- Company: SO Si
- Location: Reston, Virginia
- Salary: Pay not listed
SO Si at a glance
sosi.comSEC filings mentioning "SOSi": 160 — search EDGAR
Senior Proposal Manager at SOSi in Reston, Virginia
Position Summary
SOSi is seeking a Senior Proposal Manager to join our team. This role requires a security clearance and involves leading complex proposal efforts for government contracts. The ideal candidate will have extensive experience managing high-stakes proposals and working with cross-functional teams.
Day-to-Day Responsibilities
- Lead the development of comprehensive proposals in response to RFPs, RFQs, and other solicitation documents.
- Coordinate with internal stakeholders including technical, program management, legal, and financial teams to ensure proposal accuracy and completeness.
- Develop and maintain project plans for proposal submissions, ensuring timely delivery.
- Conduct market research and analysis to support the development of compelling proposals that align with client needs.
- Ensure compliance with all security clearance requirements and company policies.
What You Bring
- A minimum of 10 years of experience in proposal management, with a focus on government contracts.
- Experience with Level III or higher security clearances.
- Strong leadership skills to manage and motivate cross-functional teams.
- Excellent written and verbal communication skills for crafting persuasive proposals.
- Familiarity with proposal development tools and software.
Working at SOSi
SOSi is a private defense and government solutions business specializing in advanced technology systems and mission support. Our capabilities include data science, software development, network engineering, intelligence, surveillance, and reconnaissance (ISR), and logistics. As part of our team, you will have the opportunity to work on cutting-edge projects that make a difference in national security.
Applying for This Role
To apply, complete your application directly on this page, or you'll be redirected to the employer's application platform to finish submitting there. Please ensure all required fields are filled out and submit your resume and cover letter highlighting relevant experience.
To apply, complete your application directly on this page, or you'll be redirected to the employer's application platform to finish submitting there.You’ll finish your application on the employer’s website. We don’t ask for a resume on this page.
Explore SO Si online
What people say about SO Si
- Ask HN: Is physics moving forward?
- Ask HN: Freelancer? Seeking freelancer? (January 2015)
- After California decriminalized pot, teen arrest, overdose, dropout rates fell
- Ask HN: Freelancer? Seeking freelancer? (March 2014)
Recent news
- Wednesday, July 8th: Marbles, SOSI, Pringles Hot Dogs - CBS 17
- An Easy Escape in SoSi, VA - Blue Ridge Outdoors Magazine
- Visit SoSi launches next round of tourism sponsorship - The Danville Register and Bee
- SOSI adding knee and hip replacement specialist - Steamboat Pilot
- Price to sales forward of Sotkamo Silver AB – NGM:SOSI - TradingView
Aggregated from public discussions and news; opinions are the authors’ own.
Working in Reston, Virginia
Weather right now in Reston, Virginia: checking… · Local time: · Air quality: · Daylight: · UV index: · Wind: · Pollen:
Virginia, officially the Commonwealth of Virginia, is a state in the Southeastern and Mid-Atlantic regions of the United States between the Atlantic Coast and the Appalachian Mountains. It borders Kentucky to the west, Tennessee to the south-west, North Carolina to the south, West Virginia to the north-west, and Maryland to the north. The state's capital is Richmond and its most populous city is V
🇺🇸 Relocation safety for US: Exercise Normal Caution — via Warnely, CC BY 4.0
National unemployment rate in US: 4.2% — via World Bank
Private-sector wage growth (year over year): 3.1% — via FRED
National quits rate: 2.0% — via FRED (BLS JOLTS)
Weekly initial unemployment claims: 197,000 — via FRED
GDP per capita in US: $90,027 — via World Bank
Consumer price inflation in US: 2.9% (annual) — via World Bank
Real GDP growth in US: 2.2% (annual) — via World Bank
Average hours worked per year in US: 1,800 — via OECD
Cost of living in Virginia: 1.1% above the national average — via BEA
Minimum wage in Virginia: $12.77/hr — via FRED
Real GDP per capita in Virginia: $70,264 — via FRED
Home prices in Virginia (year over year): +3.8% — via FRED
Median household income in Fairfax County: $132,774 — via US Census ACS / Data USA
Most common commute in Fairfax County: Drove Alone (53%) — via US Census ACS / Data USA
Households with home internet in Fairfax County: 97% — via US Census ACS / Data USA
Nearby history: Bowman, A. Smith, Distillery, listed 1999 (742m away) — via National Register of Historic Places
Typical climate: average high 64°F / low 48°F year-round (summers around 83°F, winters around 29°F) — via NOAA 1991-2020 Normals
Walkability: Above average walkable — via EPA National Walkability Index
Typical rent nearby: $2,015/mo · $2,246/mo — via HUD Fair Market Rents
- Elevation 114m (374 ft)
Source: Wikipedia (state)
Job details above are provided by the employer/source. The sections on this page are compiled from public data sources with AI assistance.
Accommodations: if you need a workplace accommodation to apply for or perform this job, see ADA.gov or EEOC.gov for guidance on your rights and how to request one.
Listing facts
- Role Senior Proposal Manager
- Employer SO Si
- Location Reston, Virginia
- Type Full Time
- Pay (from listing) Pay not listed
- Posted August 5, 2026
- Apply by September 4, 2026
- Country United States
- Overview Full job description on this page (304 words)
Facts above come from this job record on Get A Job.AI — not copied from third-party review sites.
Public discussions & open sources
Attributed public threads and profiles — not employee reviews or star ratings.
- Hacker News — Ask HN: Is physics moving forward?
- Hacker News — Ask HN: Freelancer? Seeking freelancer? (January 2015)
- Hacker News — After California decriminalized pot, teen arrest, overdose, dropout rates fell
- Hacker News — Ask HN: Freelancer? Seeking freelancer? (March 2014)
Cached public sources (Hacker News, Dev.to, GitHub, etc.).
Employer website
Explore related openings
3 other opening(s) at SO Si on Get A Job.AI
Occupation family: Proposal Manager
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