Chief Agentic Systems Architect

Our client is looking for a Chief Agentic Systems Architect to transform a 10+ year legacy codebase into a high‑velocity, agent‑operable architecture. 

This role sits at the intersection of software architecture, AI‑agent orchestration, and engineering governance. You will design system patterns, MCP interfaces, and cognitive context layers that allow LLMs and autonomous agents to safely refactor, test, and ship production code with minimal human intervention.
 

Responsibilities:

• Decompose legacy monoliths into agent‑readable, modular systems with strict boundaries and single responsibility
• Lead incremental modernization using the Strangler Pattern, wrapping legacy logic in modern, contract‑driven interfaces
• Architect and maintain the agent context layer: standardized Skills, Rules, and Commands for AI‑driven engineering workflows
• Build and operate Model Context Protocol (MCP) servers exposing legacy APIs, services, and databases as typed, secure, AI‑consumable tools
• Own contract‑first API design as the primary interface between human intent and autonomous agent execution
• Act as architectural gatekeeper for AI‑generated pull requests, ensuring scalability, security, and long‑term maintainability
• Mandate test‑driven development (TDD) and characterization testing to preserve legacy behavior during refactoring
• Monitor and optimize agentic reasoning loops to balance cost, speed, and architectural integrity

Requirements:

• 15+ years in software architecture, platform engineering, or technical leadership
• Deep hands‑on expertise with TypeScript, .NET, and Node.js
• Proven experience modernizing large, undocumented legacy systems
• Strong background in API design, distributed systems, and modular architectures
• Practical experience with agentic development, MCP, LLM tooling, or AI‑assisted engineering
• Bias toward clean code, deterministic systems, and production‑grade AI 

• Availability to work until 2 pm - 3pm US EST

   

Will be a plus:

• Experience with remote‑first or globally distributed teams
• Background in SaaS transformations, scale‑ups, or PE‑backed environments
• Comfort operating in high‑ambiguity, high‑ownership settings

Why this role matters:

• You are not adding AI features.
• You are designing the architectural substrate that allows AI to safely build software at scale.
• This is a career‑defining role for architects shaping how autonomous systems write, change, and govern production code.