Principal Software Engineer, Agentic Engineering

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
• What Differentiates This Role

Requirements

• 8-12+ years of software engineering experience with 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
• 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
• Open-source contributions to public GitHub projects
• Background in platform engineering, developer tooling, or infrastructure standards at enterprise scale
• Work Environment
• Hybrid work. Candidates must be located in the Farmington Hills / Metro Detroit, Michigan area. No remote candidates.
• Position not available for immigration sponsorship.
• Principal Software Engineer, Agentic Engineering
• LOCATION -- Farmington Hills, Michigan 48331-3552
• Attention search firms and staffing agencies: do not submit unsolicited resumes for this posting. Fifth Third does not accept resumes from any agency that does not have a

Benefits

Additional Information

Make banking a Fifth Third better® We connect great people to great opportunities. Are you ready to take the next step? Discover a career in banking at Fifth Third Bank. We are looking for a Principal Software Engineer to join our Agentic Engineering team. You will architect guardrail systems spanning multiple services and domains, establish standards for validation, enforcement, and observability, and anticipate misuse and system failure modes before they manifest. You will also set architectural direction for backend services, APIs, and integrations that apply software engineering discipline to govern how AI-driven systems behave across the engineering workflow. This is a senior technical leadership role requiring deep proficiency in Python and TypeScript, a track record of designing systems that operate reliably at organizational scale, and the ability to set standards that shape how enforcement is practiced across teams.

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