Data Scientist Senior

Apex Systems, LLC; McLean (VA); On-site; USD 186,252,000 - 214,906,000; Full time

Job summary

Everforth Apex, a senior data scientist role in McLean, VA, focuses on applying Python and GenAI to build, test, and operationalize AI solutions that align with business goals. The role involves prompt design, validation, data preparation, and collaboration with cross-functional teams.

The ideal candidate brings 5–7+ years of experience, strong Python skills, and hands-on LLM experience, with familiarity in OpenAI/Anthropic APIs and vector databases.

Qualifications

• Bachelor's degree or higher preferred; exceptional experience may compensate.
• 5-7+ years of relevant experience in data science or AI.
• Experience with end-to-end AI solution development.
• Experience with OpenAI or Anthropic APIs.
• Applied AI engineering background is a plus.

Responsibilities

• Develop AI-powered applications using Python and LLMs.
• Design, test, and refine prompts; validate outputs.
• Build quality controls and guardrails for accuracy.
• Collaborate with technical teams to deploy solutions.
• Work with business teams to translate problems into AI use cases.
• Extract, clean, and structure data from diverse sources for GenAI.

Skills

Python development

Prompt engineering

LLM experience

Analytical skills

Independent work

Bitbucket version control

Education

Bachelor's degree or higher

Tools

OpenAI API

Anthropic API

RAG

Vector databases

Job description

# Data Scientist SeniorApply**Job#: 3054676****Job Description:**Data Scientist Senior**Location:** McLean, Virginia (Onsite)Role OverviewWe are seeking a highly analytical and execution-focused Senior Data Scientist to support an AI Execution function. This role focuses on leveraging Python and Generative AI technologies to build, test, validate, and enhance AI solutions that support business objectives. This position emphasizes problem understanding, rapid experimentation, data operationalization, and applied AI to turn raw data and emerging AI capabilities into practical, reusable solutions.Key Responsibilities* Develop and implement AI-powered applications using Python and LLM technologies.* Design, test, and refine prompts while validating AI-generated outputs.* Build quality controls and guardrails to improve accuracy and reliability.* Collaborate with technical teams to integrate and deploy solutions.* Partner with business teams to understand complex problem statements and translate them into AI-enabled solutions.* Extract, clean, and structure data from raw and heterogeneous sources to enable analytics and GenAI use cases.* Contribute reusable code, patterns, and documentation to shared repositories.Required Qualifications**Education:** A Bachelor's degree or higher is preferred. Candidates with less education should demonstrate exceptional relevant experience.**Experience:** 5-7+ years of relevant experience.**Technical Skills:*** Strong Python development skills.* Hands-on Prompt Engineering and Large Language Model (LLM) experience.* Strong analytical and problem-solving abilities.* Ability to work independently with minimal direction.* Experience with Bitbucket and version control.Preferred Qualifications* End-to-end AI solution development experience.* Experience with OpenAI or Anthropic APIs.* Experience with RAG and vector databases.* Financial Services or Mortgage domain knowledge.* An Applied AI Engineering background. *Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.**Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy**Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.**Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.**If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [e-mail] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.**UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.***Employee Type:** Contract**Location:** Mclean, VA, US**Job Type:****Date Posted:** October 5, 2026**Pay Range:** $65 - $75 per hour