Horizon3.ai

Applied AI Engineer I

Horizon3.ai

full-time

Posted on:

Origin:  • 🇺🇸 United States

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Job Level

Mid-LevelSenior

Tech Stack

AWSAzureCloudCyber SecurityDockerGoogle Cloud PlatformKubernetesLinuxNumpyPandasPythonPyTorchScikit-LearnTensorflow

About the role

  • Develop AI systems for vulnerability detection and autonomous security testing
  • Design and train reinforcement-learning and fine-tuning workflows (e.g., PPO, LoRA/QLoRA) to improve automated security agents
  • Automate security testing pipelines with Python and modern ML frameworks
  • Contribute to feature development from concept through deployment, including model evaluation and experiment tracking
  • Identify and document vulnerabilities in AI-native applications and LLM workflows
  • Research emerging AI security threats, prompt-injection tactics, and adversarial ML
  • Document findings and help build a technical knowledge base
  • Collaborate with experienced engineers and contribute to team mentorship and growth

Requirements

  • Bachelor’s degree in Computer Science, Machine Learning, Artificial Intelligence, Data Science, Software Engineering, Mathematics, Statistics, or a related field
  • Strong Python skills and comfort with data-science libraries (NumPy, pandas, scikit-learn)
  • Foundational knowledge of AI/ML concepts and frameworks (PyTorch, TensorFlow, or JAX)
  • Exposure to reinforcement learning or similar methods (deep Q-learning, PPO) through coursework, labs, or projects
  • Understanding of model training life cycle: data prep, feature engineering, and evaluation
  • Experience with Linux environments and Git version control
  • Interest in cybersecurity and ethical hacking
  • Strong problem-solving and clear communication skills
  • Must be located in or willing to relocate to the Indianapolis metropolitan area
  • Legal authorization to work in the United States / questions about sponsorship are required on application
  • Hands-on projects fine-tuning LLMs or training LoRA/QLoRA adapters (desired)
  • Experience with vector databases or retrieval-augmented generation (RAG) (desired)
  • Familiarity with AI security topics (model inversion, adversarial attacks) (desired)
  • Internship or academic work in reinforcement learning or autonomous agents (desired)
  • Contributions to open-source RL or adversarial-ML projects (desired)
  • Experience with Docker and containerized ML ops (Docker/Kubernetes) (desired)
  • Experience with cloud platforms (AWS, Azure, or GCP) (desired)
  • Security certifications (Security+, etc.) or active pursuit of them (desired)
  • Participation in CTF platforms (Hack The Box, TryHackMe, etc.) or AI/ML competitions (Kaggle) (desired)
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