CareerPlan

Principal Applied Scientist, Mission AI Lab, AWS Region Services

Arlington, Virginia, United StatesFull-time$199k–$269k2026-10-20 → 2026-11-10
Visa sponsorship offeredSecurity clearance required

Core

Create frontier AI models for national security problems, pushing state-of-the-art models to excel at tasks no off-the-shelf model has seen.

Role type

Principal Applied Scientist (Mission AI)

Builds

Production systems for complex reasoning tasks, data pipelines, and evaluation frameworks for national security delivery.

Domain

National Security / AI Infrastructure

Deliverable

production ML models

Required skills

predictive modeling, algorithm design, parameter-efficient fine-tuning, data curation, evaluation metric design, code implementation (Java/C++/Python), mentoring scientists

Preferred skills

frontier AI lab experience, novel algorithm creation, active TS/SCI clearance, defense AI company experience

Technologies

GPU hardware, reinforcement learning, supervised fine-tuning, LoRA-style methods

Responsibilities

Own end-to-end adaptation of frontier models, define evaluation sets and metrics, build data pipelines, judge when new methods are needed, extend models to new domains, run human-in-the-loop feedback loops, document methods, represent lab science in reviews, mentor scientists

Seniority

Principal, hands-on IC with strategy & mentorship