Senior Applied Scientist, Leo Security

About the role

Amazon Leo is a constellation of Low Earth Orbit satellites that will provide low‑latency, high‑speed broadband network connectivity to unserved and underserved communities around the world. We are looking for an Applied Scientist to be a founding scientist on the Engineering and R&D team within Leo Infrastructure and IP Security. The team defends the manufacturing lines, launch sites, and global ground infrastructure behind the constellation from the most sophisticated threat actors on the planet. This role tackles open scientific problems at the intersection of agentic AI, real‑time stream processing, graph‑based reasoning, and behavioral analytics, building the science behind a neurosymbolic reasoning platform and the models that detect sophisticated threat‑actor behavior.

Export Control Requirement

Due to applicable export control laws and regulations, candidates must be a U.S. citizen or national, U.S. permanent resident (i.e., current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum.

Responsibilities

• Design and implement scalable, production‑grade neurosymbolic systems that integrate symbolic reasoning over graph‑based knowledge representations with LLM agents to deliver reliable, verifiable security outcomes.
• Design and run reinforcement learning and fine‑tuning pipelines (GRPO, PPO, DPO) to optimize language models for security reasoning, triage, and detection‑authoring tasks.
• Build behavioral and statistical models that detect threat‑actor behavior, and design evaluation frameworks that measure model performance against that behavior before trusting a model in production.
• Design and build multi‑agent systems that autonomously triage, enrich, and contain security events, including constrained reasoning, safety guardrails, and validation mechanisms that make automated decisions trustworthy at scale.
• Own the end‑to‑end science lifecycle, from research and experimentation through production deployment, defining the metrics that measure system performance and real‑world security impact.
• Advance the state of the art through publications at top‑tier venues, patents, or open‑source contributions, and shape the scientific agenda and research culture from day one.
• Collaborate with security engineers to translate threat intelligence into adversary behaviors, build detection models, and evaluate model performance against those behaviors.
• Backtest candidate detections against retained telemetry, review evaluation results before a model or agent capability graduates to automated execution, and deliver scientific artifacts that ship.

A Day in the Life

You will move between research and production in the same week: framing an ambiguous security problem as a scientific question, prototyping an approach, and partnering with software engineers to ship it as a capability the platform runs continuously. You will obsess over the two latencies that define the platforms—the time from event to detection and the time from detection to containment action—and design agents and detections that drive both down.

About the Team

Leo Infrastructure and IP Security protects the people, facilities, hardware, and supply chain behind a global satellite constellation. The Engineering and R&D team builds the platforms and tooling the security pillar teams operate on, moving security operations from manual triage to correlation‑based detection, automated response, and agentic AI. The team is composed of applied scientists, software engineers, and security engineers working across physical and digital security domains.

Team Culture

In Amazon Security, it’s in our nature to learn and be curious. Ongoing DEI events and learning experiences inspire us to continue learning and to embrace our uniqueness. Addressing the toughest security challenges requires that we seek out and celebrate a diversity of ideas, perspectives, and voices.

Career Growth

We continuously raise our performance bar as we strive to become Earth’s Best Employer. You’ll find endless knowledge‑sharing, training, and other career‑advancing resources to help you develop into a better‑rounded professional.

Work/Life Balance

We value work‑life harmony. Achieving success at work should never come at the expense of sacrifices at home, which is why flexible work hours and arrangements are part of our culture.

Basic Qualifications

• 3+ years of building machine learning models for business application experience.
• PhD, or Master's degree and 6+ years of applied research experience.
• Experience programming in Java, C++, Python or a related language.
• Experience with neural deep‑learning methods and machine learning.
• Experience with graph algorithms, knowledge graphs, unsupervised learning (clustering, dimensionality reduction, anomaly detection), NLP, and embedding‑based retrieval.
• Experience designing evaluation frameworks for AI systems where ground truth requires human judgment, including staged rollouts, A/B testing, and expert feedback loops.

Preferred Qualifications

• Experience with modeling tools such as R, scikit‑learn, Spark MLLib, MxNet, TensorFlow, NumPy, SciPy, etc.
• Experience building quantitative solutions as a scientist or science manager.
• Experience in one or more domains: access‑control systems, network security, application‑ and system‑development security, security architecture and models, cryptography, and operations security.
• Experience with terabyte‑scale stream processing and real‑time correlation of heterogeneous event sources.
• Experience with cost and latency optimization for LLM‑based systems (token reduction, schema optimization, deterministic offloading).
• Publications in applied ML, graph analytics, agentic AI, or security analytics.

Benefits

• Health insurance (medical, dental, vision, prescription).
• Basic Life & AD&D insurance and optional supplemental life plans.
• Employee Assistance Program, mental health support, and medical advice line.
• Flexible Spending Accounts.
• Adoption and surrogacy reimbursement coverage.
• 401(k) matching.
• Paid time off and parental leave.
• Sign‑on payments and restricted stock units (RSUs).

Pay

Base salary range: $167