Data Scientist, Agentic Systems

Crowdstrike; United States; On-site; USD 150,000 - 230,000; Full time

Job summary

CrowdStrike Inc. is seeking a Data Scientist to build next-generation agentic systems for cybersecurity. You will work where ML, big data, and security converge, training models, building AI agents, and evaluating them on proprietary data.

You will collaborate with cybersecurity SMEs to understand workflows, post-train LLMs with RL techniques, and prototype planning and memory-driven architectures. This role requires deep ML expertise and strong independent execution.

Qualifications

• Strong foundations in ML, probability and statistics with uncertainty handling.

Responsibilities

• Work at the intersection of AI and Threat Research.
• Collaborate with cybersecurity experts on analyst workflows.
• Post-train LLMs and agents with RLHF/RLAIF and PPO variants.
• Design AI agents and complex workflows with planning and memory.
• Prototype state-of-the-art agentic methods from literature.
• Establish objective benchmarks for agentic systems with rigorous evals.
• Optimize prompts and inference for model efficiency.
• Collaborate across Engineering, Data Science and Managed Services teams.
• Track AI field developments to identify research priorities.

Skills

Machine learning

Probability

Statistics

Experiment design

Python

PyTorch

Independent work

Education

PhD-level ML depth

Tools

PyTorch

Hugging Face Transformers

DeepSpeed

PEFT

vLLM

Job description

As a global leader in cybersecurity, CrowdStrike protects the people, processes and technologies that drive modern organizations. Since 2011, our mission hasn't changed - we're here to stop breaches, and we've redefined modern security with the world's most advanced AI-native platform. We work on large scale distributed systems, processing almost 3 trillion events per day and this traffic is growing daily. Our customers span all industries, and they count on CrowdStrike to keep their businesses running, their communities safe and their lives moving forward. We're proud to work for a mission-driven company leveraging AI to transform the way we work. CrowdStrikers drive their careers through flexibility and autonomy while also being expected to contribute to a culture of responsible AI adoption, experimentation, and innovation. We use an AI-first mindset as a force multiplier to proactively and continuously accelerate execution, build expertise, uncover insights, and solve complex problems. We're always looking to add talented CrowdStrikers to the team who have limitless passion, a relentless focus on innovation and a fanatical commitment to our customers, our community and each other. Ready to join a mission that matters? The future of cybersecurity starts with you.

About the Role:

The Data Science team is expanding and is looking for a Data Scientist to help build the next generation of agentic systems for cybersecurity. CrowdStrike's cybersecurity data is one-of-a-kind: we process nearly a trillion behavioral events per day. You'll work where Machine Learning, Big Data, and Cybersecurity converge - training models, building AI agents, and rigorously measuring whether they work - on data and problems you won't find anywhere else.

What You'll Do:

• Work at the intersection of Artificial Intelligence and Threat Research
• Work closely with subject-matter experts in cybersecurity to understand analyst workflows and their security operations procedures
• Post-train LLMs and agents - supervised fine-tuning and reinforcement learning (RLHF/RLAIF, PPO/GRPO/DPO, reward modeling) - to automate analyst procedures and improve reliability on real security tasks
• Devise AI agents and combine them into increasingly complex workflows: planning and reasoning loops, tool and function calling, and retrieval and memory
• Research new approaches to agentic planning, and prototype state-of-the-art methods from the literature
• Establish objective criteria for benchmarking agentic systems - evals, LLM-as-judge pipelines, and trajectory-level metrics, with real statistical rigor
• Optimize prompts and inference to get the most out of every model
• Collaborate and coordinate across Engineering, Data Science, and Managed Services teams, and partner with engineers to take prototypes toward production
• Keep track of developments in the field of Artificial Intelligence and help identify, define, and prioritize areas for research

What You'll Need:

• Excellent foundations in machine learning, probability, and statistics, with sound instincts for uncertainty, statistical skew/variance, and experimental design
• PhD-level depth of understanding in modern machine learning research -a doctorate itself is not required, but we expect equivalent mastery, including the ability to read, critique, implement, and improve upon current papers
• Experience training generative models, with a strong command of LLM training fundamentals (architecture, optimization, tokenization, data, and scaling behavior)
• Reinforcement learning / post-training as a core skill: RLHF/RLAIF, policy optimization (PPO/GRPO/DPO), reward modeling, and building RL environments for agents
• Experience building agentic systems: agent architectures (ReAct, planning, reflection), tool and function calling, and retrieval/memory/context management
• Experience with systematic prompt optimization, and with designing and building evals for LLM systems
• Fluency with GPUs, PyTorch, and the common LLM training and serving stack (e.g., Hugging Face Transformers/TRL/PEFT, DeepSpeed/FSDP, vLLM/TGI/SGLang)
• Strong, reproducible research engineering: clean Python and disciplined experiment tracking that your collaborators can build on
• Ability to work independently on ambiguous and complex objectives, and to communicate clearly within a large project team
• Proven experience utilizing AI technologies to enhance decision‑making, streamline workflows and processes, improve efficiency and drive business outcomes

Bonus Points:

• Experience generating training data and environments - synthetic data, agent trajectories/rollouts, and task simulators
• Familiarity with inference-time scaling / test-time compute (search, self-consistency, verifier-guided decoding, long chain-of-thought)
• Experience with agent safety and guardrails: sandboxing, abuse/jailbreak resistance, and reliability for autonomous systems
• A knack for interpretability and failure analysis - diagnosing why a model or agent fails, not just that it does
• Notable open-so