Senior Agentic Systems Architect – TypeScript, .NET, MCP

Work Life Group

. Transform a 10+ year legacy codebase into a high-velocity, agent-operable architecture .

Posted 10/24/2026full-timeRemote • MontenegroSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive expertise in modernizing legacy systems through architectural leadership, focusing on agentic development, API design, and modular architectures. Proficient in implementing SOLID principles and test-driven development to ensure high-quality, maintainable code.

Highest-signal resume keywords

Software ArchitectureTypeScriptAPI DesignTest-Driven DevelopmentAgentic Development

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Software ArchitectureTypeScriptNode.js.NETAPI DesignModular ArchitectureTest-Driven DevelopmentSOLID PrinciplesDependency InjectionHexagonal Architecture

Soft Skills

LeadershipCollaborationProblem-SolvingAdaptabilityCommunication

Tools & Technologies

MCPAI-Generated ToolsLLM ToolingContract-First API Design

Industry Keywords

Legacy SystemsSaaS TransformationsDistributed SystemsHigh-Ambiguity EnvironmentsPE-Backed Environments

Tech Stack

Tools & technologies

Distributed SystemsJavaScriptNode.jsTypeScript.NET

About the role

Key responsibilities & impact

Transform a 10+ year legacy codebase into a high-velocity, agent-operable architecture
Decompose legacy monoliths into agent-readable, modular systems with strict boundaries and single responsibility
Lead incremental modernization using the Strangler Pattern and modern contract-driven interfaces
Enforce SOLID principles, Dependency Injection, and Hexagonal Architecture
Architect and maintain the agent context layer with standardized Skills, Rules, and Commands
Build and operate MCP servers exposing legacy APIs, services, and databases as typed, secure, AI-consumable tools
Own contract-first API design between human intent and autonomous agent execution
Act as architectural gatekeeper for AI-generated pull requests
Mandate test-driven development and characterization testing during refactoring
Monitor and optimize agentic reasoning loops for cost, speed, and architectural integrity

Requirements

What you’ll need

7+ years in software architecture, platform engineering, or technical leadership
Proven experience modernizing large, undocumented legacy systems
Deep hands-on expertise with TypeScript, .NET, and Node.js
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
Experience with remote-first or globally distributed teams is nice to have
Background in SaaS transformations, scale-ups, or PE-backed environments is nice to have
Comfort operating in high-ambiguity, high-ownership settings
Experience with Strangler Pattern, SOLID principles, Dependency Injection, Hexagonal Architecture, Model Context Protocol, contract-first API design, TDD, and characterization testing

Benefits

Comp & perks

High ownership, flexibility and impact
Work across multiple products and technologies
Growth pathways across engineering, product and leadership
Remote-first work arrangement