, run club, and gatherings for you and your family - Your dream desk setup: All the tools you need to be your most productive self - World-class Playa Vista office: With the benefit of in-person collaboration with amazing coworkers and flexibility to integrate work and life - Real impact opportunity: Work alongside experts from aerospace, new space, and other cutting-edge industries to make a lasting difference ADDITIONAL INFORMATION: Compensation ranges are set by role, level, location, and alignment with market data. A candidate's specific level and base pay are determined case by case and may vary with job-related skills, education, experience, technical capabilities, and internal equity. Beyond base salary, full-time hires are also eligible for long-term incentives in the form of stock options, along with medical, dental, and vision coverage and a 401(k) retirement plan. ITAR REQUIREMENTS Apex's work is governed by U.S. export control laws, including the International Traffic in Arms Regulations (ITAR) and the Export Administration Regulations (EAR). To be eligible for this role, applicants must either (1) qualify as a U.S. Person, meaning a U.S. citizen or national, a lawful permanent resident (green card holder), a refugee admitted under 8 U.S.C. § 1157, or an individual granted asylum under 8 U.S.C. § 1158, or (2) be able to obtain the required export authorizations from the U.S. Department of State, the U.S. Department of Commerce, or another applicable U.S. government agency. You can learn more about ITAR here https://www.pmddtc.state.gov/?id=ddtc_kb_article_page&sys_id=24d528fddbfc930044f9ff621f961987. EQUAL OPPORTUNITY EMPLOYER Apex Technology, Inc. is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. Candidates and employees are always evaluated based on merit, qualifications, and performance. We will never discriminate on the basis of race, color, 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.