Marathon TS is hiring a Proposal Writer to own the development of proposal content in support of federal IT services pursuits across IT engineering, cybersecurity engineering, AI/ML operations, and cloud platform services. This is a writing-centered role for a strong content developer who can work directly with subject matter experts (SMEs), capture leads, corporate leadership, and the Senior Proposal Manager to transform ideas, technical input, and strategic direction into compliant, compelling, and evaluator-focused proposal narrative.

The ideal candidate is an experienced federal proposal professional who is comfortable taking responsibility for content development from early shaping through final submission readiness. This person will lead content creation for assigned proposal sections and artifacts, mature content through multiple review cycles, and work collaboratively with corporate leadership and the Senior Proposal Manager to refine messaging, strengthen responsiveness, and prepare polished final content for submission.

Key Responsibilities

Own the development of assigned proposal content from early pursuit shaping through final submission readiness, with direct accountability for content quality, clarity, responsiveness, and persuasive strength.
Serve as the primary writer for assigned proposal sections and artifacts, including technical approaches, management approaches, staffing content, transition plans, quality assurance content, executive summaries, past performance narratives, key personnel write-ups, corporate experience sections, and oral presentation materials.
Work directly with SMEs, capture leads, and solution personnel to gather source material, clarify technical concepts, and extract the information needed to build strong proposal narrative.
Partner with corporate leadership and the Senior Proposal Manager to refine messaging, sharpen discriminators, strengthen executive positioning, and improve overall proposal quality.
Contribute throughout the full proposal lifecycle, including pre-RFP planning, content strategy sessions, storyboarding, annotated outlines, draft development, color team recovery, final revisions, and submission preparation.
Support final submission readiness by refining assigned content to near-final quality, addressing review comments, confirming consistency with adjoining sections, and helping prepare content for production.
Maintain and improve the client Proposal Content Library so writers and proposal leaders can rapidly access current, accurate, and reusable content.
Own the development and refresh of past performance write-ups, corporate qualifications narratives, management boilerplate, key personnel summaries, oral presentation content, and other reusable artifacts.
Support development of oral presentations, demonstrations, executive briefings, and related presentation artifacts, including slide content, scripts, speaker notes, mock Q&A material, and presentation flow.

Required Qualifications

Minimum 5 years of experience in federal proposal writing, proposal content development, technical proposal writing, or closely related roles in a government contracting environment.
Demonstrated success owning proposal content development for federal opportunities, including drafting, rewriting, and refining narrative through multiple review cycles.
Strong experience writing one or more of the following: technical approaches, management plans, staffing plans, transition approaches, quality plans, executive summaries, past performance narratives, resumes, oral presentation materials, or corporate experience sections.
Excellent writing, rewriting, and substantive editing skills, with the ability to turn rough technical input and strategic guidance into polished proposal content.
Familiarity with federal solicitation structures, proposal instructions, and evaluator-focused writing, including practical understanding of Sections L and M.

Marathon TS

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