Principal Software Engineer, Agentic Engineering

Fifth Third Bank, N.A. • Detroit, MI • 1h ago

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.

What You'll Do

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

This role is focused on how systems behave under misuse, failure, or unexpected inputs - not on building user-facing features. At this level, you are setting the standards that define how enforcement works across the organization. You anticipate problems that haven't happened yet, design the systems that prevent them, and establish the patterns that make safe behavior the default rather than the exception.

What You Will Bring

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

Nice to Have

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

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

At Fifth Third, we understand the importance of recognizing our employees for the role they play in improving the lives of our customers, communities and each other. Our Total Rewards include comprehensive benefits and differentiated compensation offerings to give each employee the opportunity to be their best every day.

The base salary for this position is reflective of the range of salary levels for all roles within this pay grade across the U.S. Individual salaries within this range will vary based on factors such as role, relevant skillset, relevant experience, education and geographic location. In addition to the base salary, this role is eligible to participate in an incentive compensation plan, with any such payment based upon company, line of business and/or individual performance.

Our extensive benefits programs are designed to support the individual needs of our employees and their families, encompassing physical, financial, emotional and social well-being. You can learn more about those programs on our 53.com Careers page at: https://www.53.com/content/fifth-third/en/careers/benefits.html or by consulting with your talent acquisition partner.

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 an active agreement with Fifth Third. Any unsolicited resumes - no matter how they are submitted - will be considered the property of Fifth Third and Fifth Third will not be responsible for any associated fee.

Fifth Third Bank, National Association is proud to have an engaged and inclusive culture and to promote and ensure equal employment opportunity in all employment decisions regardless of race, color, gender, national origin, religion, age, disability, sexual orientation, gender identity, military status, veteran status or any other legally protected status.

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