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Data Scientist (Senior)

SOSi sosi.com Open
On-site Chantilly Full-time Senior Data Science

At a glance

Senior Data Science role at SOSi. Chantilly · full-time · no salary stated · we estimate $148,247–$205,000 across the United States.

Estimated pay

SOSi has not published a salary for this role. The figure below is our estimate, not theirs.

$148,247 – $205,000
What the middle half of senior data science roles in the United States paid, among postings that did state a salary.
Worked out from 546 postings that stated pay, median $175,425. Last updated Nov 6, 2026.
RoleData Science
SenioritySenior
LocationChantilly
WorkplaceOn-site
EmploymentFull-time
PostedOct 5, 2026
Role brief

dataroles summary, based on the employer's posting.

What you'll do

  • Advise on advanced statistical techniques, machine-learning algorithm choices and organization-wide data strategy
  • Prepare and tune large data sets by cleaning, processing and managing them for performance
  • Develop AI and machine-learning models and weights for object detection, data triage, search, inference and automated decisions
  • Apply time-series forecasting, statistical modeling or geospatial analysis to customer problems

What you bring

  • At least seven years of relevant professional experience
  • An active TS/SCI clearance with Polygraph
  • Working knowledge of PostgreSQL/SQL, Python or R, plus the other listed tools and languages
  • Experience with large-scale data processing, machine learning and distributed computing such as Hadoop or Spark

Who this fits

This senior onsite role is based in Chantilly and supports a government customer. The position depends on the contract being awarded.

From the employer

Founded in 1989 and headquartered in Reston, Virginia, SOSi is a private defense and government solutions business specializing in advanced technology systems and mission support. Its capabilities include data science, software development, network engineering, intelligence, surveillance, and reconnaissance (ISR), and logistics.

*Position is contingent upon contract award*

SOSi is seeking a Data Scientist to support our government customer in Chantilly, VA.

Essential Job Duties

  • serves as a key technical resource for advanced statistical methods, ML algorithm selection, and enterprise data strategy.
  • Active in scope TS/SCI w/ Poly.
  • Minimum 7+ years of relevant experience.
  • Proficiency with major data science tools and languages such as PostgreSQL/SQL, Python, R, NiFi, and Git.
  • Experience with cleaning, managing, optimizing performance with, and processing large volumes of data.
  • Familiarity with industry best practices for software/hardware optimization when processing large data sets.
  • Experience with machine learning, statistical modeling, time-series forecasting, and/or geospatial analytics.
  • Experience with Hadoop, Spark, or other parallel storage/computing processes.
  • Experience providing services to develop AI/ML models and weights to facilitate object detection, data triage, search/optimization, inference, and automated discovery and decision making.

Work Environment

  • Normal office conditions.

Working at SOSi

All interested individuals will receive consideration and will not be discriminated against for any reason.

Opportunity

Data Science work from LinkedIn, X, Reddit and Upwork, in one list.

Each morning you get everything that fits, strongest first.

Data Science

Find me work

By the team behind dataroles.

Find me work
Opportunity

Data Science work from LinkedIn, X, Reddit and Upwork, in one list.

Each morning you get everything that fits, strongest first.

Find me work

By the team behind dataroles.