Senior Technical Writer — Space & Defense Systems; Remote

Sphinx builds software to solve complex national security problems in Space. Founded by engineers and technologists with deep experience across commercial and defense technology, we were frustrated by the outdated and insecure technology America's service members are forced to rely on. We're here to do better.

We’re focused on building modern, scalable products with an emphasis on using open source technologies. Expect talented, motivated, and interesting colleagues who emphasize collaboration, transparency, and individual responsibility.

Sphinx is hiring a Technical Writer to lead the development and management of technical documentation supporting complex software systems and space‑ground programs. This role is critical in shaping how information is structured, communicated, and maintained across the organization, ensuring documentation effectively supports engineering workflows and mission execution.

This Technical Writer role is designed for someone who thrives in a fast‑paced, engineering‑driven environment and enjoys bringing structure and clarity to complex systems. You’re comfortable working with developers, understanding software architectures, and ensuring documentation meets both technical and compliance expectations.

In this role, you’ll partner closely with Engineering, Dev Ops, Product and Program teams to gather technical insights, translate complex concepts, and establish scalable documentation practices that support both development and operational success.

• Lead the development of high‑quality technical documentation for complex software systems and space‑ground architectures.
• Create and maintain system documentation, user guides, API documentation, and operational procedures.
• Translate technical requirements, architecture, and workflows into clear, concise written materials.
• Establish and enforce documentation standards, processes, and style guidelines across programs.
• Ensure documentation aligns with government requirements, compliance frameworks, and contract deliverables.
• Review and edit technical content for clarity, accuracy, and consistency.
• Partner with engineers and program teams to gather and validate technical information.
• Drive documentation best practices across engineering and program contributors.

• 5‑10 years of experience in technical writing, ideally supporting software systems or highly technical programs.
• Experience documenting software systems, APIs, or distributed architectures.
• Understanding of how to align documentation with government or regulated program requirements.
• Skill in translating complex technical concepts into clear, structured documentation for varied audiences.
• Experience using version control and documentation management tools, and ability to maintain documentation throughout the software development lifecycle.
• Highly detail‑oriented with strong editing and proofreading skills.
• Ability to manage multiple documentation efforts and priorities in a fast‑paced environment.
• Strong cross‑functional collaboration and questioning skills.
• Eligibility to obtain and maintain a U.S. TS/SCI security clearance.

This role is remote with approximately 25% travel required to support activities in secure facilities in alignment with program requirements.

The base salary for this role is between $106K and $175K (DOE).

Competitive salary, meaningful equity ownership, profit sharing, employer 401(k) contribution, and 100% employer‑covered medical, dental, and vision insurance for you and your dependents.

At Sphinx Defense, we are devoted to building a team that represents a variety of backgrounds, perspectives, and skills. Sphinx Defense is committed to providing equal employment opportunities to all employees and applicants for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or veteran status.

Active eligibility to obtain and maintain a U.S. TS/SCI security clearance is required for this position.