Defense Proposals Lead

Castelion Corporation; Torrance (CA); On-site; USD 90,000 - 120,000; Full time

Job summary

Castelion is seeking a Proposal Manager to own the end-to-end development and submission of high-quality proposals to Department of War customers. You will shape strategy, structure responses, coordinate across engineering, program management, contracts, finance, and leadership, and ensure timely, compliant submissions.

This hands-on writing and leadership role requires translating complex engineering concepts into clear proposal language while aligning with customer mission, evaluation

Qualifications

• 5+ years of experience developing and writing proposals for Department of Defense and/or Intelligence Community customers.
• Demonstrated experience writing/leading proposals from solicitation release through final submission, including planning, compliance, writing, reviews, production, and delivery.
• Excellent technical writing skills, with the ability to turn complex or incomplete source material into clear, concise, customer-focused content.
• Strong understanding of DoD/IC solicitations, proposal instructions, evaluation criteria, and government acquisition environments.

Responsibilities

• Own proposals from kickoff through submission: Lead the full proposal lifecycle for competitive solicitations, white papers, RFIs, RFPs, OTAs, BAAs, and other DoW opportunities.
• Develop proposal strategy and structure: Translate solicitation requirements, customer context, evaluation criteria, and capture strategy into a clear response architecture.
• Write and shape the message: Draft, rewrite, and edit technical, programmatic, management, schedule, manufacturing, test, and execution content.
• Understand and communicate Castelion technology: Develop sufficient technical fluency in Castelion products, architectures, manufacturing approaches, test programs, and operational concepts to independently produce accurate technical writing.

Skills

Proposal management

Technical writing

Cross-functional coordination

Attention to detail

Communication skills

Job description

Castelion is seeking a Proposal Manager to own the end-to-end development and submission of high-quality proposals to Department of War customers. You will shape strategy, structure responses, coordinate across engineering, program management, contracts, finance, and leadership, and ensure timely, compliant submissions.

This hands-on writing and leadership role requires translating complex engineering concepts into clear proposal language while aligning with customer mission, evaluation