Principal Software Engineer, Agentic Engineering

Fifth Third Bank • Farmington Hills, MI

1d • Hybrid

About The Position

Fifth Third Bank is seeking a Principal Software Engineer to join their Agentic Engineering team. This role involves architecting guardrail systems across multiple services and domains, establishing standards for validation, enforcement, and observability, and proactively identifying potential misuse and system failure modes. The engineer will also set the architectural direction for backend services, APIs, and integrations, applying software engineering discipline to govern the behavior of AI-driven systems throughout the engineering workflow. This is a senior technical leadership position that requires deep expertise in Python and TypeScript, a proven history of designing reliable systems at scale, and the ability to set organizational standards for enforcement practices.

Requirements

• 8–12+ years of software engineering experience
• Deep proficiency in Python and TypeScript
• Demonstrated experience architecting production systems that span multiple services and teams
• Track record of defining enforcement, validation, or safety standards adopted across an organization
• Experience designing systems that anticipate adversarial inputs, non-deterministic behavior, and edge case failures
• Ability to set architectural direction and establish reusable patterns for cross-team adoption
• Experience mentoring senior and lead engineers on system design, constraint modeling, and defensive architecture
• Strong written and verbal communication — able to present system-level strategy to engineering leadership
• Working experience with Terraform for AWS infrastructure at organizational scale
• Experience with agentic or multi-step workflow systems involving autonomous tool orchestration

Nice To Haves

• Experience designing LLM safety or guardrail systems end-to-end (not just integration)
• Track record of influencing engineering culture or establishing organization-wide technical standards
• Experience with agentic or multi-step workflow systems involving autonomous tool orchestration
• Open-source contributions to public GitHub projects
• Background in platform engineering, developer tooling, or infrastructure standards at enterprise scale

Responsibilities

• Architect guardrail and enforcement systems spanning multiple services, domains, and team boundaries
• Establish standards for validation, enforcement, observability, and safe execution across the platform
• Anticipate misuse and system failure modes and design preventive controls before incidents occur
• Set direction for shared backend services, APIs, and platform components at organizational scale
• Define reusable abstractions, enforcement patterns, and integration standards adopted organization-wide
• Influence engineering culture around defensive design, constraint modeling, and systems reliability

Benefits

• Comprehensive benefits
• Differentiated compensation offerings
• Incentive compensation plan
• Extensive benefits programs designed to support the individual needs of employees and their families, encompassing physical, financial, emotional and social well-being.

What This Job Offers

• Job Type: Full-time
• Career Level: Principal
• Education Level: No Education Listed