Sr Agentic AI Engineer

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*No Corp-to-corp / No Third-Party Agencies
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We're Hiring on behalf of our client for Lead Agentic AI Engineer
Location
: Hybrid Onsite near Fullerton, CA
Compensation
: 190,000 to 210,000 annual salary (DOE)
Terms
: Full-Time, Direct Hire
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Partnered with a client who is seeking Lead AI Developer to help shape the next generation of intelligent, production-grade AI inside a mission‑critical, on‑prem manufacturing platform. They're looking for a Sr. Agentic AI engineer who can own architecture, hands‑on development, and technical leadership as they embed advanced
agentic
capabilities, secure tool ecosystems, and reliable LLM integrations across Microsoft-based stack.
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What You'll Do

• Architect end‑to‑end AI capabilities within an on‑prem .NET environment.
• Build a robust agent runtime that handles tool execution, task state, routing, retries, and safe boundaries.
• Integrate with hosted LLM providers using modern tool/function-calling patterns and quality guardrails.
• Develop and maintain secure MCP-style tool servers for SQL, internal APIs, and file/report systems.
• Implement human‑in‑the‑loop controls, auditability, secrets management, and least‑privilege access patterns.
• Drive observability across logs, metrics, tracing, and dashboards.
• Establish testing strategies spanning unit, integration, failure simulation, and contract testing.
• Provide architectural direction, mentorship, reviews, documentation, and golden-path patterns for future AI dev work.
• Support deployments, troubleshooting, and alignment of AI capabilities with product priorities.

What You Bring

• 7+ years building distributed, production systems (Ideally, in .NET/C# services).
• 2 years with agentic AI architecture/integration experience in business environment (not only personal projects).
• Strong Microsoft SQL Server fundamentals (schema design, stored procedures, safe query practices).
• Experience integrating with LLM APIs and building production-grade agent/tool ecosystems.
• Skill in designing API/tool contracts (schemas, versioning, error handling, limits).
• Solid grounding in security: authZ/authN, least privilege, secrets, data minimization.
• Ability to lead architecture discussions and produce clear, actionable designs.
• Comfort working in Windows/on‑prem enterprise environments.

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*All qualified applicants will receive consideration for employment without regard to race, color, national origin, age, ancestry, religion, sex, sexual orientation, gender identity, gender expression, marital status, disability, medical condition, genetic information, pregnancy, or military or veteran status. We consider all qualified applicants, including those with criminal histories, in a manner consistent with state and local laws, including the California Fair Chance Act, City of Los Angeles' Fair Chance Initiative for Hiring Ordinance, and Los Angeles County Fair Chance Ordinance.*