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Appian

Builds software that automates business processes

Lead AI Security Engineer

AI Application EngineeringConfirmed live in the last 24 hours
Full-timeMcLean, VA, USA

About the Job

Requirements

  • At least 4 years of professional software engineering experience, including at least 1.5 years building applications powered by large language models.
  • At least 5 years of programming experience with Python.
  • At least 2 years of experience deploying scalable and responsible AI solutions on cloud platforms such as AWS, Google Cloud, or Azure.
  • A strong foundation in software engineering and practical security domain knowledge.
  • A strong foundation in engineering and mathematics, with expertise in software and AI sufficient to design systems for autonomous triage and semantic correlation.
  • A bachelor's degree in Computer Science, AI, Electrical Engineering, Computer Engineering, or a related field plus at least 4 years of experience developing AI and machine learning algorithms or technologies; alternatively, a master's degree in a related field plus at least 2 years of that experience.
  • Hands-on experience building multi-agent or complex orchestration systems with tools such as LangChain, LlamaIndex, AutoGen, CrewAI, or Semantic Kernel is preferred.
  • Experience with production vector databases such as Pinecone, Qdrant, Milvus, or Weaviate for semantic chunking, embedding generation, and metadata filtering is preferred.
  • Experience interfacing with cybersecurity platforms through REST APIs or webhooks, such as Splunk, CrowdStrike, Microsoft Sentinel, or Palo Alto XSOAR, is preferred.
  • Experience deploying and scaling AI workloads in containerized cloud environments using AWS, Azure, or GCP and Kubernetes, EKS, or AKS is preferred.
  • Understanding of fine-tuning methodologies such as LoRA and QLoRA for smaller, domain-specific open-source models such as Llama 3 and Mistral, tailored for security log analysis, is preferred.

Responsibilities

  • Design, test, and deploy autonomous and semi-autonomous AI agents that integrate with enterprise security tools, including SIEM, EDR, XDR, and threat-intelligence feeds.
  • Translate traditional SOC playbooks and analyst workflows into deterministic and heuristic agentic pipelines using DAGs and multi-agent routing.
  • Design, optimize, and maintain production-grade retrieval-augmented generation workflows that add real-time security context, network topology, and historical incident logs to agent prompts.
  • Evaluate, benchmark, and optimize LLM performance, context-window utilization, latency, and cost efficiency across open-source and commercial models.
  • Collaborate with Tier 3 analysts and threat hunters to engineer human-in-the-loop handoffs so agents safely escalate complex anomalies to humans.
  • Implement security boundaries around the LLM architecture to mitigate prompt injection, data poisoning, and model tool abuse, and address the OWASP Top 10 for LLMs.

Desired Qualifications

  • Passion for staying current with AI research and security systems, and the ability to apply novel techniques judiciously in production.

About the Company

Appian

Builds software that automates business processes

Appian builds software that banks, insurers, government agencies and other heavily regulated organizations use to automate complex work, such as onboarding clients, settling claims and reviewing grant applications. In 2001, it built Army Knowledge Online, a web portal for US Army personnel that was then considered the world's largest intranet. Customers' developers build apps by connecting visual building blocks instead of writing much code, while a data fabric links records across their existing systems without migrating them and AI agents read documents and handle routine steps. Customers pay subscription fees, mostly for software that Appian runs in its own cloud. Appian was founded in 1999 and is based in McLean, Virginia.

Company size
1,001-5,000
Company stage
IPO
Headquarters
McLean, VA
Founded
1999

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